Double Stars - Recommendations

A detailed description of the project, the data sources, additional websites and how you can contribute visual observations and photographs of double stars to the project are summarized in our introduction.

Double Star Lists:
Double/Multiple Stars 612
Visual Observations 1703
Sketches 273
Photographs 28
Observers 16
Werner E. Celnik, Berthold Fuchs, Sarah Gebauer, Christopher Hay, Claus-Dieter Jahn, Gerd Kohler, Karsten Kopp, Winfried Kräling, Jens Leich, Stefan Loibl, Mark McCarthy, René Merting, Uwe Pilz, Jörg S. Schlimmer, Frederik Wanink, Robert Zebahl
m1 m2 ρ θ Year Coordinates (J2000)
★★★ STTA254, WZ Cas AB 7m4 8m3 57.8'' 89° 2018 Cas 00h01m15.85s +60°21'19.00"
AC 7m4 9m6 155.4'' 324° 2015
AD 7m4 10m3 181.4'' 118° 2016
Christopher Hay
Seeheim (Germany)
6x24 AB: Clearly split. A definitely brighter than B. Under a NELM 5m5 sky both components appear weak in these mini-binoculars and no colour impression arises.;
WZ Cas is the variable designation of component A of STTA254. This semiregular carbon star has a mean brightness range of 6m8 to 7m7, and can reach extreme values of 6m3 at one end and 8m8 at the other. Perhaps it was too deep in a minimum at the time of observation to show colour with 1 inch of aperture? 15x45 binoculars revealed colour in this night, see observation below.
Christopher Hay
Seeheim (Germany)
15x45 AB: Wide split. A orange-red, B no particular colour. NELM 5m5, same night as 6x24 observation above.
Robert Zebahl
Leipzig (Germany)
16x70 AB: 2020-08-19: Intense orange & bluish. Very striking.
René Merting
Drachhausen (Germany)
16x70 AB: ein schöner Fernglas-Doppelstern - Komponente A im Westen präsentiert sich dunkelgelb (noch nicht orange), B im Osten ist eher weißlich
René Merting
Drachhausen (Germany)
18x70 AB: ein sehr auffälliger Doppelstern mit einem schönen Farbkontrast - A strahlt gelb, das kurz davor steht, ins Orange über zu gleiten - B wirkt im Kontrast aquamarin, so dezent wie eine typische PN-Farbe
Robert Zebahl
Leipzig (Germany)
80mm (33x) AB: Nice double star. Brighter component appeared orange, the fainter more bluish.
René Merting
Drachhausen (Germany)
100mm (20x) AB: 20x reicht zwar schon für eine klare Trennung, aber Komponente B im Osten ist nur dumpf grau-blau und noch zu schwach für den schönen Farbkontrast, der sich bei 32x offenbart - Komponente A strahlt dann in einem satten Bernsteingelb, B im Osten gibt sich unterkühlt bläulich - Helligkeitsunterschied 1 bis 1.5 Größenklassen, schwierig abschätzbar wegen der Farben
Robert Zebahl
Leipzig (Germany)
102mm (28x) AB: Splendid view. Primary component clearly orange, secondary blue. ../projects/double-stars/robert-zebahl/sketches/2019-08-22_wz_cas.jpg
Jörg S. Schlimmer
Germany
127mm (136x) Sehr schöner Farbkontrast ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_WZ_Cas_filtered_96dpi.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: WZ Cas: Pretty, deep orange A and very wide half delta mag B, white.
René Merting
Drachhausen (Germany)
320mm (45x) AB: bei 45x ein weit getrenntes Pärchen mit wunderschönen Farbkontrast, Komponente A im Westen ist grell-orange und die gut 1.5 Magnituden schwächere Komponente B ist aquamarin-grau
Robert Zebahl
Leipzig (Germany)
102mm ../projects/double-stars/robert-zebahl/photographs/2019-07-16_wz_cas.jpg
GIC2 AB 7m8 11m5 29.7'' 236° 2018 Peg 00h09m15.74s +25°16'55.00"
Mark McCarthy
Fremont (California/USA)
317mm (277x) New designation to me: Harry Giclas, Lowell proper motion survey -- the man who hired Robert Burnham! Faint yellow-orange star with fainter and very wide companion. Possible 3rd to make a triangle. (AB seen, 4 stars in system)
STF2 6m7 6m9 0.9'' 15° 2019 Cep 00h09m20.18s +79°42'52.40"

../images/binary-star-orbits/STF2-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (198x) Schneemann-Figur. Abstand 0“91 ../projects/double-stars/uwe-pilz/sketches/STF2.jpg
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF2.jpg
STF12, 35 Psc 6m1 7m5 11.2'' 148° 2019 Psc 00h14m58.84s +08°49'15.50"
Robert Zebahl
Leipzig (Germany)
70mm (22x) At 22x pretty bright but uneven pair with relatively close components. At 44x the brighter component looked slightly yellowish, the fainter one slightly bluish. The double star could be observed together with STF22 (38 Psc) in the same field of view and stands in nice contrast to it.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow and white, ~1 delta mag, PA to S.
★★ HJ1947 AB 6m2 9m8 9.1'' 75° 2015 And 00h16m21.50s +43°35'42.40"
René Merting
Drachhausen (Germany)
100mm (64x) bei 64x ist Komponente B sehr schwach östlich von A erkennbar - großer Helligkeitsunterschied, kaum abschätzbar, vielleicht 3-4 Größenklassen - schönes Doppel-Doppel zusammen mit STT5 nur 28' östlich - beide Paare haben in etwa die gleichen Helligkeiten und den gleichen Abstand, nur die Positionswinkel sind verschieden - A strahlt weißgelblich
BU392 5m7 12m5 19.5'' 71° 2007 Cas 00h16m57.05s +61°31'59.50"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow A star. 12th mag B swims into view with averted vision and seeing, then can hold it direct as a bluish point.
STF22, 38 Psc AB-C 7m1 7m7 3.9'' 234° 2020 Psc 00h17m24.50s +08°52'34.80"
AB-D 7m1 11m5 66.8'' 151° 2005
Robert Zebahl
Leipzig (Germany)
70mm (44x) AB-C: At 44x separated with almost touching diffraction disks and small difference in brightness. At 57x clearly separated, but still quite close together. It stands in beautiful contrast to the nearby double star STF12 (35 Psc).
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB-C: near equal white pair, well split, B ~1/2 delta mag, PA to SW.
ES41 8m0 11m2 6.3'' 220° 2015 Cas 00h18m21.55s +49°30'35.10"
Mark McCarthy
Fremont (California/USA)
317mm (553x) B appeared while putting my eye to the eyepiece -- then disappeared. B needs averted vision to see -- can barely hold it direct vision. Wide, 4 delta mag.
★★ STT5, 26 And 6m1 10m1 6.1'' 240° 2016 And 00h18m42.15s +43°47'28.10"
René Merting
Drachhausen (Germany)
100mm (64x) Komponente B erscheint bei 64x knapp westlich von A und ist nur knapp sichtbar - extrem großer Helligkeitsunterschied - schönes Doppel-Doppel zusammen mit HJ1947 nur 28' weiter westlich, beide Paare haben in etwa die gleichen Helligkeiten und den gleichen Abstand, nur die Positionswinkel sind verschieden
AC1 7m3 8m3 1.9'' 291° 2020 And 00h20m54.10s +32°58'40.90"

../images/binary-star-orbits/AC1-orbit.jpg

Robert Zebahl
Leipzig (Germany)
102mm (125x) Very attractive, relatively close with a clearly visible difference in brightness. In the immediate vicinity a brighter star shines in a lovely orange. Very nice contrast! ../projects/double-stars/robert-zebahl/sketches/2019-10-22_ac1.jpg
Uwe Pilz
Leipzig (Germany)
105mm (200x) orange. Leuchtend gelber Stern in 5' Abstand ../projects/double-stars/uwe-pilz/sketches/191122AC1.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Tight yellow-white pair, near equal magnitudes.
BU1095, 28 And AB 5m2 13m1 2.0'' 16° 2008 And 00h30m07.34s +29°45'06.10"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very bright yellow- white A. B is a very faint but consistent point resolved just beyond the first diffraction ring when seeing stills.
BU394 AB 8m5 8m8 0.8'' 278° 2017 Cas 00h30m45.56s +47°31'47.50"

../images/binary-star-orbits/BU394-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Very fine, pop split with seeing, near equal.
BU1227 AB 7m2 10m6 2.8'' 193° 2015 Cas 00h32m21.78s +58°20'19.10"
AC 7m2 11m8 22.4'' 80° 2015
AD 7m2 11m7 30.9'' 112° 2015
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Yellow and 3 delta mag B, orange, comes into view direct vision but only with seeing, 2-3".
Mark McCarthy
Fremont (California/USA)
317mm (553x) AC: Faint star, 1 delta mag fainter than B, widely separated, PA 90 degrees from AD
Mark McCarthy
Fremont (California/USA)
317mm (553x) AD: Faint star, 1 delta mag fainter than B, more widely separated than C, at 90 degrees PA from C
★★★ eta Cas, 24 Cas STF60 AB 3m5 7m4 13.4'' 326° 2019 Cas 00h49m06.29s +57°48'54.70"
STF60 AC 3m5 11m4 225.0'' 260° 2000
STF60 AD 3m5 12m8 189.4'' 354° 2011
STF60 AE 3m5 10m2 75.6'' 126° 2015
STF60 AF 3m5 11m5 378.3'' 276° 2000
STF60 AG 3m5 9m5 419.7'' 259° 2012
STF60 AH 3m5 8m4 701.1'' 355° 2012
SMR2 AI 3m5 11m6 90.3'' 73° 2012
SMR2 AJ 3m5 12m3 237.1'' 262° 2012

../images/binary-star-orbits/STF60-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (57x) AB: Easy to split with big difference in brightness. Fainter component appeared deep orange to slightly red colored, brighter component tends to be more slightly yellowish.
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x ist Komponente A so hell, dass B trotz des augenscheinlich großen Abstandes von 13,4" nur knapp getrennt zu sehen ist - Komponente A ist gleißend hell-gelb, B dürfte mindestens 3 Größenklassen schwächer sein und wirkt dadurch dumpfer
Uwe Pilz
Leipzig (Germany)
105mm (53x) AB: leicht
Uwe Pilz
Leipzig (Germany)
105mm (288x) kein Sternentstehungsgebiet! ../projects/double-stars/uwe-pilz/sketches/etaCas.jpg
Sarah Gebauer
Germany
150mm (54x) AB: bei 54x erst nur einen Stern gesehen, doch da, ganz schwach darunter doch die wesentlich schwächere, zweite Komponente entdeckt ../projects/double-stars/sarah-gebauer/sketches/20200731%20Eta%20Cas%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Nice yellow pair. A is a red tainted yellow, B is cleaner.
René Merting
Drachhausen (Germany)
320mm (72x) AB: bei 72x ein echt fetter Farbkontrast, Komponente A ist gleißend hell und zitronengelb, B zeigt sich knallig orange - beide Sterne sind gut getrennt voneinander zu beobachten - sehenswert
65 Psc, STF61 6m3 6m3 4.4'' 115° 2020 Psc 00h49m52.88s +27°42'38.90"
Mark McCarthy
Fremont (California/USA)
317mm (277x) Bright orange pair, 6-7"
BU232 AB 8m5 8m8 0.9'' 256° 2018 Cas 00h50m25.10s +50°37'49.60"
AB-C 8m5 10m1 24.5'' 300° 2018

../images/binary-star-orbits/BU232-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (533x) AB: Nice, well split, near equal. Part of a triple, the next one much wider in same PA and two delta mag. [AB-C is 10.06 24.5"]
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Neat near equal orange and yellow. Split with seeing, 1".
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB-C: C 2 delta mag fainter than B, about 25" separated, is the +1 star with BU232AB
MLR27 10m2 10m2 0.5'' 212° 2008 Cas 00h51m10.71s +60°18'54.20"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Split with seeing, tremulous in turbulence but does split when settled. Noticeable delta mag.
STF65 8m0 8m0 3.2'' 221° 2020 Cas 00h52m45.61s +68°51'59.30"
Robert Zebahl
Leipzig (Germany)
70mm (57x) Clearly split with equally bright components.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Equal pair, white-yellow. Wide and pretty bright
★★ BU1 AB 8m6 9m3 1.5'' 83° 2016 Cas 00h52m49.22s +56°37'39.50"
AC 8m6 8m9 3.9'' 134° 2020
AD 8m6 9m7 8.9'' 195° 2020
AE 8m6 12m1 15.8'' 333° 2015
CD 8m9 9m7 7.8'' 220° 2020
Robert Zebahl
Leipzig (Germany)
70mm (57x) AC: Easy to split with little difference in brightness.
Robert Zebahl
Leipzig (Germany)
70mm (57x) AD: Relatively large angular distance with obviously fainter component.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: In the finder there is a right triangle of equal stars, the foot star has a very faint, 2-3 delta mag star very close ~1", faint split. Some fainter stars wreathed about it. AC and AD appear to be the other triangle stars. 17 stars visible in the system, which I suppose ought to be called an open cluster
A1258 9m7 9m9 0.6'' 202° 2018 Cas 00h54m23.37s +54°31'41.00"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Yes! I got it split, what a sight! Suspected at 533x. Reddish A, 1 delta mag brighter than blue B. Perfect star images. Nice color pair
HU802 7m8 10m0 0.4'' 222° 2008 Cas 00h54m53.84s +49°24'18.90"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Hairline split to overlapping, 1 delta mag, super fine
★★ STF73, 36 And AB 6m1 6m5 1.2'' 338° 2019 And 00h54m58.02s +23°37'42.40"
Sarah Gebauer
Germany
100mm (136x) beide Sterne tanzen wild umeinander herum, blickweise ist er kurz getrennt
Robert Zebahl
Leipzig (Germany)
102mm (125x) Clearly visible as figure '8' with a rather small difference in brightness.
Uwe Pilz
Leipzig (Germany)
105mm (198x) ganz einfach
Uwe Pilz
Leipzig (Germany)
105mm (240x) gelb und weiß ../projects/double-stars/uwe-pilz/sketches/20120336And.jpg
Robert Zebahl
Leipzig (Germany)
152mm (300x) Split with little gap in between and little difference in brightness. Seeing was not really good.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) hell ../projects/double-stars/frederik-wanink/sketches/36And.jpg
TDS1665 10m5 10m5 0.5'' 30° 2015 Cas 00h55m08.24s +57°13'30.80"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Can tell is double, elongated, and I got one split in ten seconds, seeing needs to be perfect
TDS1670 11m6 11m6 0.7'' 26° 2015 Cas 00h55m57.82s +58°32'38.90"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Rather wide, well split with seeing, bluish stars due to faintness. Very nice pair
MAD1 7m7 9m1 0.8'' 2015 And 01h00m35.58s +47°19'14.60"

../images/binary-star-orbits/MAD1-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (533x) Exceptionally fine split with 333x, obvious with 533x, getting really nice airy disks. ~2 delta mag, <1", pale yellow A and very light green B. Physical pair with a 925 year period.
ES45 6m6 10m8 7.9'' 244° 2015 Cas 01h01m27.04s +49°32'39.10"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange-yellow A, need averted vision to flash B out, barely hold with direct vision.
A2901 7m1 7m8 0.4'' 64° 2018 Cas 01h01m30.15s +69°21'30.70"

../images/binary-star-orbits/A2901-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (885x) Elongated to notched with seeing
BU396 6m1 8m6 1.3'' 67° 2007 Cas 01h03m37.01s +61°04'29.40"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Suspected in 277x, confirmed split with 553x, Small much fainter blue B in A's diffraction -- yellow-white, ~1", ~3 delta mag.
★★ STF88, psi 1 Psc, 74 Psc AB 5m3 5m5 29.8'' 159° 2018 Psc 01h05m40.93s +21°28'23.60"
AC 5m3 10m7 90.4'' 124° 2017
BC 5m5 10m7 68.5'' 109° 2017
Christopher Hay
Seeheim (Germany)
7x45 AB: Very tight but definitely split, binoculars handheld. Component A is very slightly brighter than B.
Robert Zebahl
Leipzig (Germany)
8x44 AB: 2020-11-25: Beautiful! Very nicely separated with little difference in brightness. White-yellowish & white-bluish. Separable even without using a tripod, but difficult.
René Merting
Drachhausen (Germany)
10x50 AB: ein etwas mehr als knapp getrenntes Pärchen zweier gleichheller Sterne
Christopher Hay
Seeheim (Germany)
15x45 AB: Well split, binoculars with internal stabilisation. Component A appears at first to be more orange than component B, but after about ten seconds the orange impression flips to component B, and from there on goes back and forth. Visited Psi1 Psc several times, taking breaks of a few minutes in-between, and each time the same effect occurred, with A initially appearing to be on the orange side.
René Merting
Drachhausen (Germany)
16x70 AB: ein ordentlich getrenntes helles Sternpaar, die südliche B-Komponente wirkt etwas weniger weiß - schöner Anblick
Christopher Hay
Seeheim (Germany)
18x80 AB: Psi1 Psc is well separated. Very strong visual presence in this instrument. Components almost identically bright, colourless. Strongly supplemented to the south in 4° field of view by Psi2, Psi3 and Chi. Field relatively empty to the north, which gives the field further tension. According to Stelledoppie a true physical double 275 light years distant.
AC13 AB 8m1 9m5 0.6'' 265° 2018 And 01h08m53.15s +45°12'26.90"
Mark McCarthy
Fremont (California/USA)
508mm (533x) ! AB is paired with a widely separated 11th magnitude C star forming HJ 2018. A splits beautifully at 533x, ~0.5", nearly 2 delta mag.
BU235 Aa-Ab 7m5 7m8 0.8'' 143° 2018 Cas 01h10m34.31s +51°00'47.80"

../images/binary-star-orbits/BU235-Aa-Ab-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) Mehrfachsystem ../projects/double-stars/frederik-wanink/sketches/BU235.jpg
Mark McCarthy
Fremont (California/USA)
508mm (333x) Amazing system with five faint pairings, but the main attraction is Aa-Ab, near equal bright A, hairline at 205x and and a nice clean split at 333x, light yellow stars, slight magnitude difference. Seeing giving me nice round disks. Terrific. Physical pair with a 278 year period. Amazingly, Burnham discovered this with his 6-inch
STF96 7m9 8m9 0.9'' 287° 2018 Cas 01h12m41.24s +65°00'32.90"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) scheint enger als 0,9" ../projects/double-stars/frederik-wanink/sketches/STF96.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Mostly notched but moments of hairline split with seeing 1.5 delta mag. Very tough! Yellow-orange stars.
BU258 AB 6m5 8m8 1.6'' 263° 2015 Cas 01h13m09.82s +61°42'22.30"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Barely split at 340x, a brightening in the first diffraction. Wanted more certainty so went to 553x, clean split, 2" 3 detla mag.
★★ zeta Psc, 86 Psc, STF100 AB 5m2 6m3 22.8'' 63° 2018 Psc 01h13m43.80s +07°34'31.80"
Christopher Hay
Seeheim (Germany)
7x50 On tripod. Fine split with a sliver of black between the components. No particular colour.
Christopher Hay
Seeheim (Germany)
15x45 Cleanly split. Western component distinctly brighter, no colour impression.
Christopher Hay
Seeheim (Germany)
180mm (110x) Despite the wide separation the pair holds together visually very strongly, and dominates the FOV. And indeed, Stelledoppie states it is a true physical pair at 174 light years from us. Component A is ice-blue. I probably wouldn't have any strong colour impression coming across component B on its own, but standing next to A it seems a washed-out orange.
Robert Zebahl
Leipzig (Germany)
200mm (37x) Visually evident as double star and easy to find. Well split with slight difference in brightness.
S397, 35 Cas AB 6m3 8m6 57.4'' 342° 2018 Cas 01h21m05.27s +64°39'29.30"
René Merting
Drachhausen (Germany)
16x70 ein weit getrenntes Pärchen mit einem schönen Farbkontrast - Komponente A im Süden wirkt blau-weiß, B ist gut 1.5 Größenklassen schwächer und wirkt gräulich
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x ein schönes helles Sternpaar, weit getrennt - auffälliger Farbkontrast, A ist reinweiß, B eher schmutzig orange-braun - zurück auf 20x ist die Trennung noch immer sehr deutlich
STF115 AB 7m1 7m3 0.5'' 160° 2018 Cas 01h23m21.27s +58°08'35.60"

../images/binary-star-orbits/STF115-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Peanut, near equal. in nearly the same FOV with Detla Cas, V 465 pretty orange star, and NGC 457, a loose moderately rich open cluster
Mark McCarthy
Fremont (California/USA)
508mm (533x) Wonderful split, more than hairline, white stars, near equal. Nice airy disks. Physical with 222 year period, Struve discovered at 0.7" approaching apastron
STTA17 & BKO10 STTA17 AB 8m0 9m8 35.4'' 101° 2015 And 01h24m30.85s +39°01'30.30"
STTA17 AC 8m0 8m5 134.9'' 347° 2014
STTA17 CD 8m5 9m8 68.9'' 279° 2015
STTA17 CE 8m5 13m3 81.2'' 14° 2015
BKO10 AF 8m0 11m2 141.7'' 270° 2015
Christopher Hay
Seeheim (Germany)
18x80 The group of stars strikes the eye while sweeping from Mirach to Tau/Upsilon TRI. First thought I'd found an open cluster. Two pairs with practically opposite PAs. Southern pair AB much closer than northern CD, but brightnesses within the pairs very similar. A nice double-double.
Robert Zebahl
Leipzig (Germany)
152mm (22x) The components A-D and F easily visible as a rather conspicuous group with comparatively large distances. I didn't pay attention to the component E. No brighter stars in the immediate vicinity. The pair AB and CD are very similar; CD a bit wider with opposite position angle. Very nice multiple star also for smaller telescopes.
René Merting
Drachhausen (Germany)
320mm (72x) AB: bei 72x weit getrennt - A im Westen wirkt gelblich, B ist gut 1.5 Größenklassen schwächer und erscheint grau
CD: bei 72x sind diese beiden Compañeros ebenfalls mit etwas mehr Abstand im Norden erkennbar, sie stehen beide etwas weiter auseinander als AB - das Gesamtbild wirkt wie ein verzogenes, längliches Parallelogramm
★★★ S398 AB 6m3 8m0 68.9'' 100° 2018 Psc 01h28m22.92s +07°57'40.90"
Christopher Hay
Seeheim (Germany)
7x50 On tripod. Wide split. A orange-red, B a tiny pinprick of light. Attractive sight in 7.3° field of view, with Zeta Psc neatly on western edge of FOV.
Physical double according to Stelledoppie.
Three-star rating awarded because this is a physical double that can be resolved at 7x, while dominating the field of view with more power and presenting a strong colour contrast with more aperture (see 20x80 observation below). As an added bonus, S398 is just half a degree south of the ecliptic and is thus visited regularly by planets and the moon.
Christopher Hay
Seeheim (Germany)
20x80 Wide split. A reddish-white, B blue-white. Very strong visual presence with no competition in 2.5° field of view, accentuated nicely by 6-mag 96 Psc about 2/3° to the south.
Mark McCarthy
Fremont (California/USA)
317mm (553x) orange with 1 delta mag white to east.
STT33 & DOB2 STT33 AB 7m3 9m0 26.9'' 77° 2015 Cas 01h37m22.87s +58°38'14.70"
DOB2 AC 7m3 10m3 107.0'' 109° 2015
René Merting
Drachhausen (Germany)
16x70 STT33 (AB): ein isoliert stehendes gut getrenntes Pärchen mit schönem Farbkontrast - Komponente B im Osten wirkt rot-braun, weil die weiße Komponente A gut 1.5 Größenklassen heller ist
René Merting
Drachhausen (Germany)
100mm (20x) STT33 (AB): bei 32x stehen beide Komponenten weit auseinander - Komponente B im Osten ist gut 1.5 Größenklassen schwächer als A - Farbkontrast rein weiß (A) vs. orange-braun (B) - südöstlich von A in 4-facher Entfernung AB steht ein weiterer schwacher Stern (Komponente C mit 10.29 mag/ AC mit eigener Bezeichnung: DOB 2) - zurück auf 20x bilden A und B ein schönes enges Paar, Komponente C ist auch noch knapp erkennbar
René Merting
Drachhausen (Germany)
100mm (32x) DOB2 (AC): Komponente C als Anhängsel von STT33 - Komponente C ist bei 32x sehr weit südöstlich von A erkennbar, vierfacher Abstand AB (STT33) - zurück auf 20x sind alle drei Komponenten ebenfalls noch zu erkennen
Mark McCarthy
Fremont (California/USA)
317mm (340x) STT33 (AB): Pretty yellow-white and red-orange pair, wide, 1.5-2 delta mag. Nearby X Cas a very pretty red.
BU1103, 44 Cas AB 5m8 12m1 1.6'' 2005 Cas 01h43m19.75s +60°33'04.80"
Mark McCarthy
Fremont (California/USA)
317mm (553x) 44 Cas. Extremely fine, extremely faint spec consistently in one spot in the diffraction, 1", when seeing perfects. Need a slight averted vision to see it.
STF154 8m6 8m8 5.2'' 127° 2016 And 01h45m02.50s +43°42'22.80"
Robert Zebahl
Leipzig (Germany)
102mm (62x) 2020-11-02: At 28x clearly elongated, at 62x very finely separated with similar bright components. Pale orange & pale blue. At 125x similar color impression.
Uwe Pilz
Leipzig (Germany)
120mm (128x) ../projects/double-stars/uwe-pilz/sketches/201104STF154.jpg
★★ 1 Ari, STF174 6m3 7m2 2.9'' 164° 2018 Ari 01h50m08.60s +22°16'29.50"
Robert Zebahl
Leipzig (Germany)
63mm (46x) Clearly split, but tight with noticeable difference in brightness.
Robert Zebahl
Leipzig (Germany)
70mm (80x) At 67x pretty tight pair, but separated with a clear difference in brightness. The primary component appeared in a hint of orange. At 80x easy to separate.
Christopher Hay
Seeheim (Germany)
76mm (83x) 1 Arietis is clearly orange (not split) in 12x42 finder. In 3-inch at 83x fine split, primary fiery orange. At 100x split becomes more obvious, at 125x easy, but at expense of loss of colour.
Stefan Loibl
Rosenheim (Germany)
102mm (102x) slight color difference, A orange, B blueish
Sarah Gebauer
Germany
150mm (27x) im Dezember 2019 nicht getrennt ../projects/double-stars/sarah-gebauer/sketches/20191230%201%20Ari%20DSk.jpg
Robert Zebahl
Leipzig (Germany)
200mm (100x) Conditions in the target region: SQM-L 20.8
Nice double star with big difference in brightness.
Mark McCarthy
Fremont (California/USA)
203mm (533x) 1 Ari. ! Very beautiful yellow-orange A and robin's egg blue B, 3", one delta mag. probably one of the best color pairs
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty orange and blue pair, ~2 delta mag, ~2".
Karsten Kopp
Köln (Germany)
600mm (180x) Gut zu trennender Doppelstern mit schon auffälligem Helligkeitsunterschied. Der hellere leuchtet gelblich und der schwächere geht ins bläuliche. Schöner Doppelstern.
STF179 7m6 8m1 3.5'' 160° 2018 And 01h53m10.72s +37°19'16.30"
Robert Zebahl
Leipzig (Germany)
102mm (62x) 2020-11-02: At 62x very nice sight! Finely separated pair of almost equally bright components. At 125x a small difference in brightness is visible. Pale orange & slightly bluish.
Uwe Pilz
Leipzig (Germany)
120mm (150x) ../projects/double-stars/uwe-pilz/sketches/201104stf179.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal magnitude, 4", nice orange-yellow color.
★★ gamma Ari, STF180 AB 4m5 4m6 7.4'' 2020 Ari 01h53m31.76s +19°17'38.60"
Christopher Hay
Seeheim (Germany)
15x60 In brief moments definitely split with a hair's breadth of black in-between. The rest of the time tantalisingly close to popping apart. Brightness difference distinct enough at all times to identify the southern star as the A component. Both components pure white.\A physical pair 164 light years distant from us. Also known in ancient times as the "First Star in Aries", as it was closest then to the vernal equinoctial point on the ecliptic
Christopher Hay
Seeheim (Germany)
42mm (12x) Clearly elongated, slightly notched in middle.
Christopher Hay
Seeheim (Germany)
76mm (83x) A strong matched pair. Both white. 1st diffraction rings just touching.
Stefan Loibl
Rosenheim (Germany)
102mm (41x) easily split at 41x, no color difference, nice view with 8m star HD11557 in the same FOV
Robert Zebahl
Leipzig (Germany)
200mm (80x) Nice, obvious double star. Both components have similar brightness and appeared white.
Mark McCarthy
Fremont (California/USA)
203mm (533x) Gamma Arietis = Mesarthim: Perfectly equal pair, wide, very white
Mark McCarthy
Fremont (California/USA)
317mm (277x) Gamma Ari. Equal yellow-white, wide, bright.
Karsten Kopp
Köln (Germany)
600mm (180x) Einfacher Doppelstern, mit fast identischer Helligkeit.
COU453 10m4 10m8 0.7'' 282° 2016 Ari 01h56m19.96s +25°20'24.00"
Mark McCarthy
Fremont (California/USA)
508mm (533x) I get clean split, the B star is very faint and just within A's diffraction ring, but it's there. Great!
STF182 AB 8m3 8m3 3.6'' 125° 2016 Cas 01h56m23.56s +61°16'52.00"
Robert Zebahl
Leipzig (Germany)
70mm (57x) At 44x almost split. At 57x equally bright components visible.
A1920 9m5 10m1 1.8'' 236° 2018 Tri 01h57m52.62s +33°10'19.60"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Nice clean split, very pretty white stars, seems a bit more than half delta mag
Karsten Kopp
Köln (Germany)
600mm (257x) Doppelstern war nur sehr knapp zu trennen. Der Helligkeitsunterschied liegt bei knapp 1,5 mag, eventuell auch leicht mehr.
★★ H5 12, 9 Ari, lambda Ari AB 4m8 6m7 37.3'' 48° 2019 Ari 01h57m55.71s +23°35'45.80"
Robert Zebahl
Leipzig (Germany)
8x44 2020-11-25: Easily separable with noticeable difference in brightness. Primary component appeared slightly yellowish with dim companion.
Robert Zebahl
Leipzig (Germany)
70mm (15x) Easy to split with large distance and difference in brightness.
Stefan Loibl
Rosenheim (Germany)
102mm (41x) easily split, both components white, no color difference
Uwe Pilz
Leipzig (Germany)
105mm (200x) der helle Stern ist blauweiß ../projects/double-stars/uwe-pilz/sketches/191025_LamAri.jpg
Christopher Hay
Seeheim (Germany)
180mm (113x) AB: A strong pair dominating the 0.6° field of view. B presents a weak ochre colour tone, in charming contrast to pearly-white component A.
According to Stelledoppie a physical pair at a distance to us of 129 light years.
★★ STF201, eps Tri 5m5 11m4 4.2'' 119° 1990 Tri 02h02m57.97s +33°17'02.90"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Epsilon Tri. Very nice! Bright A star is a white blaze, and outside of its glow is very small point of the B star, very fine. Very nice indeed
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern ist an sich gut zu trennen, hier liegt der große Reiz in dem Helligkeitsunterschied von knapp 6 mag. Der helle Stern erstrahlt bläulich weiß.
STF208, 10 Ari AB 5m8 7m9 1.3'' 349° 2018 Ari 02h03m39.26s +25°56'07.60"

../images/binary-star-orbits/STF208-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (200x) helle Stelle im ersten Ring ../projects/double-stars/uwe-pilz/sketches/10Ari.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) ~2 delta mag, ~1" very nice. ~1 disk split. Nice!
★★★ gamma And, 57 And, Alamak STF205 A-BC 2m3 5m0 9.6'' 63° 2019 And 02h03m53.92s +42°19'47.50"
STT38 BC 5m3 6m5 0.2'' 96° 2010
BAR22 AD 2m3 15m0 27.9'' 245° 1898

../images/binary-star-orbits/STT38-BC-orbit.jpg

Robert Zebahl
Leipzig (Germany)
63mm (42x) A-BC: Easy to split with quite large difference in brightness.
Christopher Hay
Seeheim (Germany)
71mm (32x) Fine split. A is mandarine orange. BC has trouble displaying its colour due to the overpowering light of A, but in good moments is clearly blue.
A-BC is a physical double at a distance to us of 393 light years.
BC is also physical, with a relatively short period of 63 years for C to circle B and a very tight periastron. Unobservable in 2013 at periastron with 0.1". Since then the angular separation has been widening rapidly and will reach 0.4" in 2029. B-C will then become observable in large amateur telescopes for three decades, after which C will fall quickly back to B.
Uwe Pilz
Leipzig (Germany)
105mm (52x) A-BC: einfach
Uwe Pilz
Leipzig (Germany)
120mm (128x) A-BC ../projects/double-stars/uwe-pilz/sketches/201105GammaAnd.jpg
Robert Zebahl
Leipzig (Germany)
152mm (100x) A-BC: Very easy. A: orange, BC: rather white.
Christopher Hay
Seeheim (Germany)
180mm (110x) A very strong pair in 0.6° FOV with powerful colour contrast, A yellow, BC ice blue.
René Merting
Drachhausen (Germany)
320mm (45x) A-BC: bei 45x ein knapp getrenntes Pärchen - Komponente A knallgelb mit einem Anhängsel nordöstlich - Komponente BC strahlt 3 Größenklassen schwächer - bei 144x wirkt BC grün-weiß, bei 45x war der Eindruck noch leicht gelblich
Mark McCarthy
Fremont (California/USA)
508mm (667x) BC: Component of STF 205, of which A is a brilliant orange and BC bright blue. In BC I can only see elongation through the speckle at 667x and 1067x. Short 62.63 year period which will get "easier" to about 0.2" by 2045
Mark McCarthy
Fremont (California/USA)
508mm (1067x) BC: I spent a good long while on this one, and tried hard to nail down the position angle. At 1067x, both with and without an apodising mask, but both times with a #80A light blue filter, which did seem to calm the diffraction a little, I had a clear view of the elongation with a strong sense of the weaker end being to the East or to the ESE. I also tried a 78% central obstruction mask, and while the diffraction became a grid, and the disks much smaller, I could clearly see the same elongation and weaker end, though at a much smaller scale. To my delight the current orbital solution puts the PA at 120.6-degrees, 0.179" separation, so I think I have detected it. I can't wait until 2033 when this becomes an easy pair!
Werner E. Celnik
Rheinberg (Germany)
150mm A-BC ../projects/double-stars/werner-celnik/photographs/GammaAnd%202011-10-31%201800UT%20Refr_150-1100%20DBK21_Col%207ms%205minGIOTTOMittel7500fr%20A10436%20kl.jpg
Winfried Kräling
Marburg (Germany)
127mm A-BC: Aufnahme vom 11.09.2020 am 127/1200mm Refraktor mit Barlowlinse (~2.5x)
Weit getrennt, Komponente A: goldgelb bis orange, Komponente BC: weißlich blau
../projects/double-stars/winfried-kraeling/photographs/2020-09-11-2012UT-Doppelstern-Gamma%20And.jpg
STI1797 7m5 11m8 8.6'' 142° 2015 Per 02h10m24.05s +56°17'49.60"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty orange and blue stars, 2-3 delta mag, well separated 10"
★★ 59 And, STF222 6m0 6m7 16.6'' 36° 2019 And 02h10m52.83s +39°02'22.40"
Robert Zebahl
Leipzig (Germany)
8x44 2020-11-25: Just separated with visible difference in brightness.
René Merting
Drachhausen (Germany)
16x70 ein sehr dichtes Sternpaar, ganz knapp getrennt sichtbar - Komponente B im NO ist eine halbe Größenklasse schwächer - leichter Farbunterschied und das Phänomen, dass der Farbkontrast zwischen beiden Sternen immer hin und her springt - ich kann nicht genau sagen, welcher Stern das kühlere oder wärmere Weiß hat
Christopher Hay
Seeheim (Germany)
71mm (32x) Widely separated. Primary slightly orange, secondary blueish. Very attractive and without visual competition in 2.5° FOV.
A physical double at a distance to us of 456 light years.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein auffälliges Sternpaar - gut getrennt mit leichtem Farbkontrast, Komponente A im SW ist weiß, die Komponente B zwar auch, aber mit einem Stich ins orange, eigenartig - Helligkeitsunterschied eine halbe Magnitude
Robert Zebahl
Leipzig (Germany)
120mm (18x) Well split with noticeable difference in brightness.
Robert Zebahl
Leipzig (Germany)
200mm (100x) Conditions in the target region: SQM-L 20.4
Nice and evident double star, easy to split. About 12 arcminutes NE there is NGC828 (v12.3m),
★★★ STF227, iota Tri, 6 Tri 5m3 6m7 3.7'' 69° 2016 Tri 02h12m22.28s +30°18'11.10"

../images/binary-star-orbits/STF227-orbit-solution-1.jpg ../images/binary-star-orbits/STF227-orbit-solution-2.jpg

Robert Zebahl
Leipzig (Germany)
70mm (57x) At 44x even separable with a clear difference in brightness, whereby the companion is almost outshone by the primary component. At 57x easy to separate. Primary component shines in bright orange, companion slightly orange. Beautiful sight together with STF232 in one field of view! ../projects/double-stars/robert-zebahl/sketches/2019-12-12_6_tri_stf232.jpg
Uwe Pilz
Leipzig (Germany)
105mm (88x) weiß und blau ../projects/double-stars/uwe-pilz/sketches/191230stf227.jpg
Christopher Hay
Seeheim (Germany)
180mm (110x) Well separated. Primary yellowish, secondary light blue. When 6 Tri drifts out of 0.6° FOV, STF232 drifts in.
6 Tri is a physical double at a distance to us of 291 light years.
Mark McCarthy
Fremont (California/USA)
203mm (205x) 6 Tri. Yellow A, white b, pretty. Wide, about two delta mag
Frederik Wanink
Itterbeck (Germany)
254mm (200x) Helligkeitsunterschied deutlich
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern ist noch gut zu trennen und der Helligkeitsunterschied ist mit gut 1,5 mag schon sehr auffällig. Der hellere Stern erstrahlt schön gelblich, der schwächer weiß. In den Momenten der wirklich ruhigen Luft, ein sehr schöner Doppelstern
★★★ STF231, 66 Cet AB 5m7 7m7 16.8'' 235° 2019 Cet 02h12m47.54s -02°23'37.10"
Christopher Hay
Seeheim (Germany)
30x80 Wide split. A is cream-white, B of indeterminate colour. Attractive pair in 1.7° FOV, scenery accentuated by 63 Psc about 3/4° to northwest.
While pleasant with 30x80, the pair becomes suprisingly difficult to split with 20x80, presumably due to the cumulative effect of 2m delta-mag and the red colour of the companion, which makes it stand out less than if it were blue (colour not seen, but stressed by Uwe Pilz in his 105mm observation, see below).
Uwe Pilz
Leipzig (Germany)
105mm (88x) weiß und leuchtend rot! ../projects/double-stars/uwe-pilz/sketches/191129_66Cet.jpg
S405 AB 6m5 7m2 55.7'' 278° 2019 Cep 02h12m49.98s +79°41'29.30"
BC 7m2 13m9 51.2'' 224° 2015
Christopher Hay
Seeheim (Germany)
10x42 AB: B well set off from A.
South 405 (aka STTA 22 and H5 84) is a physical double at a distance to us of 121 light years.
Christopher Hay
Seeheim (Germany)
15x60 AB: Wide pair. A seems a little yellowish.
Christopher Hay
Seeheim (Germany)
71mm (32x) AB: Wide apart. A distinctly brighter and distinctly more yellowish than B.
René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 20x weit auseinander stehendes helles Pärchen - beide Sterne sind etwa gleich hell (laut Stelle Doppie 0.68 mag Helligkeitsunterschied)
★★★ STF232 7m8 7m9 6.7'' 69° 2019 Tri 02h14m42.16s +30°23'41.20"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Very beautiful view! With all used magnifications together with iota Tri (6 Tri) in one field of view. Separable at 22x, but the components are still quite close together and appear similarly bright. At 44x easy to separate with little difference in brightness. At 57x a very small color difference is visible without being able to clearly name the colors. STF232 was sketched together with 6 Tri.
Christopher Hay
Seeheim (Germany)
180mm (110x) Wide separation. Very even brightness. Northeast secondary appears slightly bluish compared to primary.
Mark McCarthy
Fremont (California/USA)
203mm (205x) Pretty white stars, only a slight delta mag, well split
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern einfach zu trennen und beide Sterne haben die gleiche Hellgkeit. Da beide weißlich strahlen, habe ich den Eindruck, als würden zwei Scheinwerfer aus dem All in unsere Richtung leuchten.
STF234 AB 8m7 9m4 0.6'' 222° 2012 Cas 02h17m23.00s +61°21'06.50"

../images/binary-star-orbits/STF234-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (885x) Light orange star, definitely elongated, maybe notched, but no convincing split. Tough little Struve.
HLD7 8m0 9m9 1.7'' 182° 2016 Per 02h25m25.96s +58°12'09.30"
Mark McCarthy
Fremont (California/USA)
203mm (533x) Yellow A and bluish b, just split the faint B, in a swimming mess due to poor seeing
Mark McCarthy
Fremont (California/USA)
317mm (553x) Challenging due to poor transparency but no doubt, a 3 delta mag pair in the diffraction, 1.5"
★★ iota Cas, STF262 & CHR6 CHR6 Aa-Ab 4m6 8m5 0.6'' 42° 2010 Cas 02h29m03.96s +67°24'08.70"
STF262 AB 4m6 6m9 2.9'' 230° 2017
STF262 AC 4m6 9m1 6.7'' 117° 2015
STF262 AD 4m6 8m5 210.9'' 60° 2016

