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 481
Visual Observations 1141
Sketches 182
Photographs 16
Observers 12
Berthold Fuchs, Sarah Gebauer, Christopher Hay, Claus-Dieter Jahn, Jens Leich, Stefan Loibl, Mark McCarthy, Rene Merting, Uwe Pilz, Joerg 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
Rene Merting
Drachhausen (Germany)
16x70 AB: ein schöner Fernglas-Doppelstern - Komponente A im Westen präsentiert sich dunkel-gelb (noch nicht orange), B im Osten ist eher weißlich
Robert Zebahl
Leipzig (Germany)
80mm (33x) AB: Nice double star. Brighter component appeared orange, the fainter more bluish.
Rene 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
Joerg 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.
Rene 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'' 17° 2018 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 11.5'' 148° 2018 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 blueish. 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"
Rene 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
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'' 235° 2017 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"
Rene 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'' 290° 2018 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.
Mark McCarthy
Fremont (California/USA)
508mm (205x) Orange star, slightly out of round.
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.
Rene Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x ist Komponente A so hell, dass B trotz des augenscheinlich großen Abstandes von 13,38" 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
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Nice yellow pair. A is a red tainted yellow, B is cleaner.
Rene 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 4.3'' 116° 2018 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'' 220° 2017 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° 2017
AD 8m6 9m7 9.0'' 194° 2017
AE 8m6 12m1 15.8'' 333° 2015
CD 8m9 9m7 7.8'' 220° 2016
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
Mark McCarthy
Fremont (California/USA)
508mm (533x) AB: L shape asterism and the short end tip star has a faint close star, AB. There's a zigzag of four faint stars making an arc beyond this short L. Given this is really an open cluster this is not surprising. [not physical]
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 1.1'' 334° 2018 And 00h54m58.02s +23°37'42.40"
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
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
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 (340x) Bright white and 3-4 delta mag blue, ~2", well split.
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 AB 5m3 5m5 29.2'' 160° 2018 Psc 01h05m40.93s +21°28'23.60"
Rene Merting
Drachhausen (Germany)
10x50 ein etwas mehr als knapp getrenntes Pärchen zweier gleichheller Sterne
Rene Merting
Drachhausen (Germany)
16x70 ein ordentlich getrenntes helles Sternpaar, die südliche B-Komponente wirkt etwas weniger weiß - schöner Anblick
Christopher Hay
Seeheim (Germany)
18x80 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.
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.
Mark McCarthy
Fremont (California/USA)
317mm (553x) White pair, B resolves with seeing, ~2", 2-3 delta mag.
zeta Psc, 86 Psc, STF100 AB 5m2 6m3 23.2'' 63° 2018 Psc 01h13m43.80s +07°34'31.80"
Christopher Hay
Seeheim (Germany)
15x45 Cleanly split. Western component distinctly brighter, no colour impression.
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"
Rene 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
Rene 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
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.
STT33 AB 7m3 9m0 26.9'' 77° 2015 Cas 01h37m22.87s +58°38'14.70"
Rene Merting
Drachhausen (Germany)
16x70 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
Rene Merting
Drachhausen (Germany)
100mm (20x) 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
Mark McCarthy
Fremont (California/USA)
317mm (340x) 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.
1 Ari, STF174 6m3 7m2 2.9'' 165° 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.
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".
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
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
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)
203mm (533x) 10 Ari Pretty white and slightly off-white or blue-white B, 2.5 delta mag, ~1.5"
Mark McCarthy
Fremont (California/USA)
317mm (553x) ~2 delta mag, ~1" very nice. ~1 disk split. Nice!
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"
★★★ STF227, iota Tri, 6 Tri 5m3 6m7 3.7'' 69° 2016 Tri 02h12m22.28s +30°18'11.10"
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
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
★★★ STF231, 66 Cet AB 5m7 7m7 16.8'' 235° 2018 Cet 02h12m47.54s -02°23'37.10"
Uwe Pilz
Leipzig (Germany)
105mm (88x) weiß und leuchtend rot! ../projects/double-stars/uwe-pilz/sketches/191129_66Cet.jpg
★★ STF232 7m8 7m9 6.5'' 66° 2016 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.
Mark McCarthy
Fremont (California/USA)
203mm (205x) Pretty white stars, only a slight delta mag, well split
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"
★★ STF262, iota Cas AB 4m6 6m9 2.9'' 230° 2017 Cas 02h29m03.96s +67°24'08.70"
AC 4m6 9m1 6.7'' 117° 2015
AD 4m6 8m5 210.9'' 60° 2016

../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
Rene 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
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-blueish and obviously fainter than B. Grand sight at 129x!
STF270 AB 7m0 9m7 21.3'' 306° 2016 Per 02h30m50.65s +55°32'54.20"
Rene Merting
Drachhausen (Germany)
16x70 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
Rene Merting
Drachhausen (Germany)
100mm (32x) 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) Nice orange star with wide B
Mark McCarthy
Fremont (California/USA)
317mm (553x) Tighter, 1 D-mag, white A reddish B.
★★ 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.
Rene 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.
★★ 30 Ari STFA5 AB 6m5 7m0 37.9'' 275° 2018 Ari 02h37m00.52s +24°38'50.00"
RAO8 BC 7m0 11m0 0.6'' 282° 2018
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'' 118° 2017 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
★★ 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".
Mark McCarthy
Fremont (California/USA)
317mm (553x) ~4", ~4 delta mag, PA to north. very faint blue but steady.
★★ 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
Rene 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
Rene 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.
STF314 AB-C 7m0 7m3 1.6'' 316° 2018 Per 02h52m52.03s +52°59'50.60"

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

Robert Zebahl
Leipzig (Germany)
152mm (129x) 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) ähnlich hell ../projects/double-stars/frederik-wanink/sketches/STF314.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) a nice half delta mag pair ~2"
Mark McCarthy
Fremont (California/USA)
317mm (553x) near equal brightness, AB more yellow yellow-white of the two, ~2 disk separation
★★ 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.
STF381 7m6 8m8 1.1'' 109° 2018 Ari 03h23m19.33s +20°58'13.90"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange-yellow with 2x fainter B, very close split, with seeing, tough one.
STF388 8m0 9m0 2.8'' 214° 2018 Per 03h28m40.39s +50°26'10.80"
Rene 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.
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
★★ 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
★★ BU536, S437, SAO76169 S437 AB-C 8m1 7m7 38.8'' 308° 2017 Tau 03h46m16.00s +24°11'23.50"
BU536 AB 8m1 9m4 1.1'' 178° 2016
BU536 CD 7m7 12m9 18.3'' 2015

../images/binary-star-orbits/BU536-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (288x) in den Plejaden
★★★ STF470, 32 Eri AB 4m8 5m9 6.9'' 349° 2018 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
STF494 7m5 7m7 5.3'' 188° 2018 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-blueish. 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-blueish. Color impression slightly more intense at 100x. Beautiful sight.
omicron 2 Eri, 40 Eri, STF518 A-BC 4m4 9m3 83.7'' 102° 2016 Eri 04h15m16.32s -07°39'10.30"
BC 9m5 11m2 8.3'' 331° 2017

../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
STF520 8m3 8m4 0.7'' 81° 2018 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.
★★ STF559 7m0 7m0 3.0'' 277° 2018 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.
★★ 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.
★★ STF653, 14 Aur AB 5m0 10m9 9.8'' 11° 2014 Aur 05h15m24.39s +32°41'15.30"
AC 5m0 7m3 14.2'' 225° 2017
AD 5m0 10m8 179.7'' 322° 2010
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!
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 3.3'' 158° 2018 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.
Rene 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 31.3'' 348° 2018 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 blueish
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 15.2'' 353° 2016
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-blueish.
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
STF730 AB 6m1 6m4 9.7'' 142° 2018 Tau 05h32m14.14s +17°03'29.30"
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.
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
Rene 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 AB 4m7 5m5 36.0'' 225° 2018 Ori 05h35m02.68s -06°00'07.20"
Rene Merting
Drachhausen (Germany)
8x30 zwei helle Sterne knapp getrennt, Komponente B im Südwesten nur knapp schwächer
Rene Merting
Drachhausen (Germany)
100mm (20x) 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
STF752, 44 Ori, iota Ori, Nair Al Saif, Hatysa AB 2m8 7m7 11.4'' 142° 2017 Ori 05h35m25.98s -05°54'35.60"
AC 2m8 9m8 49.4'' 103° 2002
BC 7m7 9m8 41.1'' 94° 2015
Rene 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

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
Rene 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
★★★ sigma Ori, 48 Ori, STF762, STF3135, BU1032 BU1032 AB 4m1 5m3 0.3'' 77° 2015 Ori 05h38m44.77s -02°36'00.20"
STF762 AB-C 3m8 8m8 11.6'' 237° 2016
STF762 AB-D 3m8 6m6 12.9'' 84° 2018
STF762 AB-E 3m8 6m3 41.5'' 62° 2018
STF762 DC 6m6 8m8 23.7'' 253° 2018
STF762 EC 6m3 8m8 52.9'' 241° 2018
STF762 ED 6m3 6m6 29.9'' 233° 2018
STF3135 AB-F 3m8 7m9 208.0'' 324° 2016
Rene 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 STF791 ../projects/double-stars/uwe-pilz/sketches/200212sigmaOri.jpg
★★★ STF764 6m4 7m1 25.6'' 14° 2017 Aur 05h41m20.98s +29°29'14.70"
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. A nice double star for binoculars.
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
Mark McCarthy
Fremont (California/USA)
317mm (277x) two bright whites widely separated
★★ 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.
★★ STF791 AB 9m1 10m0 5.0'' 91° 2019 Aur 05h50m03.41s +39°34'34.70"
AC 9m1 11m2 60.7'' 214° 2015
Uwe Pilz
Leipzig (Germany)
320mm (80x) A und B sind deutlich orange. Im selben Feld wie Sigma Orionis ../projects/double-stars/uwe-pilz/sketches/200212sigmaOri.jpg
STF805 8m4 8m9 12.1'' 50° 2015 Tau 05h51m48.20s +28°26'59.60"
Rene 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.
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"
Rene 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) Well split with obvious difference in brightness.
Christopher Hay
Seeheim (Germany)
125mm (100x) 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) 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) 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 12.0'' 29° 2017 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, BU570 STF919 AB 4m6 5m0 7.1'' 133° 2017 Mon 06h28m49.07s -07°01'59.00"
STF919 AC 4m6 5m4 9.8'' 125° 2018
STF919 BC 5m0 5m3 2.6'' 108° 2018
BU570 AD 4m6 12m1 26.5'' 56° 2014
Rene Merting
Drachhausen (Germany)
18x70 STF919 (AB): 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
Rene 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
FAB5 Aa-Ab 7m2 9m6 0.9'' 18° 1991 Mon 06h31m40.54s +05°46'08.80"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Misshapen disk at best moments, very difficult
★★ STF924, 20 Gem AB 6m3 6m9 20.7'' 212° 2017 Gem 06h32m18.52s +17°47'03.40"
BC 6m9 13m0 47.8'' 144° 2014
Rene 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, decent 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-blueish.
★★ 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-blueish; 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, decent orange. At 125x A appeared orange, B grey-blueish.
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!
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
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.
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 8.8'' 310° 2018