../images/binary-star-orbits/CHR6-Aa-Ab-orbit.jpg ../images/binary-star-orbits/STF262-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
55mm (27x) Only the D component was well visible. The components B & C were not visible even at magnifications up to 167x. The sky was clearly brightened (Bortle 7).
Robert Zebahl
Leipzig (Germany)
70mm (120x) Components A, B and C pretty close together, D far apart. Component B appeared slightly elongated on the first diffraction ring of the primary component. Rewarding! ../projects/double-stars/robert-zebahl/sketches/2019-08-25_iota_cas.jpg
René Merting
Drachhausen (Germany)
100mm (142x) AB: bei 142x zeigt sich Komponente B im SW mit gut einem Drittel das Abstandes AC, Helligkeitsunterschied 1.5 bis 2 Größenklassen
AC: bei 64x getrennt, schöner Farbkontrast, Komponente A ist weiß mit einem Stich ins Gelbe, C leicht bräunlich
AD: bei 32x extrem weiter Abstand zwischen A und D, Helligkeitsunterschied mehr als 2 Größenklassen (laut Stelle Doppie sogar 3.85 mag)
Uwe Pilz
Leipzig (Germany)
105mm (200x) Dreifachstern lohnend ../projects/double-stars/uwe-pilz/sketches/iotaCas.jpg
Sarah Gebauer
Germany
150mm (160x) bei 160x sind die Komponenten AC getrennt, B leider nicht, die schwache Komponente C versinkt fast im Strahlen der hellen Komponente A, ein sehr reizvoller Anblick! Von Komponente D wusste ich während der Beobachtung noch nichts, sie taucht unter den Feldsternen der Zeichnung auch auf ../projects/double-stars/sarah-gebauer/sketches/20200731%20Iota%20Cas%20DSk.jpg
Robert Zebahl
Leipzig (Germany)
152mm (129x) Component D easy to see even at lowest magnification. Component C is also easily visible at 49x. At 69x the component B is indicated, at 100x clearly visible. C appears slightly grey-bluish and obviously fainter than B. Grand sight at 129x!
Mark McCarthy
Fremont (California/USA)
508mm (1067x) CHR6 (Aa-Ab): This is a component of Iota Cas, STF 262 (which is a really pretty triple). CHR 6 at 1067x and seeing through the speckle image, I get elongation with a suspected blunter end which I assume is the B side, PA to the north [it's actually to the south -- my general orientation is correct but mis-interpret the brighter end]. Physical with 47 year period, currently at periastron and will tighten to 0.2" by 2036
STF270 AB 7m0 9m7 21.3'' 306° 2016 Per 02h30m50.65s +55°32'54.20"
AC 7m0 11m4 48.0'' 333° 2015
AD 7m0 14m2 51.1'' 281° 2015
BD 9m7 14m2 32.8'' 265° 2015
René Merting
Drachhausen (Germany)
16x70 AB: der Doppelstern steht innerhalb einer sehenswerten Formation aus 6 Sternen, die ein gleichseitiges Dreieck bilden - die hellsten drei Sterne bilde eine Seite im Norden, zur Spitze nach Süden werden die Sterne immer schwächer - STF270 steht mitten in der Nordseite - Komponente B ist wie ein kleiner zarter Hauch nordwestlich von A erkennbar, Helligkeitsunterschied mehr als 2.5 Größenklassen - kein reizvoller Fernglas-Doppelstern, aber die Umgebung ist interessant
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x ein leichter Fang, gut getrenntes Pärchen - Komponente B im NW ist zwar sehr schwach, aber direkt immer noch gut erkennbar - Helligkeitsunterschied 3 Größenklassen - Komponente A strahlend weiß, B eher grau, wenn überhaupt als Farbe erkennbar
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Nice orange star with wide B
★★★ STF93, alpha UMi, 1 UMi, Polaris AB 2m0 9m1 18.4'' 236° 2016 UMi 02h31m49.09s +89°15'50.70"
AC 2m0 13m8 39.0'' 103° 2016
AD 2m0 14m3 83.2'' 194° 2016
Christopher Hay
Seeheim (Germany)
71mm (32x) B well separated, a fine blue pinprick next to luminous yellow A.
Alpha UMi, Polaris, is a physical double at a distance to us of 433 light years.
Christopher Hay
Seeheim (Germany)
76mm (40x) B well set off from A. Glare from A is an issue, consciously trying to ignore A helps. Very slight yellowish tone of A. Seeing the difficulty makes it clear why attempts in other nights to split the pair with 25x80 binoculars failed.
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x knallt die Hauptkomponente A schön hellgelb rein, Komponente B ist als feiner zarter Lichtpunkt knapp daneben erkennbar - Größenklassenunterschied nicht abschätzbar, auf jeden Fall riesig
Christopher Hay
Seeheim (Germany)
180mm (113x) B widely separated from A. A has definite yellowish hue. B luminous aquamarine blue, very attractive.
René Merting
Drachhausen (Germany)
320mm (45x) AB: bei 45x ist B sehr knapp getrennt von A erkennbar - Komponente A strahl auf den ersten Blick weiß, bei genauerem Hinsehen mischt sich ein zartes Gelb unter
★★ AG304, 15 Tri 5m6 6m8 142.4'' 16° 2013 Tri 02h35m46.82s +34°41'15.20"
Christopher Hay
Seeheim (Germany)
7x50 Well split. Main star yellow-orange, secondary an ice-blue pinprick. With overall brightness of 5m1 just visible to naked eye under my suburban sky. Interesting star field with a line of 5 stars pointing S-SW away from 15 Tri and a further striking star chain to the west. Placing Gamma-Delta-7 Tri within 7.5° FOV makes a very attractive overall field. Mira variable R Tri just ½ degree to the S-SE was around maximum at time of observation and presented a much paler orange than 15 Tri A. Charming colour contrast ensemble with the two components of the double plus the variable.
René Merting
Drachhausen (Germany)
18x70 ein extrem komfortabel getrenntes Sternpaar - Komponente A im Süden strahlt weißgelb, B ist 1.5 Größenklassen schwächer und wirkt kupfergrau - interessant: parallel zu den beiden Sternen stehen westlich zwei deutlich schwächere Sterne in gleichem Abstand und Positionswinkel wie die Komponenten von 15 Tri - alle 4 Sterne bilden ein Parallelogramm
Christopher Hay
Seeheim (Germany)
80mm (30x) A beautiful, wide pair. Main star orangish yellow, secondary ice-blue. Attractive star field in 2.7° FOV: several similarly-separated pairs to the north and east, and two striking star chains to the south and west.
Sarah Gebauer
Germany
100mm (21x) ein wirklich schönes, farbiges Pärchen, das schon bei geringster Vergrößerung deutlich getrennt und in einem Eisblau und leichtem Orange strahlt, zudem bildet es mit der markanten Sternkette östlich davon, die im Refraktor mit Amiciprisma ein auf dem Kopf stehendes T bildet, ein tolles Gesamtbild
★★ 30 Ari STFA5 AB 6m5 7m0 37.9'' 275° 2019 Ari 02h37m00.52s +24°38'50.00"
RAO8 BC 7m0 11m0 0.6'' 282° 2018
Robert Zebahl
Leipzig (Germany)
8x44 AB: 2020-11-25: Easy to split at still quite small separation and visible difference in brightness. The primary component appeared white-yellowish, the companion darker.
Robert Zebahl
Leipzig (Germany)
70mm (22x) AB: At 22x widely separated, striking with a rather small difference in brightness. A seemed a bit warmer in color compared to B with a hint of orange. At 44x, both seemed slightly orange with very little difference in color.
Uwe Pilz
Leipzig (Germany)
105mm (88x) AB: trennbar bei 22x. Weiß und blau ../projects/double-stars/uwe-pilz/sketches/191230_30Ari.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) AB: Near equal light orange, very wide. B has a C pair 0.6" and 4 delta mag.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Near equal magnitude, wide separated, PA to WSW
A1279 10m1 10m1 2.1'' 306° 2015 Per 02h40m25.95s +55°18'33.40"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Can just see the faint star in the 80mm finder. In the scope it is a hazy elongated smear which resolves to two equal points with seeing, 2", Very nice!
STF291 AB 7m7 7m5 3.4'' 117° 2020 Ari 02h41m06.59s +18°48'00.70"
AC 7m7 9m5 65.5'' 242° 2015
Robert Zebahl
Leipzig (Germany)
70mm (57x) AB: At 44x almost, at 57x clearly split, but still very tight with rather small difference in brightness.
Uwe Pilz
Leipzig (Germany)
105mm (88x) hellster Stern gelb, andere Farben nicht erkennbar ../projects/double-stars/uwe-pilz/sketches/191230stf291.jpg
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: White stars, near equal, close but well split, makes a 2+1 with a ~2 delta mag, very wide C
★★ STT44 AB 8m5 9m0 1.4'' 56° 2018 Per 02h42m13.13s +42°41'57.20"
AC 8m5 8m3 87.2'' 290° 2017
Uwe Pilz
Leipzig (Germany)
105mm (200x) AB: schwierig
Robert Zebahl
Leipzig (Germany)
152mm (129x) AB: At 129x barely separable, at 150x separated quite clearly with a noticeable difference in brightness. The double star is located within Messier 34!
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: In M34 open cluster! Close near equal pair, 1.5", very nice! The cluster is pretty, loose, and jangly with stars of varying magnitudes. What a treat.
BU306 AB 6m4 10m4 3.0'' 19° 2015 Ari 02h43m51.25s +25°38'18.00"
Mark McCarthy
Fremont (California/USA)
317mm (277x) Very nice white and 3 delta mag bluish B, nicely seen 4".
★★ eta Per, 15 Per STF307 AB 3m8 8m5 28.7'' 301° 2018 Per 02h50m41.81s +55°53'43.80"
STF307 AC 3m8 11m6 64.0'' 269° 2014
WAL19 AF 3m8 11m4 57.7'' 25° 2013
WRD1 CD 11m6 12m7 5.2'' 116° 2015
SHJ34 AE 3m8 9m2 242.9'' 297° 2012
FYM161 CG 11m6 14m0 15.8'' 229° 2015
René Merting
Drachhausen (Germany)
16x70 STF307 (AB): Miram, die Komponente A ist satt gelb und bildet ein flaches Dreieck mit zwei Sternen westlich und nordwestlich, die aber 1,8' und 3,9' entfernt stehen - dazwischen wird alles vom Glanz von Miram überstrahlt - im Fernglas hat B mit den eigentlich ordentlichen Daten wie Abstand 30,4" und Helligkeit 8.5 mag (andere Quellen sagen 10.7 mag) trotzdem keine Chance auf Erleuchtung
René Merting
Drachhausen (Germany)
100mm (32x) STF307 (AB): bei 32x sehr ansehnlich - Komponente B steht gut getrennt nordwestlich vom signal-gelben Eta Persei - Helligkeitsunterschied sehr groß, nicht abschätzbar
Uwe Pilz
Leipzig (Germany)
105mm (88x) Dreifachsystem, nahe Komponente: PW und Abstand stimmt, is aber viel zu dunkel (10m statt 8m5). Ein Mysterium
Mark McCarthy
Fremont (California/USA)
317mm (553x) STF307 (AB): Orange with faint, bluish, widely separated B.
A2906 & STF314 A2906 AB 7m3 8m8 0.3'' 115° 2018 Per 02h52m52.03s +52°59'50.60"
STF314 AB-C 7m0 7m3 1.6'' 316° 2018

../images/binary-star-orbits/A2906-AB-orbit.jpg ../images/binary-star-orbits/STF314-AB-C-orbit.jpg

Robert Zebahl
Leipzig (Germany)
152mm (129x) STF314 (AB-C): Beautifully separated, quite close together. Difference in brightness visible, but rather small. Easy to find and bright. Very nice.
Frederik Wanink
Itterbeck (Germany)
254mm (460x) STF314 (AB-C): ähnlich hell ../projects/double-stars/frederik-wanink/sketches/STF314.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) A2906 (AB): This is the brighter of the STF 314 pair. I have a feeling it is slightly elongated but nothing certain.
Mark McCarthy
Fremont (California/USA)
317mm (553x) STF314 (AB-C): near equal brightness, AB more yellow yellow-white of the two, ~2 disk separation
STF333, eps Ari AB 5m2 5m6 1.5'' 211° 2019 Ari 02h59m12.73s +21°20'25.60"

../images/binary-star-orbits/STF333-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (205x) Eps Ari: Beautiful split of white stars, less than 1 delta mag, a little more than 1". Very nice pair. Physical with a 1215 year period
STF346, 52 Ari AB 6m2 6m2 0.5'' 256° 2016 Ari 03h05m26.69s +25°15'18.70"
AB-C 5m5 10m8 5.1'' 358° 2005
AB-D 5m5 13m3 102.1'' 83° 2013
AB-E 5m5 12m8 133.5'' 192° 2014

../images/binary-star-orbits/STF346-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) AB: What a great set! The closest are a near equal pair of white stars, elongated with a slight notch, There's a faint C ~5" and slight more than a right angle in PA. Interesting set. Physical with 227 year period
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB-C: Bright yellow-white AB, orange C. ~4-5 delta mag, 5-6" PA to N. Did not notice AB 0.5"
★★ STT51 8m5 8m7 0.6'' 346° 2018 Per 03h12m57.08s +44°17'14.70"

../images/binary-star-orbits/STT51-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Very fine clean split at the finest moments, which is once every 10 seconds. 0.5", equal mag.
STF379 8m6 8m8 10.4'' 101° 2010 Ari 03h22m51.83s +29°49'06.30"
Christopher Hay
Seeheim (Germany)
180mm (113x) Well separated but very strongly appearing to belong together. This impression is fostered by the almost identical brightnesses and the complete lack of visual competition in 0.6° FOV. Leading star appears at first sight more orange than the other, but after a while this shifts to the other star. The pair is visually very attractive at this power, and a true physical one at 670 light years distance from us.
Mark McCarthy
Fremont (California/USA)
203mm (205x) Very wide, near equal white stars. Physical
STF388 8m0 9m0 2.8'' 214° 2018 Per 03h28m40.39s +50°26'10.80"
René Merting
Drachhausen (Germany)
100mm (107x) bei 107x zeigt sich Komponente B südlich von A und nur in guten Momenten sind beide Sterne knapp getrennt zu sehen
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty blue and a little red pair, 1.5 delta mag. On the northern edge of Stock 1.
★★ STF401 AB 6m6 6m9 11.5'' 270° 2020 Tau 03h31m20.76s +27°34'18.50"
Christopher Hay
Seeheim (Germany)
18x80 Cleanly split. Supplemented nicely by the wide pair STFA7 directly north, in very star-poor surroundings in 4° FOV.
Christopher Hay
Seeheim (Germany)
71mm (13x) Just separated.
Uwe Pilz
Leipzig (Germany)
105mm (21x) ein Hauch schwärze dazwischen ../projects/double-stars/uwe-pilz/sketches/stf401.jpg
Robert Zebahl
Leipzig (Germany)
120mm (18x) Barely split at 18x. At 40x difference in brightness is visible. Nice view together with the double star STFA7 located northwest.
Christopher Hay
Seeheim (Germany)
180mm (113x) Very wide separation. Southern component slightly towards orange compared to the northern one, which is slightly towards blue. Very attractive in 0.6° FOV with STFA7.
A physical pair at 318 light years distance from us.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal white ~7", nice, W-E. Forms a double-double in wider FOV with STF 375.
★★★ STF412, 7 Tau AB 6m6 6m9 0.8'' 351° 2019 Tau 03h34m26.62s +24°27'52.10"
AB-C 5m9 9m9 22.4'' 53° 2014

../images/binary-star-orbits/STF412-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (260x) AB: A-B länglich
Christopher Hay
Seeheim (Germany)
180mm (110x) No definite elongation of AB seen at 110x, seeing is poor. But nice pinprick of light wide off to NE, seems bluish, this is the C component.
AB-C is physical at 429 light years distance from us, and so is A-B, so this is a physical triple system. Very easy to find 3° due west of the Pleiades.
BU533 AB 7m5 7m7 1.0'' 222° 2018 Per 03h35m37.81s +31°40'48.70"

../images/binary-star-orbits/BU533-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
152mm (225x) At 129x clearly elongated, notched. At 225x just so separable with similarly bright components.
Mark McCarthy
Fremont (California/USA)
317mm (270x) Overlapping yellow-orange disks, equal mag
★★ S430 AB 7m2 7m5 41.0'' 96° 2017 Per 03h38m18.83s +44°48'06.50"
Christopher Hay
Seeheim (Germany)
7x50 On tripod. Well separated. A evidently brighter than B. A appears to tend towards orange, B rather towards blue.
Most of the Alpha-Persei cluster can be viewed together with S430 in 7.2° FOV. Seen thus, S430 feels likes a distant little echo of the powerfully orange-blue pair Sigma Per in the cluster.
South 430 is a physical double at a distance to us of 498 light years.
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. AB widely separated, greater brightness of A is distinct. The colour hues that were uncertain in 7x50 are now clearer. Colours confirmed in 15x60 on tripod.
Robert Zebahl
Leipzig (Germany)
16x70 2020-11-07: Easily separated at moderate separation, nearly equal in brightness. White-yellowish & white-bluish.
René Merting
Drachhausen (Germany)
16x70 ein schöner Fernglas-Stern - beide Komponenten sind hell genug und stehen weit genug auseinander - sie sind mehr als ordentlich getrennt - die B-Komponente im Osten wirkt ein bisschen wärmer im Farbton
STF434 AB 7m8 8m3 33.7'' 83° 2019 Per 03h43m58.92s +38°22'25.60"
AC 7m8 13m6 91.9'' 350° 2015
Robert Zebahl
Leipzig (Germany)
16x70 AB: 2020-11-07: Beautiful sight! Nice separation and color contrast: vivid orange & subtle blue.
Robert Zebahl
Leipzig (Germany)
102mm (28x) AB: 2020-11-08: Easy to separate, beautiful sight! Light orange & light blue. ../projects/double-stars/robert-zebahl/sketches/2020-11-08_stf434.jpg
★★ BU535, omicron Per, 38 Per, Atik 3m9 6m7 1.1'' 20° 2015 Per 03h44m19.13s +32°17'17.70"
Uwe Pilz
Leipzig (Germany)
105mm (88x) =omikron Per, in IC348, lohnend! ../projects/double-stars/uwe-pilz/sketches/ic348.jpg
Robert Zebahl
Leipzig (Germany)
152mm (300x) In steady moments the faint companion is clearly recognizable as a small brightening in the first diffraction ring of the primary component.
Mark McCarthy
Fremont (California/USA)
317mm (270x) No split at 270x
★★★ STF470, 32 Eri AB 4m8 5m9 6.9'' 349° 2019 Eri 03h54m17.49s -02°57'17.00"
Robert Zebahl
Leipzig (Germany)
55mm (27x) At 27x split, but still tight with noticeable difference in brightness. A slight difference in colors could be seen. At 56x the color difference was very evident: The brighter component appeared slightly yellowish, the fainter one slightly bluish. Highly recommended! The sketch was done few days later during another observation. ../projects/double-stars/robert-zebahl/sketches/2019-02-09_32_eri.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) Farbkontrast, gelborange-blauweiß ../projects/double-stars/uwe-pilz/sketches/32Eri.jpg
KU16 AB 10m5 11m2 2.4'' 268° 2015 Per 03h56m18.22s +51°07'58.70"
Mark McCarthy
Fremont (California/USA)
203mm (121x) Wow! Very fine pair, slight mag difference, faint ~10th magnitude, well split B resolves with seeing
HLD10 9m4 10m8 4.2'' 91° 2018 Per 04h02m27.53s +48°23'43.10"
Mark McCarthy
Fremont (California/USA)
203mm (121x) Wow! good one. ~2 delta mag, ~4", very fine B. Nice pair -- but not physical!
STF494 7m5 7m7 5.2'' 188° 2020 Tau 04h08m53.50s +23°05'55.10"
Robert Zebahl
Leipzig (Germany)
102mm (62x) At 28x separated, but very tight, similarly bright, both whitish. At 62x easy to separate, little difference in brightness and color: slightly orange; white-bluish. Color impression slightly more intense at 86x.
Robert Zebahl
Leipzig (Germany)
152mm (49x) Easy to separate at 49x with subtle color differences: slightly orange; white-bluish. Color impression slightly more intense at 100x. Beautiful sight.
omicron 2 Eri, 40 Eri, STF518 A-BC 4m4 9m3 82.7'' 102° 2019 Eri 04h15m16.32s -07°39'10.30"
BC 9m5 11m2 8.2'' 330° 2019

../images/binary-star-orbits/STF518-BC-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (244x) A ist gelblich. B fiel sofort ins Auge, auch bei 144x. C war extrem schwierig. A musste außerhalb des Gesichtsfeldes stehen, aber auch dann war er nur indirekt sichtbar. Dann aber überraschte der verhältnismäßig große Abstand B-C. ~ A ist ein Hauptreihenstern ähnlich der Sonne. B ist ein weißer Zwerg, einer der hellsten am Himmel. C ist ein Roter Zwerg, davon gibt es nicht viele in der Reichweite kleiner Instrumente. Insgesamt hat man drei Zwergsterne auf einen Blick: Einen gewöhnlichen (=Hauptreihen-) Zwerg, einen weißen und einen roten. ../projects/double-stars/uwe-pilz/sketches/200120_40Eri.jpg
Berthold Fuchs
Wiesbaden (Germany)
130mm A-BC: Triplesystem with a white Dwarf ../projects/double-stars/berthold-fuchs/photographs/Keid.png
STTA44 7m1 8m0 58.6'' 321° 2017 Per 04h17m19.77s +46°13'03.60"
Robert Zebahl
Leipzig (Germany)
16x70 2020-11-07: Very nice sight, moderate separation & difference in brightness. Slightly yellow-orange & subtle bluish.
STF520 8m3 8m4 0.6'' 83° 2019 Tau 04h18m14.55s +22°48'24.60"

../images/binary-star-orbits/STF520-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Faint elongated to overlapping disks.
STF519 & GUI5 STF519 AB 7m8 9m4 17.9'' 348° 2015 Per 04h20m53.71s +50°22'39.00"
GUI5 AC 7m8 10m8 108.8'' 193° 2015
Robert Zebahl
Leipzig (Germany)
16x70 STF519 (AB): 2020-11-07: Beautifully framed by brighter stars! Primary component A appears slightly orange with a much fainter, very close companion. To the south is S445, which forms a prominent triangle of stars of different brightness. The brightest of these three stars also appears orange.
Robert Zebahl
Leipzig (Germany)
102mm (28x) STF519 (AB): 2020-11-08: Well separated with large difference in brightness. Primary component appeared white-yellowish. South very outstanding is the double star S445. Worthwhile due to the beautiful surroundings. ../projects/double-stars/robert-zebahl/sketches/2020-11-08_stf519_s445.jpg
★★★ STFA10, theta 2 Tau, 78 Tau AB 3m4 3m9 347.9'' 339° 2016 Tau 04h28m39.74s +15°52'15.20"
Christopher Hay
Seeheim (Germany)
2x54 Well separated, luminous orange and ice blue. Gorgeous with entire Hyades and Pleiades in 25° field of view.
Theta Tau is a physical double at a distance to us of 150 light years.
Christopher Hay
Seeheim (Germany)
7x45 Theta Tauri. Luminous orange and blue. Wide apart but very much feeling to belong together, despite the many stars of the Hyades all around.
A physical pair. The data suggest separation with naked eye is possible, something to try in good health under a steady sky. At all events with naked eye Theta Tauri is at the centre of the southern stroke of the Hyades' distinctive "V" shape. In the binoculars, by ignoring Aldebaran, which is not a cluster member but a foreground star, it suddenly becomes apparent that Theta Tauri is in fact at the centre of the Hyades in our sky and is its lucida. This impression is supported very nicely by 7x and 8.6° FOV. Definitely one of the finest doubles for this class of binocular.
★★ STF559 7m0 7m0 3.0'' 278° 2019 Tau 04h33m33.04s +18°01'00.20"
Robert Zebahl
Leipzig (Germany)
70mm (57x) Barely split with similarly bright components.
Robert Zebahl
Leipzig (Germany)
102mm (160x) Very nice view! Easy to separate, similarly bright at a nice distance from each other. The colors of the components changed over time: orange and subtle blue.
Uwe Pilz
Leipzig (Germany)
105mm (144x) trennbar mit 88x, westlicher Stern scheint etwas heller und gelb-orange, östlicher Stern orange ../projects/double-stars/uwe-pilz/sketches/200115stf559.jpg
Robert Zebahl
Leipzig (Germany)
152mm (69x) Beautiful sight, similar bright components, pretty tight.
★★ STF572 AB 7m4 7m2 4.4'' 189° 2018 Tau 04h38m29.58s +26°56'25.60"

../images/binary-star-orbits/STF572-AB-orbit.jpg

Christopher Hay
Seeheim (Germany)
42mm (12x) Slightly elongated. PA seen definitely without prior knowledge, confirmed in 3-inch.
Robert Zebahl
Leipzig (Germany)
70mm (57x) Clearly separated, easy with beautiful color contrast: A slightly orange, B white.
Christopher Hay
Seeheim (Germany)
76mm (83x) Well separated, very even matched pair.
★★ STF616, omega Aur, 4 Aur AB 5m0 8m2 4.7'' 2015 Aur 04h59m15.41s +37°53'24.90"
Robert Zebahl
Leipzig (Germany)
70mm (57x) Easy, still relatively tight with a large difference in brightness. Component A appeared pretty bright and white-yellowish, while B appeared only as a tiny star. Very nice sight.
Uwe Pilz
Leipzig (Germany)
105mm (88x) blau und weiß ../projects/double-stars/uwe-pilz/sketches/200111_omegaAur.jpg
Uwe Pilz
Leipzig (Germany)
105mm (144x) gelb. Schöner Helligkeitskontrast, dabei aber einfach. Auch bei 88x trennbar ../projects/double-stars/uwe-pilz/sketches/191216_4Aur.jpg
Mark McCarthy
Fremont (California/USA)
203mm (113x) Omega Aurigae. The A was a surprising sickly blue-green color, and the B was a tawny brown, nicely split 5" away.
★★ STF644 AB 7m0 6m8 1.6'' 221° 2019 Aur 05h10m18.81s +37°18'06.70"
Robert Zebahl
Leipzig (Germany)
70mm (100x) At 57x slightly elongated with a partially visible notching. At 100x & 133x two clearly overlapping diffraction disks are visible as figure '8' with a small difference in brightness.
Robert Zebahl
Leipzig (Germany)
102mm (129x) Grand sight! Two almost touching diffraction disks, slight difference in brightness, both slightly yellowish.
Uwe Pilz
Leipzig (Germany)
105mm (200x) Beide Orange, mit schwarzem Zwischenraum. Lohnend ../projects/double-stars/uwe-pilz/sketches/200115stf644.jpg
Robert Zebahl
Leipzig (Germany)
152mm (129x) Great view, easy to separate, but still quite close together with low difference in brightness. Both components appeared slightly orange.
★★★ STF668, 19 Ori, beta Ori, Rigel A-BC 0m3 6m8 9.7'' 202° 2017 Ori 05h14m32.27s -08°12'05.90"
Robert Zebahl
Leipzig (Germany)
55mm (83x) The second component was immediately seen as faint companion. ../projects/double-stars/robert-zebahl/sketches/2019-01-21_stf668.jpg
Robert Zebahl
Leipzig (Germany)
70mm (67x) First attempt at 133x: much fainter component clearly visible as a tiny star at a relatively large distance. After that the visibility was easy even at 67x. At 44x the faint component could only be guessed.
Robert Zebahl
Leipzig (Germany)
102mm (160x) Much fainter companion immediately visible as tiny star far outside the diffraction pattern of the primary component.
Uwe Pilz
Leipzig (Germany)
105mm (288x) zwei Ringe und zahlreiche radiale Strahlen um den Hauptstern ../projects/double-stars/uwe-pilz/sketches/Rigel.jpg
Jörg S. Schlimmer
Germany
127mm (108x) high contrast ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Rigel_Refraktor_2021_03_07_bear_filtered_96dpi.jpg
Jörg S. Schlimmer
Germany
305mm (170x) high contrast ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung%20Rigel%20Newton%202021_02_27%20bear_filtered_96dpi.jpg
★★ STF653, 14 Aur AB 5m0 10m9 9.8'' 11° 2014 Aur 05h15m24.39s +32°41'15.30"
AC 5m0 7m3 14.3'' 225° 2019
AD 5m0 10m8 179.7'' 322° 2010
Sarah Gebauer
Germany
100mm (45x) AC: schon bei geringer Vergrößerung erkennt man beim zweiten Hinsehen, dass es sich um ein Sternpärchen handelt; ein schönes Doppelsternbeispiel für die Kategorie "ein heller und ein sehr schwacher nah daneben"
Uwe Pilz
Leipzig (Germany)
105mm (88x) AC: heller Stern gelblich weiß ../projects/double-stars/uwe-pilz/sketches/200111_14Aur.jpg
Mark McCarthy
Fremont (California/USA)
317mm (270x) AB: Triple, one of which is one delta mag fainter than the other equal pair. All well separated. [AC is the brighter pair, AB fainter.]
Mark McCarthy
Fremont (California/USA)
317mm (270x) AC: Triple, one of which is one delta mag fainter than the other equal pair. All well separated. [AC is the brighter pair, AB fainter.]
STF666 7m8 7m9 3.2'' 75° 2019 Aur 05h17m05.80s +33°19'47.20"
Robert Zebahl
Leipzig (Germany)
55mm (83x) At 40x slightly elongated, at 38x separated, but tight. Overall faint with components of similar brightness.
Robert Zebahl
Leipzig (Germany)
70mm (57x) Split, no difference in brightness and color. Very nice!
Sarah Gebauer
Germany
100mm (136x) eine Grenzbeobachtung mit dem Vierzöller, aber die Trennung des eher schwachen Pärchens gelingt ganz knapp
★★ STF696, 23 Ori 5m0 6m8 32.0'' 29° 2019 Ori 05h22m50.00s +03°32'40.00"
Christopher Hay
Seeheim (Germany)
15x45 Widely separated but still a little difficult to hold due to large delta-mag.
A physical double at a distance to us of 1553 light years, which is practically the same as Theta 2 Ori in the great Orion Nebula M42.
René Merting
Drachhausen (Germany)
18x70 ein auffälliges gut getrenntes Paar - Komponente B im Norden ist 1.5 Größenklassen schwächer
HU1225 7m8 11m0 3.4'' 320° 1991 Ori 05h22m56.87s +14°21'40.00"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Visible with 20" only, the B star is too faint for the 8" in these conditions. A is light orange, B a deeper orange compared with A, 4 delta mag and ~3.5"
★★★ WNC2 A-BC 6m9 7m0 3.1'' 159° 2019 Ori 05h23m51.32s -00°51'59.80"

../images/binary-star-orbits/WNC2-A-BC-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (44x) Double star appeared elongated.
René Merting
Drachhausen (Germany)
100mm (64x) bei 64x ein extrem eng stehendes wunderschönes Pärchen zweier gleich heller gelber Sterne - keine 8 mehr, beide sind schon getrennt - bei 107x kommt etwas mehr Luft zwischen beide, aber sie scheinen auch ein wenig Farbe zu verlieren
Robert Zebahl
Leipzig (Germany)
120mm (150x) Clearly split with nearly equally bright components.
Mark McCarthy
Fremont (California/USA)
203mm (333x) Nice near equal, light yellow-white stars, well split. nice pair [BC is A 847 7.67/7.84 0.3" and could have been gotten on a better night!]
Mark McCarthy
Fremont (California/USA)
508mm (533x) Easy and obvious pair, bright 7th mag stars ~3". [This was a first try at the short period list but I missed the object, which is A 847 BC, 7.67/7.84 0.3" -- need to try again.]
A2703 8m4 9m0 0.2'' 90° 1995 Ori 05h24m33.14s +09°10'15.10"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Definite notch at best moments, slight magnitude difference, tough
STF698 AB 6m7 8m3 31.4'' 348° 2019 Aur 05h25m12.94s +34°51'18.60"
Robert Zebahl
Leipzig (Germany)
102mm (62x) Beautiful double star, easy to separate and quite striking. Primary component appeared in clear orange, the companion was too faint to identify the color.
Uwe Pilz
Leipzig (Germany)
105mm (88x) rot-orange und blaugrau, lohnend ../projects/double-stars/uwe-pilz/sketches/200111_stf698.jpg
Robert Zebahl
Leipzig (Germany)
152mm (22x) Easy with a attractive separation and a clear difference in brightness. A: pale yellow; B: creamy white with a touch of blue. At 49x the color impression was a bit more intense. Located in beautiful field of stars.
Mark McCarthy
Fremont (California/USA)
317mm (270x) Orange-yellow A and lilac B, wide, finder split, 1 delta mag. Pretty.
STF699 AB 7m9 8m6 8.9'' 346° 2018 Aur 05h25m38.50s +38°02'41.10"
Robert Zebahl
Leipzig (Germany)
55mm (25x) Well separated with slightly fainter companion.
Robert Zebahl
Leipzig (Germany)
70mm (22x) Separated at 22x, but still a relatively tight pair with a moderate difference in brightness. Together with sigma Aur in one field of view. Overall rather dim double star. At 57x very nice view! A: pale orange, B: slightly bluish
Uwe Pilz
Leipzig (Germany)
105mm (88x) schwach, aber lohnend. Orange und blau ../projects/double-stars/uwe-pilz/sketches/191216stf699.jpg
Mark McCarthy
Fremont (California/USA)
317mm (270x) Wide yellow and blue-white, half delta mag.
TDS3201 9m5 9m7 0.4'' 237° 1991 Ori 05h27m40.03s +14°08'08.40"
Mark McCarthy
Fremont (California/USA)
508mm (533x) super fine but split, more than half delta mag, fine focus needed to remove any glare. What a nice pair, ice blue color stars
HU1228 9m8 9m8 0.3'' 16° 2007 Ori 05h29m48.07s +13°34'57.30"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Snowman overlapping disks at best moments, one second out of ten. Slightly orange stars and slight mag difference
★★ STF719 AB 7m5 8m8 1.4'' 336° 2016 Aur 05h30m06.14s +29°32'55.30"
AC 7m5 9m4 15.0'' 353° 2020
Robert Zebahl
Leipzig (Germany)
70mm (22x) AC: At 22x clearly visible difference in brightness at moderate separation. The companion appears only as a dim star. At 57x the color contrast is also quite noticeable. A: light orange, C: silvery blue
Robert Zebahl
Leipzig (Germany)
102mm (62x) AC: Easy with a rather dim companion. The color seemed a bit more intense than in the 6-inch refractor. A: lovely pale orange; B: grey-bluish.
Uwe Pilz
Leipzig (Germany)
105mm (200x) AC: der helle Stern ist weiß. ../projects/double-stars/uwe-pilz/sketches/200111_stf719.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) AB waren schwieriger, als es die Daten vermuten ließen. C ist schwach und erforderte indirektes Sehen ../projects/double-stars/uwe-pilz/sketches/200117stf719.jpg
Robert Zebahl
Leipzig (Germany)
152mm (49x) AC: Easy to separate with a significant difference in brightness. A appeared in bright orange, B appeared greyish-blue.
Robert Zebahl
Leipzig (Germany)
152mm (129x) AB: At 129x clearly elongated. Difference in brightness visible. The seeing was mediocre (3/5), so that the diffraction disks were only occasionally visible. At 180x no better.
Mark McCarthy
Fremont (California/USA)
317mm (277x) AB: widely separated with an orange A and bluish B
delta Ori, Mintaka BU558 AB 2m4 14m2 33.4'' 229° 2016 Ori 05h32m00.40s -00°17'56.70"
STFA14 AC 2m4 6m8 56.2'' 2017
René Merting
Drachhausen (Germany)
10x50 AC: Komponente C zeigt sich gut abgesetzt im NW von A - Helligkeitsunterschied enorm, mindestens 3 Größenklassen
René Merting
Drachhausen (Germany)
18x70 AC: total leicht - Komponente C thront gut getrennt nördlich über A (Mintaka) und ist gut 2 bis 3 Größenklassen schwächer (sogar 4.42 mag laut Stelle Doppie) und trotzdem noch ein mittelheller Stern - A ist gleißend weiß, C weißgrau
Christopher Hay
Seeheim (Germany)
76mm (25x) AC: C set off well from A. A pure white, C steel blue. Although in the middle of Orion the pair dominates the 3.1° FOV.
Uwe Pilz
Leipzig (Germany)
105mm (22x) AC: blau und violett ../projects/double-stars/uwe-pilz/sketches/210222Mintaka.jpg
Uwe Pilz
Leipzig (Germany)
105mm (200x) AC: sehr weit in reichem Sternfeld ../projects/double-stars/uwe-pilz/sketches/Mintaka.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) AC: reinweiß-violett
Mark McCarthy
Fremont (California/USA)
317mm (553x) AC: Bright, 2 delta mag, very wide.
STF730 AB 6m1 6m4 9.7'' 142° 2019 Tau 05h32m14.14s +17°03'29.30"
Christopher Hay
Seeheim (Germany)
10x56 On tripod. A very stretched figure-8. Clear brightness difference between the two ends of the 8.
Christopher Hay
Seeheim (Germany)
15x45 Momentary split, coming and going, a fascinating sight. Quite white, nice together with Ruby Star 119 Tau in 4.5° FOV, and to southwest the fine star field of Collinder 65
Robert Zebahl
Leipzig (Germany)
70mm (22x) At 22x beautiful sight, easy to separate with little difference in brightness. A appeared slightly yellowish. At 57x moderate, but still very nice color contrast: A yellowish, B rather white.
Christopher Hay
Seeheim (Germany)
76mm (23x) Fine split. Attractive in 3.5° field of view together with luminous red Ruby Star 119 Tau.
STF745 AB 8m2 9m3 28.7'' 347° 2014 Ori 05h34m49.12s -06°00'22.90"
AC 8m2 10m4 97.1'' 304° 2014
BC 9m3 10m4 78.4'' 290° 2015
René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 32x interessantes Doppelstern-Paar zusammen mit dem dicht stehenden STF747, der knallig hell daher kommt - Komponente A von STF745 ist noch deutlich schwächer, als die B-Komponente von STF747 - zurück auf 20x sind beide Komponenten schwach erkennbar und knapp getrennt
AC: bei 32x ist Komponente C nordwestlich von A in 2,5-facher Entfernung von AB leicht nach Westen abgeknickt zu erkennen
STF747 & CLL22 & HDS742 STF747 AB 4m7 5m5 36.3'' 224° 2019 Ori 05h35m02.68s -06°00'07.20"
CLL22 AC 4m7 8m9 68.2'' 12° 2000
HDS742 Ba-Bb 5m7 8m8 0.6'' 120° 1991
Christopher Hay
Seeheim (Germany)
7x45 STF747 (AB): Clearly split, with very distinct magnitude difference between A and B components. Hand tremor prevents detection of colour contrast, if there is one at all. A very pleasing tip to Orion’s Sword.
A true physical pair according to Stelledoppie. Distance to us of 1610 light years could indicate membership of stellar association Orion OB1 and thus physical relationship to Orion nebula complex.
René Merting
Drachhausen (Germany)
8x30 STF747 (AB): zwei helle Sterne knapp getrennt, Komponente B im Südwesten nur knapp schwächer
Christopher Hay
Seeheim (Germany)
76mm (25x) CLL22 (AC): Comellas (CLL) 22 is the C component of STF 747 AB. C is a fine pinprick of light, a little less than twice as far from A as B is. Knowing that this is a physical triple system makes a big difference in perceiving it as such at the eyepiece.
René Merting
Drachhausen (Germany)
100mm (20x) STF747 (AB): bei 32x zeigt sich B südwestlich von A gut eine halbe Größenklasse schwächer - B wirkt ein wenig kühler, bläulicher - zurück auf 20x, weiterhin leichte Trennung und Sichtbarkeit
★★★ theta 1 Ori, Trapezium, 41 Ori AB 6m5 7m5 8.9'' 32° 2019 Ori 05h35m15.82s -05°23'14.30"
AC 6m5 5m1 12.9'' 133° 2019
BD 7m5 6m4 19.4'' 121° 2019
CD 5m1 6m4 13.4'' 62° 2019
AE 6m5 11m1 4.6'' 352° 2013
CF 5m1 11m5 4.7'' 120° 2013
Robert Zebahl
Leipzig (Germany)
16x70 2021-02-24: Components A, C & D are clearly separable from each other. The fainter B component is almost completely outshone by A. The pair AB appears clearly elongated and is with concentrated observation in a few moments even visible separated.
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2021-02-24: The different bright components A-D are clearly visible separated from each other.
Christopher Hay
Seeheim (Germany)
71mm (32x) 13x: CD definitely split, A uncertain, B not present.
18x: A, C and D definite, B uncertain.
32x: A, B, C and D present and clear.
Mediocre seeing but good transparency with strong M42 and an inkling of M43 at 32x. B is an eclipsing variable with a period of 6.5 days and an amplitude of 0.6mag, presumably obervation was at minimum, which would explain the difficulty in seeing it at lowest powers. C is the main source of excitation of the great Orion Nebula M42/43.
Jörg S. Schlimmer
Germany
127mm (108x) A-E split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung%20Trapez%20Refraktor%202021_02_28%20bear_filtered_96dpi.jpg
Jörg S. Schlimmer
Germany
305mm (170x) A-F split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung%20Trapez%20Newton%202021_03_02%20bear_filtered_96dpi.jpg
★★ STFA16, theta 2 Ori, 43 Ori AB 5m0 6m2 52.3'' 94° 2019 Ori 05h35m22.88s -05°24'57.70"
AC 5m0 8m5 128.5'' 99° 2019
BC 6m2 8m5 76.5'' 102° 2019
Christopher Hay
Seeheim (Germany)
7x45 AB: On tripod. AB distinctly separate, very double-star-ish. Slightly wider separation than STF 747 AB two degrees to the south. Embedded in glow of M42. Theta 1 Ori (Trapezium) A/C/D appears slightly box-like without resolution.
Theta2 Ori is a physical double at a distance to us of 1546 light years.
STF752, 44 Ori, iota Ori, Nair Al Saif, Hatysa AB 2m8 7m7 12.5'' 146° 2018 Ori 05h35m25.98s -05°54'35.60"
AC 2m8 9m8 49.4'' 103° 2002
BC 7m7 9m8 41.1'' 94° 2015
Christopher Hay
Seeheim (Germany)
71mm (32x) AB: Tight but clearly split, very large delta-mag. No success at 18x.
Iota Ori is thought to be the original home of the runaway star AE Aurigae which currently excites the Flaming Star Nebula.
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 64x tritt Komponente B gut getrennt aus dem Glanz von Komponente A hervor - mindestens 3 Magnituden Helligkeitsunterschied - A leicht gelblich, B braunorange - zurück auf 32x ist B in guten Momenten ganz knapp getrennt von A erkennbar
AC: bei 64x zeigt sich Komponente C südöstlich von A - der Abstand von AC ist gut 4 bis 5x so groß wie Abstand AB - C ist dabei nochmal deutlich schwächer als B - zurück auf 32x ist C auch zu erkennen
STF742 7m1 7m5 4.2'' 275° 2019 Tau 05h36m26.38s +21°59'35.10"

Located about 0.5 degree east of Messier 1.

../images/binary-star-orbits/STF742-orbit.jpg

Christopher Hay
Seeheim (Germany)
76mm (83x) Just split. A little difficult. Suprisingly more difficult than STF572 about 15° to the northwest, although the numbers are very similar and the two systems are standing at identical elevation above horizon. At 40x STF742 is no longer definitely split, but M1 half a degree to the west is strong in 2° FOV by way of compensation.
Robert Zebahl
Leipzig (Germany)
102mm (62x) Beautifully separated, relatively tight with well visible difference in brightness. Points directly toward Messier 1 and can be observed with it in one field of view. Very nice!
Robert Zebahl
Leipzig (Germany)
120mm (48x) Nice, evident double near Messier 1. Easy to split with almost equally bright components.
Robert Zebahl
Leipzig (Germany)
152mm (69x) At 49x just so, at 69x easily separable. The fainter component appeared a little warmer in terms of color. Great view together with Messier 1 in the field of view.
Robert Zebahl
Leipzig (Germany)
200mm (80x) Nice double star with nearly equally bright components.
★★ STF757 AB 8m0 8m3 1.5'' 242° 2018 Ori 05h38m06.52s -00°11'03.50"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty double-double system. AB is close ~1.5" near equal 8th magnitude stars. A-AC widely separated near equal to the east. AD also to the east about 10" separated from A-AC
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty double-double system. AB is close ~1.5" near equal 8th magnitude stars. A-AC widely separated near equal to the east. AD also to the east about 10" separated from A-AC
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty double-double system. AB is close ~1.5" near equal 8th magnitude stars. A-AC widely separated near equal to the east. AD also to the east about 10" separated from A-AC
★★ STF761 AB 7m9 8m4 68.1'' 202° 2016 Ori 05h38m36.54s -02°33'12.70"
AC 7m9 8m6 72.1'' 209° 2016
AD 7m9 11m8 32.7'' 308° 2016
BC 8m4 8m6 8.5'' 269° 2015
Christopher Hay
Seeheim (Germany)
30x80 B-C fine split, C appears slightly weaker than B. Component A is too far away at this power from BC to feel that it belongs. Very attractive ensemble overall in the same field of view with Sigma Ori, which also presents three of its components.
René Merting
Drachhausen (Germany)
100mm (32x) A-BC: bei 32x stehen südlich von Komponente A in ordentlichem Abstand die Komponenten B (und C)
BC: bei 32x sehe ich zwei dicht zusammen stehende gleich schwache Sterne, knapp getrennt
Uwe Pilz
Leipzig (Germany)
320mm (80x) B und C sind deutlich orange. In der Zeichnung ist STF 961 fälschlicherweise mit STF 791 bezeichnet. Im selben Feld wie Sigma Orionis ../projects/double-stars/uwe-pilz/sketches/200212sigmaOri.jpg
26 Aur, STF753 AB-C 5m5 8m4 12.4'' 269° 2019 Aur 05h38m38.10s +30°29'32.80"
Christopher Hay
Seeheim (Germany)
15x60 On tripod. Very stretched figure-8, does not actually resolve. Essential to focus the binoculars on some other star.
Robert Zebahl
Leipzig (Germany)
70mm (22x) Separable at 22x, but quite close together and pretty uneven. Primary component appeared in bright orange. At 57x easy to separate. The faint companion appeared silvery-blue.
Christopher Hay
Seeheim (Germany)
76mm (40x) C clearly set off from AB. AB is yellow, no particular colour seen on C.
AB (also known as BU 1240) is a physical double at 566 light years distance to us. So is AB-C according to Stelledoppie, making this a physical triple system.
Uwe Pilz
Leipzig (Germany)
105mm (88x) heller Stern blauweiß ../projects/double-stars/uwe-pilz/sketches/200215_26Aur.jpg
Christopher Hay
Seeheim (Germany)
180mm (113x) Wide split. Yellow-blue collour contrast of AB to C. Neither of the two colours very strong on its own, but in fine contrast to the other. Reminiscent of the way Polaris appears in a 3-inch at 40x, with less delta-mag, making it easier, but lacking Polaris' dramatic blue of the companion.
Mark McCarthy
Fremont (California/USA)
317mm (277x) Bright yellow AB and a fainter yellow white C.
★★★ sigma Ori, 48 Ori BU1032 AB 4m1 5m3 0.3'' 77° 2015 Ori 05h38m44.77s -02°36'00.20"
STF762 AB-C 3m8 8m8 11.4'' 239° 2019
STF762 AB-D 3m8 6m6 12.9'' 84° 2019
STF762 AB-E 3m8 6m3 41.4'' 62° 2019
STF762 DC 6m6 8m8 23.8'' 252° 2019
STF762 EC 6m3 8m8 52.9'' 242° 2019
STF762 ED 6m3 6m6 29.8'' 233° 2019
STF3135 AB-F 3m8 7m9 208.0'' 324° 2016
Christopher Hay
Seeheim (Germany)
10x42 Binoculars with internal stabilisation, handheld.
AB-D: No split, nor any elongation of AB towards D seen.
AB-E: E is set off well from AB but harder to split than the numbers would suggest. This is partly due to the major delta-mag, and partly to the circumstance that D effectively reduces the "free" stretch of sky to 29".
STF761 is a nice complement a few minutes of arc to the west and makes the visual impression of possibly belonging to the Sigma Ori complex, but Stelledoppie doesn't confirm this.
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld.
AB-D: No split acheived. However, focussing on AB feels uncertain, presumably due to disturbance by D. Also not split with 15x60 on tripod.
AB-E: E is set off well from AB.
Christopher Hay
Seeheim (Germany)
25x80 AB-D: D is set off nicely from AB and appears very slightly on the orange side, particularly in contrast to E.
René Merting
Drachhausen (Germany)
100mm (64x) AB-C: bei 64x zeigt sich Komponente C ganz schwach südwestlich von AB
AB-D: bei 32x schließt sich an die zartgelbe Komponente AB unmittelbar im Osten dicht stehend D weißorange an - ein schickes Trio zusammen mit E weiter östlich
AB-E: bei 32x zeigt sich in vierfacher Entfernung von AB-D die Komponente E weiter östlich in einer Linie - E ist ähnlich hell wie D
Sarah Gebauer
Germany
150mm (125x) ein sehr schönes Muster des Mehrfachsystems, auch wenn längst nicht alle Komponenten getrennt zu sehen waren, AB-C, AB-D und AB-E getrennt, A und B nicht ../projects/double-stars/sarah-gebauer/sketches/20200409%20Sigma%20Ori%20DSk.jpg
Uwe Pilz
Leipzig (Germany)
320mm (80x) AB-C-D schon im Aufsuchokular sichtbar. Sehr lebhafte Farben, einer der schönsten Mehrfachsterne überhaupt. Im selben Feld mit STF761 ../projects/double-stars/uwe-pilz/sketches/200212sigmaOri.jpg
★★ STF764 6m4 7m1 25.8'' 15° 2019 Aur 05h41m20.98s +29°29'14.70"
Christopher Hay
Seeheim (Germany)
7x50 On tripod. PA very clear and the pair splits apart in good moments. Keeping Alnath (Beta Tau) out of the FOV helps. Chi Aur is in a nice little arc of stars on north-western edge of FOV, enhances the aesthetics of the field of view.
Robert Zebahl
Leipzig (Germany)
8x44 2020-11-25: Cleanly split, rather close together. In beautiful star field together with beta Tauri.
Christopher Hay
Seeheim (Germany)
15x60 On tripod. Distinctly split, attractive sight in light orange and light blue, a visually strong pair. 26 Aur (STF753, not quite split) in same 3.3° field of view.
Christopher Hay
Seeheim (Germany)
25x80 Well split. Brighter star honey-yellow, companion ice-blue. Very similar brightnesses. A visually strong, compact pair at this power in 3.2° field of view.
Robert Zebahl
Leipzig (Germany)
55mm (25x) Easy to split with large distance and noticeable difference in brightness.
Robert Zebahl
Leipzig (Germany)
70mm (22x) Very easy and bright, pretty wide apart with a small difference in brightness; whitish and slightly yellowish.
Christopher Hay
Seeheim (Germany)
76mm (40x) Well separated, even brightness of components. A appears immediately orangish, B bluish, but after a minute of observation this impression fades to colourlessness.
Uwe Pilz
Leipzig (Germany)
105mm (88x) blauweiß und orange, kleiner aber gut sichtbarer Helligkeitsunterschied. Schon bei 21x sichtbar, sehr lohnend. ../projects/double-stars/uwe-pilz/sketches/200117stf764.jpg
Christopher Hay
Seeheim (Germany)
180mm (113x) Wide apart but a strong pair with slight delta-mag. Mild orange-to-blue colour contrast of A to B that remains stable in contrast to 76mm observation in same night.
Mark McCarthy
Fremont (California/USA)
317mm (277x) two bright whites widely separated
gamma Lep, 13 Lep H6 40 AB 3m6 6m3 95.5'' 349° 2019 Lep 05h44m27.79s -22°26'54.20"
H5 50 BC 6m3 11m4 112.1'' 1999
Christopher Hay
Seeheim (Germany)
6x30 On tripod. Clearly separated. B appears bluish.
Christopher Hay
Seeheim (Germany)
7x45 On tripod. Clearly separated. Large delta-mag plus scintillation of primary prevent colour perception of B. The 6x30 binoculars show the colour better in the same night. Interesting to note that the 7x45 is at a disadvantage in this regard while the 10x56, however, is superior.
Christopher Hay
Seeheim (Germany)
10x56 On tripod. Widely separated. Rather charming. B distinctly blue. Scintillation plus atmospheric dispersion of A (15° above horizon) prevent determination of any particular hue of A.
A physical double at a distance to us of only 29 light years, which means Gamma Leporis is in our immediate galactic neighbourhood.
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x wunderschön - Komponente A strahlt gleißend gelb, Komponente B extrem weit im NNW ist gut 2 Größenklassen schwächer - viele schwächere Sterne im unmittelbaren Umfeld, sie gehören aber nicht mit zum System
★★ STT117 7m1 10m0 11.7'' 31° 2015 Aur 05h48m11.46s +30°32'06.70"
Mark McCarthy
Fremont (California/USA)
317mm (277x) bright yellow A and a small faint B. Carbon star to the west in FOV. Lovely, colorful field.
STF805 8m4 8m9 12.1'' 50° 2015 Tau 05h51m48.20s +28°26'59.60"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein schwaches Paar - Komponente B zeigt sich knapp abgesetzt im NO von A und ist eine halbe Größenklasse schwächer - unauffällig trotz scheinbarer Sternarmut im Umfeld
Uwe Pilz
Leipzig (Germany)
105mm (88x) schwach, aber lohnend, gelb und blaugrau ../projects/double-stars/uwe-pilz/sketches/200117stf805.jpg
★★ BU1053 6m9 8m8 1.9'' 2019 Aur 05h53m28.64s +37°20'20.70"