../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.
STF982, 38 Gem AB 4m8 7m8 7.4'' 143° 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) Pretty yellow and orange, 2 delta mag, wide separation
Mark McCarthy
Fremont (California/USA)
371mm (553x) Bright orange and slightly red star, 2-3 delta mag.
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
Robert Zebahl
Leipzig (Germany)
70mm (22x) All 3 components form a striking triangle and are slightly different in color. A (western component): white-blueish; 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
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.
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'' 259° 2018 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) Yellow-orange and blue stars, PA to the east, 1 delta mag, tight but well split ~1".
Mark McCarthy
Fremont (California/USA)
371mm (553x) Split when seeing stills. orange A and yellowing B, 1.5-2”
★★ 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 decent 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
★★ 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.
★★ HJ3945 AB 5m0 5m8 26.8'' 50° 2015 CMa 07h16m36.84s -23°18'56.10"
Rene Merting
Drachhausen (Germany)
8x30 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
Rene Merting
Drachhausen (Germany)
10x50 ein knapp getrenntes Paar (nicht besser als im 8x30) - Komponente A leicht gelblich, B ist kühler, weißlich
Rene Merting
Drachhausen (Germany)
18x70 ein gut getrenntes Pärchen - Komponente A im Südwesten ist apfelsinenorange, B wirkt anfangs eisblau, bei längerer Betrachtung weißgrau
Rene Merting
Drachhausen (Germany)
100mm (20x) 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) soforrt auffallend, blau-orange ../projects/double-stars/uwe-pilz/sketches/hj3945.jpg
Robert Zebahl
Leipzig (Germany)
120mm (23x) 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.
★★★ STF1110, alpha Gem, 66 Gem, Castor AB 1m9 3m0 5.4'' 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.
Rene 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
★★ 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° 2017 CMi 07h40m06.99s +05°13'51.90"

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

Mark McCarthy
Fremont (California/USA)
203mm (333x) A bit more delta mag than listed, split, white, rather bright pair
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wow, very close <1" hair-split, near equal brightness
★★ STF1127 AB 7m0 8m4 5.6'' 340° 2019 Cam 07h47m00.43s +64°03'07.30"
AC 7m0 9m7 11.7'' 179° 2017
BC 8m4 9m7 17.0'' 173° 2017
Rene 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
BU101, 9 Pup 5m6 6m5 0.4'' 304° 2018 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'' 22° 2018 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)
317mm (553x) Orange A is not quite round. Marginal
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 3.6'' 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.
Rene 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
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"
★★★ STF1196, zeta Cnc, 16 Cnc AC 5m3 5m8 6.3'' 51° 2019 Cnc 08h12m12.79s +17°38'51.20"
AB-C 4m9 5m8 6.0'' 64° 2018
AB 5m3 6m2 1.1'' 2018

../images/binary-star-orbits/STF1196-AB-C-orbit.jpg ../images/binary-star-orbits/STF1196-AB-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
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
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
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) AB: 2+1 system, the +1 star is HUT 1. STF 1196AB make a nice tight pair. They are all nearly the same magnitude, white & brilliant
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.
★★ STF1193 AB 6m2 9m7 42.4'' 90° 2015 UMa 08h20m40.32s +72°24'26.00"
Rene Merting
Drachhausen (Germany)
320mm (45x) 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
STF1223, phi 2 Cnc 6m2 6m2 5.4'' 218° 2019 Cnc 08h26m47.08s +26°56'07.80"
Uwe Pilz
Leipzig (Germany)
105mm (88x) sehr schön, blauweiß-gelbweiß ../projects/double-stars/uwe-pilz/sketches/stf1223.jpg
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 10.1'' 25° 2018 Hya 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
Rene 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
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
★★ 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) Dull orange with fairly faint 10.5 mag B, wide separation
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"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Striking, widely separated with noticeable difference in brightness. Moderate but beautiful color contrast: white-yellowish and grey-blueish.
Robert Zebahl
Leipzig (Germany)
102mm (28x) Grand sight! Pretty wide apart and unequal. A: decent 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 (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) 80mm finder split, beautiful yellow and blue. Scope view real nice. Very good diffraction and airy disks.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Iot Cnc: Pretty orange and pale blue, showpiece object.
★★★ STF1273, 11 Hya, epsilon Hya AB-C 3m5 6m7 2.9'' 309° 2017 Hya 08h46m46.51s +06°25'07.70"