../images/binary-star-orbits/BU1053-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (133x) Border observation! Companion is temporarily visible in the correct position angle as an extremely dim brightening of the first diffraction ring of the primary component.
Mark McCarthy
Fremont (California/USA)
317mm (270x) Nice!! Blazing white and close but nicely split light blue B, 2 delta mag.
★★★ 59 Ori H5 100 AB 5m9 10m4 36.7'' 206° 2015 Ori 05h58m24.44s +01°50'13.60"
ARN37 AC 5m9 6m9 177.8'' 293° 2015
Christopher Hay
Seeheim (Germany)
7x45 AC: Handheld: AC wide apart and immediately striking as double star.
On tripod: Wide apart but still very double-star-ish. C appears light blue.
Arnold 37 is a physical double at a distance to us of 364 light years.
Christopher Hay
Seeheim (Germany)
15x45 AC: AC wide apart but holding together visually as strong pair in 4.5° FOV. C distinctly blue, A appears slightly orange in contrast.
STT125 7m9 8m9 1.4'' 2015 Ori 05h59m42.46s +22°28'15.00"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Yes, I have the split! White stars, a half delta mag, close but very clean separation. Nice
STF848 AB 7m3 8m2 2.6'' 110° 2019 Ori 06h08m30.36s +13°58'15.80"
AC 7m3 11m7 18.1'' 296° 2019
AD 7m3 8m3 28.3'' 122° 2019
AE 7m3 9m0 42.6'' 188° 2019
DH 8m3 10m0 54.0'' 111° 2019
René Merting
Drachhausen (Germany)
18x70 AD: Komponente D ist mit etwas Abstand östlich von Komponente A zu erkennen
AE: Komponente E ist schwächer als D und steht südöstlich von A in doppeltem Abstand wie AD
DH: Komponente H ist noch schwächer als D und steht östlich in dreifachem Abstand wie AD
Robert Zebahl
Leipzig (Germany)
70mm (100x) AB: Well split with obvious difference in brightness.
Christopher Hay
Seeheim (Germany)
125mm (100x) AB: When idly viewing NGC 2169, the “37 Cluster” or “IC37”, I noticed that the brightest star in the 37, namely the one at the NW corner of the 3, is a nicely split double with a thin slice of darkness between the components. PA matches the top bar of the figure-3 well. Stelledoppie lists components of STF848 from A to K, but notes that all are either not physical or uncertain. To my eye only the A-B pair appears double-like.
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: The "37" cluster. This pair is the star at the tip of the upper part of the three where it turns down to the center. Fine white pair, close but nicely split, two delta mag, busy field
Mark McCarthy
Fremont (California/USA)
317mm (170x) AB: Close bluish pair near the center of the open cluster NGC 2169
AG323 AB 9m0 10m2 1.8'' 49° 2015 Gem 06h19m45.23s +22°06'38.80"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Wow! pops with seeing, 1 delta mag, ~2". Very nice. Two other stars much fainter on the outer reaches likely part of system [these are AC and AD]
STF900, epsilon Mon, 8 Mon AB 4m4 6m6 12.2'' 30° 2019 Mon 06h23m46.10s +04°35'34.20"
Robert Zebahl
Leipzig (Germany)
55mm (42x) Relatively large distance and clear difference in brightness. The lighter component seemed white-yellowish, the weaker one slightly greenish-blue. The color contrast, however, was not particularly conspicuous.
Uwe Pilz
Leipzig (Germany)
105mm (288x) Blau-rot ../projects/double-stars/uwe-pilz/sketches/epsMon.jpg
★★★ beta Mon, 11 Mon STF919 AB 4m6 5m0 7.1'' 133° 2019 Mon 06h28m49.07s -07°01'59.00"
STF919 AC 4m6 5m4 9.9'' 126° 2019
STF919 BC 5m0 5m3 3.0'' 109° 2019
BU570 AD 4m6 12m1 26.5'' 56° 2014
René Merting
Drachhausen (Germany)
18x70 das Mehrfachsystem ist als 8 erkennbar, eine extrem knappe Berührung, wobei die Komponenten B und C im SO nur als ein Stern gesehen werden können - BC ist gleich hell wie A allein
René Merting
Drachhausen (Germany)
100mm (32x) A-BC: bei 32x ein wunderschöner eng stehender Doppelstern - die bei dieser Vergrößerung noch nicht trennbare Komponenten B und C im SO wirken leicht gelblich und ist leicht heller als A - die Komponenten A und BC wollen sich berühren, schaffen es aber nicht ;-)
BC: bei 64x wirkt BC leicht länglich wie ein Stäbchen - bei 107x dann der Aha-Effekt, es sind zwei Sterne, knapp getrennt und mit gleichem Positionswinkel wie A-BC - beide Komponenten B und C sind gleich hell und einzeln jeweils etwa eine halbe Größenklasse schwächer als A im NW
Uwe Pilz
Leipzig (Germany)
105mm (137x) Dreifachsystem, drei fast gleichhelle Sterne. Alle blau-weiß ../projects/double-stars/uwe-pilz/sketches/betaMon.jpg
STTA77, nu Gem, 18 Gem AB 4m1 8m0 112.8'' 330° 2015 Gem 06h28m57.79s +20°12'43.80"
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. AB are wide apart. Large brightness difference. A pure white, B possibly slightly blue.
A physical double at a distance to us of 545 light years.
FAB5 & STF926 FAB5 Aa-Ab 7m2 9m6 0.9'' 18° 1991 Mon 06h31m40.54s +05°46'08.80"
STF926 AB 7m2 8m6 10.8'' 287° 2017
Mark McCarthy
Fremont (California/USA)
317mm (170x) STF926 (AB): In a triangle of stars which points toward the Rosette Nebula. Blue-white A star and slightly red B, 1 delta mag, wide. The A star is FAB 5
Mark McCarthy
Fremont (California/USA)
317mm (553x) FAB5 (Aa-Ab): Misshapen disk at best moments, very difficult
★★ STF924, 20 Gem AB 6m3 6m9 19.9'' 212° 2019 Gem 06h32m18.52s +17°47'03.40"
BC 6m9 13m0 47.8'' 144° 2014
Robert Zebahl
Leipzig (Germany)
16x70 AB: 2021-02-22: Easy to separate with small difference in brightness. Conspicuous double star. White-yellowish & white-bluish.
René Merting
Drachhausen (Germany)
18x70 AB: das dicht stehende Paar fällt sofort ins Auge - Komponente A im Norden ist vielleicht eine halbe Magnitude heller als Komponente B, die leicht gräulich strahlt
Robert Zebahl
Leipzig (Germany)
70mm (22x) AB: At 22x bright, immediately conspicuous, although in a relatively star-rich surrounding. Moderate but beautiful color contrast: bright orange, subtle blue. Also at 44x very beautiful sight.
Robert Zebahl
Leipzig (Germany)
152mm (69x) AB: Easy, bright, moderately uneven. Nice contrast in color: slight orange, white-bluish.
★★ STT147 AB 6m8 8m7 42.7'' 74° 2016 Aur 06h34m19.37s +38°04'33.60"
A-CD 6m8 9m8 44.5'' 119° 2016
CD 10m6 11m0 0.5'' 109° 1957
Uwe Pilz
Leipzig (Germany)
105mm (200x) ../projects/double-stars/uwe-pilz/sketches/200123stt147.jpg
Robert Zebahl
Leipzig (Germany)
152mm (69x) At 22x, the components A, B and CD are immediately conspicuous, where A dominates. They form a beautiful, acute-angled triangle. At 69x, color differences are also visible. A: subtle orange; B: grey-bluish; CD: tendency to orange. Rewarding, because the double stars STF 928 & STF 929 as well as the very conspicuous carbon star UU Aur are in close proximity and can partly be observed together in one field of view!
★★ STF928 AB 7m9 8m6 3.4'' 131° 2019 Aur 06h34m41.81s +38°32'24.50"
AC 7m9 12m4 130.9'' 124° 2002
BC 8m6 12m4 127.3'' 124° 2015
Robert Zebahl
Leipzig (Germany)
102mm (62x) AB: At 28x the double star already appeared elongated, at 62x beautifully separated, with component A shining in a warm, subtle orange. At 125x A appeared orange, B grey-bluish.
Uwe Pilz
Leipzig (Germany)
105mm (200x) AB: kühl-weiß und lila ../projects/double-stars/uwe-pilz/sketches/200123stf928.jpg
Robert Zebahl
Leipzig (Germany)
152mm (69x) AB: Clearly separated, but tight. Moderate difference in brightness. Nice view with the nearby double stars STT147 & STF 929 and the carbon star UU Aur!
STF929 7m3 8m4 6.5'' 24° 2016 Aur 06h35m22.03s +37°42'55.10"
Robert Zebahl
Leipzig (Germany)
152mm (69x) Easy to separate, clear difference in brightness, slight color contrast. Primary component showed a slight orange color, the color of the companion was not clearly defineable. Nice view with the nearby double stars STT147 & STF 928 and the carbon star UU Aur!
SHJ73, nu 1 CMa 5m8 7m4 17.4'' 265° 2019 CMa 06h36m22.85s -18°39'35.60"
Christopher Hay
Seeheim (Germany)
10x56 On tripod. Finely split. Attractive 6.3° field of view together with Nu2 and Nu3.
A physical double at a distance to us of 351 light years.
STF941 AB 7m2 8m2 2.0'' 83° 2019 Aur 06h38m40.76s +41°34'53.40"
AC 7m2 10m5 83.9'' 135° 2015
Robert Zebahl
Leipzig (Germany)
102mm (28x) AC: Distant, faint companion that is less attracting attention. Used magnifications between 28x and 125x.
Robert Zebahl
Leipzig (Germany)
102mm (86x) AB: At 62x only visible as figure '8'. The difference in brightness is hardly noticeable. At 86x barely separated, obvious. Clearly separated at 125x, but still tight with a moderate brightness difference.
★★ STF946 7m3 9m1 4.0'' 129° 2019 Lyn 06h44m51.62s +59°26'57.40"
Robert Zebahl
Leipzig (Germany)
102mm (86x) Easy to split with noticeable difference in brightness. Very nice view together with the triple system STF 948 in one field of view! ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf946_stf948.jpg
Uwe Pilz
Leipzig (Germany)
105mm (88x) im selben Feld mit 12 Lyn ../projects/double-stars/uwe-pilz/sketches/200409_12lynstf946.jpg
Robert Zebahl
Leipzig (Germany)
152mm (100x) At 100x and 129x easy to separate, quite uneven. Primary component appeared yellowish, the fainter one rather greyish. Fantastic view together with 12 Lyn (STF 948) in one field of view!
★★★ AGC1, 9 CMa, alpha CMa, Sirius AB -1m5 8m4 10.7'' 75° 2016 CMa 06h45m08.92s -16°42'58.00"

../images/binary-star-orbits/AGC1-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (198x) mit ADV, ohne nicht trennbar. Eindeutig
Robert Zebahl
Leipzig (Germany)
120mm (150x) 2021-03-02: Used magnifications from 86x to 200x using a Baader yellow filter. The diffraction disk was relatively good visible, but the diffraction rings were noticeably in movement (Seeing 3/5).
Jörg S. Schlimmer
Germany
127mm (136x) not split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Sirius_Refraktor_2021_03_07_bear_filtered_96dpi.jpg
Mark McCarthy
Fremont (California/USA)
203mm (368x) Small disk formed on diffraction spike at correct separation and PA (Feb. 2016)
Mark McCarthy
Fremont (California/USA)
317mm (443x) A faint yellow-orange disk, to the edge of Sirius A's diffraction and just below my spider's diffraction spike. I let Sirius pass beyond the field stop, and for an instant there was Sirius B, clearly separated, before it too passed beyond the field stop.
Jörg S. Schlimmer
Germany
305mm hard to split with CMOS Camera ../projects/double-stars/joerg-schlimmer/photographs/Sirius_20210224_res_best45_bear.jpg
COU472 11m4 11m3 1.9'' 83° 2015 Gem 06h46m07.21s +22°33'06.80"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Faint but very fine pair, really pretty in the field, a little blue, half delta mag, ~1.5" Nice
★★★ STF948, 12 Lyn AB 5m4 6m0 1.9'' 64° 2019 Lyn 06h46m14.15s +59°26'30.10"
AC 5m4 7m0 8.9'' 309° 2019

../images/binary-star-orbits/STF948-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
55mm (27x) AC: Components A/B and C well separated, but tight. Significant difference in brightness. The fainter C companion appeared slightly orange, the brighter one white-bluish.
Robert Zebahl
Leipzig (Germany)
55mm (167x) AB: Components A and B separated, whereby the Airy disks slightly overlap. The difference in brightness was well visible. ../projects/double-stars/robert-zebahl/sketches/2019-01-21_stf948.jpg
Robert Zebahl
Leipzig (Germany)
63mm (140x) AB: Components A and B split with almost no space in between. The difference in brightness was visible. ../projects/double-stars/robert-zebahl/sketches/2019-01-22_stf948.jpg
Robert Zebahl
Leipzig (Germany)
70mm (22x) AC: Well split, relatively close together with significant difference in brightness.
Robert Zebahl
Leipzig (Germany)
70mm (133x) AB: Both components A + B clearly split, whereby the diffraction rings where merged together. A very nice view together with component C. I sketched this triplet, which reflects my impression well. Unfortunately, the distance and position angle are not particularly well observed. Also the difference in brightness I didn't noticed during my observation. ../projects/double-stars/robert-zebahl/sketches/2019-01-20_stf948.jpg
Robert Zebahl
Leipzig (Germany)
102mm (129x) At 28x the pair AC is nicely separated without any problems. The close pair AB is already recognizable at 86x as a clear figure '8', at 125x wonderfully separated. The components A & B appear yellowish. Very nice view together with STF 946 in one field of view! ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf946_stf948.jpg
Uwe Pilz
Leipzig (Germany)
105mm (88x) im selben Feld mit STF 946 ../projects/double-stars/uwe-pilz/sketches/200409_12lynstf946.jpg
Robert Zebahl
Leipzig (Germany)
152mm (129x) At 49x the pair AC is beautifully separated with a significant difference in brightness. At 100x, the close pair AB is also separated, although still very close together. A slight difference in brightness is noticeable. At 129x, the view is magnificent. The two bright components A & B present themselves yellowish, the fainter component C rather greyish. STF 948 can be well observed in a field of view with the neighbouring double star STF 946. Both show a nice overall scenery.
HO238 8m9 9m1 0.3'' 174° 2013 Gem 06h46m20.91s +18°12'08.20"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Barely hairline split at best moments, but conditions have a lot of haze and bloating. A half delta mag is noticeable. I can tell the star is a pair at 333x, but no where near resolvable
STF958 AB 6m3 6m3 4.5'' 77° 2019 Lyn 06h48m12.29s +55°42'15.10"

../images/binary-star-orbits/STF958-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (33x) Clearly split, equally bright, close together. Nice view.
Robert Zebahl
Leipzig (Germany)
102mm (62x) Very nicely split. Both components appear similarly bright and white-yellowish.
H5 108 A-BC 5m8 7m7 42.7'' 66° 2015 CMa 06h50m23.34s -31°42'21.80"
Christopher Hay
Seeheim (Germany)
10x56 On tripod. A-BC wide apart. Only 3° above my horizon shortly after meridian passage. A pulsates mysteriously in the flat air, while Kappa CMa 1° to the south, at the southern fringe of the constellation, pulsates equally mysteriously in a slightly shifted tact.
H5 108 is a physical double at a distance to us of 650 light years.
STF982, 38 Gem AB 4m8 7m8 7.3'' 145° 2018 Gem 06h54m38.63s +13°10'40.10"

../images/binary-star-orbits/STF982-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
55mm (27x) At 27x pretty tight with much fainter component. At 71x clearly separated with clear difference in brightness. Brighter component appeared slightly yellowish, the weaker one slightly bluish.
Robert Zebahl
Leipzig (Germany)
70mm (33x) Easy to separated with noticeable difference in brightness. The fainter component appeared slightly orange, the brighter one rather white.
Uwe Pilz
Leipzig (Germany)
105mm (130x) recht attraktiv
Mark McCarthy
Fremont (California/USA)
203mm (333x) 38 Gem. Light yellow A and blue B, quite wide, very pretty. AC much wider separation much fainter not noticed
Mark McCarthy
Fremont (California/USA)
317mm (553x) Bright orange and slightly red star, 2-3 delta mag.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty yellow and orange, 2 delta mag, wide separation
A2459 AB 9m8 9m8 0.4'' 274° 2008 Gem 06h57m39.64s +19°35'04.10"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Notched near equal at best moments
★★ STTA80 AB 7m2 7m4 124.1'' 53° 2015 Gem 06h58m06.59s +14°13'43.40"
AC 7m2 8m4 81.2'' 112° 2015
Christopher Hay
Seeheim (Germany)
7x45 Handheld. AB are a well separated, matching pair. Immediately striking in field.
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. AB are a widely separated pair, and joined by a third, weaker, point of light, which is C, well separated. A charming little triangle.
Involved in (or making up?) Monti 4 asterism.
Robert Zebahl
Leipzig (Germany)
70mm (22x) All 3 components form a striking triangle and are slightly different in color. A (western component): white-bluish; B (northern component): white-yellowish; C (southern component): orange, partly slightly reddish. ../projects/double-stars/robert-zebahl/sketches/2019-12-18_stta80.jpg
CPO7, eps CMa 1m5 7m5 7.9'' 162° 2008 CMa 06h58m37.55s -28°58'19.50"
Mark McCarthy
Fremont (California/USA)
203mm (113x) Adhara, epsilon Canis Majoris: Wow! Bright (+1.5 magnitude) and large A with small and much fainter close B (magnitude +7.5) to the south. Lovely double
★★ STF1007 AB 7m4 11m4 14.6'' 300° 2015 Gem 07h00m37.12s +12°43'24.20"
AC 7m4 10m0 21.9'' 244° 2015
AD 7m4 7m7 67.7'' 28° 2016
Christopher Hay
Seeheim (Germany)
7x45 AD: Handheld. Stands out immediately as double with clear PA in field of several similarly bright single stars. Unsupported, hand tremor prevents actually seeing each component singly, but by bracing arms in reclining chair the well-matched pair is clearly split.
A physical double at a distance to us of 914 light years.
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. AD well split. A is distinctly brighter and seems bluish. Nice in 4.5° FOV together with STTA80 ABC.
Robert Zebahl
Leipzig (Germany)
70mm (22x) AD: Wide separation, small difference in brightness. Slight difference in color, but difficult to describe. Component A at least seemed rather white. South of STF1007 there is also the double star HJ3288 and the star HD52976, which appears in a bright orange. Together in one field of view a beautiful sight. ../projects/double-stars/robert-zebahl/sketches/2019-12-18_stf1007_hj3288.jpg
★★ BU100 7m3 11m1 3.2'' 261° 1978 Gem 07h00m56.55s +12°24'00.40"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty orange and blue. 4 delta mag, PA to west. Wide separation ~3" B is just seen, a very fine point.
ARN66 AF 6m6 8m3 172.0'' 301° 2011 Gem 07h01m17.01s +32°24'52.40"
Christopher Hay
Seeheim (Germany)
7x45 Handheld. AF is an immediately striking wide pair. Viewed comfortably in 8.6° FOV together with very wide Rho Gem, a further physical pair.
Arnold 66 AF is a physical double at a distance to us of 462 light years.
HJ3288 7m3 8m7 38.5'' 247° 2015 Gem 07h02m18.43s +12°34'54.20"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Easy to separate with moderate angular distance and a significant difference in brightness. Slight difference in color: white-yellowish, slightly orange. Nice view together with the double star STF1007 and HD52976, which appears in a bright orange. Sketched together with STF1007. ../projects/double-stars/robert-zebahl/sketches/2019-12-18_stf1007_hj3288.jpg
A2462 AB 9m2 9m0 0.2'' 250° 2019 Gem 07h02m37.42s +15°58'26.50"

../images/binary-star-orbits/A2462-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Short period list. Notched, noticeable magnitude difference, B star pointed in direction of apex of right triangle it forms with two other eighth magnitude stars. Light orange stars
HO342 8m0 8m7 1.2'' 89° 2016 Gem 07h02m50.54s +13°05'21.70"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Split when seeing stills. orange A and yellowing B, 1.5-2"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow-orange and blue stars, PA to the east, 1 delta mag, tight but well split ~1".
★★ STF1001 AB 7m8 9m4 9.1'' 66° 2019 Lyn 07h03m05.51s +54°10'26.60"
AC 7m8 9m3 9.9'' 58° 2019
BC 9m4 9m3 1.6'' 2019
Robert Zebahl
Leipzig (Germany)
102mm (160x) 2020-03-23: At 28x the pair A-BC is easy to separate. At 160x, the very close pair BC shows split. The component A appears slightly orange.
Uwe Pilz
Leipzig (Germany)
105mm (88x) ../projects/double-stars/uwe-pilz/sketches/200409stf1001.jpg
Robert Zebahl
Leipzig (Germany)
152mm (129x) 2020-03-23: At 22x, the wide pair A-BC already appears separated, but still very tight. At 69x, A appears in a subtle orange. The pair BC shows elongated and rather greenish-bluish. At 100x BC is already visible as figure '8' and almost separated, at 129x clearly separated. Components B and C are still very close together and equally bright. The color impression remains. An interesting and rewarding triple system! ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf1001.jpg
SHJ77, zeta Gem, 43 Gem, Mekbuda AB 4m0 11m5 87.4'' 85° 2001 Gem 07h04m06.54s +20°34'13.10"
AC 4m0 7m7 100.2'' 347° 2015
AD 4m0 12m5 67.8'' 354° 2008
Christopher Hay
Seeheim (Germany)
15x45 AC: Binoculars with internal stabilisation, handheld. AC are wide apart and a visually strong (though not physical) pair.
★★ STF1014 9m9 9m9 2.0'' 221° 2017 Gem 07h05m44.95s +26°08'25.30"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very faint near equal brightness pair, ~3", PS to the SW.
★★★ ENG28 AB 7m9 7m7 171.9'' 99° 2015 Gem 07h08m00.24s +15°31'42.90"
Christopher Hay
Seeheim (Germany)
7x45 Handheld. Widely split matched pair. Easy to find half a degree south of 45 Gem. Comfortably viewed in 8.6° FOV together with STTA 80 AB and STF 1007, all three systems well-to-wide split, a charming trio of doubles. Alternatively, ENG 28 can also be viewed together with Zeta Gem (Mekbuda) 5° to the north.
Engelmann 28 is a physical double at a distance to us of 152 light years.
There is an interesting quirk about the ENG designation, on which Stelledoppie notes: Some time after publication of the IDS, the designation for Engelmann was changed from EN to ENG and that for Engelhardt from ENG to ENH. This has led to considerable confusion between the two.
Mark McCarthy
Fremont (California/USA)
80mm (13x) Pretty, wide equal finder split, white, nice field.
★★ 145 CMa, Winter Albireo HJ3945, Winter Albireo AB 5m0 5m8 26.5'' 50° 2020 CMa 07h16m36.84s -23°18'56.10"
SHY508 BC 5m8 6m8 999.9'' 165° 1999
Christopher Hay
Seeheim (Germany)
7x45 AB: On tripod. Very tight but definitely split. A tends towards orange. Proximity to A prevents determination of colour of B.
René Merting
Drachhausen (Germany)
8x30 AB: Winter-Albireo - ein eng stehendes Pärchen, ganz knapp getrennt - Komponente A im SW knallig orange, bei B ist schwer eine Farbnuance erkennbar, eher weißlich und deutlich schwächer als A
René Merting
Drachhausen (Germany)
10x50 AB: ein knapp getrenntes Paar (nicht besser als im 8x30) - Komponente A leicht gelblich, B ist kühler, weißlich
Christopher Hay
Seeheim (Germany)
10x56 BC: On tripod. B is set off well from visually distracting A (which in turn is the primary of HJ3945, the Winter Albireo). C seen clearly and well framed in 6.3° field of view with Tau CMa at centre of field.
Shaya 508 BC is a physical double at a distance to us of 303 light years. Reported in E.J. Shaya, R. Olling, 2011: Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue. The C component is more than 3° to the south of the B component. Coordinates of C component (= HD 35578) are RA 07h20m32.5s, DEC -26°42'01".
Christopher Hay
Seeheim (Germany)
10x56 AB: On tripod. Immediately striking as well-split pair. A flashing orange. Glare and scintillation of A prevent any definite colour impression of B.
René Merting
Drachhausen (Germany)
18x70 AB: ein gut getrenntes Pärchen - Komponente A im Südwesten ist apfelsinenorange, B wirkt anfangs eisblau, bei längerer Betrachtung weißgrau
Christopher Hay
Seeheim (Germany)
42mm (12x) AB: Clean split. Orange and blue.
René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 32x leuchtet Komponente A goldgelb, B im NO wirkt weiß ohne den erwarteten Farbstich, auch nicht bei 107x und auch nicht, wenn ich die Sterne leicht unscharf stelle - trotzdem sehenswert - auch bei 20x zeigen sich beide Sterne ordentlich voneinander getrennt, A strahlt jetzt noch tiefgelber, fast orange
Uwe Pilz
Leipzig (Germany)
105mm (37x) AB: sofort auffallend, blau-orange ../projects/double-stars/uwe-pilz/sketches/hj3945.jpg
Robert Zebahl
Leipzig (Germany)
120mm (23x) AB: Evident, easy to split at large angular distance. Brighter component appeared very orange, fainter one bluish.
STF1081 AB 7m7 8m5 1.9'' 234° 2019 Gem 07h24m08.94s +21°27'28.00"
AC 7m7 9m9 107.0'' 63° 2015
Robert Zebahl
Leipzig (Germany)
102mm (28x) AC: Rather wide apart from component A with noticeable difference in brightness. Less conspicuous.
Robert Zebahl
Leipzig (Germany)
102mm (86x) AB: At 86x just separated, very close together with moderate difference in brightness. In relation to A, the components B & C are almost opposite each other. At 125x, A & B are easy to split.
STF1090 AB 7m3 8m2 60.8'' 98° 2017 Gem 07h26m27.33s +18°31'00.80"
AC 7m3 9m5 49.9'' 79° 2015
BC 8m2 9m5 20.9'' 328° 2015
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. AB are well split. Substantial delta-mag.
A physical double at a distance to us of 366 light years.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AC: Pretty finder split, equal white. Is a 2+1 with 2x fainter BC.
Mark McCarthy
Fremont (California/USA)
317mm (553x) BC: Is a 2+1 with AC, C is 2 delta mag than fainter B.
ES2625 & S548 ES2625 AB 7m0 12m4 11.9'' 24° 2015 Gem 07h27m40.54s +22°08'29.30"
S548 AC 7m0 8m9 35.3'' 277° 2019
Christopher Hay
Seeheim (Germany)
15x45 S548 (AC): Binoculars with internal stabilisation, handheld. Clean split. Secondary very faint. Primary yellowish-orange, a colour impression confirmed (without split) in handheld 7x45. Seen together with Eskimo Nebula (stellar) in 4.5° FOV.
A physical double at a distance to us of 1199 light years.
René Merting
Drachhausen (Germany)
100mm (20x) S548 (AC): bei 32x ein weit getrenntes Paar - Komponente A strahlt schwach gelblich … eher dunkelgelb - Komponente C im Westen von A ist gut 1.5 Magnituden schwächer und dunkelgrau bis lachsorange - der Doppelstern steht isoliert, fällt aber nicht übermäßig auf - zurück auf 20x ist das Paar weiterhin gut getrennt erkennbar
Uwe Pilz
Leipzig (Germany)
105mm (88x) S548 (AC): bei 21x trennbar, orange und fahlblau ../projects/double-stars/uwe-pilz/sketches/210131s548.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) S548 (AC): Orange with a 2x fainter white star, PA slightly SW. AB is 12th mag and not seen
STF1102 AB 7m4 9m2 7.7'' 45° 2015 Gem 07h30m26.25s +13°51'54.00"
AC 7m4 13m2 21.8'' 77° 2015
AD 7m4 8m0 111.9'' 131° 2015
BC 9m2 13m2 15.9'' 91° 2015
BE 9m2 12m0 30.4'' 2015
Christopher Hay
Seeheim (Germany)
7x45 AD: Handheld. Clear, almost wide, split. Component A distinctly brighter.
A physical double at a distance to us of 148 light years.
Christopher Hay
Seeheim (Germany)
15x45 AD: Binoculars with internal stabilisation, handheld. Wide split. A visually strong pair.
★★★ STF1110, alpha Gem, 66 Gem, Castor AB 1m9 3m0 5.5'' 53° 2019 Gem 07h34m35.86s +31°53'17.80"
AC 1m9 9m8 69.8'' 163° 2017
AD 1m9 10m1 179.8'' 221° 2017

../images/binary-star-orbits/STF1110-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
55mm (27x) AB: At 27x slight difference in brightness visible. Double star appeared as '8'. At 38x clearly split, but tight.
Robert Zebahl
Leipzig (Germany)
70mm (44x) AB: At 44x the double star appeared as an '8'. At 100x clearly split with noticeable difference in brightness. Both components appeared white.
Christopher Hay
Seeheim (Germany)
76mm (50x) AB, 18 February 2021: At 23x oval-elongated with clear position of component A. At 50x finely split. At 83x best sight with first diffraction rings slightly overlapping. At 100x nice pattern of the Airy disks and the overlapping first and second diffraction rings of both components.
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 32x wirkt der Stern leicht länglich - bei 107x stehen die beiden Sterne schön eng mit überlagernden Beugungsscheibchen, die Komponenten sind dennoch getrennt erkennbar - Komponente B im Osten ist eine halbe Magnitude schwächer - ganz schwacher Farbkontrast
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB: blauweiß-weiß ../projects/double-stars/uwe-pilz/sketches/Castor.jpg
Winfried Kräling
Marburg (Germany)
127mm (250x) AB: 13.03.2017: Beide Komponenten gelblich mit geringem Helligkeitsunterschied, bereits bei V=60x getrennt. ../projects/double-stars/winfried-kraeling/sketches/170313_02_alpha%20Gem_Castor.jpg
Christopher Hay
Seeheim (Germany)
180mm (200x) AB: Two fat spotlights in space. Component B seems greenish at first sight (using a first-class reflector free of chromatic aberration), and certainly has a different hue than component A. The second diffraction rings of A and B meet.
★★ STF1121 AB 6m9 7m3 7.4'' 306° 2019 Pup 07h36m36.06s -14°29'03.70"
Robert Zebahl
Leipzig (Germany)
152mm (30x) Fantastic view of the double star in the middle of the beautiful star cluster Messier 47! Bright, moderate separation with little difference in brightness.
★★ BRD2 AB 9m2 9m5 0.9'' 188° 2015 CMi 07h39m46.65s +05°16'25.50"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Wow! Exceptionally fine pair, white, near equal, nicely split, just outside of Procyon's glare. Great! [AB,C 14th mag not seen]
★★ STF1126 AB 6m5 7m0 0.9'' 176° 2019 CMi 07h40m06.99s +05°13'51.90"

../images/binary-star-orbits/STF1126-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (288x) beide gelb. Es war schwierig, die hellere Komponente zu erkennen. Direkt neben Prokyon. ../projects/double-stars/uwe-pilz/sketches/210330STF1126.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wow, very close <1" hair-split, near equal brightness
STF1122 7m8 7m8 14.4'' 185° 2017 Cam 07h45m52.47s +65°09'28.10"
Robert Zebahl
Leipzig (Germany)
70mm (31x) 2020-05-15: At 22x immediately apparent with a beautiful separation between the equally bright components. One component appeared slightly bluish, the other light orange. At 44x the subtle color difference can be seen a bit better. The double star is in a nice star field together with 51 Cam. ../projects/double-stars/robert-zebahl/sketches/2020-04-15_stf1122.jpg
René Merting
Drachhausen (Germany)
320mm (45x) bei 72x ein gut getrenntes Pärchen zweier gleich heller Sterne - trotz vieler gleich heller Sterne im Gesichtsfeld wirkt das Doppel gut isoliert
★★ STF1127 AB 7m0 8m4 5.6'' 340° 2019 Cam 07h47m00.43s +64°03'07.30"
AC 7m0 9m7 11.6'' 178° 2019
BC 8m4 9m7 16.9'' 173° 2019
Robert Zebahl
Leipzig (Germany)
70mm (57x) 2020-04-15: At 31x all three components are visible, with B still very close to component A. Component C is rather dim overall. At 57x, A appears white-yellowish, B slightly orange. ../projects/double-stars/robert-zebahl/sketches/2020-04-15_stf1127.jpg
René Merting
Drachhausen (Germany)
320mm (45x) AB: bei 45x ist B ganz dicht nördlich an A angrenzend erkennbar (knapp getrennt), B etwas heller als C im Süden - bei 72x wird die Trennung einfacher und alle drei Sterne stehen fast auf einer Linie
AC: bei 45x ist C ganz schwach südlich von A erkennbar - bei 72x schätze ich, etwas mehr als die doppelte Entfernung AB, C wirkt grau, während A und B weiß strahlen
COU926 9m5 9m7 0.3'' 254° 2008 Gem 07h50m38.16s +19°44'04.20"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Very tentative notched, noticable mag difference, only with seeing. Can't go to higher mag due to seeing
STTA89 6m8 7m7 76.6'' 84° 2017 Gem 07h51m00.20s +31°36'48.70"
Christopher Hay
Seeheim (Germany)
7x45 Handheld. Clearly split. Primary distinctly brighter. Rather charming in 8.6° FOV together with Castor and Pollux, with which it forms an almost equilateral triangle.
A physical double at a distance to us of 660 light years.
Robert Zebahl
Leipzig (Germany)
70mm (22x) At 22x widely separated with moderate difference in brightness. The primary component appeared whitish, at 44x rather white-yellowish. The companion appeared slightly orange.
BU101, 9 Pup 5m6 6m5 0.4'' 307° 2019 Pup 07h51m46.31s -13°53'52.80"

../images/binary-star-orbits/BU101-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) 9 Pup. Elongated to notched, orientation correct, light orange. Very tough. [B is coming off it's furthest orbit and will be exceptionally difficult in 10 years, but easier in 15 years]
STT185 7m1 7m3 0.4'' 21° 2019 CMi 07h57m16.39s +01°07'37.30"

../images/binary-star-orbits/STT185-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Without the apodizing mask I get a clean split with seeing but constant split with the mask. Light orange stars, noticeable mag difference
BU581 AB 8m5 8m8 0.4'' 226° 2018 Cnc 08h04m23.10s +12°17'23.80"

../images/binary-star-orbits/BU581-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Light orange near equal, very small, elongated to notched.
Mark McCarthy
Fremont (California/USA)
508mm (1067x) With apodizing mask. Beautiful clean split, almost wide, light orange stars, slight mag difference. There is a third 2x fainter star further out, might be plus one. Wow. [3rd is AB-C, 8.46/11.78 5.5"]
★★ STF1177, 17 Cnc 6m7 7m4 3.5'' 350° 2019 Cnc 08h05m37.06s +27°31'46.90"
Robert Zebahl
Leipzig (Germany)
70mm (57x) Easy to separate, but still relatively close together. Well visible difference in brightness. Color of the components was not clearly visible. Nice view overall.
René Merting
Drachhausen (Germany)
100mm (64x) bei 107x sehe ich ein knapp getrenntes schön eng stehendes Pärchen - Komponente B im Norden ist eine dreiviertel Größenklasse schwächer - das Weiß von A wirkt kühler - zurück auf 64x sehe ich eine Ameise mit dünnem Hals, in ruhigen Momenten zeigen sich beide Sterne sogar getrennt
Uwe Pilz
Leipzig (Germany)
105mm (144x) ../projects/double-stars/uwe-pilz/sketches/200303stf1177.jpg
Uwe Pilz
Leipzig (Germany)
105mm (180x) Blau und Orange - sehr schöner Farbkontrast, unterstützt durch die ähnliche Helligkeit ../projects/double-stars/uwe-pilz/sketches/210330STF1177.jpg
Christopher Hay
Seeheim (Germany)
125mm (160x) Well split despite substantial turbulence in the atmosphere. Main component creamy yellow-white, companion pale blue. A very attractive colour contrast warranting a one-star rating.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF1177.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellowish, 1 delta mag, ~4"
Karsten Kopp
Köln (Germany)
600mm (180x) Gut zu trennender Doppelstern, mit gut erkennbaren Helligkeitsunterschied . Der hellere Stern leuchter weiß-gelblich, während der schwächere leicht bläulich schimmert. Schöner Farbkontrast
★★★ zeta Cnc, 16 Cnc STF1196 AC 5m3 5m8 6.2'' 62° 2020 Cnc 08h12m12.79s +17°38'51.20"
STF1196 AB-C 4m9 5m8 6.0'' 64° 2020
STF1196 AB 5m3 6m2 1.0'' 2020
HUT1 Ca-Cb 6m2 7m1 0.3'' 32° 2019

../images/binary-star-orbits/STF1196-AB-C-orbit.jpg ../images/binary-star-orbits/STF1196-AB-orbit.jpg ../images/binary-star-orbits/HUT1-Ca-Cb-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (133x) The wide pair AB-C is already separable at 22x. The pair AB shows at 133x two clearly overlapping diffraction disks with small difference in brightness, but without any notch. ../projects/double-stars/robert-zebahl/sketches/2020-03-24_stf1196.jpg
Christopher Hay
Seeheim (Germany)
71mm (32x) AB-C: Finely split. AB yellowish. Substantial delta-mag.
Robert Zebahl
Leipzig (Germany)
102mm (86x) AB-C: Easy to separate. A: light grey, B: pale orange.
Stefan Loibl
Rosenheim (Germany)
102mm (164x) AB-C clearly split, AB obviously elongated but not split
Uwe Pilz
Leipzig (Germany)
105mm (288x) weißblau-gelb-gelb ../projects/double-stars/uwe-pilz/sketches/zetaCnc.jpg
Robert Zebahl
Leipzig (Germany)
120mm (67x) AB-C: Evident difference in brightness, easy to split. Both components of similar color.
Robert Zebahl
Leipzig (Germany)
120mm (200x) AB: Very tight. The Airy disks were still touching. Slight difference in brightness. Extremely beautiful triple star! ../projects/double-stars/robert-zebahl/sketches/2019-02-24_stf1196.jpg
Winfried Kräling
Marburg (Germany)
127mm (250x) 08.04.2018: Sehr schön, 3-fach Stern, A = weißgelb, B = weißgelb, C = weißgelb ../projects/double-stars/winfried-kraeling/sketches/180408_02_Zeta%20Cnc.jpg
Sarah Gebauer
Germany
150mm (83x) AB-C: bei 83x sind AB-C sauber getrennt, laut Atlas 2020 6,1'' Abstand, die Komponenten A und B mit 1,1'' lassen sich nicht trennen, viele schöne Feldsterne dabei ../projects/double-stars/sarah-gebauer/sketches/20200411%20Zeta%20Cnc%20DSk.jpg
Christopher Hay
Seeheim (Germany)
180mm (200x) AB: Hair-fine split. A and B both yellowish-white. C wide from AB, bluish-white, nice colour contrast to AB.
Frederik Wanink
Itterbeck (Germany)
254mm (200x) AB-C: AB (1,1") nicht bemerkt ../projects/double-stars/frederik-wanink/sketches/STF1196.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Ca-Cb: not quite round, oval/olive shaped. It is the AB-C of STF 1196.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Triple, all near equal magnitude, yellow-white. AB ~0.8", hair split.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AC: Triple, all near equal magnitude, yellow-white. AC ~6", wide split.
Karsten Kopp
Köln (Germany)
600mm (257x) AB: Die Komponenten AB-C bei etwas größerem Helligkeitsunterschied einfach zu trennen und auch schön anzusehen. Sterne erstrahlen weißlich gelb. Komponente AB war nicht zu trennen.
★★ STF1193 AB 6m2 9m7 42.4'' 90° 2015 UMa 08h20m40.32s +72°24'26.00"
BC 9m8 12m7 58.8'' 2015
Robert Zebahl
Leipzig (Germany)
70mm (22x) AB: 2020-04-21: Beautifully separated with much fainter companion. The primary component shines in a bright, refreshing yellow. Rewarding!
René Merting
Drachhausen (Germany)
320mm (45x) AB: bei 45x … oh wow, was für eine Farbe bei Komponente A - so ein intensives Gelb habe ich noch nirgends gesehen, gleißendes Rapsgelb - die deutlich schwächere Komponente B im Osten in weitem Abstand ist bei der Farbe von A eher uninteressant, B ist ohnehin nur grau schimmernd
★★ STF1224, 24 Cnc A-BC 6m9 7m5 5.7'' 53° 2019 Cnc 08h26m39.82s +24°32'03.70"
Uwe Pilz
Leipzig (Germany)
105mm (128x) fahlviolett und gelb ../projects/double-stars/uwe-pilz/sketches/210330STF1224.jpg
★★ STF1223, phi 2 Cnc 6m2 6m2 5.2'' 219° 2019 Cnc 08h26m47.08s +26°56'07.80"
Christopher Hay
Seeheim (Germany)
25x80 Hair-fine, but definite and constantly held split. Charming in 3.3° FOV with Phi1 and Chi Cnc.
Easier than I would have thought at only 25x. This is clearly aided by the very well-matched brightnesses of the components. The 70% full moon nearby in Leo also helps, as its brightness boosts the eyes' acuity. During the observation I gaze intentionally directly into the moon at intervals in order to utilise this effect, a technique honed in earlier binocular observations of planets.
Primary is slightly brighter than the secondary, again surprising considering that delta-mag is only 0m05 (6m16 to 6m21 according to Stelledoppie). Not a physical pair, alas, although it looks so much like one.
Uwe Pilz
Leipzig (Germany)
105mm (28x) weiß und gelb ../projects/double-stars/uwe-pilz/sketches/210330Phi2Cnc.jpg
Uwe Pilz
Leipzig (Germany)
105mm (88x) sehr schön, blauweiß-gelbweiß ../projects/double-stars/uwe-pilz/sketches/stf1223.jpg
Karsten Kopp
Köln (Germany)
600mm (180x) Schöner und einfach zu trennender Doppelstern, wo beide Sterne dieselbe Helligkeit haben und weißlich strahlen. Wie ein Augenpaar im All
A551, LO Hya AB 7m0 7m1 0.4'' 63° 2018 Hya 08h28m29.16s -02°31'01.60"