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

Robert Zebahl
Leipzig (Germany)
70mm (133x) Not split. Although a slight brightening was visible in the first diffraction ring, it could also have come from slight coma of the refractor.
Uwe Pilz
Leipzig (Germany)
105mm (200x) bei 144x schwierig ../projects/double-stars/uwe-pilz/sketches/200323epsHya.jpg
Mark McCarthy
Fremont (California/USA)
508mm (533x) 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]
STF1291, 57 Cnc AB 6m1 6m4 1.6'' 309° 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
★★ BU408 7m3 9m6 2.8'' 345° 2018 UMa 08h59m00.62s +63°25'42.80"
Rene 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'' 285° 2017 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
★★ STF1347 7m3 8m3 21.1'' 312° 2016 Hya 09h23m15.76s +03°30'05.00"
Rene 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"
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, kap Leo AB 4m6 9m7 2.0'' 209° 2015 Leo 09h24m39.28s +26°10'56.80"
Mark McCarthy
Fremont (California/USA)
317mm (553x) 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 1.3'' 334° 2016 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

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"
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.
Rene 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
Rene 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.
Rene 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-blueish. 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
Rene Merting
Drachhausen (Germany)
320mm (45x) AB: bei 45x ein schönes enges Paar zweier gleich heller Sterne, beide strahlen weiß
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° 2016 Sex 09h54m06.70s +04°56'43.50"
Rene 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.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very tight but clear split, ~1", 1 delta mag. A slightly green, B a little orange.
STT523, 39 Leo 5m8 11m3 7.9'' 300° 2017 Leo 10h17m14.53s +23°06'22.30"
Rene 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)
317mm (553x) Unremarkable star with wide, very faint B
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 4.9'' 126° 2019 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.
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.
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"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Bright yellow and yellow-white, 1 delta mag.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very bright yellow, 1 delta mag wide.
Rene 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

Rene 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
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'' 149° 2017 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"

../images/binary-star-orbits/HU879-orbit.jpg

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
STF1447 7m5 8m9 4.6'' 124° 2019 Leo 10h33m47.28s +23°21'02.40"
Rene Merting
Drachhausen (Germany)
100mm (64x) bei 64x ist Komponente B ganz schwach südöstlich von A knapp abgesetzt zu erkennen - Helligkeitsunterschied 2-3 Größenklassen (lt. Stelle Doppie nur 1.36 mag)
Mark McCarthy
Fremont (California/USA)
317mm (277x) Faint white and red-orange, PA to the east, pretty wide 6". Nice pair.
Mark McCarthy
Fremont (California/USA)
317mm (277x) Both white, A (7.5) 2x brighter than B (8.9). Wide separation (4").
Mark McCarthy
Fremont (California/USA)
508mm (333x) Nice pair of yellow stars, ~1.5 delta mag, wide
STF1448 AC 7m5 9m6 10.9'' 259° 2011 Leo 10h34m23.24s +21°35'36.40"
Rene Merting
Drachhausen (Germany)
100mm (32x) 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) Pretty orange and blue pair, 2 delta mag, ~10"
Mark McCarthy
Fremont (California/USA)
317mm (277x) An orange and blue pair. Fainter than Alberio but just as pretty.
STF1450, 49 Leo 5m8 7m9 2.2'' 156° 2017 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
★★ STT229 7m6 7m9 0.7'' 256° 2017 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.
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
COU1422 Ba-Bb 11m2 11m5 0.6'' 38° 2008 UMa 11h01m48.52s +36°41'14.60"

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

Mark McCarthy
Fremont (California/USA)
762mm (1219x) 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.
★★ 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 AB 7m5 8m0 0.7'' 314° 2017 Leo 11h13m40.99s +20°07'43.30"

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

Uwe Pilz
Leipzig (Germany)
105mm (200x) länglich ../projects/double-stars/uwe-pilz/sketches/200327stf1517.jpg
Mark McCarthy
Fremont (California/USA)
317mm (340x) Very tight, hair split small orange stars of equal magnitude. Wow!
Mark McCarthy
Fremont (California/USA)
508mm (533x) 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
HJ4433, 81 Leo AB 5m6 10m8 55.4'' 2018 Leo 11h25m36.37s +16°27'23.50"
Rene Merting
Drachhausen (Germany)
100mm (64x) 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) bright orange-yellow A with a much fainter blue B, widely separated, a beautiful sight.
Mark McCarthy
Fremont (California/USA)
317mm (340x) 81 Leonis: Bright yellowish A, very faint bluish B, wide separation
Rene Merting
Drachhausen (Germany)
320mm (45x) 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 28.4'' 150° 2018 Leo 11h26m45.32s +03°00'47.20"
Stefan Loibl
Rosenheim (Germany)
10x50 clearly split, little difference in magnitude
Rene 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.
Rene 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"
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 15.5'' 332° 2018 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.
Rene 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
Mark McCarthy
Fremont (California/USA)
317mm (340x) Bright yellow A, 3x fainter red B. Wide separation.
Mark McCarthy
Fremont (California/USA)
317mm (340x) 88 Leonis: A favorite! Yellow and blue pair, wide
Rene 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
Rene 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
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 AB 6m4 6m8 0.8'' 149° 2016 Leo 11h36m17.94s +27°46'52.70"