../images/binary-star-orbits/A551-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) LO Hya. With apodizing mask. Easy split, noticeable half delta mag. Another fainter star further out likely +1 [The +1 is STF 1233 AB-C, 6.42/10.49 18.3". AB at furthest extent of orbit, will tighten considerably the next 20 years]
★★ STF1245 AB 6m0 7m2 10.0'' 25° 2019 Cnc 08h35m51.05s +06°37'13.90"
AC 6m0 10m7 100.4'' 109° 2017
AD 6m0 11m9 110.3'' 292° 2017
AE 6m0 9m6 114.8'' 207° 2017
Robert Zebahl
Leipzig (Germany)
70mm (57x) AB at 22x separated, but very close, uneven pair. A appeared white-yellowish, B orange, partly reddish. Opposite in a wide separation the fainter component E was visible. At 57x, A appeared white-yellowish, B orange. ../projects/double-stars/robert-zebahl/sketches/2020-03-24_stf1245.jpg
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x ein sehr enges Pärchen, gerade so getrennt - das Sternpaar ist heller, als viele andere Sterne in der unmittelbaren Umgebung, dadurch ist es sehr auffällig - Komponente A strahlt reinweiß, B steht dem in nichts nach, auch wenn die Komponente gut eine Magnitude schwächer ist
Sarah Gebauer
Germany
100mm (45x) AB: schmal, aber deutlich getrennt, die südliche Komponente sichtbar heller, die nordöstliche schwächer
Uwe Pilz
Leipzig (Germany)
105mm (88x) AB ../projects/double-stars/uwe-pilz/sketches/200323STF1245.jpg
Mark McCarthy
Fremont (California/USA)
508mm (533x) AB: Wide and bright pair, light yellow and orange, easy, slight mag difference
Karsten Kopp
Köln (Germany)
600mm (180x) AB: Schöner und einfacher Doppelstern, wobei die Komponente A weißlich gelb und Komponente B gelblich orange leuchtet. Das Sternfeld in direkter Umgebung rundet den schönen Eindruck ab. ../projects/double-stars/karsten-kopp/sketches/STF1245.jpg
★★ STF1254 AB 6m4 10m4 20.8'' 55° 2017 Cnc 08h40m22.11s +19°40'11.90"
AC 6m5 7m6 62.5'' 343° 2018
AD 6m5 9m2 83.5'' 44° 2017
Stefan Loibl
Rosenheim (Germany)
102mm (164x) septuple, visual quintuple, components A, B, C, and D split, E not visible, B not split, no colour contrast, at northern edge of Messier 44 (Praesepe)
CBL32 7m4 10m7 41.0'' 174° 2015 Cnc 08h46m14.32s +27°35'41.30"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty yellow-orange 8th magnitude primary, with 3x fainter blue which can be seen direct vision but blinks like a planetary nebula, so must be 11-12th mag. Wide separation.
★★ STF1268, iota Cnc, 48 Cnc 4m1 6m0 30.7'' 308° 2018 Cnc 08h46m41.82s +28°45'35.60"
Christopher Hay
Seeheim (Germany)
10x42 Binoculars with internal stabilisation, handheld. Secondary a pinprick of light directly next to the overpowering primary. Slightly uncertain, but PA as seen confirmed afterwards in database. In stabilised 15x45 binoculars the pair is well split, primary white tending towards yellow, secondary substantially colder.
A physical double at a distance to us of 331 light years.
Christopher Hay
Seeheim (Germany)
15x60 On tripod. Well split. Primary very pale yellow, secondary very pale blue. A most striking pair.
Robert Zebahl
Leipzig (Germany)
70mm (22x) Striking, widely separated with noticeable difference in brightness. Moderate but beautiful color contrast: white-yellowish and grey-bluish.
Christopher Hay
Seeheim (Germany)
71mm (32x) Compact pair. Yellow, pale blue. Totally dominates 2.2° FOV.
Robert Zebahl
Leipzig (Germany)
102mm (28x) Grand sight! Pretty wide apart and unequal. A: mild orange, B: very nice light blue.
Stefan Loibl
Rosenheim (Germany)
102mm (164x) wide pair with nice colour contrast yellow/blue
Uwe Pilz
Leipzig (Germany)
105mm (28x) fahlblau und gelborange ../projects/double-stars/uwe-pilz/sketches/210330iotaCnc.jpg
Uwe Pilz
Leipzig (Germany)
105mm (144x) gelb-blaugrau ../projects/double-stars/uwe-pilz/sketches/iotaCnc.jpg
Sarah Gebauer
Germany
150mm (125x) bei 83x schon deutlich getrennt, der Farbkontrast ist gut zu sehen, er wird bei 125x noch stärker, ein zartes Blau und Gelb sind zu sehen ../projects/double-stars/sarah-gebauer/sketches/20200411%20i%20Cnc%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Iot Cnc: Pretty orange and pale blue, showpiece object.
★★★ 11 Hya, epsilon Hya SP1 AB 3m5 5m0 0.2'' 241° 2018 Hya 08h46m46.51s +06°25'07.70"
STF1273 AB-C 3m5 6m7 2.9'' 311° 2020
STF1273 AB-D 3m5 12m5 18.1'' 201° 2017
STF1273 AB-E 3m5 10m8 340.5'' 2015
STF1273 AB-F 3m5 10m4 406.5'' 265° 2015

../images/binary-star-orbits/SP1-AB-orbit.jpg ../images/binary-star-orbits/STF1273-AB-C-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (133x) AB-C: Not split. Although a slight brightening was visible in the first diffraction ring, it could also have come from slight coma of the refractor.
Sarah Gebauer
Germany
100mm (200x) AB-C: ist ein heller Stern vom Hydra-Kopf, nicht zu trennen, vermutlich, weil die Komponente AB zu hell strahlt
Robert Zebahl
Leipzig (Germany)
102mm (160x) AB-C: 2020-03-27: The much fainter companion is well visible as an almost round knot directly at the diffraction ring of the primary component. Very nice sight. The seeing was mediocre (3/5).
Uwe Pilz
Leipzig (Germany)
105mm (200x) AB-C: bei 144x schwierig ../projects/double-stars/uwe-pilz/sketches/200323epsHya.jpg
Robert Zebahl
Leipzig (Germany)
152mm (150x) AB-C: 2020-03-27: The companion is immediately visible as a tiny star close to the primary component. Due to the chromatic aberration of the achromat, there is a slight tendency to outshine. Nevertheless a nice view. The seeing was mediocre (3/5).
Mark McCarthy
Fremont (California/USA)
508mm (533x) AB-C: Epsilon Hya A is bright orange-yellow, B is much fainter and a little blue, ~3". [SP 1 AB is 3.49/5.00 0.2" not seen]
AGC3, rho Hya 4m4 11m9 12.1'' 146° 2015 Hya 08h48m25.98s +05°50'16.40"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Rho Hya Bright white A star and much fainter B star, but it's still a hard bluish point very fine. Nice one
A2550 9m5 9m8 0.4'' 204° 1996 Hya 08h48m35.67s +03°04'05.20"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Wow exceptionally fine pair. B is very faint but can hold direct vision after flashing it out using averted vision. Very close, hairline split, amazing pair. At 1067x the stars dim a little can still see B but need averted vision all the time
A2552 9m1 8m5 0.3'' 208° 2018 Hya 08h48m40.30s +00°56'31.00"

../images/binary-star-orbits/A2552-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (533x) Wow fine split. Pale yellow A and blue B, about one delta mag. Nice split, amazing [82.4 year period]
HJ460, 53 Cnc AB 6m5 11m7 43.7'' 335° 2003 Cnc 08h52m28.60s +28°15'33.00"
AC 6m5 6m0 276.8'' 20° 2011
Christopher Hay
Seeheim (Germany)
7x45 AC: Very wide. C is cold blue, A warmer and weaker.
AC is Rho1 Cnc. C is 55 Cnc, aka Copernicus AB, home to five exoplanets, fairly close to us at a distance of only 41 light years.
Christopher Hay
Seeheim (Germany)
10x42 AC: Binoculars with internal stabilisation, handheld. C is light blue, A brownish-orange. Attractive in 6.5° FOV together with 57 and 61 Cnc and Iota Cnc less than 2° to the west, which is split.
Christopher Hay
Seeheim (Germany)
15x60 AC: On tripod. A wide matching pair. Component A (53 Cnc) seems reddish. Nice together with well-split Iota Cnc in 3.3° FOV.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: 53 Cnc: Orange primary and 2x fainter blue, wide separation (this is AB). There is a second orange-yellow star of about the same magnitude very wide separation (this is AC).
STF1291, 57 Cnc AB 6m1 6m4 1.5'' 310° 2019 Cnc 08h54m14.65s +30°34'45.80"
AB-C 5m5 9m2 54.6'' 204° 2015

../images/binary-star-orbits/STF1291-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (133x) AB: Immediately apparent as a double star. Diffraction disks overlapping slightly ('8'). Difference in brightness visible.
Uwe Pilz
Leipzig (Germany)
105mm (144x) gelb ../projects/double-stars/uwe-pilz/sketches/57Cnc.jpg
Sarah Gebauer
Germany
150mm (125x) AB: sowohl bei 83x als auch bei 125x knapp vorm Trennen
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: 57 Cnc. Very nice pair, strong orange yellow colors, ~1 delta mag, bright, nice close split
SHY204, 62/63 Cnc, omicron Cnc, omicron 1/2 Cnc 5m2 5m7 975.6'' 17° 2015 Cnc 08h57m14.95s +15°19'21.90"
Christopher Hay
Seeheim (Germany)
2x54 Wide apart, Omicron clearly brighter than 63 Cnc. Nice together with Praesepe (M 44) and the Head-of-the-Hydra asterism in 25° FOV.
Shaya 204, comprising Omi Cnc and 63 Cnc, is a physical double at a distance to us of 149 light years. Presumably separable naked-eye if NELM allows, the limiting factor being the 5m7 of 63 Cnc.
Christopher Hay
Seeheim (Germany)
7x45 Super-wide, but still holding together as a pair. Both are bluish-white.
Christopher Hay
Seeheim (Germany)
15x60 On tripod. No particular gain anticipated over 7x45 view, but in fact in the tighter 3.3° FOV the pair is quite charming, the field sprinkled liberally with many fainter stars. Both components (i.e. Omi Cnc and 63 Cnc) have an identical bluish-white hue, very pretty.
★★ BU408 7m3 9m6 2.8'' 345° 2018 UMa 08h59m00.62s +63°25'42.80"
René Merting
Drachhausen (Germany)
100mm (142x) bei 107x ist nordöstlich von A ein Helligkeitspeak erkennbar, aber nicht richtig greifbar - bei 142x dann zeigt sich in ruhigen Momenten die schwächere Komponente knapp abgesetzt von A - großer Helligkeitsunterschied, mindestens 2.5 Größenklassen
Mark McCarthy
Fremont (California/USA)
317mm (553x) BU 408 is the fainter star in a pair pair of near equal stars in finder view, red-orange color. In the scope the B is a blue star 3" out from the orange star.
STF1298, 66 Cnc AB 6m0 8m6 4.4'' 137° 2017 Cnc 09h01m24.13s +32°15'08.30"
AC 6m0 12m0 187.6'' 318° 2015
Robert Zebahl
Leipzig (Germany)
70mm (80x) AB: At 67x and 80x the companion is visible as a very faint star close to the main component. At 133x it is only visible as a slightly blurred tiny star just outside the first diffraction ring of the primary component.
Robert Zebahl
Leipzig (Germany)
102mm (62x) AB: At 62x clearly separated, significant difference in brightness. The companion can be seen well as a faint little star, apart from the primary component. At 125x easy to split. Component A appeared rather white.
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: 66 Cnc. Excellent pair. A is a pure white, B is much fainter and seems red to purple color, nicely separated
A1585, kap UMa 4m2 4m5 0.3'' 278° 2019 UMa 09h03m37.56s +47°09'24.00"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Kappa UMa = Talitha australis: With apodizing mask. Much glare but snowman seen steadily inside the mess. Looks like Eta Carina nebula, with a larger bulge toward us and the smaller bulge pointed up and away. No field stars at this magnification, went down to 533x to notice one for the sketch
★★ STF1306, sigma 2 UMa, 13 UMa AB 4m9 8m8 4.3'' 348° 2016 UMa 09h10m23.53s +67°08'03.30"
AC 4m9 10m3 197.8'' 148° 2003

../images/binary-star-orbits/STF1306-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (100x) AB: Companion almost permanently visible as elongated, non-condensed brightening of the first diffraction ring of the primary component at the correct position angle.
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB: sehr schwierig bei 88x ../projects/double-stars/uwe-pilz/sketches/200316stf1306.jpg
STF3121 AB 7m9 8m0 0.5'' 205° 2017 Cnc 09h17m53.45s +28°33'37.70"

../images/binary-star-orbits/STF3121-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (533x) IP Cnc Split at 533x, used 1067x to recheck orientation. With apodizing mask. Light yellow-orange stars, nice and clean split, very slight mag difference. Real nice
STF1333 6m6 6m7 1.8'' 50° 2018 Lyn 09h18m25.97s +35°21'51.30"
Robert Zebahl
Leipzig (Germany)
63mm (120x) At 93x seen as '8', at 120x split, but pretty tight with no visible difference in brightness.
Christopher Hay
Seeheim (Germany)
71mm (32x) Elongated with clear PA.
Uwe Pilz
Leipzig (Germany)
105mm (200x) fast gleich hell, beide gelblich, bei 66x schwierig ../projects/double-stars/uwe-pilz/sketches/stf1333.jpg
Christopher Hay
Seeheim (Germany)
180mm (113x) Hairfine split, evenly matched pair, rather attractive. No particular colour.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Brilliant white pair, near equal, ~2" separation
STF1334, 38 Lyn AB 3m9 6m1 2.6'' 224° 2019 Lyn 09h18m50.64s +36°48'09.30"

../images/binary-star-orbits/STF1334-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
60mm (198x) Aufhellung im ersten Ring
Robert Zebahl
Leipzig (Germany)
63mm (140x) Fainter companion only seen as permanent brightening on the first diffraction ring. ../projects/double-stars/robert-zebahl/sketches/2019-01-22_stf1334.jpg
Christopher Hay
Seeheim (Germany)
71mm (32x) Figure-8 with clear positions and delta-mags of components. Bluish-white.
Uwe Pilz
Leipzig (Germany)
105mm (288x) gelb, trennbar bei 66x ../projects/double-stars/uwe-pilz/sketches/38Lyn.jpg
Christopher Hay
Seeheim (Germany)
180mm (113x) Clean split, large delta-mag. Separation ca. 1.5 times that of nearby STF1333.
Mark McCarthy
Fremont (California/USA)
317mm (553x) 38 Lyn: Very bright A with 3x fainter dull white B, 3-4"
Mark McCarthy
Fremont (California/USA)
508mm (333x) 38 Lyn. A is a bright light yellow and B is a ~2 delta mag orange-yellow, well split and bright
27 Hya SHJ105 AB 4m9 7m0 229.1'' 211° 2015 Hya 09h20m29.03s -09°33'20.30"
DOO49 BC 7m0 11m0 9.2'' 199° 2015
GUI13 AD 4m9 16m9 122.3'' 227° 2015
Christopher Hay
Seeheim (Germany)
7x45 AB: Handheld. AB wide, very disparate brightnesses. Secondary bluish.
A physical double at a distance to us of 222 light years.
★★ STF1347 7m3 8m3 21.1'' 312° 2016 Hya 09h23m15.76s +03°30'05.00"
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-10: At 22x beautifully separated at moderate separation and difference in brightness. Primary component appeared white-bluish, companion slightly orange. At 44x the primary component looked more white-yellowish, the companion showed a clear tendency to orange.
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x ein auffälliges Sternpaar - Komponente B im Nordwesten ist gut abgesetzt erkennbar und ca. ein 3/4 Größenklasse schwächer - bei 20x rücken die beiden Sterne richtig schön zusammen und sind noch knapp getrennt erkennbar
Uwe Pilz
Leipzig (Germany)
105mm (88x) sehr schöner Farbkontrast ../projects/double-stars/uwe-pilz/sketches/200323STF1347.jpg
★★ STF1348 AB 7m5 7m6 2.0'' 314° 2018 Hya 09h24m28.48s +06°21'01.80"
Robert Zebahl
Leipzig (Germany)
70mm (100x) 2020-04-10: At 67x clearly elongated, at 80x clearly visible as figure '8'. At 100x a very small difference in brightness was to be guessed, at 133x visible. Near the double star STF 1355.
Uwe Pilz
Leipzig (Germany)
105mm (144x) Im selben Aufsuchfeld wie stf1355, ähnliche Erscheinung ../projects/double-stars/uwe-pilz/sketches/200323STF1348_55.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Very pretty half delta mag, ~2" pair, white. Sharp despite low declination
BU105, kappa Leo, 1 Leo AB 4m6 9m7 2.0'' 209° 2015 Leo 09h24m39.28s +26°10'56.80"
AC 4m6 11m1 147.7'' 212° 2015
Uwe Pilz
Leipzig (Germany)
105mm (180x) AB: Begleiter sitzt im ersten Ring
Robert Zebahl
Leipzig (Germany)
152mm (300x) AB: 2020-04-22: The seeing (2-3/5) was not good enough. The diffraction disk was reasonably well visible, but the diffraction rings smudged. No split.
Robert Zebahl
Leipzig (Germany)
152mm (300x) AB: 2020-04-24: Seeing was mediocre (3/5). The faint companion was partly seen as a distinct brightening in the first diffraction ring of the primary component. Not at all easy. Steady air necessary.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Kappa Leonis: Very tough but palpable split. Seeing needed to settle to perfection for primary to resolve to just an airy disk without diffraction or flaring, and for a couple of seconds could see the much fainter ~10th magnitude B star as a pin-point, ~2" separation. Fleeting view.
★★ STT200 6m5 8m6 1.2'' 336° 2019 UMa 09h24m55.67s +51°34'26.10"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Light orange A, B a deeper orange, maybe because it's 2-3x fainter. B resolves from within A's diffraction when seeing settles, ~1". Wow!
★★ STF1355 7m7 7m8 1.8'' 357° 2018 Hya 09h27m16.69s +06°13'59.00"

../images/binary-star-orbits/STF1355-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (100x) 2020-04-10: At 67x clearly elongated, equally bright. At 80x detectable notch. At 100x and 133x clearly visible as figure '8'. Near the double star STF 1348.
Uwe Pilz
Leipzig (Germany)
105mm (144x) Im selben Aufsuchfeld wie stf1348, ähnliche Erscheinung ../projects/double-stars/uwe-pilz/sketches/200323STF1348_55.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Light yellow pair, near equal, very nice, ~2"
HJ1167, tau 1 Hya, 31 Hya 4m6 7m3 67.5'' 2012 Hya 09h29m08.84s -02°46'08.20"
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. Wide, almost exactly north-south oriented. Primary slightly yellowish.
A physical double at a distance to us of only 57 light years.
BU591 7m8 8m9 1.0'' 29° 2017 Hya 09h29m36.43s -03°07'20.40"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Very nice pair. Split with seeing, noticable mag difference, hairline only
STF1349 7m5 9m0 19.2'' 166° 2015 UMa 09h31m09.89s +67°32'28.40"
Christopher Hay
Seeheim (Germany)
60mm (25x) At 25x a wide split, substantial difference in brightness, B a fine pinprick of light. B appears light blue at first, but colour impression disappears quickly - an interesting visual effect repeated several times. According to Stelledoppie a true physical pair. Nice together with Struve 1350 in same FOV. A very fine double-double for very small apertures.
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-19: At 22x easy to separate with significant difference in brightness. The primary component appears whitish, the companion darker. At 44x, the primary component looks rather white-yellowish, the companion greyish.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x stehen beide Sterne bequem getrennt auseinander - Komponente B im Süden ist eine knappe Größenklasse schwächer und kupfergrau - ein schönes Doppel-Doppel zusammen mit STF1350 gut 47' weiter südsüdöstlich
Uwe Pilz
Leipzig (Germany)
105mm (88x) sichtbar bei 21x ../projects/double-stars/uwe-pilz/sketches/200316stf1349.jpg
René Merting
Drachhausen (Germany)
320mm (45x) bei 45x steht das Pärchen gut auseinander - Komponente B ist eine dreiviertel Größenklasse schwächer und wirkt grauweiß - A ist weiß mit einem zarten Stich ins Gelbe
★★ STF1350 AB 8m3 8m3 10.2'' 249° 2015 UMa 09h34m19.56s +66°47'42.30"
AC 8m3 9m2 131.0'' 216° 2015
Christopher Hay
Seeheim (Germany)
60mm (25x) AB: Tight but nicely split at 25x. No colour whatsoever seen. A appears brighter than B, whereby the data do not support this – perhaps a product of different (yet not seen) colouration? According to Stelledoppie not a physical pair. Attractive together with Struve 1349 in same field of view.
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-19: At 22x A & B equally bright and still pretty close together. Component C is visible at a much greater distance. At 44x, A & B show a color difference: orange, white-bluish.
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x ein schönes enges Paar zweier gleich heller Sterne, knapp getrennt - STF1350 AB bildet mit vier ähnlich hellen Sternen westlich ein Muster, ähnlich einer Sense
AC: bei 32x bildet STF1350 AB mit vier ähnlich hellen Sternen westlich ein Muster, ähnlich einer Sense - der erste der vier Sterne bzw. der nächststehende Stern südsüdwestlich mit mehr als zehnfachem Abstand AB ist Komponente C, er ist schätzungsweise eine halbe Größenklasse schwächer
Uwe Pilz
Leipzig (Germany)
105mm (88x) AB: trennbar bei 21x. Fast gleichell, aber deutlicher Farbkontrast, lohnend. ../projects/double-stars/uwe-pilz/sketches/200316stf1350.jpg
Robert Zebahl
Leipzig (Germany)
152mm (100x) At 22x, all three components are already visible, with A & B still standing quite close together. Component C is less prominent. At 69x and 100x, the pair AB shows a nice color contrast: The eastern component mostly appeared in a slightly shiny orange, while the other component appeared more white-bluish. During the observation, however, the colors changed between both components. At the time of observation, the pretty bright comet C/2019 Y4 Atlas was also in the same field of view - a great scene! Note to the sketch: The positions of the stars to each other do not exactly match, also the alignment of the pair AB to C. ../projects/double-stars/robert-zebahl/sketches/2020-03-18_stf1350_c2019_y4_atlas.jpg
Christopher Hay
Seeheim (Germany)
180mm (113x) AB: Immediately striking in 32x71 superfinder wihle panning through the area, a very evenly matched pair well split at that power. Closer inspection with the 7-inch at 113x reveals a fine blue-orange colour contrast between components A and B.
René Merting
Drachhausen (Germany)
320mm (45x) AB: bei 45x ein schönes enges Paar zweier gleich heller Sterne, beide strahlen weiß
STF1369, DI Lyn AB 7m0 8m0 25.1'' 150° 2019 Lyn 09h35m22.50s +39°57'47.70"
AC 7m0 8m4 116.3'' 323° 2017
BC 8m0 8m4 141.6'' 324° 2017
Christopher Hay
Seeheim (Germany)
15x45 AB: Binoculars with internal stabilisation, handheld. Clearly split, a compact little pair. Involved in a nice triangle of 42 and 43 Lyn to the east plus a third bright, orangish star to the south.
AB is a physical double at a distance to us of 278 light years.
Mark McCarthy
Fremont (California/USA)
508mm (333x) AB: DI Lyn Very wide and bright light yellow stars, ~1 delta mag. [did not notice COU 2084 Aa,Ab, 6.98/8.79 0.2"]
STF1362 7m0 7m2 4.9'' 125° 2017 Dra 09h37m56.18s +73°04'49.50"

../images/binary-star-orbits/STF1362-orbit-solution-1.jpg ../images/binary-star-orbits/STF1362-orbit-solution-2.jpg ../images/binary-star-orbits/STF1362-orbit-solution-3.jpg ../images/binary-star-orbits/STF1362-orbit-solution-4.jpg

Robert Zebahl
Leipzig (Germany)
70mm (31x) 2020-04-21: At 22x extremely tight, but separable. At 31x very fine separation. Both components appeared white. Very nice sight! At 57x well separated, similarly bright. One component appeared white-yellowish with a hint of orange, the other more white.
STT209 7m4 10m3 4.9'' 310° 2017 UMa 09h53m17.23s +50°37'16.30"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Light orange-yellow disk with faint diffraction ring. Extremely faint blue B ~4" can see it direct vision but it flashes forth with averted.
S605, 9 Sex 6m9 8m4 53.5'' 287° 2019 Sex 09h54m06.70s +04°56'43.50"
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x ein weit auseinander stehendes Pärchen, das trotzdem schön anzusehen ist - Komponente B im Nordwesten ist gut 1.5 Magnituden schwächer - A samtgelb, B kupfergrau - zurück auf 20x sind beide Sterne auch noch komfortabel getrennt - die Farbe von A ist noch intensiver, jetzt eher rapsgelb
STF1399 7m7 8m4 30.2'' 176° 2017 Leo 09h57m02.21s +19°45'44.60"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Easy to split with nice distance and obviously unequal. A conspicuous group of fainter stars is nearby. Main component appeared in a warm-white, fainter somehow darker (partly bluish, partly slightly orange).
Uwe Pilz
Leipzig (Germany)
105mm (53x) wie ein Schlangenbiß
Mark McCarthy
Fremont (California/USA)
317mm (553x) Faint pair, tough find dense with stars. 1 delta magnitude, wide separation.
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/STF%201399.png
★★ STT210 8m5 9m1 1.3'' 257° 2016 UMa 10h02m35.64s +46°21'42.50"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow A and white B, very tight. Faint, seeing needs to be perfect to see B in the diffraction.
★★ A2142 8m0 8m8 1.1'' 295° 2016 LMi 10h05m43.55s +41°02'42.70"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very fine, split, ~1-1.5". 8th magnitude and 1.5 delta mag B, close split, very nice pair. In the 80mm finder this is one of a triangle of equal magnitude stars.
★★ alpha Leo, 32 Leo, Regulus STFB6 AB 1m4 8m2 179.2'' 304° 2019 Leo 10h08m22.31s +11°58'01.90"
HDO127 AD 1m4 12m1 195.3'' 274° 2015
HDO127 BC 8m2 13m2 2.2'' 94° 2019
Christopher Hay
Seeheim (Germany)
10x56 AB: On tripod. B immediately pops out from the glare of A, thanks to its substantial distance. B is a vivid blue.
Emboldened by the unexpected ease with which the pair can be seen in the 10x56, I launch an attempt with 7x50 bins on the tripod. This is thwarted by the many rays emanating from A in the image. Too much exit pupil?
AB is a physical double at a distance to us of only 79 light years.
Christopher Hay
Seeheim (Germany)
15x60 AB: On tripod. B is a fine pinprick of light, seems bluish. An attractive unevenly matched pair.
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x ist B weit abgesetzt von A erkennbar - Regulus präsentiert sich strahlend weiß - B ist nur schwach weiß - kein echtes Doppelsternfeeling
Uwe Pilz
Leipzig (Germany)
105mm (288x) AB: sehr weit; einfach
Sarah Gebauer
Germany
150mm (30x) AB: relativ dicht beieinander, ein Stern sehr hell und groß, der zweite schwach und klein
Gerd Kohler
Langenzenn (Germany)
254mm (76x) AB: Bläulich-weiß - leicht rötlich. Großer Helligkeitsunterschied.
Gerd Kohler
Langenzenn (Germany)
254mm (76x) AD: Beim Begleiter von Regulus steht im fast gleichen Abstand, etwas nach Westen versetzt, ein sehr schwacher Stern.
René Merting
Drachhausen (Germany)
320mm (72x) AD: Komponente D ist südwestlich von B (STFB6) erkennbar, etwas weiter von A entfernt als B, klein und unscheinbar
René Merting
Drachhausen (Germany)
320mm (72x) AB: bei 72x extrem weit getrennt erkennbar - Komponente A ist weißblau, die wesentlich schwächere Komponente B strahlt weißgrau
STT523, 39 Leo 5m8 11m3 7.9'' 300° 2017 Leo 10h17m14.53s +23°06'22.30"
René Merting
Drachhausen (Germany)
100mm (213x) bei 142x habe ich das Gefühl, Komponente B ab und an westlich von A ganz schwach im ersten Beugungsring ausmachen zu können, aber noch unsicher - bei 213x dann zeigt B sich eindeutig und kann ab und an auch mal länger gesehen werden
Mark McCarthy
Fremont (California/USA)
508mm (333x) 39 Leo. ! Nice bright light yellow-orange A star. B is very small, very faint, ~8" separation, a single little point, barely has its own light
A2369 8m5 9m7 1.0'' 296° 2017 Leo 10h17m59.92s +17°11'11.90"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Needed higher magnification to get it. Orange star with a faint but nice star in first diffraction ring, much fainter, ~1". Nice
STF1423 9m4 10m1 0.7'' 308° 2018 Leo 10h19m10.64s +20°33'48.10"

../images/binary-star-orbits/STF1423-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Tough! Elongated to hairline split.
Mark McCarthy
Fremont (California/USA)
508mm (533x) Split with seeing, light orange A and very faint, ~3 delta mag B, very close, within diffraction ring <1"
★★ STF1424, gamma Leo, 41 Leo, Algieba AB 2m4 3m6 4.7'' 127° 2020 Leo 10h19m58.35s +19°50'29.40"

../images/binary-star-orbits/STF1424-AB-orbit-solution-1.jpg ../images/binary-star-orbits/STF1424-AB-orbit-solution-2.jpg

Robert Zebahl
Leipzig (Germany)
55mm (38x) At 38x split, but very tight with noticeable difference in brightness. At 56x and higher beautiful view of both components, which seemed to have similar colors. ../projects/double-stars/robert-zebahl/sketches/2019-02-09_gamma_leo.jpg
Robert Zebahl
Leipzig (Germany)
55mm (59x) Very nice unequal double. A appeared yellow-orange, B rather white-bluish. ../projects/double-stars/robert-zebahl/sketches/2019-03-09_gamma_leo.jpg
Christopher Hay
Seeheim (Germany)
60mm (58x) At 25x Algieba is already very elongated. At 58x a sliver of dark between the components, with clear brightness difference. At 70x split becomes more stable, but view not so pleasing as at 58x. Both components display vivid orange.
Robert Zebahl
Leipzig (Germany)
70mm (100x) At 67x still a relatively close pair, but well separated with quite a clear difference in brightness. At 100x easy to separate and visible color difference: A yellowish to slightly orange, B white-yellowish.
Robert Zebahl
Leipzig (Germany)
102mm (125x) Very nicely separated with wonderful contrast in brightness and color. Primary component slightly orange, companion yellowish.
Stefan Loibl
Rosenheim (Germany)
102mm (164x) very bright double star, slight colour contrast
Uwe Pilz
Leipzig (Germany)
105mm (120x) schon bei 37x sehenswert; trennbar bei 55x; orange-blauweiß
Robert Zebahl
Leipzig (Germany)
120mm (66x) At 48x easily seen as double star. It appeared as '8'. At 66x pretty tight with visible difference in brightness.
Winfried Kräling
Marburg (Germany)
127mm (250x) 08.04.2018: merklicher Helligkeitsunterschied, A = gelb-orange, B = gelb-orange ../projects/double-stars/winfried-kraeling/sketches/180408_04_Gamma%20Leo.jpg
Sarah Gebauer
Germany
150mm (83x) bei 83x sauber getrennt, ein leichter Farbunterschied (Weiß und helles Gelb) sichtbar ../projects/double-stars/sarah-gebauer/sketches/20200411%20Gamma%20Leo%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Algieba: Bright yellow and yellow-orange pair, 1 delta mag, 4-6"
René Merting
Drachhausen (Germany)
320mm (240x) bei 240x sehe ich zwei ordentlich getrennte Sterne (naja, nicht wirklich Sterne, sondern wild zappelnde Glitzerbällchen) - Komponente A strahlt in einem zarten Gelb, B ist weiß - zurück auf 144x sehe ich nur ein Stäbchen mit leichter Einschnürung, so wild tanzen die Sterne
Mark McCarthy
Fremont (California/USA)
508mm (333x) Algieba. Very bright, A is yellow-orange and B is a blazing white orange, like a fire
STF1426 AB-C 7m3 9m4 7.6'' 2018 Leo 10h20m32.32s +06°25'47.60"
AB 8m0 8m3 0.9'' 313° 2018

../images/binary-star-orbits/STF1426-AB-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 213x in guten Momenten als Stäbchen erkennbar
AB-C: bei 107x ist nördlich vom Hauptstern AB eine gut 2 Größenklassen schwächere Komponente erkennbar - AB ist weiß, C ist grau
Robert Zebahl
Leipzig (Germany)
102mm (160x) AB-C: Quite large angular distance and therefor easy to separate. The C component was pretty faint.
Robert Zebahl
Leipzig (Germany)
102mm (160x) AB: At first glance elongated, on closer look visible as '8'.
Stefan Loibl
Rosenheim (Germany)
102mm (164x) AB-C easily split, A-B not detectable as double
Uwe Pilz
Leipzig (Germany)
105mm (288x) A-B länglich, C weit
Mark McCarthy
Fremont (California/USA)
203mm (333x) AB: Split with seeing, white, very close, near equal. Part of plus one, a two delta mag not far away
STF1425 9m9 10m7 4.8'' 358° 2017 UMa 10h21m34.14s +46°09'07.60"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very faint pair, ~4-5" orange and blue, 0.5 delta mag.
★★ STT216 7m4 10m3 2.3'' 231° 2016 Leo 10h22m43.81s +15°20'39.70"

../images/binary-star-orbits/STT216-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (277x) A white and bright (7.3), B red & much fainter (10.3), a close split (2").
Mark McCarthy
Fremont (California/USA)
508mm (333x) Yellow and very much fainter orange B, 1 delta mag, ~4" separated
HJ2530 AC 6m4 6m7 201.6'' 63° 2015 Sex 10h24m13.15s +02°22'05.10"
Christopher Hay
Seeheim (Germany)
7x45 Handheld. Wide, strong, well-matched pair. Component A slightly orange, C colder. Nice in 8.6° FOV with Alpha and Beta Sextantis.
Christopher Hay
Seeheim (Germany)
12x36 Binoculars with internal stabilisation, handheld. Wide, very evenly matched pair, strong at this magnification in 5.6° FOV. Component A slightly orange, C slightly blue.
STTA104 7m2 7m3 209.0'' 287° 2013 LMi 10h24m22.19s +34°10'35.00"
Christopher Hay
Seeheim (Germany)
7x45 Handheld. Wide, striking matched pair. Nice together with triangle of 27/28/30 LMi, and thus also easy to find. HJL1057 also in field to southwest.
Delicate colour contrast in the triangle makes this a very attractive field: 30 LMi is yellowish-white, 28 reddish-white, 27 LMi colder.
In 15x45 binoculars STTA104 becomes almost too wide to feel it is a double, but the colour contrasts in the triangle become clearer.
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-11: Very wide pair of similarly bright components, unremarkable color. The double star stands close to the stars 27, 28 & 30 LMi and is probably more appealing in smaller binoculars. ../projects/double-stars/robert-zebahl/sketches/2020-04-11_stta104.jpg
STF1429 9m1 9m3 0.8'' 155° 2017 Leo 10h25m01.79s +24°36'44.10"

../images/binary-star-orbits/STF1429-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Very tough. Faint, need averted vision to brighten and sharpen. Elongated to clean split in the best moments with seeing, near equal magnitude
Mark McCarthy
Fremont (California/USA)
508mm (533x) Elongated to hairline at 333x, split at 533x. Light orange stars, near equal
STT217 7m8 8m6 0.8'' 151° 2019 Leo 10h26m53.01s +17°13'09.90"

../images/binary-star-orbits/STT217-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (333x) Just split cleanly, ~1 delta mag, yellow-tinged white stars. Nice close pair
HU879, bet LMi 4m6 6m0 0.5'' 228° 2017 LMi 10h27m53.09s +36°42'26.90"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Beta LMi. With apodizing mask I see an out of roundness / olive shape, too much glare to tell orientation, no other field stars
STF1439 8m3 8m9 1.4'' 73° 2019 Leo 10h30m06.42s +20°48'04.30"

../images/binary-star-orbits/STF1439-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (333x) Very clean images, light yellow-orange stars, ~1 delta mag, well split, very pretty
HU880 10m1 10m4 0.9'' 144° 2017 LMi 10h31m14.44s +37°07'27.40"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Exceptionally fine split, white stars
HDS1511 7m5 9m1 0.1'' 38° 2012 Leo 10h32m17.36s +24°26'32.10"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Out of round olive, airy disk swimming in diffraction
HU1338 & STF1448 HU1338 AB 7m5 13m6 3.5'' 184° 1920 Leo 10h34m23.24s +21°35'36.40"
STF1448 AC 7m5 9m6 11.0'' 259° 2015
Robert Zebahl
Leipzig (Germany)
70mm (44x) STF1448 (AC): 2020-04-10: Moderate separation, significant difference in brightness. A shows a beautiful bright orange, C as a faint greyish companion.
René Merting
Drachhausen (Germany)
100mm (32x) STF1448 (AC): bei 32x zeigt sich Komponente C im NW von A knapp getrennt - C ist nur ein Hauch von einem Stern - Helligkeitsunterschied enorm, ich schätze 3 Größenklassen (nur 2 mag laut Stelle Doppie)
Mark McCarthy
Fremont (California/USA)
317mm (277x) STF1448 (AC): Pretty orange and blue pair, 2 delta mag, ~10"
Mark McCarthy
Fremont (California/USA)
317mm (277x) STF1448 (AC): An orange and blue pair. Fainter than Alberio but just as pretty.
STF1450, 49 Leo 5m8 7m9 2.0'' 157° 2019 Leo 10h35m02.16s +08°39'01.60"
Robert Zebahl
Leipzig (Germany)
70mm (133x) B component appeared as clear brightening on the first diffraction ring of the primary component in the correct position angle.
Uwe Pilz
Leipzig (Germany)
105mm (200x) Begleiter klebt am ersten Ring
Mark McCarthy
Fremont (California/USA)
317mm (277x) White and slight yellow, ~6-7", nice pair.
Mark McCarthy
Fremont (California/USA)
508mm (333x) 49 Leo. Striking pair, light yellow A and a richer orange-yellow B, ~2.5 delta mag, well split
STF1454 9m0 11m0 1.3'' 358° 2016 LMi 10h38m11.10s +26°36'24.80"

../images/binary-star-orbits/STF1454-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Quite tough: averted vision only, very tight, similar magnitude, when seeing stills.
J79 9m0 10m1 1.5'' 132° 2017 Leo 10h38m54.93s +07°21'26.00"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Very nice, ~2 delta mag, close ~2" separation, blue-white stars
STT227 8m3 8m8 0.9'' 2017 Leo 10h41m41.58s +10°44'22.30"
Mark McCarthy
Fremont (California/USA)
317mm (277x) Faint reddish pair, near equal, just split but hazy, poor view.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Pure white stars, ~1" separation, ~2 delta mag, very fine and striking
A2483 9m4 11m4 2.2'' 227° 2001 Leo 10h42m08.09s +16°17'03.60"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Wow, very fine ~2 delta mag, ~2" separation. Very much fainter B about as faint as can be before needing averted vision
SMA75 AB 5m2 7m3 288.0'' 88° 2018 UMa 10h43m32.89s +46°12'13.90"
AC 5m2 11m1 152.0'' 16° 2018
AD 5m2 9m2 381.6'' 45° 2018
BD 7m3 9m2 259.2'' 357° 2018
Christopher Hay
Seeheim (Germany)
7x45 AB: Wide apart and large delta-mag, but still very much belonging together. No particular colour impression.
Smart 75 AB (also known as Shaya (SHY) 216) is a physical double at a distance to us of 121 light years. This is incidentally almost exactly the same distance to us as Alpha UMa AC, a further wide binocular pair in UMa.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Wide 80mm finder pair, white and slight yellow. In the scope there are some more faint stars about, so it is likely a small cluster -- 7 stars in the system.
42 LMi S612 AB 5m3 7m8 196.4'' 174° 2019 LMi 10h45m51.91s +30°40'56.60"
ARN3 AC 5m3 8m3 424.6'' 94° 2013
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. Panning around in the area the triangle of ABC is immediately striking. Component A cold-white, B reddish, C no particular colour.
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-11: Wide, striking triple system, which can be well observed with binoculars. A: quite bright, rather white, B: slightly orange, C: tending to orange. ../projects/double-stars/robert-zebahl/sketches/2020-04-11_42_lmi.jpg
Mark McCarthy
Fremont (California/USA)
80mm (13x) AB: Very widely separated, split in finder (196"!). white A with a slightly red B
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: 42 LMi: Very bright white and 3 delta mag orange B, very wide separation.
★★ STT229 7m6 7m9 0.6'' 262° 2019 UMa 10h48m02.55s +41°06'35.80"

../images/binary-star-orbits/STT229-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Just wider than a thin hair split of equal white stars, ~8th mag. 0.63"! in 40 years it will be 0.2"
BU597 9m2 10m1 0.9'' 47° 2015 Leo 10h54m49.70s +23°45'20.70"
Mark McCarthy
Fremont (California/USA)
508mm (333x) ~2 delta mag and ~1" separation, light orange stars, very steady images. Really nice
STF1487, 54 Leo 4m5 6m3 6.8'' 112° 2019 Leo 10h55m36.80s +24°44'59.00"
Robert Zebahl
Leipzig (Germany)
55mm (27x) At 27x split, but very tight with noticeable difference in brightness. At 71x easy to separate. No visible color difference.
Robert Zebahl
Leipzig (Germany)
70mm (67x) 2021-04-13: At 67x beautifully separated with clearly visible difference in brightness. Very attractive is the subtle color difference: light yellow & light blue. At 133x the color of the companion is a bit more pale: gray-blue. The primary component still shines in a beautiful light yellow.
Winfried Kräling
Marburg (Germany)
127mm (250x) 13.03.2017: Hauptkomponente gelblich, Begleiter bläulich, deutlicher Helligkeitsunterschied. Ebenfalls bei V=60x getrennt. ../projects/double-stars/winfried-kraeling/sketches/170313_03_54%20Leo.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Bright white pair (4.5, 6.3) wide sep (6")
Mark McCarthy
Fremont (California/USA)
508mm (333x) 54 Leo. Brilliant pair, light white-yellow stars, ~2 delta mag, wide
UC2059 & HDS1574 & COU1422 UC2059 AB 7m5 10m7 46.9'' 46° 2015 UMa 11h01m45.73s +36°40'41.60"
HDS1574 Aa-Ab 7m6 11m1 0.3'' 99° 2019
COU1422 Ba-Bb 11m2 11m5 0.6'' 38° 2008

../images/binary-star-orbits/HDS1574-Aa-Ab-orbit.jpg ../images/binary-star-orbits/COU1422-Ba-Bb-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) UC2059 (AB): Pretty well separated, 1.5 delta mag, not remarkable as I hoped given the odd designation.
Mark McCarthy
Fremont (California/USA)
762mm (1219x) COU1422 (Ba-Bb): Cou 1422 is a pair of 11th magnitude stars very close to UC 2059 -- best I could get of Cou 1422 was an elongation with the seeing. Tried 1219x without improving the elongation.
★★ BU1077, alpha UMa, 50 UMa, Dubhe AB 2m0 5m0 0.8'' 342° 2017 UMa 11h03m43.84s +61°45'04.00"
AC 2m0 7m2 370.0'' 205° 2015

../images/binary-star-orbits/BU1077-AB-orbit.jpg

Christopher Hay
Seeheim (Germany)
7x45 AC: AC: Very wide apart but still feel as if belonging together. A golden-yellow, C seems blue, a very attractive pair.
A, B and C are a physical triple system at a distance to us of 123 light years. This is incidentally almost exactly the same distance to us as SMA75 AB, a further wide binocular pair in UMa.
Robert Zebahl
Leipzig (Germany)
70mm (22x) AC: 2020-04-07: Very wide, uneven & inconspicuous pair. A appeared white-yellowish, for B I could not detect any color.
★★ HO378 AB 8m2 9m1 1.1'' 237° 2017 UMa 11h04m57.29s +38°24'38.20"

../images/binary-star-orbits/HO378-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) In a pretty cluster in the finder (~ 12 stars loose and poor, wide magnitude range, triangle shape). Pair is a fine split 1 delta mag 1", ice blue A and slightly yellow B.
★★ BU599, 65 Leo 5m7 9m7 2.8'' 106° 2015 Leo 11h06m54.20s +01°57'19.90"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Bright light orange star. As seeing resolves it to a disk and eliminates the diffraction, a tiny, faint star appears, planet-like, (~3") from the star. Only at the best moments, visibility of B star helped by averted vision.
STF1514 9m5 10m6 1.3'' 341° 2015 UMa 11h11m38.55s +66°06'48.00"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Extremely fine! It is at the base of a kite asterism, the fainter star of four. The three arcing the top of the kite are equal magnitude. STF 1514 is a very tight 1.5" but clean split, 1 delta mag. Nice!
HO50 6m5 8m4 3.0'' 35° 2017 UMa 11h13m40.09s +41°05'19.80"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Good disk of A star with momentary perfection, but cannot see B, I think the magnitue in WDS is overstated.
Mark McCarthy
Fremont (California/USA)
762mm (457x) The pair split immediately at 457x. A little diffraction but no doubt a small blue point just outside the first ring. Using the 8-inch aperture mask (effectively 8-inch f/18!) had a nice star image of A but B disappeared -- it became an averted vision, threshold object. Barlow here was no help to show it better. I think Ho 50B is fainter than the current data, and if the older data say it should be fainter, then it may well be variable. However, later in the night, I estimated Ho 50B to be as bright as STF 1964D, which is 9.02
STF1517 & BU1431 STF1517 AB 7m5 8m0 0.7'' 314° 2017 Leo 11h13m40.99s +20°07'43.30"
BU1431 AB-C 7m5 10m8 246.1'' 97° 2015

../images/binary-star-orbits/STF1517-AB-orbit.jpg

Sarah Gebauer
Germany
100mm (200x) STF1517 (AB): die Komponenten AB und C lassen sich natürlich problemlos bei geringer Vergrößerung trennen, für A und B reichen auch 200x nicht aus (Beobachtungsversuch erfolgte ohne vorherige Recherche, denn 0,7'' schafft mein Refraktor nicht)
Robert Zebahl
Leipzig (Germany)
102mm (187x) STF1517 (AB): 2020-03-28: At 187x the double star immediately appears elongated, but without notching. On closer observation, the slight difference in brightness could be detected. Not better at higher magnifications. Observation at quite good seeing (4/5).
Uwe Pilz
Leipzig (Germany)
105mm (200x) STF1517 (AB): länglich ../projects/double-stars/uwe-pilz/sketches/200327stf1517.jpg
Robert Zebahl
Leipzig (Germany)
152mm (225x) STF1517 (AB): 2020-03-27: Clearly elongated. In some moments the double star appeared notched with a small difference in brightness. Observation at moderate seeing (3/5).
Mark McCarthy
Fremont (California/USA)
317mm (340x) STF1517 (AB): Very tight, hair split small orange stars of equal magnitude. Wow!
Mark McCarthy
Fremont (California/USA)
508mm (533x) STF1517 (AB): Touching disks with 333x, clean slit with 533x, ~0.5" separation, Yellow-orange stars, near equal
BU1283 9m8 10m4 0.3'' 174° 2010 Leo 11h14m24.68s +15°30'51.80"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Elongated at 533x, but the sky is too hazy, and this pair is a bright star's glare. BU 1283 looks like a piece of debris from an exploding bright star. [Theta Leo, 3.33v, to the SW]
★★ STF1519 9m0 9m9 1.5'' 289° 2017 UMa 11h15m36.65s +59°46'43.40"
Mark McCarthy
Fremont (California/USA)
317mm (553x) 1 delta mag, tight 1.5" faint yellow stars.
★★ STF1523, xi UMa, 53 UMa, Alula Australis AB 4m3 4m8 2.1'' 155° 2019 UMa 11h18m10.90s +31°31'45.00"

../images/binary-star-orbits/STF1523-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
55mm (83x) 2019-02-09: Already seen as '8' at 83x. At 125x the overlapping of both Airy disks was visible, but also a slight difference in brightness. ../projects/double-stars/robert-zebahl/sketches/2019-02-09_xi_uma.jpg
Robert Zebahl
Leipzig (Germany)
70mm (100x) 2018-02-18: Very close together with similar brightness. At first glance seen as an '8', looking closer I partly split both components. Similar view also at 128x.
Robert Zebahl
Leipzig (Germany)
70mm (133x) 2020-03-15: Splendid sight! Beautifully separated with almost touching diffraction disks. The rather small difference in brightness was well visible. The diffraction rings of both components coalesced.
Robert Zebahl
Leipzig (Germany)
102mm (160x) 2020-03-16: Awesome! Bright with lovely, subtle diffraction rings. The distance between both components is a smaller than the diameter of the diffraction disk of the fainter component.
Uwe Pilz
Leipzig (Germany)
105mm (288x) Gemessen: 162°
Robert Zebahl
Leipzig (Germany)
120mm (168x) 2018-02-14: Well split with slight difference in brightness.
Robert Zebahl
Leipzig (Germany)
152mm (129x) 2019-02-06: Well split with visible difference in brightness. The colors of both components appeared equal.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Alula Australis. Short period. Pretty orange-yellow stars, ~half delta mag, ~2" separation
STF1529 7m1 7m9 9.3'' 254° 2017 Leo 11h19m22.64s -01°39'17.60"
Robert Zebahl
Leipzig (Germany)
16x70 2021-03-02: Very nice view, medium bright, very finely separated with little difference in brightness. However, the double star was too faint for detecting color.
STF1536, iota Leo, 78 Leo AB 4m1 6m7 2.2'' 93° 2019 Leo 11h23m55.37s +10°31'46.90"
AB-C 4m1 11m1 332.1'' 346° 2015

../images/binary-star-orbits/STF1536-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (133x) AB: 2020-03-28: The companion was well visible as brightening on the diffraction ring of the primary component. Sketch see observation with my 102mm refractor.
Sarah Gebauer
Germany
100mm (200x) AB: selbst bei 200x nur manchmal getrennt, eher schwierig mit Amiciprisma
Robert Zebahl
Leipzig (Germany)
102mm (125x) AB: 2020-03-28: At 125x clearly separated. A very beautiful sight! The companion was visible as almost round brightening close to the first diffraction ring of the primary component. The diffraction ring itself appeared very fine. At 224x also a very nice sight with a clear diffraction ring and the companion, which now appeared roundish. ../projects/double-stars/robert-zebahl/sketches/2020-03-28_iota_leo_stf1536.jpg
Mark McCarthy
Fremont (California/USA)
317mm (340x) AB: Quite close, very bright yellow white A and brownish B, split in A's diffraction ring
Mark McCarthy
Fremont (California/USA)
508mm (333x) AB: Iota Leo. Light orange A and a richer orange B, ~2 delta mag, ~2" separation
★★ 81 Leo HJ4433 AB 5m6 10m8 55.4'' 2018 Leo 11h25m36.37s +16°27'23.50"
SHY224 AC 5m6 7m2 999.9'' 207° 1998
Christopher Hay
Seeheim (Germany)
10x56 AC: Handheld. Components A and C, making up Shaya 224, are well framed in 6.3° FOV. Component A is cold blue.
Component C (= HIP 55262) is about three-and-a-half degrees south-southwest of component A (= 81 Leo) and is close to the Leo Triplet of galaxies. Two galaxies of the Triplet present themselves (sky quality: NELM 5m0 in target area), M66 is an elongated little nebula with its main axis pointing roughly towards C, while M65 is a faint but definite nebular presence with direct vision, closer to C than M66 is.
Shaya 224 is a physical double at a distance to us of 143 light years.
René Merting
Drachhausen (Germany)
100mm (64x) AB: bei 64x ploppt Komponente B weit getrennt nördlich von A auf, vorher war sie unsichtbar - B versteckt sich halb im Glanz von A - schönes Versteckspiel
Mark McCarthy
Fremont (California/USA)
317mm (170x) AB: bright orange-yellow A with a much fainter blue B, widely separated, a beautiful sight.
René Merting
Drachhausen (Germany)
320mm (45x) AB: bei 45x strahlt Komponente A gleißend hell und leicht gelblich - B zeigt sich gut abgesetzt ganz schwach im NO von A - kein echtes Doppelstern-Feeling - bei 72x verliert A ein wenig Farbe, B ist ein graues Pünktchen
★★ STF1540, 83 Leo AB 6m5 7m5 28.6'' 146° 2019 Leo 11h26m45.32s +03°00'47.20"
Stefan Loibl
Rosenheim (Germany)
10x50 clearly split, little difference in magnitude
Christopher Hay
Seeheim (Germany)
10x56 On tripod. Neat split. Attractive 6.3° FOV with a sprinkling of several 5- to 7-mag stars to the south. Tau Leo widely split directly to southeast.
In 15x60 on tripod well split, component A slightly orange, forms a fine double-double with Tau Leo.
83 Leo is a physical double at a distance to us of only 58 light years.
Robert Zebahl
Leipzig (Germany)
16x70 2021-03-02: Splendid sight together with the double star tau Leo as well as 82 Leo. Beautiful star field. 83 Leo very nicely separated with moderate difference in brightness. Yellowish orange & slightly orange.
René Merting
Drachhausen (Germany)
18x70 ein ordentlich getrenntes und dennoch schön eng stehendes Pärchen - Komponente A ist leicht gelblich, Komponente B im SO ist eine dreiviertel Magnitude schwächer und grauweiß
Robert Zebahl
Leipzig (Germany)
55mm (16x) Wonderful double with slight color contrast in a very nice field. Together with tau Leo stunning view. Slightly unequal. A appeared white-yellowish, B rather grey-bluish. ../projects/double-stars/robert-zebahl/sketches/2019-03-09_83_leo_tau_leo.jpg
Mark McCarthy
Fremont (California/USA)
80mm (13x) Finder split, in same field as Tau.
Mark McCarthy
Fremont (California/USA)
317mm (340x) Yellow A and reddish B wide separation.
René Merting
Drachhausen (Germany)
320mm (72x) bei 72x steht das Paar zwar weit auseinander, es wirkt aber trotzdem gut zusammengehörend - Komponente B im SO ist eine dreiviertel Magnitude schwächer
★★ STFA19, 84 Leo, tau Leo AB 5m0 7m5 89.2'' 181° 2019 Leo 11h27m56.23s +02°51'22.50"
Christopher Hay
Seeheim (Germany)
7x50 On tripod. Comfortably split. Component A is mildly orangish-yellow.
Can't quite eke out 83 Leo's secondary (NELM 5m0, elevation 40°).
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. Wide pair. Component A dull golden-yellow, component B seems bluish. Attractive.
In 15x60 on tripod very wide. Component A very mild orange, B grey-blue. Fine sight in 3.3° FOV together with well-split 83 Leo.
Robert Zebahl
Leipzig (Germany)
16x70 2021-03-02: Splendid sight together with the double star 83 Leo as well as 82 Leo. Beautiful star field. Tau Leo beautifully separated with significant difference in brightness. Yellowish & bluish.
Robert Zebahl
Leipzig (Germany)
55mm (16x) Wonderful double with slight color contrast in a very nice field. Together with 83 Leo stunning view. Noticeable unequal. A appeared white-yellowish with a hint of orange, B grey-bluish. ../projects/double-stars/robert-zebahl/sketches/2019-03-09_83_leo_tau_leo.jpg
Mark McCarthy
Fremont (California/USA)
80mm (13x) Finder split, the A star is prismatic in color effects, bluish B
Mark McCarthy
Fremont (California/USA)
317mm (340x) Bright yellow A, bluish B, very widely separated
STF1547, 88 Leo AB 6m3 9m1 15.7'' 330° 2020 Leo 11h31m44.94s +14°21'52.20"

../images/binary-star-orbits/STF1547-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
55mm (42x) Well split with moderate distance. Primary component appeared white-yellowish. Pretty unequal pair.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x erscheint Komponente B nordwestlich von A etwas mehr als knapp getrennt ganz schwach, bestimmt 3 Größenklassen Helligkeitsunterschied - Komponente A warmweiß, B ist grau
Sarah Gebauer
Germany
100mm (45x) fein, aber gut getrennt, die südliche Komponente ist deutlich heller, die nordwestliche zeigt sich als ganz schwacher Punkt
Uwe Pilz
Leipzig (Germany)
105mm (88x) gelb und violett ../projects/double-stars/uwe-pilz/sketches/210427_88Leo.jpg
Gerd Kohler
Langenzenn (Germany)
254mm (76x) Der Doppelstern ist getrennt.Bläulich-weiß - orange-leicht rötlich. Etwas schwächerer Begleiter.
Mark McCarthy
Fremont (California/USA)
317mm (340x) 88 Leonis: A favorite! Yellow and blue pair, wide
René Merting
Drachhausen (Germany)
320mm (45x) bei 45x ein schönes enges Sternpaar, ordentlich getrennt - Komponente A strahlt hellgelb, B ist deutlich schwächer und empfiehlt sich mit einem Kupferton - ein schöner Farbkontrast
★★ STT235 AB 5m7 7m5 0.9'' 43° 2017 UMa 11h32m20.76s +61°04'57.90"

../images/binary-star-orbits/STT235-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Nice! Yellow and orange, 1.5 delta mag, split when seeing shows perfect disks. The stars both show albedo effects, look like suns / globes with shadowing.
Mark McCarthy
Fremont (California/USA)
508mm (533x) Short period. Pretty yellow A, orange B, ~1" ~2 delta mag
★★★ STF1552, 90 Leo AC 6m3 9m8 63.4'' 235° 2018 Leo 11h34m42.50s +16°47'48.90"
AB 6m3 7m3 3.1'' 209° 2018
Robert Zebahl
Leipzig (Germany)
55mm (42x) AB: A and B very tight and unequal. Much fainter component C very wide apart. All components almost in line. Very nice view. ../projects/double-stars/robert-zebahl/sketches/2019-03-09_90_leo.jpg
Sarah Gebauer
Germany
100mm (136x) lange Zeit nach der ersten Beobachtung nun auch die Komponenten A und B getrennt, was bei 136x gut gelingt ../projects/double-stars/sarah-gebauer/sketches/90%20Leo2.jpg
René Merting
Drachhausen (Germany)
100mm (142x) AB: bei 64x wirken die Komponenten A und B wie eine 8 - bei 142x dann die Gewissheit, B ist jetzt allein erkennbar, vom Positionswinkel südwestlich, aber etwas südlicher als C - Helligkeitsunterschied eine dreiviertel Größenklasse - B wirkt hellorange gegen die weiße Komponente A
AC: bei 32x ist Komponente C ziemlich weit südwestlich von A erkennbar - Helligkeitsunterschied mindestens 2.5 Größenklassen
Uwe Pilz
Leipzig (Germany)
105mm (88x) bläulich und violett ../projects/double-stars/uwe-pilz/sketches/210427_90Leo.jpg
Sarah Gebauer
Germany
150mm (30x) AB: einfach zu trennen, erst bei 83x, dann auch bei 30x, sehr feine Punkte mit sichtbarem Helligkeitsunterschied ../projects/double-stars/sarah-gebauer/sketches/20200415%2090%20Leo%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
317mm (170x) AB: 90 Leonis, a close but easily split pair at 170x, a yellow-white A and a bluish-white B.
Mark McCarthy
Fremont (California/USA)
508mm (333x) AB: 90 Leo. Blazing white pair, ~1 delta mag, ~3"
STF1555 & HJ503 STF1555 AB 6m4 6m8 0.8'' 149° 2016 Leo 11h36m17.94s +27°46'52.70"
HJ503 AB-C 5m8 11m2 22.5'' 156° 2016

../images/binary-star-orbits/STF1555-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) STF1555 (AB): blickweise gerade eben trennbar ../projects/double-stars/frederik-wanink/sketches/STF1555.jpg
Mark McCarthy
Fremont (California/USA)
317mm (443x) STF1555 (AB): Nice! AB tight hair-split white pair, with fainter & wide separated AB-C in a row to the east.
Mark McCarthy
Fremont (California/USA)
317mm (443x) HJ503 (AB-C): Nice! STF 1555AB tight hair-split white pair, with fainter & wide separated C in a row to the east.
Mark McCarthy
Fremont (California/USA)
508mm (553x) STF1555 (AB): Hairline split at 333x, clear split with 533x, very close ~0.5", bright. Part of plus one
BU603 AB 6m0 8m5 1.0'' 329° 2019 Leo 11h48m38.71s +14°17'03.20"

../images/binary-star-orbits/BU603-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (200x) sehr schwierig ../projects/double-stars/uwe-pilz/sketches/210330BU603.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) nicht getrennt
Mark McCarthy
Fremont (California/USA)
203mm (533x) Suspected at 205x and 333x but needed higher magnification to see it. B is a very small point, with seeing, in the first diffraction ring. ~1" and ~3 delta mag
STF1575 7m4 7m9 30.5'' 211° 2018 Vir 11h51m57.57s +08°49'48.00"
Robert Zebahl
Leipzig (Germany)
16x70 2021-03-02: Very nice view! Very striking in the field together with xi Vir, 4 & 6 Vir. Fairly bright with moderate separation. Slightly orange & grey-bluish.
René Merting
Drachhausen (Germany)
18x70 ein sehr komfortabel getrenntes Sternpaar - B im Südwesten ist eine halbe Größenklasse schwächer - A weißorange, B weißbläulich - ein ansehnlicher FG-Stern
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein schön getrenntes Sternpaar mit zwei ähnlich hellen Sternen - Komponente B im SW ist maximal eine halbe Größenklasse schwächer - deutlich wahrnehmbarer Farbkontrast, A ist weißgelb, B dagegen wirkt blaugrau
René Merting
Drachhausen (Germany)
320mm (72x) bei 72x zwei gleichhelle Sterne, die weit getrennt auseinander stehen - A im NO ist leicht gelblich, B mit einem leichten Schlag ins Blaue, sprich weißblau - dadurch zarter Farbkontrast - beide Sterne sind schön hell und auffällig im Umfeld
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/STF%201575.png
STTA112 AB 8m3 8m5 73.4'' 36° 2017 Leo 11h54m32.07s +19°24'40.40"
Christopher Hay
Seeheim (Germany)
7x45 Handheld. In good moments well separated, two fine pinpricks of light. Hard to maintain split at 7x handheld under my 5m0 NELM sky. On tripod or under a slightly better sky probably a pleasant matched pair.
A physical double at a distance to us of 132 light years.
Christopher Hay
Seeheim (Germany)
15x60 Wide, very evenly matched pair, dominates the 3.3° FOV. Primary seems more orange than the secondary, but this is uncertain.
BRT2289 11m1 11m1 1.6'' 87° 2015 Leo 11h56m07.55s +20°15'08.20"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Very fine near equal white, nice and clean
STT243 9m1 9m7 1.2'' 2017 UMa 11h59m48.70s +53°23'52.10"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Super tight split ~1", faint, white, 1 delta mag. M109 is nearby just in of FOV. This pair just beneath its core
A2163 10m3 10m4 0.7'' 169° 2016 Com 12h02m12.09s +21°07'36.90"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Excellent pair. Hairline split at 333x, nice wide split with 533x. Near equal, >0.5"
BU27 7m1 10m5 3.6'' 104° 2015 Com 12h20m04.86s +13°51'18.20"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Light orange A and very faint bluish B, seen with averted vision at first then can hold direct. ~4" to west. Nice!
STT249 AB 8m2 9m2 0.4'' 257° 2016 UMa 12h23m50.80s +54°09'30.50"
Mark McCarthy
Fremont (California/USA)
317mm (738x) very slightly notched elongation / overlapped disks.
STF1646 10m3 12m9 5.6'' 260° 2017 CVn 12h28m09.12s +36°41'02.10"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow and blue. Need averted vision for B to reveal itself. Pretty!
★★ STFA21, 17 Com, AI Com AB 5m2 6m6 146.4'' 251° 2018 Com 12h28m54.72s +25°54'46.40"
Christopher Hay
Seeheim (Germany)
7x45 Handheld. Well split, strong compact pair. Component A seems bluish, B warmer. At this low power 17 Com is the most double-starish pair in Melotte 111, the Coma Star Cluster. Fantastic star-strewn 8.6° FOV with the stars of the cluster.
A physical double at a distance to us of 238 light years.
René Merting
Drachhausen (Germany)
320mm (72x) bei 72x ein weit auseinander stehendes Paar - schöner Farbkontrast, A weißblau, B im SW leicht gelblich schimmernd
J1023 11m4 11m9 5.2'' 173° 2019 CVn 12h30m46.44s +36°39'34.50"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Excessively faint, averted vision required to pick out, well separated.
★★★ SHJ146 AB 7m7 8m7 49.5'' 290° 2017 Vir 12h31m14.61s +01°19'37.00"
René Merting
Drachhausen (Germany)
18x70 Komponente B ist westlich von A erkennbar - Helligkeitsunterschied 1.5 Magnituden - A weiß, B grau - das Sternpaar fällt auf, weil kaum gleichhelle Sterne in der Umgebung stehen
Robert Zebahl
Leipzig (Germany)
70mm (33x) Visible difference in brightness and color. I couldn't precisely define the colors itself, but A appeared rather orange, B rather bluish.
Robert Zebahl
Leipzig (Germany)
102mm (28x) Pretty wide pair with visible difference in brightness and lovely color contrast. A: pale orange, B: light blue.
★★ WRH12, 23 Com 5m0 6m9 0.3'' 12° 2016 Com 12h34m51.12s +22°37'45.10"

../images/binary-star-orbits/WRH12-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) 23 Com. I get a definite snowman and can tell the larger from the smaller star, pointed in a certain direction in relation to a faint field star. Short Period double
★★ STF1657, 24 Com 5m1 6m3 20.2'' 272° 2018 Com 12h35m07.76s +18°22'37.40"
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. Clean split. Strong pair dominating 4.5° FOV. Primary pale yellow. Secondary too close for clear colour impression but certainly colder.
A physical double at a distance to us of 450 light years.
René Merting
Drachhausen (Germany)
18x70 ein wunderschönes eng stehendes FG-Sternpaar - Komponente B im Westen ist 1.5 Magnituden schwächer - A strahlt weißgelb, B wirkt dagegen etwas unterkühlt
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-04: Splendid sight! Very nice difference in brightness and color: pale orange & grey-blue.
Robert Zebahl
Leipzig (Germany)
102mm (28x) Very beautiful view with moderate distance and difference in brightness. A: glossy, light orange, B: white- bluish.
Christopher Hay
Seeheim (Germany)
125mm (64x) Well apart. Hugely dominant in 1.3° FOV. Primary slightly orangish yellow, secondary ice blue, extremely attractive.
Robert Zebahl
Leipzig (Germany)
200mm (60x) Well split with obvious difference in brightness. Fainter component appeared bluish, the brighter one slightly orange.
Mark McCarthy
Fremont (California/USA)
203mm (205x) Very pretty bright light orange and fainter blue, wide separation. Such a sight!
★★ AG180 7m8 9m8 0.3'' 355° 2007 Com 12h36m48.74s +20°14'15.80"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Most remarkable. I can see the light orange airy disk of A, though it dances in diffraction. When seeing stills, a very fine, very small point presents itself for a moment before being washed out. Consistently in the same place as I move the eyepiece about
★★★ STF1670, gamma Vir, 29 Vir, Porrima AB 3m5 3m5 3.0'' 357° 2020 Vir 12h41m39.60s -01°26'57.90"

../images/binary-star-orbits/STF1670-AB-orbit.jpg

Christopher Hay
Seeheim (Germany)
15x60 28 February 2021 at 3" separation: Very slight elongation. PA estimated at 5° (thus only 9° off, which seems fairly precise to me considering the low power of 15x and the minimal elongation, both of which make PA estimation difficult).
Intentionally flashed the eyes on the almost full Moon directly prior to observation in order to enhance acuity. Compared the sight of Porrima repeatedly with that of similarly bright Epsilon Vir (Vindemiatrix) to check whether the elongation is perhaps an artefact of the bincolulars or of my eyes, but no elongation seen there.
Robert Zebahl
Leipzig (Germany)
55mm (56x) 2019-05-18: At 38x slightly elongated. At 56x touching diffraction disks. At 71x clearly separated with very small gap.
Robert Zebahl
Leipzig (Germany)
70mm (104x) 2019-05-04: At 47x clearly visible as '8', at 73x split with almost touching diffraction disks. At 104x clearly separated, equally bright and pretty close together. The gap was smaller than the diameter of the diffraction disk.
Robert Zebahl
Leipzig (Germany)
102mm (125x) 2019-05-01: Extremely nice double star! Equally bright and relatively close together. Both components appeared yellowish-white.
Uwe Pilz
Leipzig (Germany)
105mm (200x) weiß-weiß, die nördliche Komponente ist eine Winzigkeit heller
Winfried Kräling
Marburg (Germany)
127mm (146x) 21.04.2018: Bei V=100x erscheint dieser orangefarbene Doppelstern bereits als „8“. Bei V=146x ist Porrima voll getrennt. ../projects/double-stars/winfried-kraeling/sketches/180421_03_Gamma%20Vir.jpg
Sarah Gebauer
Germany
150mm (166x) die 2,8'' entfernten Komponenten A und B konnten haarscharf bei 83x und 166x getrennt werden, beide strahlen gleich hell als ganz dichte Glanzpünktchen; Komponenten E und F wurden gesehen, C und D allerdings nicht; bei 83x waren AB ganz knapp nicht mehr voneinander getrennt ../projects/double-stars/sarah-gebauer/sketches/20200416%20Gamma%20Vir%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
317mm (170x) Porrima. Very pretty yellow-white, near equal, close split at 170x. Star disks improved with apodizing mask.
★★★ STF1694 AB 5m3 5m7 21.8'' 324° 2017 Cam 12h49m13.80s +83°24'46.30"
Christopher Hay
Seeheim (Germany)
7x45 Handheld. Very elongated with absolutely clear PA, but hand tremor prevents separation.
Christopher Hay
Seeheim (Germany)
7x50 On tripod. Split with a sliver of black inbetween, with creamy-white components, attractive sight. Dry-frozen night in January, 47° elevation above horizon.
Christopher Hay
Seeheim (Germany)
10x42 Binoculars with internal stabilisation, handheld. Fine split with definite difference in brightness of components.
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. AB cleanly split with distinct difference in magnitudes. Strong visual presence of this physical double is enhanced by the complete lack of visual competition in 4.5° FOV. Interesting to contemplate that in the 9th century AD Struve 1694 was just as close to the celestial north pole as Polaris (also a physical double) is today. Also known as 32H Cam, which comes from the celestial map produced by Johannes Hevelius in the late 17th century.
Christopher Hay
Seeheim (Germany)
25x80 Well apart but by no means falling apart, and totally dominating the 3.2° field of view. Neither component would appear particularly colourful on its own, but viewed together the primary is definitely more on the orange side and the secondary more bluish.
At 25x in 3.2° FOV and with an exit pupil around 3mm making the sky background pitch-black, STF 1694 has such a strong visual impact that it becomes a showpiece specimen of a double star. Three-star rating awarded because of this strong visual presence plus binocular accessibility (see 7x50 observation) plus true physical nature of the double (according to Stelledoppie) plus pole-star role in the Middle Ages.
Robert Zebahl
Leipzig (Germany)
70mm (15x) Easy to split with noticeable angular distance and slight difference in brightness. The faint component tends to be more bluish, the brighter one appeared more light yellowish.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x strahlen beide Komponenten richtig hell und gut getrennt - leichter Farbkontrast, Komponente A ist leicht gelblich, B wirkt eher unterkühlt
STF1685 AB 7m3 7m8 16.0'' 202° 2018 Com 12h51m54.80s +19°10'19.90"
René Merting
Drachhausen (Germany)
18x70 ein schicker FG-Doppelstern - ein enges Paar mit der leicht schwächeren Komponente B im Süden - schwacher Farbkontrast, der wieder mal zwischen den Sternen hin und her zu springen scheint
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-04: Lovely sight! Beautifully separated with little difference in brightness. Together with two other brighter stars the double star forms an almost right-angled triangle. At 44x the primary component appears in pale orange, the companion rather grey-bluish. ../projects/double-stars/robert-zebahl/sketches/2020-04-04_stf1685.jpg
Christopher Hay
Seeheim (Germany)
125mm (64x) Wide split. Component A bluish, B warmer. Well-matched pair.
A physical double at a distance to us of 722 light years.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Brighter white A, 0.5 delta mag B, pretty wide separation.
STFA23, 32 Com AB 6m5 7m0 196.3'' 51° 2015 Com 12h52m12.26s +17°04'26.20"
AC 6m5 8m9 905.4'' 262° 2015
Christopher Hay
Seeheim (Germany)
7x45 AB: Wide compact pair. Component A (=32 Com) is brighter than component B (=33 Com) and orangish.
Nice in 8.6° FOV together with globular cluster M53, which presents as a fluffy little ball. 2° north of 32/33 Com is an interesting 2° long east-west oriented clustering of stars, and 1° north of M53 is a similar, brighter and more compact clustering. Overall an extremely attractive field.
Robert Zebahl
Leipzig (Germany)
8x40 AB: 2020-04-05: Widely separated pair. The component A (32 Com) appeared slightly orange, the component B rather grey-bluish. Overall a beautiful sight. The double star is located right in the middle between the two bright stars 27 & 36 Com.
Christopher Hay
Seeheim (Germany)
15x45 AB: Striking pair, very wide but holding together well thanks to matched brightnesses. Component A (=32 Com) more orangish, component B (=33 Com) more bluish.
STF1688 AB 9m2 11m1 14.4'' 344° 2015 CVn 12h53m35.26s +37°58'20.90"
Mark McCarthy
Fremont (California/USA)
317mm (71x) a faint pair, yellow A and orangish B, which I identified using 340x, but can still split at 71x with STF 1692 & STF 1702 in the same low power field
MET9 5m7 7m8 1.7'' 50° 2016 Com 12h54m39.98s +22°06'28.80"
Mark McCarthy
Fremont (California/USA)
203mm (667x) Using 8" 205x I see nothing. 8" 410x suspect elongation. 8" 667x I see a fleeting, bluish point just outside of first diffraction ring. A is light yellow orange and bright, 2 delta mag. to B. A star feels elongated / egg shaped. With 20" and 667x the seeing is too messy though there is a knot in the diffraction where I had noticed the point with 8". Strong feeling A is elongated.
★★ STF1692, 12 CVn, alpha CVn, Cor Caroli AB 2m9 5m5 19.5'' 230° 2018 CVn 12h56m01.67s +38°19'06.20"
Christopher Hay
Seeheim (Germany)
11x80 Difficult, but definitely split. Interesting to compare directly with Zeta UMa (Alcor): the latter very close to separation, but not quite there.
Robert Zebahl
Leipzig (Germany)
70mm (22x) Beautiful view. Clearly unequal with nice angular distance. Primary component appeared in pale yellow, companion silvery-white.
Christopher Hay
Seeheim (Germany)
76mm (17x) Clearly split. Primary slightly yellowish. Secondary too close to get a clear colour impression, but seems grey-blue in good moments.
René Merting
Drachhausen (Germany)
100mm (32x) bei 64x ein auffälliger Doppelstern - A ist gleißend weiß, B im Südwesten ist 1.5 Größenklassen schwächer (2.67 mag lt. Stelle Doppie, schon zum zweiten Mal vertan hier)
Uwe Pilz
Leipzig (Germany)
105mm (66x) blauweiß-orange, trennbar bei 16x
Uwe Pilz
Leipzig (Germany)
105mm (200x) schon bei 26x getrennt ../projects/double-stars/uwe-pilz/sketches/CorCaroli.jpg
Robert Zebahl
Leipzig (Germany)
114mm (28x) Well split with big difference in brightness.
Sarah Gebauer
Germany
150mm (83x) deutlicher Helligkeitsunterschied, sehr einfach zu trennen ../projects/double-stars/sarah-gebauer/sketches/20200415%20Alpha%20CVn%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
203mm (205x) Cream white and light canary yellow. Well separated, 2 delta mag.
Mark McCarthy
Fremont (California/USA)
203mm (205x) Cor Caroli: Cream white and light canary yellow. Well separated, 2 delta mag.
Gerd Kohler
Langenzenn (Germany)
254mm (76x) Weiß-leicht bläulich - leicht orange rötlich. Kleiner Helligkeitsunterschied.
Mark McCarthy
Fremont (California/USA)
317mm (71x) Cor Caroli. Cream and bluish, use low power to fit STF 1688 & STF 1702 in the same field
René Merting
Drachhausen (Germany)
320mm (72x) bei 72x ein schönes Pärchen - A ist weiß - B zeigt sich gut getrennt südwestlich von A, ist gut 1.5 Größenklassen schwächer (2.67 mag laut Stelle Doppie) und mit einem leichten Stich ins gelbliche (warmweiß) - zurück auf 20x eine ungleiche 8, bei 32x knapp getrennt
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/STF%201692.png
STF1702 AB 8m7 9m4 35.9'' 83° 2017 CVn 12h58m31.97s +38°16'43.60"
Mark McCarthy
Fremont (California/USA)
317mm (71x) wide orange-yellow pair, in same low power field as STF 1692 & STF 1688
STF1709 7m9 10m0 2.7'' 252° 2016 Com 13h02m30.62s +23°29'57.80"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Nice! Brighter yellowish white A and 4 delta magnitude B, wide separation ~3" to west.
Mark McCarthy
Fremont (California/USA)
508mm (333x) White stars, ~2 delta mag, ~3" separation. Very attractive pair
HO257 10m4 10m9 2.0'' 154° 2016 Com 13h05m51.04s +26°13'36.40"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Equal white, nice, ~2"
COU11, 39 Com AB 6m1 8m8 1.8'' 315° 2019 Com 13h06m21.28s +21°09'12.60"
Mark McCarthy
Fremont (California/USA)
203mm (333x) 39 Com. Very beautiful pair, A is creamy white, B is much fainter and bluish, ~1.5", resolved with seeing just beyond first diffraction
COU2708 9m6 10m5 4.0'' 78° 2016 Com 13h08m04.40s +23°24'42.80"
Mark McCarthy
Fremont (California/USA)
203mm (333x) B seen with averted vision, then I can hold direct. White stars, ~5". Nice. Physical
★★ STF1728, 42 Com AB 4m8 5m5 0.6'' 193° 2019 Com 13h09m59.28s +17°31'46.00"
AB-C 4m4 11m4 84.8'' 349° 2014
Mark McCarthy
Fremont (California/USA)
317mm (443x) AB-C: Alpha Com: Bright yellow, very faint blue B
Mark McCarthy
Fremont (California/USA)
508mm (1067x) AB: Diadem. !! Most definite well split near equal, light yellow-orange. A faint star [AB-C] also in the field to tell orientation. Short period, made sketch. Wow!
STFA24 AB 6m0 6m3 275.6'' 296° 2012 CVn 13h10m03.27s +38°29'55.90"

This double star contains of the components 15 and 17 CVn.

Robert Zebahl
Leipzig (Germany)
8x40 Both components similar in brightness with large distance.
Christopher Hay
Seeheim (Germany)
15x45 Already clearly split in 3x opera glass. In 15x45 the pair becomes interesting due to clear colour contrast, 17 CVn orangish, 15 CVn much colder, almost bluish.
Charming in 4.5° FOV together with asterism two degrees northeast made up of 19/20/23 CVn plus an unnamed fourth bright star to the southwest of those three.
Mark McCarthy
Fremont (California/USA)
317mm (277x) Wide bright pair
René Merting
Drachhausen (Germany)
320mm (45x) extrem weit getrennt, ein auffälliges Trio zusammen mit 16 CVn nördlich - eher etwas für Kleinst-Ferngläser
★★ BGH46 AB 6m5 7m6 202.9'' 58° 2015 Com 13h16m32.26s +19°47'07.00"
Christopher Hay
Seeheim (Germany)
7x45 Handheld. Well apart. Nice in 8.6° FOV with very similar, slightly wider and brighter 1 Boo six degrees due east.
BGH = S. van den Bergh. BGH46 is a physical double at a distance to us of 279 light years.
Robert Zebahl
Leipzig (Germany)
8x40 2020-04-05: Widely separated with well visible difference in brightness. A appeared slightly white-bluish, B darker in color and not clearly definable.
Christopher Hay
Seeheim (Germany)
15x45 Wide apart. Would probably no longer feel like a pair in a crowded Milky Way field, but here, not all too far from the North Galactic Pole, the two components hold together well (and are indeed a physical pair).
Very attractive 4.5° FOV to south with east-west string of stars followed by fluffy ball of globular M53 and finally brilliant Alpha Com.
Mark McCarthy
Fremont (California/USA)
80mm (13x) Wide finder split, 1 delta mag, not much to recommend. Triangle of stars to the south, pointing to Bgh 46. [I did look at this at 667x to see if one of the wide pair had a pair of its own, but did not scrutinize well enough. This one should try on a really good night with 20": HDS1862 = Aa,Ab 6.56/9.69 0.4".]
BU800 AB 6m7 9m5 7.6'' 104° 2018 Com 13h16m51.05s +17°01'01.90"

../images/binary-star-orbits/BU800-AB-orbit.jpg

Christopher Hay
Seeheim (Germany)
125mm (36x) AB, March 2019: Clearly split in good moments, but secondary popping in and out of view in instable seeing.
A physical double only 36 light years distant to us.
Mark McCarthy
Fremont (California/USA)
203mm (333x) Lovely yellow and orange, very pretty, wide separation, 2.5 delta mag.
Mark McCarthy
Fremont (California/USA)
203mm (333x) Nice pair, A is a light but rich yellow, B is blue-white. Wide, ~2 delta mag
Mark McCarthy
Fremont (California/USA)
317mm (553x) Not difficult, orange-yellow A with bluish B, 3 delta mag. pretty wide to east.
★★ HU644 AB 9m1 9m9 0.1'' 354° 2019 CVn 13h19m45.58s +47°46'41.10"

../images/binary-star-orbits/HU644-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (443x) Orange-red pair, near equal mag, split with seeing at 443x
A566 9m0 10m8 2.0'' 66° 2016 Com 13h22m17.99s +26°31'10.10"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Wow, very fine, very delicate pair, ~2" and ~2-3 delta mag
★★ zeta UMa STF1744, 79 UMa, Mizar AB 2m2 3m9 14.6'' 154° 2019 UMa 13h23m55.42s +54°55'31.50"
STF1744, Mizar & Alcor AC 2m2 4m0 707.7'' 72° 2017
SMR4 AD 2m2 7m6 492.8'' 102° 2017
Christopher Hay
Seeheim (Germany)
naked eye AC, Mizar/Alcor: After seeing the two stars separated for the first time under clear corona skies in spring 2020, this became a regular and easy sighting. Naked-eye star splitting is a skill that develops rapidly with practice. Mizar and Alcor are wide apart with my 60-year-old eyes, and occasionally Alcor appears slightly bluish.
Christopher Hay
Seeheim (Germany)
7x50 On tripod. Mizar (AB) is an uneven figure-8, the smaller circle of the 8 pointing to an estimated PA of 150°. Without knowing that this is a double star one might think the binoculars have collimation issues, but Epsilon UMa displays a perfect little Airy disk.
Alcor (C) appears bluish, Mizar creamy-white.
D seems reddish.
René Merting
Drachhausen (Germany)
8x30 AC: ein ultraweit getrenntes Pärchen - Komponente C im NO schätze ich eine Größenklasse schwächer ein (1.78 mag laut stelle Doppie) - Komponente D (SMR4) ist östlich der beiden Sterne ganz schwach erkennbar, D steht dabei näher zu C
Robert Zebahl
Leipzig (Germany)
8x40 AB: 2020-04-05: Even with tripod not separable.
Christopher Hay
Seeheim (Germany)
10x56 AB: On tripod. Touching stars with a sliver of black in-between in good moments. Very aesthetic 6.3° field of view together with a little star group around 82 UMa.
Christopher Hay
Seeheim (Germany)
12x24 AB: On tripod. Very finely split, but stable.
Christopher Hay
Seeheim (Germany)
15x45 AB: Binoculars with internal stabilisation, handheld. AB nicely split with strong difference in magnitudes between A and B, very pretty.
Christopher Hay
Seeheim (Germany)
42mm (12x) AB: At 6.3x substantially elongated with clear positions of the brighter/darker components. At 10.7x a very stretched figure-eight tantalisingly close to popping apart. At 12x cleanly split with a stable sliver of black between A and B.
Robert Zebahl
Leipzig (Germany)
70mm (10x) AB: 2020-04-12: Observation from city with a 70/400mm ED refractor, for which I made aperture masks from 10mm to 60mm. Goal was to find the minimum magnification for a successful split.

70mm: At 12.5x no separation of the components possible due to outshining. Grey filters brought a slight improvement, but again no separation or elongation was visible.

60mm: At 12.5x slight outshining of the companion, clearly elongated and almost separated.

50mm: At 12.5x the companion was almost outshined. A separation was just possible.

40mm: At 12.5x both components appear finely separated from each other.

30mm: At 10x not clearly separable due to outshining, but clearly elongated. At 12.5x then quite easy to separate with a fine star rendition.

20mm: At 10x the companion is still clearly visible, but quite close to the primary component. At 12.5x best view under the used apertures with a very fine rendition!

10mm: At 10x the companion appears very faint. Separation possible, but extremely tight. At 12.5x reasonably well separated.
Robert Zebahl
Leipzig (Germany)
70mm (22x) AB: 2020-04-11: At 12x no separation possible, because the bright primary component outshines the companion. At 22x clearly separated, but still quite close together.
Robert Zebahl
Leipzig (Germany)
102mm (28x) First pastel sketch (Pitt pastel by Faber-Castell) of a double star on black paper, where also the halos were sketched around the stars. The stars themselves were redrawn with an Edding (Edding 1500, Soft Pastel white). The sketch shows the components A to D. ../projects/double-stars/robert-zebahl/sketches/2019-08-14_mizar_alcor.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) AB: mit viel Schwarz zwischen den Beugungsscheiben (1“9) ../projects/double-stars/uwe-pilz/sketches/zetaUMa.jpg
Jörg S. Schlimmer
Germany
127mm (87x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Alkor-Mizar_ausschnitt_filtered.jpg
Sarah Gebauer
Germany
150mm (83x) AB: einfacher, aber sehr schöner Doppelstern, Komponenten A und B mit 14,4'' Abstand stehen mit schönen Feldsternen zusammen im Bild ../projects/double-stars/sarah-gebauer/sketches/20200409%20Zeta%20UMa%20DSk.jpg
Werner E. Celnik
Rheinberg (Germany)
120mm ../projects/double-stars/werner-celnik/photographs/zetaUMa%202001-07-01%202130UT%20Refr_120-2000%20Fuji100%203s%20A8076%20kl.jpg
Robert Zebahl
Leipzig (Germany)
../projects/double-stars/robert-zebahl/photographs/2020-04-06_zeta_uma.jpg
★★ A567 6m2 9m7 1.5'' 257° 2019 Com 13h32m48.21s +24°20'48.30"
Christopher Hay
Seeheim (Germany)
150mm (96x) At a position angle of roughly 265° I had the feeling something was going on; a kind of protusion of the primary, coming and going. 200x: yes, now a stellar condensation kept popping in and out of sight at the same position, just on the outside of the first ring, which itself was coming and going in not-so-perfect seeing. Upping the magnification to 240x and 300x didn't improve the view.
Mark McCarthy
Fremont (California/USA)
203mm (333x) Excellent pair, bright yellow-white A. B is resolved with seeing just beyond first diffraction ring, ~1.5"
Mark McCarthy
Fremont (California/USA)
317mm (553x) very faint B, very close, ~1" when seeing stills, 3-4 delta magnitude. Surprised it is not so difficult. B looks like it doesn't have any light of its own and is illuminated by A.
BU114 8m1 8m2 1.3'' 173° 2018 Vir 13h34m17.72s -08°37'07.40"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Nice near equal, slightly yellow white stars, ~10th mag. In 80mm finder it is shown with another widely separated equal pair.
HJ1234 AB 6m4 10m5 28.6'' 2008 CVn 13h34m21.87s +38°47'21.30"
Mark McCarthy
Fremont (California/USA)
317mm (277x) B a faint blue orb, looks like a planet reflecting A's light. Yellow A. Nice!
25 CVn STF1768 AB 5m0 7m0 1.6'' 93° 2019 CVn 13h37m27.70s +36°17'41.40"
STF1768 AC 5m0 11m6 214.3'' 321° 2015
KZA73 AD 5m0 13m0 335.6'' 92° 2015
KZA73 AE 5m0 12m7 369.5'' 139° 2015
KZA73 AF 5m0 9m4 437.3'' 118° 2015

../images/binary-star-orbits/STF1768-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
60mm (160x) AB: 2020-03-16: 102/1122mm ED refractor stopped down to 60mm. The diffraction ring of the primary component is virtually invisible. The companion appears only in few moments as an extremely faint, elongated brightening in the diffraction ring. Very difficult. Telescope should be in very good optical condition!
Robert Zebahl
Leipzig (Germany)
70mm (160x) AB: 2020-03-16: 102/1122mm ED refractor stopped down to 70mm. Companion only visible as a subtle, elongated, not permanently visible brightening. The diffraction ring of the primary component is only visible occasionally. Difficult. Telescope should be in good optical condition!
Robert Zebahl
Leipzig (Germany)
80mm (160x) AB: 2020-03-16: 102/1122mm ED refractor stopped down to 80mm. Companion permanently visible as elongated brightening in the diffraction ring. But the diffraction ring itself appears rather faint. Moderately difficult.
Robert Zebahl
Leipzig (Germany)
90mm (160x) AB: 2020-03-16: 102/1122mm ED refractor stopped down to 90mm. Companion quite clearly recognizable as elongated brightening in diffraction ring. Relatively simple.
Robert Zebahl
Leipzig (Germany)
102mm (160x) AB: 2020-03-16: The faint companion is immediately recognizable as a distinct, slightly elongated brightening in the diffraction ring. Easy.
Robert Zebahl
Leipzig (Germany)
152mm (150x) AB: 2020-03-19: At 150x the clearly fainter companion is visible as a roundish brightening. Due to the chromatic aberration of the achromat (152mm f/5.9) the companion is almost outshined. At 180x the companion is then well, at 225x and 300x very well visible as a tiny separated star.
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: Very tight pair, a little more than hairline split, ~2 delta mag.
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: Very tight pair, a little more than hairline split, ~2 delta mag. 8" 333x: white and dull blue, ~1", Nice!
Frederik Wanink
Itterbeck (Germany)
254mm (640x) AB: schwierig wegen Helligkeitsunterschied ../projects/double-stars/frederik-wanink/sketches/25CVn.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) AB: Very pretty pale yellow and orange, 2-3 delta mag, ~2"
STF1763 AB 7m8 8m1 2.7'' 39° 2017 Vir 13h37m35.30s -07°52'16.60"
AC 7m8 12m3 138.9'' 327° 2015
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 64x zeigt sich in guten Momenten eine schöne 8 - bei 107x ein schönes enges, knapp getrenntes Paar zweier gleich heller Sterne
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: 81 Vir: near equal orange stars, ~3", 9th mag. Nice!
STF1772, 1 Boo AB 5m8 9m6 4.4'' 134° 2017 Boo 13h40m40.50s +19°57'20.40"
AC 5m8 12m2 87.5'' 26° 2015
AD 5m8 7m4 208.4'' 2010
Robert Zebahl
Leipzig (Germany)
70mm (22x) AD: 2020-04-24: Very widely split with clearly visible difference in brightness. The primary component appeared white-yellowish, the companion pale orange.
Christopher Hay
Seeheim (Germany)
80mm (63x) AB: B pops in and out of view as a very fine pinprick of light reasonably well set off from A. No success at 50x.
Christopher Hay
Seeheim (Germany)
150mm (96x) AB: Well split. Remarkably easy considering the 4-mag difference in brightness. A seems dusky yellow. B perhaps bluish, but hard to determine. 9-mag star a few arcminutes to the north makes the view even more pleasing. According to Stelledoppie AB is a physical double.
Mark McCarthy
Fremont (California/USA)
203mm (333x) AB: 1 Boo. Odd colors. Blue-white to greenish stars, wide, about 3 delta mag. AC is the very faint star well separated at nearly a right angle PA from the AB pair
Karsten Kopp
Köln (Germany)
600mm (180x) AB: Im CLT bei 180 x kein Problem. Der Reiz hier macht den größeren Helligkeitsunterschied von knapp 4 mag aus. Auch die Farben, der hellere erstrahlt eher weiß und der schwächere schwach rotbraun, sind schön anzusehen.
Berthold Fuchs
Wiesbaden (Germany)
130mm AB: difficult DS ../projects/double-stars/berthold-fuchs/photographs/STF%201772.jpg
★★ STF1777, 84 Vir 5m5 8m3 2.7'' 227° 2015 Vir 13h43m03.71s +03°32'16.40"
Uwe Pilz
Leipzig (Germany)
105mm (200x) deutliche Aufhellung im 1. Ring, nicht sonderlich schwierig ../projects/double-stars/uwe-pilz/sketches/200516_84Vir.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Light orange and blue-green B, large magnitude difference, ~3". Pretty.
Gerd Kohler
Langenzenn (Germany)
254mm (218x) Blasses rot - eventuell rötlich. Enges Paar. Deutlicher Helligkeitsunterschied.
S654 AB 5m6 8m9 71.3'' 239° 2018 CVn 13h46m59.77s +38°32'33.70"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein weit getrenntes Pärchen - B im Südwesten ist deutlich schwächer und farblos ggü. der weiß strahlenden Komponente A
Mark McCarthy
Fremont (California/USA)
317mm (277x) Striking yellow-orange and blue-green fainter B.
HJ1244 AB 6m9 10m8 6.9'' 130° 2015 CVn 13h53m20.79s +42°11'05.30"
Mark McCarthy
Fremont (California/USA)
317mm (277x) Wow! Very faint B but can hold it direct vision with the seeing. Well separated from and orange-yellow A.
STF1788 AB 6m7 7m3 3.7'' 101° 2019 Vir 13h54m58.20s -08°03'31.90"