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

Frederik Wanink
Itterbeck (Germany)
254mm (640x) blickweise gerade eben trennbar ../projects/double-stars/frederik-wanink/sketches/STF1555.jpg
Mark McCarthy
Fremont (California/USA)
317mm (443x) Nice! AB tight hair-split white pair, with fainter & wide separated AB-C in a row to the east.
Mark McCarthy
Fremont (California/USA)
508mm (553x) Hairline split at 333x, clear split with 533x, very close ~0.5", bright. Part of plus one
HJ503 AB-C 5m8 11m2 22.5'' 156° 2016 Leo 11h36m17.94s +27°46'52.70"
Mark McCarthy
Fremont (California/USA)
317mm (443x) Nice! STF 1555AB tight hair-split white pair, with fainter & wide separated C in a row to the east.
BU603 AB 6m0 8m5 1.0'' 329° 2018 Leo 11h48m38.71s +14°17'03.20"

../images/binary-star-orbits/BU603-AB-orbit.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"
Rene 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
Rene 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
Rene 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
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!
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"
Rene 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"
Rene 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)
102mm (28x) Very beautiful view with moderate distance and difference in brightness. A: glossy, light orange, B: white- bluish.
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!
Mark McCarthy
Fremont (California/USA)
203mm (205x) COM 24. Very pretty bright light orange and fainter blue, wide separation.
Mark McCarthy
Fremont (California/USA)
317mm (443x) 24 Com. Pretty orange and blue pair, 2 delta mag, very wide
★★ 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 2.7'' 2018 Vir 12h41m39.60s -01°26'57.90"

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

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
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)
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.
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.
Rene 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"
Rene 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
Mark McCarthy
Fremont (California/USA)
317mm (443x) Wide white pair, 1 delta mag
Mark McCarthy
Fremont (California/USA)
317mm (553x) Brighter white A, 0.5 delta mag B, pretty wide separation.
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.
Mark McCarthy
Fremont (California/USA)
203mm (667x) At 205x see nothing. 410x suspect elongation. 667x see a fleeting, bluish point just outside of first diffraction ring. A is light yellow orange and bright, 2 delta mag. to B. A feels elongated / egg shaped. At 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"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Beautiful view. Clearly unequal with nice angular distance. Primary component appeared in pale yellow, secondary component silvery-white.
Rene 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.
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.
Rene 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 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'' 314° 2015 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
Mark McCarthy
Fremont (California/USA)
203mm (667x) Probably 2" separation, 2 delta mag. Tough observation
Mark McCarthy
Fremont (California/USA)
203mm (667x) 39 Com. Probably 3" separation, 2 delta mag.
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 0.5'' 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!
BU800 AB 6m7 9m5 7.6'' 104° 2018 Com 13h16m51.05s +17°01'01.90"

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

Mark McCarthy
Fremont (California/USA)
203mm (205x) Lovely yellow and orange, very pretty. Wide separation, 2.5 delta mag.
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 14.4'' 153° 2017 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
Rene 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
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)
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
Joerg 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
Robert Zebahl
Leipzig (Germany)
../projects/double-stars/robert-zebahl/photographs/2020-04-06_zeta_uma.jpg
★★ A567 6m2 9m7 1.4'' 254° 2018 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 1.7'' 99° 2018 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!
Mark McCarthy
Fremont (California/USA)
203mm (333x) AB: 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"
Rene Merting
Drachhausen (Germany)
100mm (107x) 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) 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"
Christopher Hay
Seeheim (Germany)
80mm (63x) 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) 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) 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
Mark McCarthy
Fremont (California/USA)
317mm (553x) Bright white and 3-4 delta magnitude reddish B, 4-5" to SW.
Berthold Fuchs
Wiesbaden (Germany)
130mm 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.
S654 AB 5m6 8m9 71.3'' 239° 2018 CVn 13h46m59.77s +38°32'33.70"
Rene Merting
Drachhausen (Germany)
100mm 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° 2018 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.
Rene 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
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'' 99° 2016 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
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.
Rene 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
Rene 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
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.
★★ BU1111 BC 7m4 7m7 0.3'' 16° 2018 Boo 14h23m22.59s +08°26'41.70"

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

Mark McCarthy
Fremont (California/USA)
508mm (1067x) 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
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'' 283° 2018 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.
Rene 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)
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
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
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) Seeing distorts the A star into messy diffraction, but can see a much fainter orange star, seen as a point, outside the diffraction, 5-6", very fine!
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

Rene 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) White, fairly close ~3", half delta mag.
Mark McCarthy
Fremont (California/USA)
203mm (333x) White, fairly close ~3", half delta mag.
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
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange-white, 3 delta mag, ~5"
STF1888, xi Boo AB 4m8 7m0 5.3'' 300° 2018 Boo 14h51m23.38s +19°06'01.70"