../images/binary-star-orbits/STF1788-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (47x) Very nice view! Pretty tight together with a moderate difference in brightness.
René Merting
Drachhausen (Germany)
100mm (64x) bei 107x zeigt sich ein schönes, knapp getrenntes Pärchen - B im Osten ist nur knapp schwächer als A - Komponente A ist weiß, B ist grau, wirkt aber auch leicht gelb gefärbt - zurück auf 64x kann ich die beiden Sterne auch schon knapp getrennt erkennen
Mark McCarthy
Fremont (California/USA)
317mm (340x) bright pair of near equal magnitude, both yellow-while color.
BU224 8m9 9m3 0.6'' 101° 2016 Boo 14h13m26.94s +12°34'26.20"

../images/binary-star-orbits/BU224-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) Hairline split with seeing, light yellow-white stars, noticeable mag difference. Snowman when seeing is not stable
STF1821, kappa Boo, 17 Boo, Asellus Tertius AB 4m5 6m6 13.8'' 235° 2019 Boo 14h13m29.00s +51°47'23.80"

../images/binary-star-orbits/STF1821-AB-orbit.jpg

René Merting
Drachhausen (Germany)
18x70 Komponente A strahlt so hell, dass B deutlich schwächer ganz knapp im SW von A abgesetzt sichtbar ist - Helligkeitsunterschied schätzungsweise 3 Magnituden (nur 2.09 mag laut Stelle Doppie)
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-24: Clearly separated with significant difference in brightness. The primary component showed a pale yellowish-orange color with a greyish companion. To the southeast there is the double star STFA 26.
Sarah Gebauer
Germany
100mm (73x) sehr schön zusammen mit STFA 26 in einem Gesichtsfeld bei 73x, dabei sehr schön getrennt ../projects/double-stars/sarah-gebauer/sketches/STF1821%20und%20STFA26.jpg
Uwe Pilz
Leipzig (Germany)
105mm (144x) weiß-grau, trennbar bei 22x
Karsten Kopp
Köln (Germany)
600mm (180x) Im CLT leicht zu trennen. Beider Sterne erscheinen weißlich.
STT279 6m8 9m1 2.2'' 257° 2018 Boo 14h13m49.46s +11°59'51.90"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Fine pair, white A and slightly peach color B, ~2" separated and ~3 delta mag
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very pretty orange and blue, 2-3", PA SW 2 delta mag
STF1816 7m4 7m8 0.4'' 100° 2019 Boo 14h13m54.63s +29°06'19.50"

../images/binary-star-orbits/STF1816-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (88x) gelb ../projects/double-stars/uwe-pilz/sketches/stf1816.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Rod-shaped equal white. July 2017
★★ A1101 AB 9m7 10m3 0.3'' 224° 2018 Boo 14h15m50.57s +10°17'59.30"

../images/binary-star-orbits/A1101-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) I stared for a long time and had brief instants of an elongation or bump, and even a tentative split of a star. Sketched the orientation will check the PA later [I think I have it. My orientation on the sketch is in the correct position as in relation to the AB-C & AB-D pairs.]
★★ STF1830 & STF1831 STF1831 AB 7m2 9m6 5.8'' 138° 2017 UMa 14h16m08.47s +56°42'45.70"
STF1831 AC 7m2 6m7 112.2'' 219° 2017
STF1831 CD 6m7 13m1 112.1'' 116° 2016
STF1830 CE 6m7 9m3 138.0'' 245° 2016
STF1830 EF 9m3 10m3 10.6'' 312° 2017
STF1830 EG 9m3 12m2 35.2'' 81° 2017
Christopher Hay
Seeheim (Germany)
7x45 STF1831 (AC): Wide split at 7x but still a very distinct impression of being a double. No colour impression. Two fine pinpricks of light, rather attractive in 8° FOV.
According to Stelledoppie the A-C pair, at 509 light years distance to us, is the only physical pair in the whole STF 1830/1831 complex. A nice physical double for small binoculars.
Robert Zebahl
Leipzig (Germany)
8x40 STF1831 (AC): 2020-04-05: Fairly wide pair with slight differences in brightness and color. C appeared slightly orange, A on the other hand slightly bluish. Comparatively bright double star, which gives a nice view.
Robert Zebahl
Leipzig (Germany)
55mm (27x) STF1831 (AC): 2020-04-05: Moderate difference in brightness. C: pale orange, A: subtle blue.
Robert Zebahl
Leipzig (Germany)
70mm (57x) 2020-04-11: At 22x the components AB, C, E & F are well visible and widely separated. E & F are comparatively faint. The C component in the middle appeared white-yellowish, AB rather white with a slight tendency to blue. At 57x, the pair AB with a clear difference in brightness can be easily split. An altogether rewarding and unusual multiple system. ../projects/double-stars/robert-zebahl/sketches/2020-04-11_stf1830_stf1831.jpg
Uwe Pilz
Leipzig (Germany)
105mm (88x) Komponente G erforderte 200x ../projects/double-stars/uwe-pilz/sketches/200411stf1830.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) STF1831 (AB): One pair close to another, 5" and 2 delta mag. Part of a widely separated equal pair, and a gang of three stars further away -- five additional pairings in the system.
René Merting
Drachhausen (Germany)
320mm (72x) EF: bei 72x ein schwaches Sternpaar, gut getrennt - E ist gelblich, F eine halbe Größenklasse schwächer und grau
EG: bei 72 ist nordöstlich von EF noch ein ganz schwacher Lichtpunkt erkennbar - G hat ungefähr mit dreifachem Abstand EF
René Merting
Drachhausen (Germany)
320mm (72x) AB: bei 144x ist B ein bisschen mehr als knapp getrennt im SO von A erkennbar - B ist deutlich schwächer und grau gegen den weißgelblich strahlenden A - zurück auf 72x kann ich die beiden auch noch extrem knapp getrennt erkennen in guten Momenten - ein schönes Doppel zusammen mit STF1830 EF
AC: bei 72x fällt die helle Komponente C im Südwesten von AB zwar auf, ich hätte aber nicht vermutet, dass der Stern dazu gehört
STFA26, iota Boo, 21 Boo AB 4m8 7m4 39.0'' 33° 2017 Boo 14h16m10.07s +51°22'01.30"
Robert Zebahl
Leipzig (Germany)
8x40 2020-04-05: Even with tripod the faint companion was not visible.
Robert Zebahl
Leipzig (Germany)
16x70 2021-03-21: Very beautifully embedded in a group of bright and medium bright stars. Significant difference in brightness. Primary component appeared white-yellowish, the much fainter companion grey-bluish at best.
René Merting
Drachhausen (Germany)
18x70 ein schönes ungleiches Paar, aber Komponente B ist deutlich besser abgesetzt von A erkennbar als beim Nachbar-DS STF1821 - leichter Farbkontrast
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-24: Similar view to the northwest standing kappa Boo. Nicely separated with larger distance and fainter companion. The primary component appeared rather white.
Sarah Gebauer
Germany
100mm (73x) bei 73x weit getrennt mit sichtbarem Helligkeitsunterschied, passt zusammen mit STF1821 in ein Gesichtsfeld und ist sehr schön anzusehen ../projects/double-stars/sarah-gebauer/sketches/STF1821%20und%20STFA26.jpg
Uwe Pilz
Leipzig (Germany)
105mm (144x) sehr weit, auffallend bei 22x
STF1825 6m5 8m4 4.2'' 154° 2019 Boo 14h16m32.84s +20°07'18.70"

../images/binary-star-orbits/STF1825-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) Cream white A and light blue B, wide ~5", ~2 delta mag
Mark McCarthy
Fremont (California/USA)
317mm (277x) White and orange, 3 delta mag, well split.
★★ STF1835 & BU1111 STF1835 A-BC 5m0 6m8 6.2'' 196° 2018 Boo 14h23m22.74s +08°26'47.90"
BU1111 BC 7m4 7m7 0.3'' 16° 2018

../images/binary-star-orbits/BU1111-BC-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (64x) STF1835 (A-BC): bei 32x erscheint der Stern leicht unrund, verschmiert - bei 107x präsentiert sich BC gut getrennt im Süden von A - Helligkeitsunterschied eine Größenklasse (1.75 mag laut Stelle Doppie) - bei 64x sind beide Sterne auch getrennt erkennbar, BC strahlt warmweiß
Robert Zebahl
Leipzig (Germany)
102mm (62x) STF1835 (A-BC): At 28x barely split with visible difference in brightness. At 62x easy to separate. The colors seemed similar.
Mark McCarthy
Fremont (California/USA)
317mm (277x) STF1835 (A-BC): In a line of three stars, white and slightly red B. Wide, ~6", 2 delta mag. Did not detect BC 0.3"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) BU1111 (BC): Short period pair, it is a component of STF 1835. I get a nothed near equal elongation with a clear direction in relation to the A star. Very cool
Karsten Kopp
Köln (Germany)
600mm (180x) STF1835 (A-BC): Doppelstern konnte im CLT gut getrennt werden. Helligkeitsunterschied ist merklich, aber nicht extrem. Der hellere erscheint eher weißlich und der kleinere eher bläulich. Der Farbunterschied ist aber minimal.
Berthold Fuchs
Wiesbaden (Germany)
130mm STF1835 (A-BC): close DS ../projects/double-stars/berthold-fuchs/photographs/STF%201835.jpg
HO542 10m3 10m3 0.9'' 35° 2017 Boo 14h27m33.26s +20°37'07.20"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Faint near equal, very finely split with seeing, bluish stars
★★ zeta Boo STF1865 AB 4m5 4m5 0.3'' 282° 2019 Boo 14h41m08.92s +13°43'42.00"
H6 104 AB-C 4m5 11m0 104.3'' 260° 2015

../images/binary-star-orbits/STF1865-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (88x) AB-C ../projects/double-stars/uwe-pilz/sketches/zetaBoo.jpg
Mark McCarthy
Fremont (California/USA)
508mm (1067x) AB: Zeta Boo. Short period. First impression was moderately well notched overlapping disks (eg. not barely notched, but not strongly notched either). With more time observing & getting used to the image, and in moments of better seeing, the notch became more distinct. It would not separate in spite of moments of better seeing. I could also see the elongation, but only subtly notched due to the smaller scale, at 667x
★★ HU575 AB 9m8 10m1 0.5'' 152° 2011 Boo 14h42m33.63s +19°28'46.90"

../images/binary-star-orbits/HU575-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Short period. Small, faint, but definite split of these orange-red near equal stars. I sketched a clear orientation to field stars. Awesome
A1109 AB 7m4 9m4 1.9'' 88° 2017 Vir 14h42m47.60s +06°35'26.40"

../images/binary-star-orbits/A1109-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) Both stars light yellow, big magnitude difference, ~3-4 delta mag, about 2". Not difficult
★★ STF1877, epsilon Boo, Izar AB 2m6 4m8 2.8'' 347° 2018 Boo 14h44m59.14s +27°04'29.90"
Robert Zebahl
Leipzig (Germany)
55mm (125x) The fainter component was seen as permanent brightening on the first diffraction ring of the primary component.
Robert Zebahl
Leipzig (Germany)
60mm (192x) Easy to split, whereby the much fainter component lies on the first diffraction ring of the primary component. The primary component itself appeared slightly yellowish. ../projects/double-stars/robert-zebahl/sketches/2018-04-10_epsilon_boo.jpg
Robert Zebahl
Leipzig (Germany)
70mm (133x) Easy to split, very unequal. A appeared in pale orange, B was visible as a very tiny, grey star on the first diffraction ring of component A.
René Merting
Drachhausen (Germany)
100mm (142x) bei 107x erscheint die B-Komponente nordwestlich leicht angesetzt an der gelblich strahlenden Komponente A - bei 142x dann ist die Trennung komplett, B liegt schön auf einem abgesetzten Beugungskranz von Komponente A
Stefan Loibl
Rosenheim (Germany)
102mm (205x) nice contrast yellow-orange/blue
Robert Zebahl
Leipzig (Germany)
102mm (224x) 2021-05-12: Primary component appears in bright orange, the well separated, much fainter companion at 187x grey-bluish, at 224x and higher in a very nice, pale blue.
Robert Zebahl
Leipzig (Germany)
120mm (192x) At 85x the fainter component was easily visible but not separated. At 192x well split. The fainter component was almost on the first diffraction ring of the primary component. Quite big difference in brightness. I did not looked at the color of the components.
Sarah Gebauer
Germany
150mm (166x) weder mit 166x noch mit 250x im April 2020 getrennt
Gerd Kohler
Langenzenn (Germany)
254mm (346x) Gelblich - leicht bläulich. Enges Paar. Deutlicher Helligkeitsunterschied.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) deutl. Farbkontrast blau gelb ../projects/double-stars/frederik-wanink/sketches/Izar.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Izar: Yellow-orange and blue, very pretty, as always
Karsten Kopp
Köln (Germany)
600mm (257x) Sehr einfaches und auffälliges Objekt. Dieser Doppelstern war für mich an diesem Abend das Highlight. Vor allem, weil der schwächere hellblaue Stern gerade knapp neben den Spikes des helleren gelben Sterns steht. ../projects/double-stars/karsten-kopp/sketches/STF1877.jpg
Berthold Fuchs
Wiesbaden (Germany)
130mm magnificent DS ../projects/double-stars/berthold-fuchs/photographs/eps%20Bootis.png
★★ HLD20, 5 Lib 6m5 10m1 4.7'' 249° 2001 Lib 14h45m57.78s -15°27'34.40"
Mark McCarthy
Fremont (California/USA)
508mm (333x) 8" 205x Orange star but no companion. 20" 333x Seeing distorted but a much fainter orange star seen as a point outside the diffraction, 5-6", Very fine! Put 8" mask back on @ 333x and can't see the B star!
STF1884 6m6 7m5 2.1'' 58° 2019 Boo 14h48m23.37s +24°22'01.00"

../images/binary-star-orbits/STF1884-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (64x) bei 64x ist der Doppelstern als 8 erkennbar, 107x reicht dann für die knappe Trennung - die B-Komponente im NO ist nur unwesentlich schwächer - ein sehenswertes Pärchen
Robert Zebahl
Leipzig (Germany)
102mm (86x) At 86x pretty tight and unequal. At 160x clearly split. A: white, B: slightly orange.
Mark McCarthy
Fremont (California/USA)
203mm (333x) Prototypical pair, >1 delta mag, ~3" separation, white to off white color
Frederik Wanink
Itterbeck (Germany)
254mm (640x) einfach ../projects/double-stars/frederik-wanink/sketches/STF1884.jpg
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern konnte gerade so getrennt werden. Beide Sternen leuchten weißlich.
STF1890, 39 Boo 6m3 6m7 2.5'' 46° 2019 Boo 14h49m41.37s +48°43'15.60"

../images/binary-star-orbits/STF1890-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (67x) 2020-04-01: At 44x elongated, partly notched. At 67x split, but very tight. A difference in brightness was not seen. At 133x clearly separated with little difference in brightness. A appeared pale yellow, B rather warm-white.
Robert Zebahl
Leipzig (Germany)
70mm (100x) 2020-04-18: At 57x very finely separated with extremely tightly spaced components that appeared equally bright. At 100x a very nice pair with little difference in brightness. Fantastic sight! The color of the components was slightly different: creamy-white & a touch of yellow-orange.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) gleich hell ../projects/double-stars/frederik-wanink/sketches/39Boo.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Bright white pair, well split
★★★ alpha Lib, Zubenelgenubi, Kiffa Australis, Lanx Australis SHJ186 AB 2m7 5m2 231.1'' 314° 2012 Lib 14h50m52.78s -16°02'29.80"
AOT53 AC 2m7 12m5 275.6'' 291° 2000

Component A: 9 Lib, alpha 2 Lib
Component B: 8 Lib, alpha 1 Lib
The standardized name Zubenelgenubi only refers to alpha 2 Lib.

Christopher Hay
Seeheim (Germany)
naked eye AB: Noticed with naked eye and without prior PA knowledge that a secondary was flickering next to Zubenelgenubi. Unexpected and first naked-eye sighting. Checked position with binoculars to be sure. Further naked-eye look at Mizar/Alkor (Zeta UMa) to gauge my momentary acuity and assess the difference to Alpha Lib. Zeta UMa more easily and widely split than ever before, and Alkor appeared for the first time bluish, so this was an exceptional night for naked-eye double-star splitting. Three-star rating awarded because Zubenelgenubi is the second-best naked-eye true-physical double star in the summer sky after Mizar/Alkor.
Christopher Hay
Seeheim (Germany)
10x56 AB: Handheld. A strong, wide pair. Both cold white, the secondary more bluish than the primary.
Delightful in 6.3° FOV together with the "Zub's Hat" (Hay-Merting 9) asterism directly above (north of) the pair, an array of six stars looking very much like a hat or cap on Zubenelgenubi.
Gerd Kohler
Langenzenn (Germany)
254mm (76x) AB: Bläulich-weiß - leicht bläulich.
Gerd Kohler
Langenzenn (Germany)
254mm (76x) AC: Bläulich-weiß - weiß. Sehr schwacher Begleiter.
STF1886 AB 7m6 9m7 7.9'' 224° 2018 Boo 14h51m02.31s +09°43'25.20"
Robert Zebahl
Leipzig (Germany)
102mm (28x) At 28x, the B component appeared rather faint and pretty close to the primary component. At 62x both components were clearly visible and unequal. A: slightly orange, B: greyish.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow-orange and orange, pretty wide ~10" 2 delta mag
Karsten Kopp
Köln (Germany)
600mm (180x) Einfach zu trennen, aber der Helligkeitsunterschied mit 2,1 mag ist auffällig. Der hellere Stern erscheint gelblich weiß und der schwächere rotbraun. Sehr schön.
Berthold Fuchs
Wiesbaden (Germany)
130mm close DS ../projects/double-stars/berthold-fuchs/photographs/STF%201886.jpg
xi Boo, 37 Boo STF1888 AB 4m8 7m0 5.2'' 298° 2019 Boo 14h51m23.38s +19°06'01.70"
STF1888 AC 4m8 13m8 71.3'' 340° 2015
STF1888 AD 4m8 11m7 160.8'' 286° 2015
ARN11 AE 4m8 8m7 271.5'' 98° 2015
ARN11 AF 4m8 9m2 337.5'' 37° 2015
STF1888 BC 7m0 13m8 63.9'' 340° 2001
STF1888 BE 7m0 8m7 273.5'' 102° 2009

../images/binary-star-orbits/STF1888-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (44x) AB: 2020-04-24: Beautifully separated with quite a large difference in brightness in a lovely star field. The primary component shines yellowish with a faint companion.
Sarah Gebauer
Germany
150mm (83x) AB: die 6'' entfernten Komponenten A und B konnten mühelos bei 83x getrennt werden, Komponente E war zu sehen, C, D und F waren nicht sichtbar ../projects/double-stars/sarah-gebauer/sketches/20200416%20Xi%20Boo%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
508mm (333x) AB: Xi Boo. Short period. Richly colored yellow and orange stars, ~1 delta mag, ~5" separation, with several other stars in view. Very pretty
Karsten Kopp
Köln (Germany)
600mm (180x) AB: Ein recht schöner Doppelstern, wobei neben dem Helligkeitsunterschied von 2,2 mag auch die Sternfarben ein schönes Gesamtbild geben. Der hellere Stern erstrahlt gelblich weiß und der schwächere orangegelb.
Hier handelt es sich auch um ein recht nahes System mit 21,9 Lichtjahren Entfernung.
../projects/double-stars/karsten-kopp/sketches/STF1888.jpg
STT287 8m4 8m6 0.6'' 2019 Boo 14h51m27.53s +44°55'42.60"

../images/binary-star-orbits/STT287-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Wow! Hair-split, ~0.7", near equal to half a delta mag.
HO389 7m0 10m5 1.6'' 88° 2010 Boo 14h52m07.44s +20°17'26.50"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Extremely faint B resolves with best seeing as a tiny faint point outside first diffraction. Very tough, very excellent object
Mark McCarthy
Fremont (California/USA)
317mm (553x) Definite split of much fainter pair, ~1.5", somewhat lost in diffraction, but there!
A2071, EQ Boo 9m3 9m9 1.3'' 273° 2017 Boo 14h52m25.79s +17°57'23.30"
Mark McCarthy
Fremont (California/USA)
203mm (333x) EQ Boo. ! Very fine pair nicely split, ~1", ~1 delta mag
BU31 AB 8m5 10m3 2.0'' 222° 2017 Boo 14h52m30.05s +18°44'19.50"

../images/binary-star-orbits/BU31-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) White A and light yellow B, finely split, ~2 delta mag
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern konnte gerade so getrennt werden. Die Distanz von 2,0 Bogensekunden und die Helligkeit beider Sterne, macht die Sichtung nicht leicht.
STF1909, 44 Boo 5m2 6m1 0.3'' 95° 2019 Boo 15h03m47.30s +47°39'14.60"

../images/binary-star-orbits/STF1909-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) 2015 getrennt zu sehen (1") ../projects/double-stars/frederik-wanink/sketches/44Boo.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) I Boo. Figure 8 to hair split, ~0.9". This pair shrinking separation fast, will be <0.5" in a couple of years. Only 40 LY away. (July 2017)
STF1908 AB 9m2 10m3 1.3'' 152° 2015 Boo 15h04m56.30s +34°28'02.70"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Wow! superfine B split with seeing, light orange stars. B is very faint next to A, a significant delta, >1"
BU119 AB 8m1 8m8 2.3'' 274° 2019 Lib 15h05m31.91s -07°00'48.80"

../images/binary-star-orbits/BU119-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) Tried 667x at first but it was too much power, too dim and seeing too choppy. 333x was perfect, clean and well split ~2" near equal, slightly orange
Mark McCarthy
Fremont (California/USA)
203mm (333x) 8" 667x Too much power, too dim and seeing too choppy. 8" 333x perfect, clean and well split ~2" near equal, slightly orange.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very like BU 346. well split near half delta mag yellow stars, 2.5"
A690 10m0 10m5 0.9'' 10° 2000 Boo 15h09m09.80s +28°08'48.20"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Very tough, seems fainter than 9th and 10th mag as given in SkyTools (and indeed it is, both fainter by another half mag), and also closer than 1". With seeing only, significant delta mag, and very close, hairline only
★★ STF1930, 5 Ser AB 5m1 10m1 11.1'' 36° 2017 Ser 15h19m18.79s +01°45'55.50"
Stefan Loibl
Rosenheim (Germany)
102mm (68x) Messier 5 in the same FOV, wonderful
Mark McCarthy
Fremont (California/USA)
203mm (333x) Light yellow bright A, very much fainter orangish B, wide separation. Near M5.
STF1937, eta CrB AB 5m6 6m0 0.4'' 264° 2019 CrB 15h23m12.23s +30°17'17.70"
Mark McCarthy
Fremont (California/USA)
203mm (667x) 8" 333x Suspect elongation. 8" 667x definite egg shape. 20" 667x Can't get a good focus.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) deutlich als 8 zu sehen, 2015 0,6" ../projects/double-stars/frederik-wanink/sketches/EtaCrB.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Close orange pair, equal mag, snowman shape
Mark McCarthy
Fremont (California/USA)
317mm (553x) Overlapping / notched orange-yellow stars. Used apodising mask.
★★ mu Boo, 51 Boo, Alkalurops CHR181, mu 1 Boo Aa-Ab 4m3 0.1'' 188° 2012 Boo 15h24m29.54s +37°22'37.10"
STFA28, mu 1 Boo AB 4m3 7m1 109.0'' 172° 2018
STF1938, mu 2 Boo Ba-Bb 7m1 7m6 2.3'' 2019

../images/binary-star-orbits/CHR181-Aa-Ab-orbit.jpg ../images/binary-star-orbits/STF1938-Ba-Bb-orbit.jpg

Robert Zebahl
Leipzig (Germany)
8x40 STFA28 (AB): Easily split with obvious difference in brightness.
René Merting
Drachhausen (Germany)
16x70 STFA28 (AB): weit getrenntes Pärchen, aufgrund der großen Helligkeitsunterschiedes schöner Farbkontrast - Komponente A im Norden gelblich, B im Süden mehr grau-braun
Robert Zebahl
Leipzig (Germany)
70mm (22x) STFA28 (AB): Evident, very wide apart and unequal. A: white-yellowish, B: grey.
Robert Zebahl
Leipzig (Germany)
102mm (125x) STF1938 (Ba-Bb): Beautiful view! This triple system includes STFA 28 and STF 1938. ../projects/double-stars/robert-zebahl/sketches/2019-04-04_mu_boo.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) ein heller 4m und zwei nahe dunkle 7m, lohnend.
Robert Zebahl
Leipzig (Germany)
120mm (23x) STFA28 (AB): Easy to split with large angular distance and noticeable difference in brightness.
Sarah Gebauer
Germany
150mm (125x) A-BC mit 109'' sind bei 125x sehr weit getrennt, es ist der Ansatz eines engen Doppelsterns zu erkennen, der sich mit 2,2'' Abstand auch bis 250x nicht auftrennen ließ
Mark McCarthy
Fremont (California/USA)
203mm (205x) STFA28 (AB): Bright A star does not seem round. The B star is a tight equal pair, pretty set. [Aa,Ab is CHR 181 0.1", and I'd be shocked if I actually detected it. STFA 28 is technically the bright star and the tight pair, the tight pair is Ba,Bb = STF 1938, 7.09/7.63, 2.2"]
Mark McCarthy
Fremont (California/USA)
203mm (205x) STFA28 (AB): Bright A star does not seem round (CHR181). B star is a tight equal pair (STF1938 Ba-Bb). Pretty set. STFA 28 is technically the bright star and the tight pair
Mark McCarthy
Fremont (California/USA)
203mm (205x) CHR181 (Aa-Ab): Bright A star does not seem round (CHR181). B star is a tight equal pair (STF1938 Ba-Bb). Pretty set. STFA 28 is technically the bright star and the tight pair
Mark McCarthy
Fremont (California/USA)
203mm (205x) STF1938 (Ba-Bb): Bright A star does not seem round (CHR181). B star is a tight equal pair (STF1938 Ba-Bb). Pretty set. STFA 28 is technically the bright star and the tight pair
Frederik Wanink
Itterbeck (Germany)
254mm (640x) STF1938 (Ba-Bb): 3er System, schön ../projects/double-stars/frederik-wanink/sketches/STF1938.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) STFA28 (AB): Bright white star with tight yellow pair STF 1938 as its companion.
Mark McCarthy
Fremont (California/USA)
317mm (553x) STFA28 (AB): Striking. Bright star with near equal double STF 1938 paired with it. A star is a spectroscopic binary
Mark McCarthy
Fremont (California/USA)
317mm (553x) STF1938 (Ba-Bb): Near equal close but well split double also paired with STFA28
Karsten Kopp
Köln (Germany)
600mm (257x) Hier handelt es sich um ein Dreifachsternsystem, welches jetzt aber nicht durch eine besondere Färbung der Sterne auffällt. Die A - B/C Komponenten stehen noch sehr weit auseinander, wobei auch die A-Komponente um einiges heller erscheint. Die beiden Komponenten B/C sind wesentlich näher beieinander und unterscheiden sich auch kaum in ihrer Helligkeit. ../projects/double-stars/karsten-kopp/sketches/mu%20Boo.jpg
★★ STF1941 9m7 9m8 1.4'' 212° 2017 CrB 15h25m42.81s +26°37'40.50"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Faint, very close equal pair, ~1.5". Nice!
★★ STT296 AB 7m8 9m1 2.1'' 274° 2019 Boo 15h26m26.56s +44°00'13.20"
AC 7m8 12m7 80.7'' 313° 2016

../images/binary-star-orbits/STT296-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: Very fine but well split, ~2", yellow-white A, reddish B, 2 delta mag.
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: Very fine but well split, ~2", yellow-white A, reddish B, 2 delta mag.
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: ! Beautiful white A and dusky yellow B, well split ~2", ~2 delta. Very pretty star
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Very beautiful, 2", 2 delta mag, with very faint third (AC) seen with averted vision widely separated.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AC: Very beautiful, 2", 2 delta mag, with very faint third (AC) seen with averted vision widely separated.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Close near equal, 1 delta mag, white.
JEF1, bet CrB 3m7 5m2 0.3'' 140° 2019 CrB 15h27m49.85s +29°06'19.80"
Mark McCarthy
Fremont (California/USA)
762mm (457x) Suspect out of roundness in the star disk. Tried with and without a hexagon mask
★★ STF1950 8m1 9m2 3.3'' 92° 2019 Ser 15h29m58.46s +25°30'31.10"
Mark McCarthy
Fremont (California/USA)
317mm (277x) Very fine orange pair 2 delta mag, ~1.5". B appears fine and delicate.
STT298 AB 7m2 8m4 1.3'' 187° 2017 Boo 15h36m02.22s +39°48'08.90"
AB-C 6m9 7m8 120.4'' 328° 2017
AB-D 6m9 13m9 167.4'' 224° 2002
AB-E 6m9 12m1 456.0'' 335° 2002

../images/binary-star-orbits/STT298-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
102mm (28x) AB-C: Wide, moderately unequal pair. Little difference in color: Primary components appeared a bit more orange colored.
Robert Zebahl
Leipzig (Germany)
120mm (23x) AB-C: Easy to split with large angular distance and noticeable difference in brightness.
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: At zenith, but worth the effort to slew to. Another great 2+1. The tight pair [AB] is near equal and split a little more than a hairline
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: One component of compicated 6 star system, some of which is split in 80mm finter. This is a close equal pair, ~2".
★★ STF1964 & HU1167 HU1167 AB 8m1 9m9 1.4'' 80° 2016 CrB 15h38m12.91s +36°14'48.60"
STF1964 AC 8m1 8m1 14.5'' 90° 2017
STF1964 AD 8m1 9m0 15.1'' 84° 2018
STF1964 CD 8m1 9m0 1.5'' 21° 2019

../images/binary-star-orbits/HU1167-AB-orbit.jpg ../images/binary-star-orbits/STF1964-CD-orbit.jpg

René Merting
Drachhausen (Germany)
18x70 STF1964 (AC): zu erkennen sind zwei gleich helle, sehr dicht stehende Sterne - Trennung ein wenig mehr als knapp
René Merting
Drachhausen (Germany)
100mm (20x) STF1964 (AC): bei 20x ein gut getrenntes Pärchen gleich heller Sterne, auffallend im Sternumfeld
Robert Zebahl
Leipzig (Germany)
102mm (62x) STF1964 (AC): Rather wide pair, equal without visible difference in color.
Uwe Pilz
Leipzig (Germany)
105mm (16x) Dreifachstern nicht trennbar
Robert Zebahl
Leipzig (Germany)
120mm (23x) STF1964 (AC): Nice double star, well split with equally bright components.
Mark McCarthy
Fremont (California/USA)
317mm (277x) STF1964 (AC): Well split equal pair. I suspect B is pair as it is an elongated orange smear at 277x -- it is STF 1964CD.
Mark McCarthy
Fremont (California/USA)
317mm (553x) STF1964 (CD): Faint near equal pair about 3" separation. In the same field with HU 1167. Magnificent
Mark McCarthy
Fremont (California/USA)
317mm (553x) HU1167 (AB): Bright star with much fainter pair, about 1" separation, 3-4 delta mag. In same field with STF 1964. Magnificent
STF1965, zeta 2 CrB 5m0 5m9 6.3'' 306° 2019 CrB 15h39m22.68s +36°38'09.00"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein knapp getrenntes deutlich helleres Pärchen als der 27' südwestlich stehende Doppelstern STF1964 - Komponente B ist gut eine Größenklasse schwächer als A - beide Komponenten schmiegen sich meist noch aneinander, aber in guten Momenten sind beide getrennt sichtbar - zurück auf 20x ist ein länglicher Stern erkennbar
Robert Zebahl
Leipzig (Germany)
102mm (28x) At 28x very tight and barely split, unequal. At 86x very nice view. No difference in color: both components appeared white.
Stefan Loibl
Rosenheim (Germany)
102mm (68x) Elongated at 28x, split with 68x. Component A blue, B reddish. At 68x double star STF1964 in the same FOV ../projects/double-stars/stefan-loibl/sketches/ZetaCrB_20200601.jpg
Robert Zebahl
Leipzig (Germany)
120mm (48x) Very nice double star, well split with noticeable difference in brightness.
Mark McCarthy
Fremont (California/USA)
317mm (277x) Bright white, well separated, ~1 delta mag.
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern konnte gut getrennt werden. Der Helligkeitsunterschied ist nicht sehr groß und der etwas hellere Stern erscheint weißlich und der schwächere geht eher ins bläulich weiße.
STF1967, gam CrB 4m0 5m6 0.5'' 110° 2015 CrB 15h42m44.57s +26°17'44.30"

../images/binary-star-orbits/STF1967-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (667x) Definite mis-shape, oval to egg, observation made June 2019
★★ STT301 7m5 10m4 4.0'' 27° 2017 Boo 15h46m13.64s +42°28'06.30"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Wide magnitude difference, ~4 delta mag. B is faint but well split, ~5"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Wide mag difference, ~4 delta mag. B is faint but well split, ~5".
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wow. Relatively bright A, orange, with a very faint B which shimmers and sparkles to view with averted vision and held with direct. B star is small, 4-5 delta mag, 6-8"
★★ STF1973 7m6 8m8 30.8'' 320° 2015 CrB 15h46m24.50s +36°26'45.60"
René Merting
Drachhausen (Germany)
18x70 ein gut getrenntes Sternpaar - Komponente A im Südosten ist doppelt so hell wie B - ganz leichter Farbkontrast
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x sind beide Sterne gut getrennt erkennbar - schöner Farbkontrast zwischen beiden ungleich hellen Sternen
Uwe Pilz
Leipzig (Germany)
105mm (53x) blaugrün-orange, trennbar bei 15x ../projects/double-stars/uwe-pilz/sketches/stf1973.jpg
Robert Zebahl
Leipzig (Germany)
120mm (23x) Nice double star, easy to split with noticeable difference in brightness.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wide, 1 delta magnitude white.
BU621 7m9 9m4 0.6'' 27° 2018 Boo 15h49m49.96s +44°31'19.50"
Mark McCarthy
Fremont (California/USA)
508mm (667x) nice, split with seeing, 2 delta mag, very close, very slightly orange and yellow stars.
SKF1311 5m3 10m3 74.8'' 300° 2015 Ser 15h50m17.55s +02°11'47.50"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Cool. Bright yellow-orange star broken up by seeing and with a water vapor glow (sky is deteriorating). Much fainter B star hanging at edge of halo.
BU810 9m1 10m8 1.6'' 84° 2016 Her 15h51m00.24s +42°27'59.50"
Mark McCarthy
Fremont (California/USA)
508mm (667x) Very cool, light orange and blue, close but very good split. 2 delta mag.
H3 7, beta Sco AC 2m6 4m5 13.4'' 20° 2019 Sco 16h05m26.23s -19°48'19.40"
Christopher Hay
Seeheim (Germany)
15x45 Stabilised binoculars, handheld. Difficult handheld in this instrument, but clearly split and attractive as such. Tripod mounting would surely help and make the difference for a nice pair for this magnification. One of the earliest doubles split, found by Benedetto Castelli in 1627, but according to Stelledoppie not a physical double (in contrast to the very tight BU 947 AB pair in the system, which is physical, with a separation of 0.3” in 2020 and 0.4” in 2030 – and the wide PWL 9001 AD pair with a separation of 518” – A, B and D are thus a physical triple). “H“ in the catalogue name means that this double star is listed in the catalogue of W. Herschel. The 3 in the name means that it is a double star of the 3rd Class [separation 5'' - 15''] in Herschel’s system.
Sarah Gebauer
Germany
150mm (85x) unspektakulär, mit 85x einfach zu trennen, wenige Feldsterne ../projects/double-stars/sarah-gebauer/sketches/20200717%20Beta%20Sco%20DSk.jpg
COU1276 10m9 12m9 3.3'' 53° 2015 CrB 16h08m52.28s +37°58'00.80"
Mark McCarthy
Fremont (California/USA)
508mm (667x) Good find, B star only visible averted vision, flashes out obvious and clear.
STF2015 AB 8m2 9m5 3.0'' 159° 2019 Her 16h08m54.75s +45°21'11.80"
AC 8m2 13m8 8.9'' 102° 2015
BC 9m5 13m8 9.0'' 102° 2007
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 107x ist Komponente B südlich von A knapp getrennt erkennbar - Helligkeitsunterschied eine knappe Größenklasse, dadurch wirkt B nicht ganz so reinweiß wie A
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: ! Blue-white A and white-blue B (which is to say A is white with a tinge of blue, and B is blue with a tinge of white) ~3", ~2 delta mag
Karsten Kopp
Köln (Germany)
600mm (180x) AB: Doppelstern ist gut zu trennen. Der Helligkeitsunterschied ist merklich, aber nicht markant. Der hellere leuchtet weißlich und der schwächere eher gelblich.
STF2025 8m0 9m8 2.6'' 164° 2015 Her 16h11m11.71s +47°33'36.10"
René Merting
Drachhausen (Germany)
100mm (107x) bei 107x wird mit viel Konzentration Komponente B südlich von A ganz knapp getrennt und wie ein Schatten bzw. wie eine zarte Andeutung erkennbar - bei 142x habe ich vergeblich versucht, B noch einmal zu erblicken - schwer
Mark McCarthy
Fremont (California/USA)
203mm (205x) ! Very delicate pair, large delta mag, close ~2", B held with direct vision after foveal coaxing. Not far away is another bright white star about same magnitude as A, but is not paired with it
Mark McCarthy
Fremont (California/USA)
317mm (553x) Unrelated wide near equal white pair split in finder, but one has a very faint ~2 delta mag 2-3" companion and is the AB pair. Nice!
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern konnte gut getrennt werden. Beide Komponente wirken weißlich.
nu Sco, 14 Sco, Jabbah BU120 AB 4m3 5m3 1.3'' 2019 Sco 16h11m59.74s -19°27'38.30"
H5 6 AC 4m3 6m6 41.3'' 336° 2019
MTL2 CD 6m6 7m2 2.4'' 56° 2019
Christopher Hay
Seeheim (Germany)
15x45 AC: Stabilised binoculars, handheld. Widely separated. Nice pair reminiscent of Beta Lyrae at 10x. Also split clearly in stabilised handheld 10x42, but view not as pleasing as in 15x45.
Christopher Hay
Seeheim (Germany)
15x60 AC: Wide split. Secondary faint blue, a fine contrast to the very slightly yellowish-white primary.
René Merting
Drachhausen (Germany)
18x70 AC: ein schönes Sternpaar mit einem leichten Farbkontrast - Komponente A im SSO ist leicht gelblich, die schwächere C-Komponente weißbläulich - A ist nicht ganz rund, aber das kann auch vom FG herrühren
STF2021, 49 Ser AB 7m4 7m5 4.0'' 358° 2019 Her 16h13m18.45s +13°31'37.20"

../images/binary-star-orbits/STF2021-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (57x) Lovely split. Almost equal pair with relatively close components.
René Merting
Drachhausen (Germany)
100mm (64x) bei 32x zeigen sich zwei gleich helle weiße Sterne, die sich gerade noch berühren - bei 64x dann knappe Trennung, B ist nur minimal schwächer
Mark McCarthy
Fremont (California/USA)
203mm (205x) 49 Ser. Light yellow orange, near equal, bright, wide ~4". Physical, 1354 year period
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern ist gut zu trennen, bei fast identischer Helligkeit. Ein weißliches Augenpaar schaut mich an.
COU1450 10m5 11m8 1.3'' 59° 2013 Her 16h16m25.97s +43°25'25.50"
Mark McCarthy
Fremont (California/USA)
508mm (333x) ! Very fine pair, slight mag difference, close ~2"
★★ nu CrB, nu 1/2 CrB, 20 CrB STFA29 AB 5m4 5m6 354.7'' 164° 2011 CrB 16h22m21.42s +33°47'56.90"
HN 81 AC 5m4 12m6 68.1'' 241° 2002
STFA29 AD 5m4 11m5 277.1'' 153° 2002
H6 18 BD 5m6 11m5 98.2'' 16° 2015
René Merting
Drachhausen (Germany)
18x70 AB: auffallend, zwei gleichhelle Sterne weit getrennt - die südliche Komponente strahlt zartgelb
René Merting
Drachhausen (Germany)
320mm (72x) AB: bei 72x ein weit auseinander stehendes helles Pärchen - die nördliche Komponente ist leicht heller - diesen Doppelstern macht die relativ gleiche hellgelbe Färbung beider Komponenten aus - was diesen Doppelstern noch ausmacht, dass beide hellen Komponenten einen schwachen Begleiter haben
AC: bei 72x blinkt bei der nördlichen A-Komponente südwestlich ein schwacher Lichtpunkt auf, Abstand ordentlich
BD: bei 72x steht bei der südlichen B-Komponente ein schwacher Lichtpunkt nordöstlich, D ist etwas weiter entfernt, als der Abstand AC - ein schickes Quartett
Mark McCarthy
Fremont (California/USA)
508mm (667x) STFA29 (AD): Nu 1 CrB. Nice bright orange finder split. AD is a wide faint star in the scope
BU951 AB-C 9m3 10m1 1.0'' 30° 2016 CrB 16h23m32.23s +33°21'27.80"
Mark McCarthy
Fremont (California/USA)
508mm (667x) Wow seeing is amazing getting airy disks 20 inch 667x, orange and blue stars, very nice split, dare I say wide (AB is near equal 0.1" pair, try again to notice out of round)
★★ STF2054 AB 6m2 7m1 1.0'' 350° 2018 Dra 16h23m47.19s +61°41'47.00"
Robert Zebahl
Leipzig (Germany)
70mm (133x) Not split in any way.
Robert Zebahl
Leipzig (Germany)
102mm (160x) Immediately visible as a double star. The diffraction disks overlapped slightly. The difference in brightness was clearly visible. Together with the nearby double star eta Dra in the same field of view, the sight was highly fascinating, as both double stars are very different in their appearance. ../projects/double-stars/robert-zebahl/sketches/2019-06-25_stf2054.jpg
Uwe Pilz
Leipzig (Germany)
105mm (198x) verformte Beugungsscheibe, auf den ersten Blick erkennbar ../projects/double-stars/uwe-pilz/sketches/stf2054.jpg
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt
★★ STT312, eta Dra, 14 Dra AB 2m8 8m2 4.4'' 143° 2015 Dra 16h23m59.51s +61°30'50.70"
Robert Zebahl
Leipzig (Germany)
70mm (133x) Not split in any way.
Robert Zebahl
Leipzig (Germany)
102mm (160x) Easy. Very large difference in brightness. The faint companion appeared as a tiny star outside the first diffraction ring of the primary component. Highly recommended, especially with the nearby double star STF 2054! ../projects/double-stars/robert-zebahl/sketches/2019-06-25_eta_dra.jpg
★★ TDS9883 11m7 11m9 0.8'' 299° 1991 CrB 16h24m38.78s +31°59'42.90"
Mark McCarthy
Fremont (California/USA)
508mm (667x) Very extraordinarily fine, only at the best moments, a very close pair hairline split, very faint.
★★★ rho Oph, 5 Oph H2 19 AB 5m1 5m7 3.0'' 334° 2017 Oph 16h25m35.03s -23°26'47.00"
H2 19 AC 5m1 7m3 149.2'' 2000
H2 19 AD 5m1 6m8 156.4'' 252° 2000
KOU63 CF 5m8 11m7 4.8'' 206° 2000
BU1115 DE 6m8 8m4 0.3'' 196° 2018

../images/binary-star-orbits/H2-19-AB-orbit.jpg ../images/binary-star-orbits/BU1115-DE-orbit.jpg

Stefan Loibl
Rosenheim (Germany)
102mm (102x) AB: possible components (DE) and (CF) already visible at 27x magnification with ca. 2 arcmin distance
STF2048 AB 6m6 9m7 5.6'' 297° 2015 Oph 16h28m48.99s -08°07'43.20"
AC 6m6 12m7 130.6'' 302° 2015
René Merting
Drachhausen (Germany)
100mm (107x) AB: schlechtes Seeing bzw. unerwartet heftiger Tanz der Sterne - erst bei 107x kann ich Komponente B ganz schwach west-nordwestlich von A erkennen - großer Helligkeitsunterschied - die Trennung hat keine Freude bereitet
Stefan Loibl
Rosenheim (Germany)
102mm (102x) AB: nice faint pair, both components orange
STF2052 AB 7m7 7m9 2.5'' 118° 2018 Her 16h28m52.67s +18°24'50.60"
AC 7m7 11m8 141.4'' 41° 2015

../images/binary-star-orbits/STF2052-AB-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 64x zwei gleichhelle Sterne, die sich gerade so berühren - bei 107x ein knapp getrenntes Pärchen, Komponente B im SO ist nur marginal schwächer
Stefan Loibl
Rosenheim (Germany)
102mm (102x) AB: Does not appear as a multiple star at 28x, elongated at 68x, splith with 102x. Component A blueish, B reddish. Observation of component C questionable. Occasional observation of a star at the presumably correct position.
Mark McCarthy
Fremont (California/USA)
317mm (277x) AB: Pretty pale yellow-orange pair of equal magnitude, about 2" separation.
Karsten Kopp
Köln (Germany)
600mm (180x) AB: Doppelstern war noch gut zu trennen, bei fast identischer Helligkeit. Komponente A wirkt weißlich, während die etwas schwächere Komponente B gelblich orange strahlt.
lambda Oph, 10 Oph, STF2055, Marfic AB 4m2 5m2 1.4'' 44° 2019 Oph 16h30m54.84s +01°59'02.80"

../images/binary-star-orbits/STF2055-AB-orbit.jpg

Stefan Loibl
Rosenheim (Germany)
102mm (205x) components cannot be split at 205x
Uwe Pilz
Leipzig (Germany)
105mm (288x) schöner Farbkontrast, lohnend. ../projects/double-stars/uwe-pilz/sketches/190721LambdaOph.jpg
Sarah Gebauer
Germany
150mm (160x) habe den Doppelstern zwar gefunden und konnte auch erkennen, dass es zwei Sterne sind, eine Trennung war aber heute Abend nicht möglich
Mark McCarthy
Fremont (California/USA)
203mm (205x) Marfic. Nice blazing white pair, ~1 delta, ~2". 129 year period, but not much change in the next few years
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/Marfic.jpg
STF2059 8m8 8m8 0.3'' 179° 2016 Her 16h30m55.71s +38°03'52.60"