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

Sarah Gebauer
Germany
150mm (83x) 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)
203mm (205x) A star a very pretty light yellow with 2 delta mag. light orange B star, ~5" separation
Mark McCarthy
Fremont (California/USA)
203mm (205x) A star a very pretty light yellow with 2 delta mag. light orange B, ~5".
Mark McCarthy
Fremont (California/USA)
317mm (277x) Xi Boo Pretty yellow & orange pair, 2 delta mag, ~8".
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty. Yellow and orange pair, ~6", 3 delta mag.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Xi Boo. Short period. Richly colored yellow and orange stars, ~1 delta mag, ~5" separation, with several other stars in view. Very pretty
STT287 8m4 8m6 0.5'' 2018 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
STF1909, 44 Boo 5m2 6m1 0.4'' 91° 2018 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)
BU119 AB 8m1 8m8 2.3'' 275° 2017 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”
STF1932 AB 7m3 7m4 1.4'' 268° 2019 CrB 15h18m20.19s +26°50'24.70"

../images/binary-star-orbits/STF1932-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) Near equal, yellowish white, ~2"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Near equal, yellowish white, ~2"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Very beautiful near equal white stars, ~1.5"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) gleich hell, getrennt ../projects/double-stars/frederik-wanink/sketches/STF1932.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal yellow-white, very close but clean split, ~1.5". Nice!
★★ 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'' 258° 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
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 STFA28, mu 1 Boo, 51 Boo AB 4m3 7m1 109.0'' 172° 2018 Boo 15h24m29.54s +37°22'37.10"
STF1938, mu 2 Boo Ba-Bb 7m1 7m6 2.3'' 2019

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

Robert Zebahl
Leipzig (Germany)
8x40 STFA28 (AB): Easily split with obvious difference in brightness.
Rene 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) 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) STF1938 (Ba-Bb): Tight 3 detla mag pair, fainter than the bright white A star Mu Boo.
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
★★ STF1941 9m7 9m8 1.4'' 212° 2017 CrB 15h25m42.81s +26°37'40.50"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Faint stars, noticeable mag difference, very close ~1"
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)
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)
203mm (333x) Dull orange A star, 1.5 delta mag to B, B star ~4", a flatter orange color
Mark McCarthy
Fremont (California/USA)
203mm (333x) Dull orange A, 1.5 delta mag, B ~4", a flatter orange color.
Mark McCarthy
Fremont (California/USA)
317mm (277x) Very fine orange pair 2 delta mag, ~1.5”. B appears fine and delicate.
Mark McCarthy
Fremont (California/USA)
317mm (340x) 72 Vir: Bright A and very faint B, widely separated.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty orange and pale orange, 2 delta mag, ~4"
COU610, the CrB 4m3 6m3 0.8'' 198° 2016 CrB 15h32m55.78s +31°21'32.90"
Mark McCarthy
Fremont (California/USA)
203mm (667x) Notched/snowman at best moments. B definitely fainter and almost blue. looks like an appendage. 20" too messy. I tried this one in 2018 with a 30" scope and failed.
Mark McCarthy
Fremont (California/USA)
203mm (667x) Notched/snowman at best moments. B definitely fainter and almost blue. Very faintly split, looks like a blue appendage.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) nicht als DS gesehen
Mark McCarthy
Fremont (California/USA)
317mm (738x) Tried pretty hard at 553x with apodizing screen, but dances too much. Used 6mm ortho with barlow, 738x, and at best moment it is olive shaped, but marginal. Observation August 2018
Mark McCarthy
Fremont (California/USA)
762mm (915x) The CrB: Fractured and dancing seeing. 915x, at full aperture and with 8-inch aperture mask, I see a slight out of roundness.
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)
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 split.
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 AC 8m1 8m1 14.5'' 90° 2017 CrB 15h38m12.91s +36°14'48.60"
CD 8m1 9m0 1.5'' 21° 2019

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

Rene Merting
Drachhausen (Germany)
100mm (20x) AC: bei 20x ein gut getrenntes Pärchen gleich heller Sterne, auffallend im Sternumfeld
Robert Zebahl
Leipzig (Germany)
102mm (62x) 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) AC: Nice double star, well split with equally bright components.
Mark McCarthy
Fremont (California/USA)
317mm (277x) 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) CD: Split, light orange 1 delta mag pair
Mark McCarthy
Fremont (California/USA)
317mm (553x) Faint near equal pair about 3" separation. In the same field with HU 1167. Magnificent
★★ HU1167 AB 8m1 9m9 1.4'' 80° 2016 CrB 15h38m12.91s +36°14'48.60"