../images/binary-star-orbits/STF2059-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) nicht als DS gesehen
Mark McCarthy
Fremont (California/USA)
317mm (553x) Overlapping disks, notched. Need perfect seeing. This was 1.2" at Struve's discovery, so easier for him to see -- I doubt he would have found it now, near its closest separation. August 2017
STT313 8m0 8m3 0.9'' 128° 2018 Her 16h32m33.19s +40°06'47.70"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) mit Zwischenraum zu sehen ../projects/double-stars/frederik-wanink/sketches/STT313.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Clean split, near equal pair. Nice
★★★ 16/17 Dra STFA30, 16/17 Dra AC 5m4 5m5 90.2'' 193° 2018 Dra 16h36m13.72s +52°55'27.80"
STF2078, 17 Dra AB 5m4 6m4 3.3'' 104° 2018
Christopher Hay
Seeheim (Germany)
3x63 Clean split. Separation is much clearer than that of Nu1/2 Dra (STFA35), which is also in 14° FOV and is hair-fine split.
A physical double at a distance to us of 412 light years.
Christopher Hay
Seeheim (Germany)
7x45 A well split and nicely compact pair. When 16/17 Dra is put at the edge of the 8.6° field of view, Nu1/2 Dra stands at the opposite edge. Their comparison thus suggests itself. 16/17 is somewhat wider than Nu1/2. While the components of Nu1/2 are of equal brightness and whiteness, those of 16/17 display a slight difference in both brightness and colour. 17 (A) first seems bluer than 16 (C), but after 20 seconds this impression flips to C and from then on goes back and forth.
Robert Zebahl
Leipzig (Germany)
55mm (27x) STFA30 (AC): Rather wide pair with almost equal components. C component appeared slightly yellowish-orange.
Robert Zebahl
Leipzig (Germany)
55mm (71x) Grand sight! ../projects/double-stars/robert-zebahl/sketches/2019-05-18_16_17_dra.jpg
Christopher Hay
Seeheim (Germany)
80mm (30x) 16 Dra seems more bluish than 17 Dra, the latter seems slightly yellow in comparison and is distinctly elongated. At 84x 17 Dra is cleanly split and such a delightful view together with 16 Dra that I had no desire to ramp up the magnification. All three stars belong to a physical system.
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 64x noch ein Stäbchen, bei 107x ist B dann knapp getrennt östlich von A erkennbar - B ist auch noch relativ hell bzw. maximal eine Magnitude schwächer
AC: bei 32x weit auseinander stehend - Komponente C im Süden ist maximal eine viertel Magnitude schwächer - leichter Farbkontrast, A weißgelb und C kühlweiß
Frederik Wanink
Itterbeck (Germany)
254mm (640x) STF2078 (AB): sehr schönes Dreiersystem ../projects/double-stars/frederik-wanink/sketches/17Dra.jpg
ES632 11m3 11m7 2.2'' 104° 2015 Her 16h40m50.12s +50°13'40.60"
Mark McCarthy
Fremont (California/USA)
508mm (333x) ! Very fine, noticeable magnitude difference, ~2", very nice
STF2084, zeta Her, 40 Her 3m0 5m4 1.6'' 110° 2019 Her 16h41m17.16s +31°36'09.80"

../images/binary-star-orbits/STF2084-orbit.jpg

Sarah Gebauer
Germany
100mm (136x) auf Anhieb ganz haarscharf getrennt, aber leider nur wenige Sekunden haltbar; dennoch erfolgreiche Trennung!
Robert Zebahl
Leipzig (Germany)
102mm (224x) Faint companion as distinct brightening on the first diffraction ring visible. In steadier moments visible as small, round condensation. ../projects/double-stars/robert-zebahl/sketches/2019-06-30_zeta_her.jpg
Robert Zebahl
Leipzig (Germany)
102mm (280x) After a longer, concentrated observation, a permanent brightening of the first diffraction ring of the primary component could be seen at the correct position angle. The brightening appeared only arch-shaped without any noticeable condensation. ../projects/double-stars/robert-zebahl/sketches/2019-06-25_zeta_her.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) äußerst schwierig
Uwe Pilz
Leipzig (Germany)
105mm (288x) Bei sehr ruhiger Luft ohne Probleme sichtbar, trotz der störenden Restkoma meines Refraktors ../projects/double-stars/uwe-pilz/sketches/190721ZetHer.jpg
Mark McCarthy
Fremont (California/USA)
203mm (533x) Zeta Her. B was seen, not too difficult as a disk within the diffraction of bright A, just outside first ring so ~1.5", like a diamond ring, significant mag difference
Frederik Wanink
Itterbeck (Germany)
254mm (640x) nicht als DS gesehen
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF2084.jpg
René Merting
Drachhausen (Germany)
320mm (320x) in der Nacht konnte ich nur bis 320x gewinnbringend vergrößern - Komponente A zeigt schöne Beugungsscheibchen, B offenbarte sich mir nicht
STF2094 AB 7m5 7m9 1.0'' 76° 2018 Her 16h44m10.57s +23°31'02.80"
AC 7m5 11m7 24.9'' 312° 2015
Mark McCarthy
Fremont (California/USA)
203mm (333x) AC: Wide separation, 1 delta mag, 333x (AC seen, missed the tight A pair 1")
Mark McCarthy
Fremont (California/USA)
317mm (277x) AB: White-orange pair of equal magnitude, clean split when the seeing stills
Mark McCarthy
Fremont (California/USA)
317mm (277x) AC: ~25" separated, bluish about 3 magnitudes fainter than A
René Merting
Drachhausen (Germany)
320mm (320x) AB: bei 320x sind beide Komponenten knapp getrennt voneinander erkennbar - sie sind etwa gleich hell
STF2095 7m4 9m2 5.3'' 160° 2015 Her 16h45m05.23s +28°21'28.90"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Nice! Yellow and white pair, 2 delta mag, 4"
CTT20 & ES1089 ES1089 AB 10m7 11m7 11.8'' 150° 2015 Her 16h46m28.63s +47°59'24.00"
ES1089 AC 10m7 12m7 32.4'' 29° 2015
CTT20 AD 10m7 10m8 71.1'' 127° 2015
CTT20 DE 10m8 12m5 27.2'' 126° 2015
CTT20 EF 12m5 12m7 34.5'' 34° 2015
René Merting
Drachhausen (Germany)
320mm (72x) DE: bei 72x sind 5 Sterne der Herkules-Box (Leiter 6) getrennt voneinander erkennbar, u.a. auch die beiden Komponenten D und E - Komponente E bildet die südliche Ecke der Box, D liegt nahe E auf der Geraden zwischen A und E
EF: bei 40x zeigt sich der Herkules-Box noch als nebliger Strich - bei 72x ist Komponente E getrennt nordöstlich von Komponente E zu erkennen - F bildet die nordöstliche Ecke des Rechtecks
René Merting
Drachhausen (Germany)
320mm (160x) AB: bei 160x wird die Herkules-Box (Leiter 6) sehr deutlich, ES 1089 zeigt sich als schön getrenntes Sternpaar im NW
AC: das einzige physikalische Doppel in dieser Sechser-Gruppierung - bei 72x können die beiden Komponenten getrennt gesehen werden, sie bilden die westliche kurze Kante des Musters Leiter 6
Mark McCarthy
Fremont (California/USA)
508mm (333x) ES1089 (AB): ! Nice little cluster of six near same magnitude stars with a couple fainter mixed in, this one the faintest pair and closest in, ~2", ~1 delta. Not physical
★★ 52 Her A1866 BC 9m5 9m6 0.3'' 266° 2012 Her 16h49m14.20s +45°59'00.40"
BU627 A-BC 4m8 8m4 2.2'' 44° 2018

../images/binary-star-orbits/A1866-BC-orbit.jpg ../images/binary-star-orbits/BU627-A-BC-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (142x) BU627 (A-BC): bis 142x probiert, hat nicht funktioniert - der Helligkeitsunterschied ist vermutlich zu groß und das Beugungsscheibchen von A so hell wie BC selbst
Robert Zebahl
Leipzig (Germany)
102mm (280x) BU627 (A-BC): At 160x the faint component is already beginning to be visible as brightening in the first diffraction ring. At 280x the brightening is quite clearly visible and appears partly clear as a small knot in the first diffraction ring.
Uwe Pilz
Leipzig (Germany)
105mm (288x) BU627 (A-BC) ../projects/double-stars/uwe-pilz/sketches/52Her.jpg
Uwe Pilz
Leipzig (Germany)
120mm (180x) BU627 (A-BC) ../projects/double-stars/uwe-pilz/sketches/52Her_120_%20180x.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) BU627 (A-BC): 52 Her. B seen quite well, though only with seeing when bright white A's diffraction settles. B is a bluish disk ~2", very steady for a moment then lost again. Looking too long direct seems to make B disappear, A overpowers one's vision, but with a little averted vision B comes back into view. 1977 year period
Mark McCarthy
Fremont (California/USA)
317mm (553x) BU627 (A-BC): 52 Her. Very bright white star with a companion disk 2", 4-5 delta mag. Wow! B appears as if it is illuminated by A's light. Did not detect BC, 0.3"
★★ STF2103 AB 5m9 10m0 4.9'' 43° 2018 Her 16h49m34.67s +13°15'40.30"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Nice! Pretty bright white A, much fainter 5 delta mag B, well separated, looks like a planet.
★★ STF2107 AB 6m9 8m5 1.5'' 109° 2018 Her 16h51m50.10s +28°39'58.70"

../images/binary-star-orbits/STF2107-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow and orange pair, very close ~1.5", 1 delta mag. Very pretty.
Mark McCarthy
Fremont (California/USA)
508mm (667x) Nice pair yellow and slightly blue two delta mag, about 1.5" (AC is 11.5 and much further separated)
Karsten Kopp
Köln (Germany)
600mm (385x) Doppelstern ist bei 180-facher Vergrößerung gerade so als 8 zu erkennen. Bei 385-facher Vergrößerung in den seltenen Augenblicken des ruhigen Seeings gerade so eben zu trennen. Sehr schwierig auch wegen des Helligkeitsunterschied von 1,6 mag.
BU821 9m8 10m5 1.3'' 324° 2016 Her 16h51m50.65s +31°50'36.30"
Mark McCarthy
Fremont (California/USA)
203mm (205x) ! Nice, exceedingly fine split at this low magnification, noticeable mag difference, white stars. Burnham discovered with 15.5-inch Washburn
★★ BU822 AB 6m6 9m9 1.4'' 227° 2010 Her 17h03m52.67s +19°41'25.80"
Mark McCarthy
Fremont (California/USA)
317mm (277x) Bright orange star with a consistent pin-prick point of light, stays still in occasional seeing shimmer. Fainter than PRY 2's B. ~1.5". In same field as PRY 2, same PA as PRY 2's.
★★ PRY2 AB 6m2 9m3 1.8'' 227° 2012 Her 17h04m41.34s +19°35'56.70"
Mark McCarthy
Fremont (California/USA)
317mm (277x) Blue-white and slightly reddish B, 3-4 delta mag, 1.5". Not hard at all! Makes a double-double with BU 822 at 277x
★★ mu Dra, 21 Dra, Alrakis, Arrakis STF2130 AB 5m7 5m7 2.5'' 2018 Dra 17h05m20.20s +54°28'14.30"
BU1088 AC 5m7 13m7 12.2'' 174° 2015

../images/binary-star-orbits/STF2130-AB-orbit.jpg

Christopher Hay
Seeheim (Germany)
80mm (100x) In May 2019 neatly split, no colours seen. A physical system with a period of 812 years. Periastron was in 1946, since then the distance is widening to reach 2.7“ in 2025 and 2.8“ in 2030
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 107x zeigen sich zwei knapp getrennte Perlchen, beide gleichhell und weiß schimmernd - ein schickes Paar
Robert Zebahl
Leipzig (Germany)
102mm (125x) AB: Easy to separate. Beautiful sight. Components equally bright with no discernible color difference.
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: Mu Dra. "Arrakis" (which was the name of the planet in the book Dune, but means "Dancer" in Arabic). Light yellow-orange stars, well split, equal. 812 year period
Frederik Wanink
Itterbeck (Germany)
254mm (460x) AB: gleich hell ../projects/double-stars/frederik-wanink/sketches/STF2130.jpg
STT324 6m0 10m7 3.6'' 222° 2016 Her 17h08m00.70s +31°12'22.50"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Very interesting. At 20 inch the a star was orange and bloated with the seeing, did not notice a pair. I used the 8 inch mask which tightened the A star up considerably, then with averted vision could discern a very faint small glow in one particular direction, but could not hold it direct. Back to the 20" and now in good moments I can see the B star quite well, 5 delta mag, bluish. 333x
STF2142 AB 6m2 9m3 4.9'' 110° 2018 Her 17h11m40.26s +49°44'46.70"
René Merting
Drachhausen (Germany)
100mm (64x) bei 64x offenbart der Stern seine Doppelsternseele - östlich von Komponente A ist knapp getrennt ein ganz schwacher Lichtpunkt sichtbar - gut 3-4 Größenklassen Unterschied zwischen den beiden - ein ungleiches Paar, aber schön anzusehen
Mark McCarthy
Fremont (California/USA)
203mm (205x) White star and ~3 detla mag, well separated, a little reddish color
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern konnte gut getrennt werden. Der Reiz bei diesem Doppelstern liegt bei dem sehr deutlichen Helligkeitsunterschied von über 3 mag. Komponente A erstrahlt weißlich und Komponente B leicht rötlich.
★★ HO557, AK Her 8m6 12m0 4.5'' 323° 2015 Her 17h13m57.81s +16°21'01.00"
Mark McCarthy
Fremont (California/USA)
317mm (553x) B only visible with averted vision. As I drift from averted back to direct the star fades and I can only hold direct for a moment before it disappears. Very interesting effect. ~5" and 4 delta mag.
Mark McCarthy
Fremont (California/USA)
508mm (205x) AK Her. White A and much fainter orange B, interesting pair. It is an uncertain pair yet WDS shows a period of 58.8 years, +/- 8 years.
★★ STF2140, alpha Her, 64 Her, Ras Algethi AB 3m5 5m4 5.0'' 103° 2019 Her 17h14m38.86s +14°23'24.90"

../images/binary-star-orbits/STF2140-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
55mm (41x) Well split with noticeable difference in brightness.
René Merting
Drachhausen (Germany)
100mm (64x) bei 32x ist noch nichts erkennbar - bei 64x wird östlich von Rasalgethi der schwache Begleiter B knapp getrennt sichtbar - A ist strahlend gelb, B mit einer Tendenz zum gelb, eher ein warmes weiß
Uwe Pilz
Leipzig (Germany)
105mm (88x) himmelblau und hellgelb, getrennt bei 53x ../projects/double-stars/uwe-pilz/sketches/191025_alphaHer.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) gelb-lachsfarben
Robert Zebahl
Leipzig (Germany)
120mm (100x) Easily split with noticeable difference in brightness. A: intensively orange colored, B: slightly orange.
Karsten Kopp
Köln (Germany)
140mm (94x) Konnte erst mit 94-facher Vergrößerung gut getrennt wahrgenommen werden.
Sarah Gebauer
Germany
150mm (85x) bei Halbmond auf der Schwäbischen Alb: sehr eng, aber sauber getrennt, eine Komponente ist viel heller und größer, mein Farbeindruck ist allerdings unerwartet eher gelb
Sarah Gebauer
Germany
150mm (160x) richtig gold, es strahlt mich richtiggehend an, auch sehr schön getrennt, ein toller Doppelstern! ../projects/double-stars/sarah-gebauer/sketches/20200805%20Alpha%20Her%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
203mm (667x) Rasalgethi. 8" inch mask due to seeing. AB orange and blue 4 delta mag. Faint AD seen very wide separation. pretty star.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) gelblich und bläulicher Stern ../projects/double-stars/frederik-wanink/sketches/AlphaHer.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Rasalgethi, Bright orange A & pale green much fainter B. Very nice!
Karsten Kopp
Köln (Germany)
600mm (135x) Leicht zu trennen. Komponente A erscheint orange, Komponente B gelblich.
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern ist gut zu trennen. Komponente A erstrahlt orange und Komponente B gelblich. ../projects/double-stars/karsten-kopp/sketches/STF2140.jpg
Jens Leich
Germany
130mm ../projects/double-stars/jens-leich/photographs/Doppelstern_Rasalgethi_Herkules_220719_2159UT_RGB.jpg
★★ STF3127, delta Her, 65 Her AB 3m1 8m3 13.7'' 293° 2019 Her 17h15m01.92s +24°50'22.50"
René Merting
Drachhausen (Germany)
100mm (64x) was für ein schönes ungleiches Paar - bei 64x präsentiert sich Komponente A gleißend hell und weiß, B zeigt sich gut abgesetzt westlich von A - zurück auf 32x habe ich bei der Strahlkraft von A keine Chance mehr, B zu erkennen - sehr schick ab 64x
Stefan Loibl
Rosenheim (Germany)
102mm (68x) Faint component B is not visible at 26x. At 68x B is visible and split. Component A yellowish. ../projects/double-stars/stefan-loibl/sketches/DeltaHer_20200601.jpg
Robert Zebahl
Leipzig (Germany)
102mm (86x) Easy. Pretty wide apart with large difference in brightness. ../projects/double-stars/robert-zebahl/sketches/2019-06-23_delta_her.jpg
Mark McCarthy
Fremont (California/USA)
203mm (667x) Very bright yellow white A and bluish B at least four delta mag, wide separation. I don't think it would be seen but for the mask tightening A's diffraction
Mark McCarthy
Fremont (California/USA)
317mm (553x) Sarin. Very bright and much fainter B, looks like a planet
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern gut zu trennen. Der Reiz von diesem Doppelstern liegt im schon extremen Helligkeitsunterschied von über 5 mag. Komponente A erstrahlt weiß und die Komponente B leicht rötlich.
★★ STT328, 68 Her 4m7 10m3 4.5'' 56° 2017 Her 17h17m19.57s +33°06'00.40"
René Merting
Drachhausen (Germany)
100mm (142x) erst bei 142x ist B ganz selten als schwacher Begleiter nordöstlich von A zu erkennen - schwierig
Mark McCarthy
Fremont (California/USA)
203mm (205x) 68 Her. ! Very nice, white stars. Very bright A, B like a planet, a point of light, well separated from A
Mark McCarthy
Fremont (California/USA)
317mm (553x) Faint but steadily held B, ~8", 4 delta mag. Nice!!
BU629 9m0 10m0 1.2'' 340° 2015 Her 17h17m29.38s +32°05'11.30"
Mark McCarthy
Fremont (California/USA)
203mm (205x) ! Fine split and with seeing, significant mag difference, ~1". Burnham discovered with Dearborn 18.5-inch @ 0.99"
STF2147 7m1 11m0 3.0'' 93° 2011 Her 17h17m34.65s +28°54'47.70"
Mark McCarthy
Fremont (California/USA)
203mm (205x) ! V944 Her. Very nice bright light yellow-orange A, B is vey much fainter but can just see directly. Wide ~5", really nice sight
★★ HEI246 11m0 11m5 0.7'' 32° 1994 Her 17h18m13.17s +15°58'13.70"
Mark McCarthy
Fremont (California/USA)
508mm (667x) Wow! very nice just nearly unequal close but well split orange stars. one is obviously fainter than the other but not by much
★★★ BU628 9m5 9m6 0.6'' 262° 2016 Her 17h18m22.22s +32°39'38.50"

../images/binary-star-orbits/BU628-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Wow split clean, amazing. No resolution at 667x but at 1067x two airy disks, sep by half disk, half delta mag. Remarkable
★★★ COU994 9m4 11m2 0.5'' 214° 2011 Her 17h19m44.04s +37°02'37.30"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) At very best moments A presents a perfect disk, and a point resolves within the first faint diffraction ring, very faint and small Amazing.
★★★ A2088 9m9 10m0 0.4'' 2011 Her 17h20m32.37s +47°38'51.50"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) sharp and clean split in best moments, seeing lasts a couple seconds. Otherwise it's touching disks.
COU415 8m8 9m8 0.2'' 248° 2010 Her 17h22m04.55s +23°09'40.40"

../images/binary-star-orbits/COU415-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Notched elongation at 533x & 667x. I get an instantaneous split with perfect seeing at 1067x, it stays notched. ~1 delta. 90 year period.
STF2161, 75 Her, rho Her AB 4m5 5m4 4.1'' 321° 2019 Her 17h23m40.97s +37°08'45.30"
Robert Zebahl
Leipzig (Germany)
55mm (38x) Very nice view. Easily split with visible difference in brightness. Pretty tight. Component A appeared rather white, B slightly yellowish. The double star forms with two other, fainter field stars a conspicuous, acute-angled triangle, whereby the double star marks the tip.
René Merting
Drachhausen (Germany)
100mm (64x) bei 107x sind beide Komponenten klar getrennt erkennbar - Komponente B im NW ist eine knappe Größenklasse schwächer - A creme-weiß, B kühler weiß-bläulich - zurück auf 64x kann ich den Doppelstern auch schon ganz knapp getrennt erkennen, da war ich wohl nicht mutig genug, dass ich mit 107x begonnen habe
Sarah Gebauer
Germany
150mm (170x) der typische Doppelstern für mich, er bildet mit zwei ählich hellen Sternen ein schönes, langes und spitzes Dreieck ../projects/double-stars/sarah-gebauer/sketches/20200723%20Rho%20Her%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
203mm (667x) Rho Her. Light yellow white stars 1 delta mag well separated.
★★ A2184 & LBU5 A2184 AB 7m3 10m6 1.6'' 41° 2018 Her 17h27m32.79s +16°27'24.50"
LBU5 AC 7m3 11m5 49.3'' 259° 2015
Mark McCarthy
Fremont (California/USA)
317mm (553x) LBU5 (AC): Was trying for A 2184, but it is 2" and 3.26 delta mag, and I did not see. Wide faint pair LBU 5 seen
Mark McCarthy
Fremont (California/USA)
508mm (667x) A2184 (AB): Wow! real nice when seeing stills and with some critical focusing the diffraction of the star tightens and the three delta mag B shows on its own as a sharp point well separated and round. Really great view
★★ STFA35, nu Dra, nu 1/2 Dra, 24/25 Dra 4m9 4m9 62.1'' 311° 2017 Dra 17h32m15.88s +55°10'22.10"
Christopher Hay
Seeheim (Germany)
3x63 Hair-fine split.
A physical double at a distance to us of 99 light years.
Christopher Hay
Seeheim (Germany)
7x45 Well split and very compact. A very evenly matched pair, both colourless. Attractive in 8.6° FOV together with the rest of the head of the dragon, namely Beta, Gamma and Xi Dra (Rastaban, Etamin, Grumium).
Christopher Hay
Seeheim (Germany)
10x42 Clearly split, components of identical brightness, no colour. One of the finest doubles for 10x.
René Merting
Drachhausen (Germany)
16x70 der Doppelstern ist bereits mit bloßem Auge zu erkennen, im FG dann offenbart sich ein ordentlich getrenntes Pärchen zweier gleich heller Sterne
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein schönes, auffallendes Pärchen zweier gleich heller Sterne - beide sind komfortabel getrennt erkennbar und präsentieren sich weiß
Robert Zebahl
Leipzig (Germany)
102mm (28x) Wide, bright, equal pair. Both components looked cream-white. Due to the distance a double for binoculars.
Christopher Hay
Seeheim (Germany)
125mm (80x) Gorgeous sight, widely split, dominating the FOV. The more northern B-component (=Nu1 Dra = 24 Dra) appears brighter and more yellowish than the A-component (=Nu2 Dra = 25 Dra).
Sarah Gebauer
Germany
150mm (85x) auf den ersten Blick "zwei Augen", die mich anleuchten, ansonsten aufgrund der wenigen Feldsterne eher unspektakulär ../projects/double-stars/sarah-gebauer/sketches/20200624%20Ny%20Dra%20DSk.jpg
★★★ COU1594 10m7 10m6 0.5'' 332° 2010 Her 17h33m59.60s +44°28'45.60"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Needed to wait for seeing but a very extraordinarily fine point resolves with the best seeing, seems much fainter than data but it's definitely there, a hard point.
ES1257 AB 10m4 10m9 2.5'' 297° 2018 Her 17h38m13.95s +45°00'23.30"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Very cool. First noticed is a wide pair same mag (AC) but there's a close pair to the B star (BC) one of them, near equal ~3" (not physical!)
STF2191 AB 7m8 8m5 26.4'' 267° 2018 Oph 17h39m47.28s -04°58'04.80"
Uwe Pilz
Leipzig (Germany)
16x70 schwierig aber sehenswert ../projects/double-stars/uwe-pilz/sketches/200725_STF2191.jpg
Mark McCarthy
Fremont (California/USA)
203mm (667x) Wide separation near equal (AB seen. BC is Ho 419 12.71 7.6" not seen)
★★ STF2241, psi 1 Dra, 31 Dra AB 4m6 5m6 29.6'' 14° 2019 Dra 17h41m56.36s +72°08'55.80"
Christopher Hay
Seeheim (Germany)
15x45 Stabilised binoculars, handheld. Easily split. A appears pearl white, B brick red. A very fine pair for 15x. Resolved in stabilised 10x42 but not so pleasantly. Psi1 Dra is a physical double with a period of roughly 10,000 years.
René Merting
Drachhausen (Germany)
16x70 ein auffälliges Pärchen in einem wilden Sterngewimmel vieler heller Sterne, beide Komponenten sind knapp getrennt zu erkennen - Komponente B ist mindestens eine Größenklasse schwächer und strahlt nicht so schön reinweiß wie A
Christopher Hay
Seeheim (Germany)
80mm (30x) Widely split. A light yellow, B light blue.
Uwe Pilz
Leipzig (Germany)
105mm (55x) weiß-orange
★★★ COU1596 9m3 9m3 0.2'' 104° 2007 Her 17h42m14.40s +44°22'59.10"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Olive to notched at best moments, equal stars
★★★ STF2202, 61 Oph AB 6m1 6m5 20.8'' 93° 2019 Oph 17h44m34.09s +02°34'45.90"
René Merting
Drachhausen (Germany)
10x50 ein ausgesprochen schönes knapp getrenntes Sternpaar - beide Sterne sind in etwas gleich hell - Komponente B im Osten ist nicht ganz so weiß wie A
René Merting
Drachhausen (Germany)
16x70 ein schön eng stehendes Pärchen, knapp getrennt - Komponente A im Westen ist nur leicht heller als B - beide Komponenten wirken weiß
Uwe Pilz
Leipzig (Germany)
16x70 beide gelb ../projects/double-stars/uwe-pilz/sketches/200725_61Oph.jpg
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x leicht zu trennen - Komponente B im Osten ist nur minimal schwächer (keine halbe Größenklasse, denke ich) - Komponente A stahlt ein wenig wärmer als B
Sarah Gebauer
Germany
150mm (30x) bei geringer Vergrößerung (30x) schon sauber getrennt, beide Sterne wirken gleich groß und gleich hell, ein nettes Pärchen
Sarah Gebauer
Germany
150mm (54x) zwei nicht ganz enge Glanzpünktchen in einer eher uninteressanten Umgebung
Mark McCarthy
Fremont (California/USA)
203mm (667x) Half delta mag wide separation white.
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/61%20Ophiuchi.png
★★★ HU1288 8m3 9m4 0.4'' 163° 2016 Her 17h47m09.16s +15°02'13.80"

../images/binary-star-orbits/HU1288-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Awesome! clean split, very clean star images. Split by half disk, half delta mag. very cool great catch! suspected at 667x, ramped up power to 1067x to split.
TDT519 11m8 11m9 1.0'' 221° 2015 Her 17h48m54.56s +16°33'10.70"
Mark McCarthy
Fremont (California/USA)
508mm (667x) Extremely fine pair, brightens and elongated with averted vision but it's better to let the seeing settle down the hazy refraction and can see points of stars.
FOX22 10m7 11m3 1.0'' 339° 2010 Her 17h50m41.55s +15°16'15.40"
Mark McCarthy
Fremont (California/USA)
508mm (667x) Half delta mag. actually appears well split, two tiny dots, resolved from haze with seeing. Very cool.
TDT536 10m4 10m8 1.1'' 61° 2015 Her 17h51m18.78s +17°23'08.70"
Mark McCarthy
Fremont (California/USA)
508mm (667x) Very fine pair, well split, 1 delta mag, yellow white stars. Very tight but a nice wide clean split. Resolves with seeing.
STT338 AB 7m2 7m4 0.9'' 168° 2018 Her 17h51m58.46s +15°19'34.90"

../images/binary-star-orbits/STT338-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt
Mark McCarthy
Fremont (California/USA)
317mm (553x) Just split, a pair of bright near equal orange stars.
Mark McCarthy
Fremont (California/USA)
508mm (667x) Yellow-white very clean split stars seem more equal than what the data says
★★★ S694 6m7 7m3 79.3'' 238° 2018 Oph 17h52m05.20s +01°06'40.30"
Uwe Pilz
Leipzig (Germany)
16x70 gelbweiß und blau; identisch WDS1752+0107 ../projects/double-stars/uwe-pilz/sketches/200725_S694.jpg
★★ BU130, 90 Her 5m3 8m8 1.6'' 110° 2009 Her 17h53m18.03s +40°00'28.60"
Robert Zebahl
Leipzig (Germany)
120mm (300x) Not split at 200x and 300x. I used a 120/600mm achromat.
Mark McCarthy
Fremont (California/USA)
317mm (553x) 90 Her. Need stillness, it coalesces from the diffraction to a light orange point at 553x (grey at 885x). No doubt about it, star, point light. For the first 10 minutes of observing seeing allowed me to glimpse it 1 of every 10 seconds. But after a while seeing was better and I could hold it pretty consistently in both magnifications. At 553x it's in the first ring, at 885x it's in the second.
Mark McCarthy
Fremont (California/USA)
317mm (885x) 90 Her. Definite snowman or bulge to the disk, very subtle, but no split, using an apodizing mask.
AC9 9m0 9m2 1.0'' 242° 2015 Her 17h54m08.02s +29°48'44.60"
Mark McCarthy
Fremont (California/USA)
203mm (205x) ! Wow, very fine near equal split, white stars
HU235 6m9 9m0 1.8'' 289° 2018 Her 17h57m05.08s +45°51'21.40"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very certain point sitting just outside the diffraction ring, brightens and sharpens with seeing. 2" 2-3 delta mag.
★★ HO424 8m4 10m7 1.4'' 204° 2015 Her 17h57m44.09s +28°15'12.80"
Mark McCarthy
Fremont (California/USA)
203mm (205x) ! Extraordinarily fine pair. Bright white A and very tight B which lies just outside A's first diffraction ring, ~1.5". Need foveal coaxing to bring out B, which is very much fainter
★★ STF2308 40/41 Dra AB 5m7 6m0 18.7'' 232° 2019 Dra 18h00m09.07s +80°00'13.70"
AC 5m7 8m3 225.3'' 129° 2017

../images/binary-star-orbits/STF2308-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
8x44 2020-06-27: The pair AB split, but very tight with components of equal brightness. In acute angle far apart the component C was also visible.
Christopher Hay
Seeheim (Germany)
15x45 AB: Clearly split, brighter component seems bluish. One of the finest doubles for 15x, hence my two-star rating. In 10x42 a difficult split at the limit.
René Merting
Drachhausen (Germany)
16x70 ein schön eng stehendes Pärchen, die Himmelsrichtungen erschließen sich mir hier leider nicht, aber die Komponenten sind beide ähnlich hell und weiß - schöner Anblick im Fernglas
Christopher Hay
Seeheim (Germany)
50mm (8x) AB: An elongated figure-8 very close to splitting
Christopher Hay
Seeheim (Germany)
80mm (30x) AB: Very clearly split, dominates the 2.5° FOV, with interesting sprinkling of fainter stars throughout the field.
Robert Zebahl
Leipzig (Germany)
102mm (28x) Very nice, slightly uneven pair. Components appeared yellowish-white. Beautiful surroundings. On the sketch the components A, B and C are visible. ../projects/double-stars/robert-zebahl/sketches/2019-06-30_40_41_dra.jpg
Uwe Pilz
Leipzig (Germany)
105mm (100x) AB: =40/41 Dra. Auffallend
Christopher Hay
Seeheim (Germany)
140mm (75x) AB: Wide apart, the pair absolutely dominates the field of view, with attractive sprinkling of fainter stars to the west. Very delicate colour contrast that was hard to grasp in 3-inch scope now becomes clear, component B (40 Dra) is bluish, component A (41 Dra) yellowish.
H6 2, 67 Oph AC 4m0 8m1 54.7'' 143° 2019 Oph 18h00m38.72s +02°55'53.70"
René Merting
Drachhausen (Germany)
10x50 ein einfacher Doppelstern - Komponente C steht mit gutem Abstand südöstlich von A - Komponente A ist gleißend weiß, C wirkt dagegen richtiggehend grau-braun
Christopher Hay
Seeheim (Germany)
15x45 AC: Stabilised binoculars, handheld. Components wide apart, almost too wide to appear as a double star. Secondary a fine speck of light beside the primary, which is >4mag brighter. According to Stelledoppie a true physical pair at a distance of 1230 light years. It is interesting to contemplate that at this distance in space the companion still looks so separate. “H“ in the catalogue name means that this double star is listed in the catalogue of W. Herschel. The 6 in the name means that it is a double star of the 6th Class [separation 1’ or larger] in Herschel’s system.
René Merting
Drachhausen (Germany)
16x70 auf den ersten Blick bin ich enttäuscht, weil ich nur einen hell strahlenden Stern erkennen kann - dann aber mit etwas Konzentration ist südöstlich von der Leuchtgranate ein ganz schwacher Begleiter zu erkennen - ein sehr ungleiches Paar mit geschätzt 4 Größenklassen Unterschied - Komponente C wirkt rotbraun und steht ordentlich getrennt von A
Uwe Pilz
Leipzig (Germany)
16x70 der helle ist gelb-weiß ../projects/double-stars/uwe-pilz/sketches/200725_67Oph.jpg
Christopher Hay
Seeheim (Germany)
25x80 Very far apart, almost so far as to appear to not belong together. However, in the 3° field of view 70 Ophiuchi, which is also a physical double, is seen to be also split. Thus a very attractive field overall.
67 Oph and 70 Oph are the left and right nostrils of the bull in the old constellation Taurus Poniatowski (Poniatowski’s Bull). 68 Oph (the tip of the bull’s nose) and 73 Oph (the bull’s right eye) are also double stars, but can’t be split at 25x. All four doubles – 67, 68, 70 and 73 Oph – are physical, a rare assemblage!
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x großer Abstand zwischen beiden Sternen - weil Komponente A so gleißend hell strahlt, fehlt der mindestens um 3 Größenklassen schwächeren Komponente C im SO die Farbe, eher gräulich
BU1127 AB 7m3 9m2 0.7'' 39° 2018 Her 18h02m30.89s +44°14'02.60"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very tough but a small point of a star resolved at the rim of the diffraction ring at both 553x & 885x, using kind of a partial averted vision.
STT341 AB 7m4 8m8 0.1'' 86° 2019 Her 18h05m49.72s +21°26'45.60"
AB-C 7m2 10m6 28.2'' 171° 2015
AB-D 7m2 10m5 39.5'' 99° 2009
AB-E 7m2 10m2 66.5'' 38° 2018
AB-F 7m2 11m5 111.6'' 357° 2009
AB-G 7m2 7m6 132.5'' 239° 2018

../images/binary-star-orbits/STT341-AB-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (32x) AB-C: bei 32x ist Komponente C weit getrennt südlich von AB als Hauch von einem Stern erkennbar
AB-D: bei 32x ist Komponente D im Osten von AB ist ähnlich schwach erkennbar wie C im Süden - D ist etwas weiter weg als C
AB-E: bei 32x ist Komponente E im NO von AB ähnlich schwach erkennbar wie C im Süden und D im Osten - Entfernung zu A doppelt so weit wie AB-C
AB-F: bei 64x ist F im Norden von AB in vierfacher Entfernung AB-C erkennbar - im Grunde spiralen die vier schwachen Komponenten von Süden kommend von Osten nach Norden aus
AC15, 99 Her AB 5m1 9m0 1.4'' 331° 2018 Her 18h07m01.61s +30°33'42.70"

../images/binary-star-orbits/AC15-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (667x) 99 Her.Very nice. B star resolves just outside first diffraction ring when that ring has faded with good seeing, a very fine faint point. large delta mag. There are many other pairings in this system, including 0.2" for the A star]
Mark McCarthy
Fremont (California/USA)
317mm (553x) 99 Her: ! Bright yellow star, suspected double at 277x but needed 553x to resolve a 9th mag orange B when seeing stilled, resolved as a point just outside where the diffraction ring was. CDSA notes: "Local, solar type binary, faint field. AB system 1.8 solar mass, p=56 y orbit r = 17 AU, e = 0.77, apastron 2025"
★★ STF2280, 100 Her AB 5m8 5m8 14.3'' 183° 2019 Her 18h07m49.56s +26°06'04.40"
René Merting
Drachhausen (Germany)
10x50 zwei extrem dicht stehende helle Sterne - noch nicht getrennt, aber schön als 8 erkennbar
Robert Zebahl
Leipzig (Germany)
16x70 2020-07-05: Very nice, rather isolated double star. Striking. Similar bright component, both white.
René Merting
Drachhausen (Germany)
18x70 perfekt für 18-fache Vergrößerung - zwei gleich helle, dicht zusammen stehende Sterne - reinweiß und sehr auffällig, weil keine ähnlich hellen Sterne im Umfeld zu sehen sind
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein schönes, enges Pärchen zweier gleichheller Sterne - beide gleich hell und reinweiß - zurück auf 20x zeigen sich beide Protagonisten weiterhin ganz knapp getrennt - Komponente B im Süden wirkt leicht gelblich und schwächer
Uwe Pilz
Leipzig (Germany)
105mm (26x) Weiß-orangeweiß
Robert Zebahl
Leipzig (Germany)
120mm (40x) Conditions in the target region: SQM-L 20.5
Very nice, evident double star with equally bright components.
Karsten Kopp
Köln (Germany)
140mm (94x) Doppelstern ist einfach zu trennen. Das besondere ist hier, dass die beiden Sterne recht alleine zu stehen scheinen. Beide erscheinen weiß.
Sarah Gebauer
Germany
150mm (54x) zwei hübsche Glanzpünktchen, die mich an ein Knöpflein mit zwei Löchern erinnern, der "typische" DS für mich: nicht zu eng, nicht zu weit, gleich hell, sehr nett ../projects/double-stars/sarah-gebauer/sketches/20200805%20100%20Her%20DSk.jpg
Robert Zebahl
Leipzig (Germany)
152mm (22x) Beautiful view. Easy to separate with components of the same brightness. It is noticeable that there are no brighter stars in the immediate vicinity, so that the double star stands out very well.
Mark McCarthy
Fremont (California/USA)
203mm (205x) 100 Her. Bright equal wide yellow-white stars. [not physical]
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/100%20Herculis.png
★★ HU674 7m7 8m6 0.7'' 214° 2018 Her 18h09m40.64s +50°24'07.40"

../images/binary-star-orbits/HU674-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt, ähnlich hell ../projects/double-stars/frederik-wanink/sketches/HU674.jpg
Mark McCarthy
Fremont (California/USA)
508mm (333x) Split with seeing at 333x, near equal white.
mu Sgr, Polis H5 7 AB 3m9 10m5 16.9'' 258° 2013 Sgr 18h13m45.81s -21°03'31.80"
BU292 AC 3m9 12m8 25.5'' 119° 2008
HJ2822 AD 3m9 10m0 48.2'' 312° 2013
HJ2822 AE 3m9 9m2 50.2'' 114° 2013
SLV7 BD 10m5 10m0 40.9'' 331° 1998
SLV7 BE 10m5 9m2 64.6'' 106° 2015
René Merting
Drachhausen (Germany)
100mm (32x) AD: bei 32x Komponente A gleißend hell im Zentrum und Komponente D gut abgesetzt sehr schwach im NW
AE: bei 32x auf der entgegengesetzten Seite im SW zeigt sich Komponente E in gleichem Abstand und mit gleicher Lichtschwäche - die beiden schwachen Komponenten D und E haben A voll in der Flügelzange - das Ganze funktioniert auch bei 20x, aber das sind die beiden schwachen Komponenten nahe der Sichtbarkeitsgrenze
BU1274 BC 9m8 10m6 1.0'' 144° 2017 Dra 18h14m31.41s +56°34'26.90"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Super challenging. A-BC is bright white A and BC is blue widely separated. Near to BC is BD, which is near equal to BC and ~6". BC is faint and split with seeing, hairline, significant mag difference
ES1651, TZ Lyr 11m2 12m4 2.5'' 2015 Lyr 18h15m49.67s +41°06'37.80"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Challenging! Faint elongated star with direct vision. With averted vision it flashes a split, half delta mag, just split.
★★★ BU641 7m0 8m7 0.8'' 341° 2015 Her 18h21m48.44s +21°30'27.90"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) sehr schwierig ../projects/double-stars/frederik-wanink/sketches/BU641.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Extraordinary! Moderately bright A and very much fainter B, 4-5 delta mag, <1" separation. Seeing needs to still.
Mark McCarthy
Fremont (California/USA)
508mm (533x) V989 Her. Seen as a snowman dot to bright white A @ 333x, split with 533x, inside first diffraction ring. Need A's disk to be perfectly tight for B to resolve with seeing. Very nice. 1" at discovery 1878 with Dearborn 18.5-inch
HU581 8m8 9m4 0.4'' 122° 2016 Her 18h22m54.84s +14°58'11.00"

../images/binary-star-orbits/HU581-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Snowman at 533x & 667x, clean split at 1067x & apodising mask, one delta mag. Amazing. Coalesces into two points, can easily tell orientation & magnitude difference for sketch. At apastron, it is on a nearly edge on orientation, will close rapidly within the next ten years to be too close for me to detect.
STF2323, 39 Dra AC 5m1 8m0 88.9'' 20° 2017 Dra 18h23m54.65s +58°48'02.10"
AB 5m1 8m1 3.8'' 348° 2018

../images/binary-star-orbits/STF2323-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
55mm (27x) AC: Pretty wide, unequal pair. Die brighter A component appeared white.
Robert Zebahl
Leipzig (Germany)
55mm (71x) AB: Very nice. The B component seemed to be comparable faint as the C component. ../projects/double-stars/robert-zebahl/sketches/2019-05-18_39_dra.jpg
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: 39 Dra. Brilliant white A and slightly ruddy B, ~3 delta mag, ~4" sep. 3962.5 year period.
STF2315 AB 6m6 7m8 0.6'' 117° 2018 Her 18h24m58.46s +27°23'41.30"

../images/binary-star-orbits/STF2315-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) als 8 zu sehen ../projects/double-stars/frederik-wanink/sketches/STF2315.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) ! Hairline split @ 553x near equal mag. Suspected elongation at 277x.
Mark McCarthy
Fremont (California/USA)
508mm (533x) Barely split with seeing, resolves to two disks, more than hairline but almost 2 delta mag, very tough, need perfect seeing. 2094 year period
TDT886 11m0 11m3 0.5'' 24° 1991 Her 18h27m27.80s +24°17'10.40"
Mark McCarthy
Fremont (California/USA)
508mm (667x) Extremely fine. At first it seems not split, but in best moments B stretches out and pops out from B, 0.5" and 1 delta mag.
STF2320 7m1 8m9 0.9'' 2015 Her 18h27m45.89s +24°41'50.80"
Mark McCarthy
Fremont (California/USA)
203mm (667x) V994 Her. Seen with the 20", but used the 8" mask to clean up the images. Two delta mag, ~1" very nice pair. [eclipsing binary of Algol type--surely not seeing the eclipsing star? In fact, both A & B each are eclipsing binaries, the first such system to be discovered in the whole sky!]
Frederik Wanink
Itterbeck (Germany)
254mm (640x) ../projects/double-stars/frederik-wanink/sketches/STF2320.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Nice! Blue-white stars, 1", 2 delta mag.
STF2337 AB 8m1 9m1 16.6'' 297° 2018 Sct 18h34m55.15s -14°42'10.60"
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x gut trennbar, Helligkeitsunterschied zwischen A und B gut eine halbe Magnitude - bei 32x noch einfacher, und Verstärkung des schönen Farbkontrastes, Komponente A im SO ist weiß-bläulich und Komponente B zinnober-rot
★★ STT359 6m3 6m6 0.7'' 2019 Her 18h35m30.40s +23°36'19.90"

../images/binary-star-orbits/STT359-orbit.jpg

Robert Zebahl
Leipzig (Germany)
102mm (160x) 2020-11-10: Clearly elongated with slight notching and little difference in brightness. I estimated the position angle to 0°.
Uwe Pilz
Leipzig (Germany)
105mm (198x) leicht eingekerbt, Abstand 0“75 ../projects/double-stars/uwe-pilz/sketches/stt359.jpg
Mark McCarthy
Fremont (California/USA)
203mm (667x) Kissing 8" 333x, hairline split 667x. Near equal white A and bluish white B.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STT359.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Nice! ~0.8" equal yellow-orange stars.
Uwe Pilz
Leipzig (Germany)
320mm (388x) ein sehr ruhiger Abend gestattete die Nutzung von 12 Zoll ../projects/double-stars/uwe-pilz/sketches/200808stt359.jpg
Mark McCarthy
Fremont (California/USA)
508mm (333x) Light yellow near equal split, very close. 219 year period
★★ STT358 AB 6m9 7m1 1.7'' 146° 2019 Her 18h35m53.22s +16°58'32.50"

../images/binary-star-orbits/STT358-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (110x) fast gleich hell, deutlich trennbar
Mark McCarthy
Fremont (California/USA)
203mm (333x) Pretty, near equal white, perfect disks.
Mark McCarthy
Fremont (California/USA)
508mm (205x) Yellow-white stars, half delta mag, well split. 380 year period
STF2351 7m6 7m6 5.0'' 161° 2019 Lyr 18h36m12.00s +41°16'41.20"
Robert Zebahl
Leipzig (Germany)
70mm (57x) Beautiful, little double star with equally bright components at a moderate distance.
René Merting
Drachhausen (Germany)
100mm (64x) bei 32x sind zwei Sterne zu erkennen, die sich noch berühren - bei 64x zeigt sich dann nein knapp getrenntes Pärchen - fast kein Helligkeitsunterschied, ich habe Komponente A für die schwächere der beiden in etwas gleich hellen Sterne gehalten - Komponente B ist warm-weiß
Mark McCarthy
Fremont (California/USA)
317mm (553x) Bright yellow-orange equal pair, wide.
★★ alpha Lyr, 3 Lyr, Vega H5 39 AB 0m1 9m5 83.7'' 184° 2017 Lyr 18h36m56.33s +38°47'01.20"
STFB9 AC 0m1 11m0 76.0'' 255° 2012
STFB9 AE 0m1 9m5 86.6'' 39° 2017
Jörg S. Schlimmer
Germany
127mm (203x) um Vega mehrere Beugungsringe sowie Speckles sichtbar, B leicht zu sehen, E nicht sichtbar ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Vega_20190626_ausschnitt_filtered.jpg
Jörg S. Schlimmer
Germany
127mm (203x) verschiedene Vergrößerungen zwischen 40 und 203 fach, Komponente E zeitweise bei indirektem Sehen sichtbar, da Himmel heute klarer ist ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Vega_20190627_ausschnitt_filtered.jpg
★★ STF2358 9m8 10m2 2.5'' 224° 2015 Lyr 18h38m35.04s +30°43'20.10"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Faint near equal <2", another brighter / wider pair nearby. Nice!
HU325 10m2 10m8 0.3'' 2008 Her 18h44m18.57s +20°52'17.80"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Hairline split, ~1 delta mag, very fine pair
★★★ epsilon Lyr STFA37 AB-CD 4m7 4m6 209.5'' 172° 2016 Lyr 18h44m20.34s +39°40'12.40"
STFA37 AI 5m2 10m1 149.5'' 137° 2015
STF2382, 4 Lyr, epsilon 1 Lyr AB 5m2 6m1 2.2'' 345° 2019
STF2383, 5 Lyr, epsilon 2 Lyr CD 5m2 5m4 2.4'' 74° 2019

../images/binary-star-orbits/STF2382-AB-orbit-solution-1.jpg ../images/binary-star-orbits/STF2382-AB-orbit-solution-2.jpg ../images/binary-star-orbits/STF2383-CD-orbit.jpg

Christopher Hay
Seeheim (Germany)
naked eye While waiting for Comet Neowise at 3 in the morning in July 2020 surprised myself with my first naked-eye separation of Alpha1 und Alpha2 Capricornis (observing site at 50° northern latitude, Alpha1/2 passing through meridian). Encouraged by this, I lay down and had a close look at Epsilon Lyrae, without really expecting to be able to split it naked-eye, having never succeeded previously. At first Epsilon Lyrae appeared as a very short dash of light. Then the dash resolved into two pinpoints. After 15 years in the hobby and at age 60, at last got Eps Lyr split! No precise prior PA knowledge. After memorising PA as seen naked-eye carefully, confirmed it with binoculars. Eps Lyr is the third-easiest physical double in the (northern hemisphere) summer sky for the naked eye, after Zeta UMa (much easier) und Alpha Lib (marginally easier).
Christopher Hay
Seeheim (Germany)
2x54 AB-CD: Clean split. Actually more pleasant than in 4x10 binoculars, presumably due to more steady handheld view.
Robert Zebahl
Leipzig (Germany)
55mm (59x) STF2382 (AB): At 42x slightly elongated, at 59x elongated and obviously notched.
Robert Zebahl
Leipzig (Germany)
55mm (59x) STF2383 (CD): At 42x clearly elongated, but without any visible notch. At 59x split with touching diffraction disks.
Robert Zebahl
Leipzig (Germany)
70mm (57x) STF2382 (AB): Obviously seen as figure '8'.
Robert Zebahl
Leipzig (Germany)
70mm (57x) STF2383 (CD): Split, but extremely tight with almost touching diffraction disks.
René Merting
Drachhausen (Germany)
76mm (95x) AB-CD: bei 29x schön getrennt erkennbar, ohne dass sich AB und CD schon trennen lassen
AB: bei 57x leicht länglich mit kleiner Einschnürung - bei 95x schön eng getrennt, B nördlich wirkt etwas schwächer- bei 127x wunderschön, das Sternpaar hat zwei Beugungsscheibchen, die wie ein Heiligenschein um die beiden Sterne stehen
CD: bei 57x eine 8 - bei 95x ein schön eng getrenntes Pärchen gleichheller Sterne - bei 127x wunderschön, das Sternpaar hat zwei Beugungsscheibchen, die wie ein Heiligenschein um die beiden Sterne stehen
EF und I: bei 127x sind alle drei Sterne (I 10.1 mag / E 12.3 mag / F 12.7 mag) erkennbar
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 64x ist das Sternpaar mit leichter Einschnürung und Nord-Süd-Ausdehnung erkennbar - beide Sterne stehen minimal enger zusammen als das südlichere Paar CD - bei 107x knappe Trennung, Komponente B nördlich ist mindestens eine halbe Größenklasse schwächer als A
CD: bei 64x als 8 mit Ost-West-Ausdehnung erkennbar - bei 107x knapp getrennt, beide Komponenten sind etwa gleich hell
Sarah Gebauer
Germany
100mm (136x) ein Test mit dem neuen Refraktor, um einen Vergleich zum 6''-Newton zu ziehen: bei 136x schon astrein getrennt, natürlich ziemlich eng und ganz fein getrennt, aber dennoch ein überraschend positives Ergebnis
Robert Zebahl
Leipzig (Germany)
102mm (125x) Stunning view of the components A-D and I! ../projects/double-stars/robert-zebahl/sketches/2019-06-26_epsilon_lyr.jpg
Uwe Pilz
Leipzig (Germany)
105mm (26x) bei 22x nicht trennbar ../projects/double-stars/uwe-pilz/sketches/epsLyr2.jpg
Jörg S. Schlimmer
Germany
127mm (203x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Epsilon-Lyrae_ausschnitt_filtered.jpg
Sarah Gebauer
Germany
150mm (250x) August 2019 zum ersten Mal die nah beieinanderstehenden Komponenten sauber getrennt, ein grandioser Doppel-Doppel-Anblick
René Merting
Drachhausen (Germany)
320mm (144x) bei 144x sind die Komponenten von AB und CD gerade so getrennt voneinander erkennbar, sie tanzen wie wild miteinander - mit Arperturmaske und Abblendung auf 120 mm zeigen die vier nun deutlich schwächeren Sterne schöne Beugungsscheibchen und sind besser getrennt voneinander sichtbar
Uwe Pilz
Leipzig (Germany)
320mm (200x) 7 Komponenten!! A-B-C-D-E-F-I ../projects/double-stars/uwe-pilz/sketches/epsLyr.jpg
Berthold Fuchs
Wiesbaden (Germany)
130mm Double-Double ../projects/double-stars/berthold-fuchs/photographs/epsilon%20Lyrae.png
STFA38, zeta Lyr, zeta 1/2 Lyr AD 4m3 5m6 43.7'' 150° 2018 Lyr 18h44m46.36s +37°36'18.40"
Christopher Hay
Seeheim (Germany)
10x42 Clearly separated. Colour contrast between bluish A and orangish D is there if one knows it, but not as striking as in 15x45 binoculars.
Christopher Hay
Seeheim (Germany)
15x45 Component A clear blue-white, component D very pale tangerine orange. Wide split. Colour contrast seems even greater than that of nearby Delta 1/2 Lyrae. Physical double.
René Merting
Drachhausen (Germany)
76mm (29x) bei 29x ein schön getrenntes Pärchen - D im Südosten ist 1.5 Magnituden schwächer und wirkt blaugrau gegen die weißgelbe A-Komponente
Mark McCarthy
Fremont (California/USA)
80mm (13x) Zeta 2 Lyr. Slightly greenish-white stars. Best view in finder, cleaner. Wide, 1 delta mag.
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x weit getrennt, Komponente A weißlich, D leicht gelblich
Uwe Pilz
Leipzig (Germany)
105mm (88x) weiß-orange ../projects/double-stars/uwe-pilz/sketches/zetaLyr.jpg
Sarah Gebauer
Germany
150mm (85x) weit getrennt, unspektakulär
Mark McCarthy
Fremont (California/USA)
152mm (175x) Wide, white-yellow stars, one delta
STF2393 AB 7m8 10m4 18.2'' 24° 2015 Lyr 18h45m10.84s +38°18'54.60"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty light orange and light blue! Wide separation, 1.5 delta mag.
STF2375 AB 6m3 6m7 2.6'' 120° 2019 Ser 18h45m28.36s +05°30'00.40"
René Merting
Drachhausen (Germany)
100mm (64x) bei 64x sehe ich zwei sehr dicht stehende Sterne, mit etwas Geduld wird ab und an eine knappe Trennung deutlich - beide sind in gleich hell (ich habe sogar A und B falsch zugeordnet, weil ich B knapp heller fand) und strahlen um die Wette in weiß
Stefan Loibl
Rosenheim (Germany)
102mm (102x) 'Tweedledum' and 'Tweedledee', recognizable as double star at 68x, clearly split at 102x, components equally bright, quadruple, visual double
STF2390 7m4 8m6 4.3'' 155° 2016 Lyr 18h45m49.83s +34°31'06.60"
René Merting
Drachhausen (Germany)
100mm (64x) bei 64x ploppt Komponente B knapp getrennt auf, vorher war sie unsichtbar - Farben Fehlanzeige
Uwe Pilz
Leipzig (Germany)
105mm (88x) ../projects/double-stars/uwe-pilz/sketches/191031STF2390.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Orange and very wide separation B, 2x fainter B, bluish.
COU1154 11m1 11m0 0.6'' 55° 2010 Lyr 18h47m38.65s +32°47'28.90"
Mark McCarthy
Fremont (California/USA)
508mm (667x) Suspect notch at 553x, 1067x too hazy, but great clean split at 667x, very small, near equal. What a great sight.
★★ STF2406 7m1 11m2 4.6'' 2018 Lyr 18h49m55.77s +26°25'30.60"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Bright white, 3-4 delta mag, B is averted vision only and delicate, with seeing. Wow!
Mark McCarthy
Fremont (California/USA)
508mm (667x) White star no split at 8" 333x and 667x, but needed the 20" to see the well separated B star.
A256 9m0 11m2 2.9'' 59° 2009 Lyr 18h50m03.54s +31°48'48.20"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Orange pair, about 2 delta mag, wide 4-5". Nice pair.
★★ beta Lyr, 10 Lyr, Sheliak STFA39 AB 3m6 6m7 45.7'' 149° 2017 Lyr 18h50m04.79s +33°21'45.60"
BU293 AE 3m6 10m1 67.2'' 317° 2015
BU293 AF 3m6 10m6 86.0'' 18° 2015
Christopher Hay
Seeheim (Germany)
10x42 AB: Stabilised binoculars, handheld. B is well apart from A and distinct. Very pretty!
Robert Zebahl
Leipzig (Germany)
70mm (22x) At 22x and 57x the components A, B, E and F were easily seen. The B component appeared slightly bluish-silver at 22x, but at 57x the color was difficult to tell. All four components form a slightly curved 'Y' with the bright A component in the center.
René Merting
Drachhausen (Germany)
76mm (18x) AB: bei 18x sind die beiden Sterne gut getrennt voneinander zu erkennen
EF: beide Komponenten zeigen sich bei 18x sehr schwach
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x sind die Komponenten A und B weit getrennt, B ist deutlich schwächer
EF: ebenfalls bei 32x machen zwei gleichhelle Fühlersterne (E und F) nördlich von Komponente A das System interessanter - sie sind noch schwächer als B - Farbe konnte ich bei keinem der vier Sterne erkennen
Robert Zebahl
Leipzig (Germany)
102mm (62x) Components A, B, E and F are easily visible. The two southern stars on the drawing do not belong to the system. ../projects/double-stars/robert-zebahl/sketches/2019-06-23_beta_lyr.jpg
Uwe Pilz
Leipzig (Germany)
105mm (139x) AB: Begleiter ist tiefrot; die Natur des Systems ist unsicher ../projects/double-stars/uwe-pilz/sketches/betaLyr.jpg
Uwe Pilz
Leipzig (Germany)
105mm (144x) schon sichtbar bei 26x, aber schwierig. A blauweiß, B orange. ../projects/double-stars/uwe-pilz/sketches/191031betaLyr.jpg
Jörg S. Schlimmer
Germany
127mm (108x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung-beta-Lyrae_filtered_96dpi.jpg
Sarah Gebauer
Germany
150mm (85x) AB: weit getrennt, viele helle Feldsterne
BU265 7m4 9m2 1.5'' 227° 2018 Aql 18h50m14.94s +11°31'21.50"
Mark McCarthy
Fremont (California/USA)
203mm (667x) Very tremulous B star appears with seeing, surprisingly difficult for the mag, maybe because so close.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very faint but resolved B at outer diffraction ring when seeing stills. Yellow A, bluish B.
STF2404 6m9 7m8 3.7'' 181° 2019 Aql 18h50m45.55s +10°58'35.20"
Robert Zebahl
Leipzig (Germany)
70mm (44x) Already at 22x the double star is striking due to its orange color. At 44x split, but rather tight with a clear difference in brightness. At 100x the primary component appears in a bright orange, the secondary component shows a bluish tint.
Mark McCarthy
Fremont (California/USA)
203mm (667x) Light orange and light blue, pretty.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) beide gelblich ../projects/double-stars/frederik-wanink/sketches/STF2404.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) well split, yellow A and yellow-orange B.
RST4605 11m2 11m6 0.9'' 141° 1995 Aql 18h50m58.96s -02°38'02.20"
Mark McCarthy
Fremont (California/USA)
508mm (667x) Very, very fine, faint, split, quarter delta mag. Very tough considering proximity to nearly full moon with poor transparency. Nice!
HU199 9m1 9m5 0.9'' 345° 2015 Aql 18h52m07.48s +11°47'54.30"
Mark McCarthy
Fremont (California/USA)
203mm (667x) Wow! With seeing very tight very faint but split near equal. very cool.
BU137 AB 8m7 9m0 1.5'' 169° 2015 Lyr 18h53m57.56s +37°22'49.70"

../images/binary-star-orbits/BU137-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) ../projects/double-stars/frederik-wanink/sketches/BU137.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Fine near equal light orange, ~2". Rich finder field. In Steph 1 open cluster.
Mark McCarthy
Fremont (California/USA)
508mm (667x) Nice bright white near equal stars, 1.5", in a two plus one system with much fainter farther C. (AC 12th mag 23.6")
HU1294 9m6 10m6 1.6'' 118° 2014 Lyr 18h54m14.83s +32°14'12.70"
Mark McCarthy
Fremont (California/USA)
508mm (667x) Well split, 1.5 delta mag, 2" sep, light orange and blue stars. pretty.
delta 2 Lyr, 12 Lyr, delta Lyrae Cluster, Stephenson 1 ES2028 AB 4m3 11m2 86.3'' 349° 2014 Lyr 18h54m30.29s +36°53'55.00"
ES2028 BC 11m2 11m6 2.1'' 135° 2008
SMR13 AD 4m5 8m8 193.1'' 210° 2014
SMR13 AE 4m5 10m3 400.6'' 238° 2014
SMR13 AF 4m5 8m8 369.4'' 245° 2014
SMR13 AG 4m5 9m8 335.9'' 261° 2014
SMR13 AH 4m5 8m7 229.4'' 284° 2014
SMR13 AJ 4m3 12m0 279.5'' 249° 2014
SMR13 AK 4m3 12m0 304.2'' 236° 2014
SMR13 HI 8m7 12m9 26.1'' 251° 2015
Jörg S. Schlimmer
Germany
305mm (94x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung-delta-Lyrae_filtered_96dpi.jpg
Mark McCarthy
Fremont (California/USA)
508mm (205x) ES2028 (BC): Delta 2 Lyr. ! Very cool. A is bright light orange, and BC are blue pinpoints, ~2" with a slight mag difference. Clearly and cleanly seen.
HO270 AB 5m4 12m6 8.4'' 300° 2013 Lyr 18h54m52.18s +41°36'09.80"
Mark McCarthy
Fremont (California/USA)
508mm (205x) ! Bright yellow A and very faint B seen with averted vision then held direct, with another faint star one ninety degrees different PA and three times farter out (this is AC). There is a streak of grainy stars across the field, very rich.
★★ STT525 & SHJ282 STT525 AB 6m1 9m1 1.8'' 130° 2015 Lyr 18h54m52.52s +33°58'06.90"
SHJ282 AC 6m1 7m6 45.4'' 350° 2018
SHJ282 AD 6m1 11m0 214.8'' 295° 2015
Christopher Hay
Seeheim (Germany)
10x42 SHJ282 (AC): Stabilised binoculars, handheld. Wide split, the A component yellowish. Alias South 282. According to Stelledoppie a physical double.
Robert Zebahl
Leipzig (Germany)
16x70 SHJ282 (AC): 2020-07-06: Easy, striking with reasonably apparent color contrast: yellowish to slightly orange & bluish.
Christopher Hay
Seeheim (Germany)
60mm (15x) SHJ282 (AC): Wide split. Blue colour of C component much more striking than the orange colour of the A component.
Robert Zebahl
Leipzig (Germany)
70mm (22x) SHJ282 (AC): Fairly bright and wide pair. The double star was conspicuous, especially in regard to its color: A appeared orange, C rather grey-bluish. It could be observed together with Messier 57 and beta & gamma Lyrae. Very nice.
René Merting
Drachhausen (Germany)
76mm (18x) SHJ282 (AC): bei 18x ist das Pärchen schon sehr auffällig - A ist hellgelb mit schönem Kontrast zur nördlich stehenden, gut getrennten B-Komponente - bei 57x präsentiert sich B in einem zarten stahlblau
Uwe Pilz
Leipzig (Germany)
105mm (21x) SHJ282 (AC): Orange und türkis ../projects/double-stars/uwe-pilz/sketches/191031SHJ282.jpg
Uwe Pilz
Leipzig (Germany)
105mm (180x) STT525 (AB): gelbweiß-blau
Christopher Hay
Seeheim (Germany)
125mm (23x) SHJ282 (AC): Widely split, dominates the field of view, very attractive. A component is tangerine orange, C component ice blue. An echo of Albireo. A true physical pair.
Christopher Hay
Seeheim (Germany)
180mm (200x) SHJ282 (AC): A is very distant from C but the two are still a fine pair. Colour of C is more striking than that of A, in a manner similar to my simultaneous observation with 60mm at 15x, but not quite as pronounced.
C has a companion set off from it by a hair of black. I estimate PA from C at approx. 80°, separation very roughly 2". Surprisingly can't find this companion in the double star catalogues.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) STT525 (AB): 3er System, sehr schwierig wegen Helligkeitsunterschied ../projects/double-stars/frederik-wanink/sketches/STT525.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) SHJ282 (AC): Wide separation orange and blue, 2 delta mag.
Claus-Dieter Jahn
Leipzig (Germany)
SHJ282 (AC): TS APQ 65/420mm, ZWO ASI 178mc, Livestack with Sharpcap, Exposure time: 1600x 0.6s ../projects/double-stars/claus-dieter-jahn/photographs/2020-04-07_shj282.jpg
COU511 Aa-Ab 9m7 9m9 0.7'' 190° 2016 Her 18h55m23.68s +23°24'00.10"
Mark McCarthy
Fremont (California/USA)
508mm (533x) ! Wow great pair. A star rather bright with B very close-in, ~1 delta mag, the tiniest pin prick <1" separated from A
A2193 8m8 9m2 1.0'' 357° 2017 Ser 18h55m51.23s +03°22'30.80"
Mark McCarthy
Fremont (California/USA)
203mm (667x) Pair of white stars, half delta mag. found very quickly slew to. Nice pair. Very clean split.
STF3130 & STT365 STT365 AB 7m2 8m3 0.2'' 359° 2016 Lyr 18h55m57.14s +44°13'41.90"
STF3130 AB-C 7m0 10m5 2.6'' 257° 2016
STF3130 AB-D 7m0 12m0 181.2'' 310° 2003
Mark McCarthy
Fremont (California/USA)
152mm (175x) STF3130 (AB-C): Very fine, B very much fainter and red color. B appears with seeing, very close (AB is 0.4" and doable with 20-inch)
Mark McCarthy
Fremont (California/USA)
317mm (553x) STF3130 (AB-C): Extremely faint but present direct vision, white A and blue B, 4" 3-4 delta mag. Did not see AB 0.4". Nearby R Lyr which is a pretty orange.
Mark McCarthy
Fremont (California/USA)
317mm (553x) STT365 (AB): Very fine, white and blue stars, ~4", 3 delta mag. Nice!
Mark McCarthy
Fremont (California/USA)
508mm (205x) STF3130 (AB-C): Very nice bright white A and slightly red B well split from A, three delta mag. Did not notice the 0.4" AB pair STT 365
STF2417, theta Ser, 63 Ser, Alya AB 4m6 4m9 22.4'' 106° 2019 Ser 18h56m13.18s +04°12'12.90"
AC 4m6 6m8 421.0'' 58° 2007
René Merting
Drachhausen (Germany)
10x50 AB: zwei helle schneeweiße Sterne, knapp getrennt - B im Osten ist nur knapp schwächer - ein schönes enges Pärchen
René Merting
Drachhausen (Germany)
16x70 AB: ein gut getrennt zu sehendes Pärchen - beide Sterne stahlen weiß, Komponente B im Osten ist keine halbe Größenklasse schwächer
René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 20x ein auffälliges gut getrenntes Sternpaar - Komponente B östlich ist nur leicht schwächer und strahlt ein wenig warm-weißer
Sarah Gebauer
Germany
100mm (73x) AB: die mit deutlichem Abstand bei 73x getrennten Doppelsterne liegen wie in einem U aus recht gleich hellen Sternen und bilden dabei im Süden den unteren Bereich des Buchstabens ../projects/double-stars/sarah-gebauer/sketches/STF%202417.jpg
Stefan Loibl
Rosenheim (Germany)
102mm (102x) AB: wide pair, hardly any difference in brightness, wonderful field, double stars looks like an embedded pair of eyes
Berthold Fuchs
Wiesbaden (Germany)
130mm AB: easy DS ../projects/double-stars/berthold-fuchs/photographs/theta%20Ser.png
★★ STF2422 7m9 8m2 0.8'' 68° 2018 Her 18h57m07.83s +26°05'45.10"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Excellent hairline split at 333x with eight inch. Near equal white stars. Picked them out in a crowded field, suspected elongation right away, split with seeing as I centered it in eyepiece, and from then it was a steady split
Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwieriger wegen schwacher Sterne ../projects/double-stars/frederik-wanink/sketches/STF2422.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very tight, <0.8", equal light orange, pretty faint.
A587 BC 10m6 11m5 1.8'' 188° 2017 Lyr 18h57m55.98s +44°07'00.00"
Mark McCarthy
Fremont (California/USA)
508mm (205x) Excellent 2+1 pair, bright A, BC wide and 1 delta mag, well split ~2"
COU1156 11m1 11m2 0.7'' 111° 2016 Lyr 19h00m34.25s +33°01'24.80"
Mark McCarthy
Fremont (California/USA)
508mm (667x) Near qual small and at best moments a clean split, still, just nice points. great star
HO92 10m6 10m8 1.3'' 40° 2015 Lyr 19h00m59.89s +32°33'11.60"
Mark McCarthy
Fremont (California/USA)
508mm (667x) Beautifully well split, had an instant of perfect images. White pair near equal.
STF2437 8m4 8m8 0.6'' 2019 Sge 19h01m53.16s +19°10'11.70"

../images/binary-star-orbits/STF2437-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Small faint, notched peanut when seeing stills. Orange.
A589 9m5 10m1 0.7'' 2017 Lyr 19h03m01.81s +42°32'45.80"
Mark McCarthy
Fremont (California/USA)
508mm (533x) ! Exceedingly fine pair, split with seeing, ~1 delta mag, white A and blue B. In the same field with ES 1430.
COU1935 10m6 11m1 1.1'' 41° 2015 Lyr 19h04m11.37s +38°58'47.40"
Mark McCarthy
Fremont (California/USA)
508mm (667x) Very fine near equal, well split, 1", white. Verified on chart.
★★ 15 Aql, SHJ286 5m5 7m0 39.6'' 211° 2019 Aql 19h04m57.67s -04°01'53.10"
René Merting
Drachhausen (Germany)
10x50 sehr auffälliges dicht zusammen stehendes Sternpaar - Komponente A im Norden ist hellgelb, B grau-orange, schöner Farbkontrast
René Merting
Drachhausen (Germany)
12x50 ein ordentlich getrenntes Sternpaar - A im NO ist weißgelb, B wirkt gelborange
René Merting
Drachhausen (Germany)
16x70 ein wunderschönes ordentlich getrenntes Sternpaar - Komponente A im NO samtgelb, B dagegen apricot-orange und gut 1.5 Magnituden schwächer als A - zudem ein interessanter Farbvergleich möglich zu dem mit im Gesichtsfeld stehenden V Aql gut 1.7° weiter südlich, der farblich noch eine Schippe drauf legen kann mit einem kräftigen zinnober-orange
Robert Zebahl
Leipzig (Germany)
70mm (22x) Striking, pretty wide, uneven pair. Primary component gleamed in shiny orange, the companion appeared slightly orange.
René Merting
Drachhausen (Germany)
76mm (29x) bei 29x ein weit getrenntes Pärchen, B ist eine Größenklasse schwächer - A ist buttergelb, B wirkt noch etwas dunkelgelblicher
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x weit getrennt, Komponente A hellgelb, B dagegen orangefarben - sehenswert
Sarah Gebauer
Germany
150mm (125x) gut gefunden, beide Sterne stehen in weitem Abstand zueinander
Robert Zebahl
Leipzig (Germany)
200mm (37x) Conditions in the target region: SQM-L 19.9
Easy to split, evident. Both components appeared slightly orange colored.
STF2449 7m2 7m7 8.0'' 289° 2015 Aql 19h06m23.04s +07°09'20.10"
Robert Zebahl
Leipzig (Germany)
70mm (22x) At 22x well separable, but quite close together. Some fainter and similarly bright stars in the immediate surrounding. At 57x small difference in brightness. Main component looked white-bluish, companion slightly orange.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein knapp getrenntes Pärchen - B-Komponente westlich nur unwesentlich schwächer - beide Sterne heiraten in weiß - STF2449 ist ein schönes Doppel-Doppel zusammen mit dem 37' südlich stehenden STF2446, wo die Komponenten einen ähnlichen Abstand haben
★★ STF2455 AB 7m4 9m4 9.6'' 28° 2015 Vul 19h06m53.00s +22°10'21.50"
AC 7m4 12m3 99.6'' 20° 2015
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x noch dicht beieinander, bei 64x gut getrennt - wie STF2455 und der nahe STF2457 (25' südlicher) sich gegenüberstehen und die jeweils schwächere Komponente in Richtung des anderen Doppelsterns vor sich herschiebt, das hat was - als ob die beiden Fußball spielen (die jeweilige Komponente A hat einen Ball vor den Füßen) - zwischen den beiden Doppelsternen steht ein schwacher Stern, vermutlich der verwirrte Schiedsrichter
Mark McCarthy
Fremont (California/USA)
317mm (277x) AB: Yellow and yellow-orange, 1 delta mag, very wide.
Mark McCarthy
Fremont (California/USA)
508mm (205x) AB: Wide ~2 delta mag, light yellow-white A and dull B. Not physical
★★ STF2457 7m5 9m5 10.2'' 201° 2015 Vul 19h07m08.02s +22°35'03.70"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x gut getrennt, bei 64x schon ein ordentlicher Abstand - wie STF2457 und der nahe STF2455 (25' nördlicher) sich gegenüberstehen und die jeweils schwächere Komponente in Richtung des anderen Doppelsterns vor sich herschiebt, das hat was - als ob die beiden Fußball spielen (die jeweilige Komponente A hat einen Ball vor den Füßen) - zwischen den beiden Doppelsternen steht ein schwacher Stern, vermutlich der verwirrte Schiedsrichter
Christopher Hay
Seeheim (Germany)
150mm (96x) Widely split. Attractive together in 0.8-degree FOV with Struve 2455AB a little less than half a degree south. The secondaries of the two doubles point towards each other, a nice sort of double-double. According to Stelledoppie 2457 is a physical double, while 2455AB is not. In 2457 the brightness of both components is less than those of 2455AB, their separation greater, and their colour contrast (itself hard to define) is greater. In 2455AB focussing on the A-component precisely is hard to achieve, perhaps due to an unresolved field star very close to it?
Mark McCarthy
Fremont (California/USA)
203mm (333x) Pale yellow stars, wide separation, 1.5 delta mag.
STF2461, 17 Lyr AB 5m3 9m1 3.2'' 281° 2017 Lyr 19h07m25.58s +32°30'06.20"
René Merting
Drachhausen (Germany)
100mm (142x) nichts zu holen für mich bis 142x, vermutlich verhindert der große Helligkeitsunterschied die Trennung
Robert Zebahl
Leipzig (Germany)
152mm (129x) At 129x clearly split. The B component was just visible as pretty faint, tiny star. At 270x much easier visible.
Mark McCarthy
Fremont (California/USA)
317mm (553x) 17 Lyr. Yellow and red, much fainter B ~3 delta mag.
Mark McCarthy
Fremont (California/USA)
508mm (667x) 17 Lyr. Huge delta mag. B is obvious in 20", though A's diffraction was horrible. Used mask to clean it up but the B star momentarily disappeared, though I could eventually pull it back out with seeing and critical focus. 4 delta mag.
★★ STF2470 7m0 8m4 13.8'' 267° 2017 Lyr 19h08m45.20s +34°45'37.10"
Robert Zebahl
Leipzig (Germany)
16x70 2020-07-06: Striking with well visible brightness difference. Very nice together with STF2474, which gives a similar view. A double-double for binoculars.
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x knapp getrennt - wunderschönes Synchrontänzer-Doppel-Doppel zusammen mit STF2474 unmittelbar 10' südlich, weil A und B bei beiden Paaren mit gleichen Helligkeiten und Positionswinkel strahlen - A-Komponente von STF2470 knapp schwächer als A-Komponente von STF2470
Robert Zebahl
Leipzig (Germany)
102mm (40x) Striking, especially with STF 2474 in one visual field. The color of the components was not clearly visible. Worthwhile! Sketch see STF 2474.
Sarah Gebauer
Germany
150mm (85x) nach mehreren Anläufen dann gefunden und bei 85x wie ein Doppel-Doppel im Bild, sehr sehenswert, auch der Abstandsunterschied (13,8'' bei STF 2470 und 15,9'' bei STF 2474) ist zu erkennen ../projects/double-stars/sarah-gebauer/sketches/20200723%20STF2470-4%20DSk.jpg
★★ STF2474 AB 6m8 7m9 16.0'' 263° 2019 Lyr 19h09m04.35s +34°35'59.90"
Robert Zebahl
Leipzig (Germany)
16x70 2020-07-06: Striking with well visible brightness difference. Very nice together with STF2470, which gives a similar view. A double-double for binoculars.
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x knapp getrennt - wunderschönes Synchrontänzer-Doppel-Doppel zusammen mit STF2470 unmittelbar 10' nördlich, weil A und B bei beiden Paaren mit gleichen Helligkeiten und Positionswinkel strahlen - A-Komponente von STF2474 knapp heller als A-Komponente von STF2470 - bei 64x Komponente A ein wenig gelblich
Robert Zebahl
Leipzig (Germany)
102mm (40x) Pretty conspicuous, easy double star. Especially attractive with the nearby double star STF 2470, as both are very similar in brightness, distance and position angle. The color of both components appeared slightly yellowish-orange. ../projects/double-stars/robert-zebahl/sketches/2019-06-26_stf2470_stf2474.jpg
Sarah Gebauer
Germany
150mm (85x) nach mehreren Anläufen dann gefunden und bei 85x wie ein Doppel-Doppel im Bild, sehr sehenswert, auch der Abstandsunterschied (13,8'' bei STF 2470 und 15,9'' bei STF 2474) ist zu erkennen ../projects/double-stars/sarah-gebauer/sketches/20200723%20STF2470-4%20DSk.jpg
Christopher Hay
Seeheim (Germany)
150mm (96x) Widely separated. Component A yellowish, B light ice-blue. A true physical pair in 171 LY distance. Very attractive in field of view together with Struve 2470 about 10 arcseconds north. The components of each of the two Struves have almost the same position angles, similar separations and very similar delta-magnitudes. Struve 2470 is like an echo of 2474 but with no definite colour impression.
STF2486 AB 6m5 6m7 7.1'' 204° 2019 Cyg 19h12m05.03s +49°51'20.70"

../images/binary-star-orbits/STF2486-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
16x70 2020-07-03: Fine split, but very tight with equally bright components.
Robert Zebahl
Leipzig (Germany)
70mm (22x) At 22x barely split with a slight difference in brightness. At 44x the primary looked orange. I could not determine the color of the companion.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal yellow pair.
BU139 & STTA177, V338 Sge BU139 AB 7m1 8m0 0.6'' 136° 2017 Sge 19h12m34.45s +16°50'47.20"
STTA177 AC 7m1 8m0 98.4'' 276° 2017
BU139 AE 7m1 11m2 28.8'' 101° 2015
BU139 CD 8m0 11m2 138.9'' 269° 2015

../images/binary-star-orbits/BU139-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
80mm (13x) STTA177 (AC): Near equal wide pair split in finder
Mark McCarthy
Fremont (California/USA)
203mm (667x) BU139 (AB): At the very best moments of seeing, which were fleeting, saw kissing disks to hairline split. Suspected elongation at 205x & 333x.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) BU139 (AB): getrennt, schwierig, 0,6"? ../projects/double-stars/frederik-wanink/sketches/BU139.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) BU139 (AB): V338 Sge. Overlapping airy disks.
Mark McCarthy
Fremont (California/USA)
317mm (553x) STTA177 (AC): Very wide orange-yellow and blue, ~2-3 delta mag.
★★ STF2496 AB 6m5 10m0 2.1'' 81° 2015 Cyg 19h15m19.18s +50°04'16.00"
AC 6m5 11m2 186.1'' 242° 2003
Robert Zebahl
Leipzig (Germany)
152mm (270x) AB: In steadier moments, the much fainter companion can be seen near the first diffraction ring of the primary component.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Very much fainter B, a pin prick when seeing stills. 3 delta mag, ~2"
STT371 AB 7m0 7m5 0.9'' 161° 2018 Lyr 19h15m56.96s +27°27'21.40"
AB-C 7m0 9m8 47.2'' 269° 2019
René Merting
Drachhausen (Germany)
100mm (20x) AB-C: bei 20x ist Komponente C im Westen schwach erkennbar in einem ordentlichen Abstand zu Komponente AB
Mark McCarthy
Fremont (California/USA)
203mm (333x) AB: Bright pair showed best masked down to 8-inches. Near equal, white stars, perfect!
Frederik Wanink
Itterbeck (Germany)
254mm (640x) AB: getrennt ../projects/double-stars/frederik-wanink/sketches/STT371.jpg
★★ S715 7m1 7m9 8.4'' 17° 2018 Sgr 19h17m39.96s -15°58'01.70"
René Merting
Drachhausen (Germany)
76mm (29x) bei 29x auffällig, ein schönes enges, knapp getrenntes Paar - B im NW ist eine halbe Größenklasse schwächer -ein schönes Doppel-Doppel zusammen mit dem nur 6' östlich stehenden S 716
★★ S716 8m4 8m6 5.0'' 196° 2018 Sgr 19h18m05.55s -15°57'13.40"
René Merting
Drachhausen (Germany)
76mm (57x) bei 29x sind beide Komponenten zu erkennen, können aber noch nicht getrennt werden - bei 57x dann gelingt die Trennung - ein deutlich schwächeres Par als das unmittelbar westlich stehende Sternpaar S 715, beide zusammen bilden aber ein schönes Doppel-Doppel - sie tanzen sogar synchron, wennauch der Positionswinkel um 180° gedreht ist
STF2505 AB 8m3 9m5 10.9'' 315° 2015 Lyr 19h19m52.83s +35°32'16.60"
AC 8m3 13m3 20.8'' 224° 2015
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x gut getrenntes Pärchen - Komponente B ist nur leicht schwächer als A - Komponente A ist nicht ganz weiß, mehr wie ein zarter Stich ins gelbliche
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Orange and blue, looks like Alberio, but fainter. Wide separation.
COU1023 9m5 9m5 0.3'' 146° 2007 Lyr 19h20m23.74s +26°30'58.80"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Hairline split, very definite and consistent, near equal
TDT1416 10m5 11m1 0.7'' 298° 1991 Vul 19h23m28.49s +22°34'19.70"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Exceptionally fine, split with seeing, very faint ~1 delta mag. B resolves at first diffraction, light orange stars
★★ A2786 10m1 10m1 0.4'' 108° 2008 Vul 19h26m57.67s +21°09'02.70"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Wow! Exceptionally fine but clean split, ~1 delta split, best without apodising mask, nearly perfect seeing. In the same FOV as STF 2523.
★★ STF3132 AB 10m1 11m8 8.0'' 39° 2018 Vul 19h28m12.76s +20°12'59.60"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal orange stars with hairline split April 2019
★★★ beta Cyg, 6 Cyg, Albireo, STFA43 AB 3m2 4m7 35.2'' 54° 2019 Cyg 19h30m43.29s +27°57'34.90"
Robert Zebahl
Leipzig (Germany)
8x40 Well split, but I didn't recognised any color.
René Merting
Drachhausen (Germany)
10x50 Komponente A ist gleißend hell und stroh-gelb, Komponente B ist deutlich schwächer leicht abgesetzt von A erkennbar und strahlt eigenartig mint-grün
Christopher Hay
Seeheim (Germany)
12x36 Well split. A golden-red, B cold blue. Gorgeous!
Robert Zebahl
Leipzig (Germany)
16x70 2020-07-06: Bright orange & white-bluish.
Robert Zebahl
Leipzig (Germany)
80mm (25x) One of the most beautiful double stars in the northern hemisphere. Differences in brightness and color (orange-blue) are brilliant! Even under urban conditions with small aperture an enjoyment!
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x stehen beide Sterne weit getrennt - Komponente A mit einem satten zitronen-gelb, Komponente B mit einem leichten Stich ins Blaue
Jörg S. Schlimmer
Germany
127mm (203x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Albireo_filtered_96dpi_127mm.jpg
Sarah Gebauer
Germany
150mm (116x) Erstbeobachtung August 2019: deutlicher Farbunterschied zwischen blau und sattem Gelb zu sehen
Jörg S. Schlimmer
Germany
305mm (170x) alle Komponenten einfach zu trennen ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Albireo_filtered_96dpi_305mm.jpg
Werner E. Celnik
Rheinberg (Germany)
150mm ../projects/double-stars/werner-celnik/photographs/Albireo%202015-09-09%20Refr_150-1100%205DMkII%20ISO1600%20IDAS%20HDR_1s-2min%20kl.jpg ../projects/double-stars/werner-celnik/photographs/Albireo%202015-09-09%20Refr_150-1100%205DMkII%20ISO1600%20IDAS%20HDR_1s-2min%20cr%20kl.jpg
Werner E. Celnik
Rheinberg (Germany)
150mm ../projects/double-stars/werner-celnik/photographs/Albireo%20A9918-9920%20RGB%20A4%20mTxt%20kl.jpg
D20, V822 Aql AB 7m2 9m6 1.3'' 65° 1991 Aql 19h31m15.78s -02°06'36.70"
Mark McCarthy
Fremont (California/USA)
317mm (553x) A has a notched / trailing star in east PA, very close in and very much fainter. With seeing. Tough!
Mark McCarthy
Fremont (California/USA)
317mm (553x) tight airy disk of A, and a faint star widely separated, 3 delta mag ~25" Very near to a pretty orange carbon star.
★★ A598 AB 9m9 10m2 1.0'' 191° 2016 Cyg 19h36m29.82s +41°24'08.60"
Mark McCarthy
Fremont (California/USA)
317mm (553x) UV Cyg. Orange-red with very much fainter blue ~1", 1 delta mag. Seeing must still. A a perfect round disk the color of the setting sun. Very special.
S722 AB 7m2 7m5 10.3'' 236° 2016 Sgr 19h39m12.97s -16°54'28.30"
René Merting
Drachhausen (Germany)
76mm (29x) bei 29x wunderschön, zwei gleich helle Sterne ganz dicht aneinander geschmiegt bzw. knapp getrennt - wenn ich mich entscheiden müsste, welcher Stern schwächer ist, dann vermutlich die südwestliche Komponente - zurück auf 18x erscheinen beide Komponenten wie eine 8 kurz vor der Trennung
★★★ HN 84, V340 Sge 6m4 9m5 28.4'' 301° 2013 Sge 19h39m25.33s +16°34'16.00"
René Merting
Drachhausen (Germany)
12x50 verdammt schwer - Komponente B ist ganz schwach nordwestlich von A auszumachen - beide Sterne berühren sich noch
René Merting
Drachhausen (Germany)
16x70 beide Sterne präsentieren sich gut getrennt, nicht zu weit aber auch nicht zu nah - Komponente A meint es gut mit der Farbe gelb, bei Komponente B kann ich keine Farbe erkennen
Christopher Hay
Seeheim (Germany)
80mm (30x) Primary ruddy red, secondary wide apart but too faint for any colour impression. Straw-yellow Epsilon Saggitae half a degree to the west with its ice-blue eastern companion enhances the experience of colour contrast in the FOV and is actually more attractive than HN 84 with this aperture and power.
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x sind beide Komponenten weit getrennt - Komponente A auffällig gelb-orange, B dagegen grau-blau, ein schöner Farbkontrast, der sich bei 32x verstärkt
Sarah Gebauer
Germany
150mm (85x) Holden 84, eine sehr goldgelbe Komponente und in 28'' Abstand die zweite, sehr schwache und weiße Komponente mit einem Hauch von Blau, sehr, sehr schön!
Christopher Hay
Seeheim (Germany)
150mm (96x) Main component ruddy tangerine orange, companion wide apart and ice blue. The longer I look the stronger the colour contrast becomes, which is by no means normal in many doubles. Epsilon Saggitae in same 0.8-degree field of view is straw-yellow with a cold blue companion (a field star?) pointing away from Epsilon in the direction of HN 84. I can’t think offhand of a better colour-contrast pair that can be framed in this manner in the same FOV.
Sarah Gebauer
Germany
150mm (160x) die hellere Hauptkomponente ist deutlich und stark goldfarben, die zweite dagegen sehr schwach, silbrig und dumpf ../projects/double-stars/sarah-gebauer/sketches/HN84.jpg
A272 AB 9m8 10m4 1.3'' 193° 2009 Vul 19h40m09.48s +26°11'23.40"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Wow, I get the split, very close but split, obvious difference in magnitude, about 1 delta mag. Less than 1" sep. Impressed i could get it [CD is 15th mag and 1"!]
★★ STFA46, 16 Cyg AB 6m0 6m2 39.5'' 132° 2019 Cyg 19h41m49.09s +50°31'31.60"
Christopher Hay
Seeheim (Germany)
3x63 Self-built binoculars, hence the unusual specification. Made of top-quality teleconverters, apochromatic and sharp to the edge.
With naked eye under good suburban sky 16 Cyg is just seen. In the 3x binoculars the double is split into two finest points of light in good moments despite the low magnification. A physical pair according to Stelledoppie.

Two-star rating awarded because this is a true physical pair that can be split with the smallest binoculars and reveals increasingly more with growing binocular size (brightness disctinction between A and B in 7x50, colour distinction in 15x45).
Christopher Hay
Seeheim (Germany)
7x50 Finely split, A-component appears very slightly brighter than B-component. A very pleasing binocular pair.
Christopher Hay
Seeheim (Germany)
15x45 Wide split, very strong visual presence dominating 4.5° FOV. A-component very pale orange, B-component equally pale blue.
René Merting
Drachhausen (Germany)
18x70 zwei ordentlich getrennte fast gleich helle Sterne - beide Komponenten sind reinweiß und die hellsten Sterne im unmittelbaren Umfeld - auffällig
Mark McCarthy
Fremont (California/USA)
317mm (553x) 16 Cyg: Wide equal orange-yellow, also split in 80mm finder
★★ BU658, PS Vul 6m7 7m9 0.3'' 284° 1998 Vul 19h43m55.97s +27°08'07.50"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty orange star, subtly out of round / pear shaped. In a large cluster-like group of stars, around 3 degrees angular size, V-shaped, pretty in the finder. If the stars were brighter it would be as famous as the M45.
AGC10 & STF2570 AGC10 AB 8m4 8m4 0.2'' 140° 2000 Aql 19h44m56.78s +10°46'30.60"
STF2570 AB-C 7m6 9m8 4.3'' 277° 2016
René Merting
Drachhausen (Germany)
100mm (107x) STF2570 (AB-C): beide Komponenten erscheinen bei 107x knapp getrennt - der Begleiter ist nur ganz schwach sichtbar, wie ein Geist
Stefan Loibl
Rosenheim (Germany)
102mm (102x) STF2570 (AB-C): (AB) orange, C red-orange, faint pair, close to gamma Aql
Mark McCarthy
Fremont (California/USA)
152mm (285x) STF2570 (AB-C): Easily split, white A and much fainter ruddy B. Did not see AB, which is near equal mag. 0.2", which I could get with the 20-inch on a good night.
René Merting
Drachhausen (Germany)
320mm (72x) STF2570 (AB-C): bei 72x knapp getrenntes Pärchen, Komponente AB im Osten weiß-gelblich, C deutlich schwächer
Mark McCarthy
Fremont (California/USA)
508mm (333x) AGC10 (AB): Wide split pair. I was trying for AB 0.2" which only suggested elongation, too marginal to claim success
Mark McCarthy
Fremont (California/USA)
508mm (410x) AGC10 (AB): I can sense olive shape, very tough.
Mark McCarthy
Fremont (California/USA)
508mm (410x) STF2570 (AB-C): White and off white wide separated pair, ~1 delta mag.
STF2579, delta Cyg, 18 Cyg AB 2m9 6m3 2.7'' 215° 2017 Cyg 19h44m58.44s +45°07'50.50"

../images/binary-star-orbits/STF2579-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (200x) At 100x only indicated. At 200x the much fainter companion is visible as a slightly elongated brightening on the first diffraction ring.
Uwe Pilz
Leipzig (Germany)
105mm (288x) blauweiß ../projects/double-stars/uwe-pilz/sketches/190726DeltaCygni.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very bright white with ruddy B, ~4", 4 delta mag. Nice!
★★ STF2583, pi Aql AB 6m3 6m8 1.4'' 105° 2019 Aql 19h48m42.05s +11°48'57.30"
Stefan Loibl
Rosenheim (Germany)
102mm (205x) not fully split, seen as constricted '8'
Robert Zebahl