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

Mark McCarthy
Fremont (California/USA)
317mm (553x) Bright star with much fainter pair, about 1" separation, 3-4 delta mag. In same field with STF 1964. Magnificent
STF1967, gam CrB 4m0 5m6 0.6'' 111° 2012 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
Mark McCarthy
Fremont (California/USA)
203mm (667x) Gamma CrB. Definite mis-shape, oval to egg.
★★ 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"
Rene 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, bet 1 Sco AC 2m6 4m5 13.0'' 20° 2018 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.
COU1276 10m9 12m9 2.7'' 55° 2006 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.
STF2025 8m0 9m8 2.6'' 164° 2015 Her 16h11m11.71s +47°33'36.10"
Rene 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)
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!
H5 6, nu Sco AC 4m3 6m6 41.3'' 337° 2018 Sco 16h11m59.74s -19°27'38.30"
Christopher Hay
Seeheim (Germany)
15x45 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.
STF2021, 49 Ser AB 7m4 7m5 4.0'' 358° 2019 Ser 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.
Rene 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)
317mm (553x) Equal yellow-white stars, ~4".
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"
Rene Merting
Drachhausen (Germany)
100mm (107x) 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) nice faint pair, both components orange
lambda Oph, 10 Oph, STF2055, Marfic AB 4m2 5m2 1.6'' 45° 2018 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
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 90.0'' 193° 2017 Dra 16h36m13.72s +52°55'27.80"
STF2078, 17 Dra AB 5m4 6m4 3.3'' 104° 2018
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) STF2078 (AB): 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.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) STF2078 (AB): sehr schönes Dreiersystem ../projects/double-stars/frederik-wanink/sketches/17Dra.jpg
STF2084, zeta Her, 40 Her 3m0 5m4 1.6'' 115° 2018 Her 16h41m17.16s +31°36'09.80"

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

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
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
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) AC: Yellow and much fainter blue wide separation.
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
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"
★★ 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

Rene 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
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) White and 4 delta mag B, 4". Nice!
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)
★★ 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
Robert Zebahl
Leipzig (Germany)
102mm (125x) AB: Easy to separate. Beautiful sight. Components equally bright with no discernible color difference.
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
★★ 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.
★★ STF2140, alpha Her, 64 Her, Ras Algethi AB 3m5 5m4 4.8'' 105° 2018 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.
Rene 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.
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!
Mark McCarthy
Fremont (California/USA)
317mm (553x) Bright orange and blue-green-grey B.
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 13.5'' 292° 2018 Her 17h15m01.92s +24°50'22.50"
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 (277x) Delta Her: Nice wide pair, good image quality, yellow and lighter yellow
Mark McCarthy
Fremont (California/USA)
317mm (553x) Sarin. Very bright and much fainter B, looks like a planet
★★ STT328, 68 Her 4m7 10m3 4.5'' 56° 2017 Her 17h17m19.57s +33°06'00.40"
Mark McCarthy
Fremont (California/USA)
317mm (277x) Very bright A & much fainter B, fairly widely separated.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Faint but steadily held B, ~8", 4 delta mag. Nice!!
★★ 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.
★★ A2184 AB 7m3 10m6 1.6'' 41° 2018 Her 17h27m32.79s +16°27'24.50"
Mark McCarthy
Fremont (California/USA)
508mm (667x) 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 1/2 Dra, 24/25 Dra 4m9 4m9 62.1'' 311° 2017 Dra 17h32m15.88s +55°10'22.10"
Christopher Hay
Seeheim (Germany)
6x20 Split, but not the fine sight it becomes in the 10x42.
Christopher Hay
Seeheim (Germany)
10x42 Clearly split, components of identical brightness, no colour. One of the finest doubles for 10x.
Rene 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
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).
★★★ 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.
★★ STF2241, psi 1 Dra, 31 Dra AB 4m6 5m6 30.1'' 17° 2018 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.
Rene 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
★★★ 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
★★ 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.
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.
★★ STF2308 40/41 Dra AB 5m7 6m0 18.7'' 232° 2018 Dra 18h00m09.07s +80°00'13.70"
AC 5m7 8m3 224.7'' 129° 2015

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

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.
Rene 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.
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 0.0'' 79° 2018 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

Rene 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
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) Extremely faint B, just on diffraction ring, with seeing, both 553x & 885x. ~1"
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"
Mark McCarthy
Fremont (California/USA)
317mm (553x) 99 Her. Faint point seen in the diffraction of brighter star disk.
★★ 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.
H5 7, BU292, HJ2822, SLV7, 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
Rene 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
ES1651, TZ Lyr 11m2 12m4 2.4'' 2003 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.
STF2323, 39 Dra AC 5m1 8m0 89.1'' 19° 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
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)
317mm (553x) Near contact / overlapping disks, 0.5 delta mag. September 2017
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.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Close in pair to A in the 20" but it disappeared in 8", 1 delta mag.
STF2337 AB 8m1 9m1 16.6'' 297° 2018 Sct 18h34m55.15s -14°42'10.60"
Rene 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 0.9'' 2018 Her 18h35m30.40s +23°36'19.90"

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

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.
★★ STT358 AB 6m9 7m1 1.7'' 149° 2018 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.
STF2351 7m6 7m6 5.0'' 160° 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.
Rene 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
Joerg 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
Joerg 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!
★★★ 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'' 346° 2018
STF2383, 5 Lyr, epsilon 2 Lyr CD 5m2 5m4 2.4'' 75° 2018

../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)
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.
Rene Merting
Drachhausen (Germany)
100mm (107x) STF2382 (AB): bei 64x ist das Sternpaar mit leichter Einschnürung und Nord-Süd-Ausdehnung erkennbar - beide Sterne stehen minimal enger zusammen als das südlichere Paar STF2383 - bei 107x knappe Trennung, Komponente B nördlich ist mindestens eine halbe Größenklasse schwächer als A
Rene Merting
Drachhausen (Germany)
100mm (107x) STF2383 (CD): bei 64x als 8 mit Ost-West-Ausdehnung erkennbar - bei 107x knapp getrennt, beide Komponenten sind etwa gleich hell
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
Joerg S. Schlimmer
Germany
127mm (203x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Epsilon-Lyrae_ausschnitt_filtered.jpg
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.
Mark McCarthy
Fremont (California/USA)
80mm (13x) Zeta 2 Lyr. Slightly greenish-white stars. Best view in finder, cleaner. Wide, 1 delta mag.
Rene 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
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'' 121° 2018 Ser 18h45m28.36s +05°30'00.40"
Rene 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"
Rene 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.
Mark McCarthy
Fremont (California/USA)
508mm (533x) Light yellow and pale blue, wide, 2 delta mag.
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 (533x) White star and much fainter B, ~4" sep, four delta mag. B looks a little red, pale.
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 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.
Rene Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x sind die Komponenten A und B weit getrennt, B ist deutlich schwächer - zwei gleichhelle Fühlersterne (E und F) nördlich von Komponente A machen 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
Joerg S. Schlimmer
Germany
127mm (108x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung-beta-Lyrae_filtered_96dpi.jpg
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) ~1.5”, faint, 2 delta mag
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 blueish 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) Both orange, very well split, around 7”
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.
delta Lyr, 11/12 Lyr, delta Lyrae Cluster, Stephenson 1 H6 3, delta 1 Lyr 5m5 9m9 175.3'' 20° 2012 Lyr 18h53m43.56s +36°58'18.20"
ES2028, delta 2 Lyr AB 4m3 11m2 86.3'' 349° 2014
ES2028, delta 2 Lyr BC 11m2 11m6 2.1'' 135° 2008
SMR13, delta 2 Lyr AD 4m5 8m8 193.1'' 210° 2014
SMR13, delta 2 Lyr AE 4m5 10m3 400.6'' 238° 2014
SMR13, delta 2 Lyr AF 4m5 8m8 369.4'' 245° 2014
SMR13, delta 2 Lyr AG 4m5 9m8 335.9'' 261° 2014
SMR13, delta 2 Lyr AH 4m5 8m7 229.4'' 284° 2014
SMR13, delta 2 Lyr AJ 4m3 12m0 279.5'' 249° 2014
SMR13, delta 2 Lyr AK 4m3 12m0 304.2'' 236° 2014
SMR13, delta 2 Lyr HI 8m7 12m9 26.1'' 251° 2015
Joerg S. Schlimmer
Germany
305mm (94x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung-delta-Lyrae_filtered_96dpi.jpg
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.
SHJ282 AC 6m1 7m6 45.4'' 350° 2018 Lyr 18h54m52.52s +33°58'06.90"
Christopher Hay
Seeheim (Germany)
10x42 Stabilised binoculars, handheld. Wide split, the A component yellowish. Alias South 282. According to Stelledoppie a physical double.
Robert Zebahl
Leipzig (Germany)
70mm (22x) 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.
Christopher Hay
Seeheim (Germany)
125mm (23x) 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.
Mark McCarthy
Fremont (California/USA)
317mm (277x) Wide separation orange and blue, 2 delta mag.
Claus-Dieter Jahn
Leipzig (Germany)
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
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.
STT365 AB 7m2 8m3 0.2'' 359° 2016 Lyr 18h55m57.14s +44°13'41.90"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very fine, white and blue stars, ~4", 3 delta mag. Nice!
STF2417, theta Ser, 63 Ser, Alya AB 4m6 4m9 22.5'' 104° 2018 Ser 18h56m13.18s +04°12'12.90"
AC 4m6 6m8 421.0'' 58° 2007
Rene Merting
Drachhausen (Germany)
10x50 AB: zwei helle schneeweiße Sterne, knapp getrennt - B im Osten ist nur knapp schwächer - ein schönes enges Pärchen
Rene Merting
Drachhausen (Germany)
16x70 AB: ein gut getrennt zu sehendes Pärchen - beide Sterne stahlen weiß, Komponente B im Osten ist keine halbe Größenklasse schwächer
Rene 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
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.
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 0.5'' 2017 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.
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 39.4'' 210° 2019 Aql 19h04m57.67s -04°01'53.10"
Rene Merting
Drachhausen (Germany)
10x50 sehr auffälliges dicht zusammen stehendes Sternpaar - Komponente A im Norden ist hellgelb, B grau-orange, schöner Farbkontrast
Rene Merting
Drachhausen (Germany)
16x70 ein wunderschönes ordentlich getrenntes Sternpaar - Komponente A im NO samt gelb, 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.
Rene Merting
Drachhausen (Germany)
100mm (32x) bei 32x weit getrennt, Komponente A hellgelb, B dagegen orangefarben - sehenswert
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-blueish, companion slightly orange.
Rene 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"
Rene Merting
Drachhausen (Germany)
100mm (32x) 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) Yellow and yellow-orange, 1 delta mag, very wide.
★★ STF2457 7m5 9m5 10.2'' 201° 2015 Vul 19h07m08.02s +22°35'03.70"
Rene 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.
Mark McCarthy
Fremont (California/USA)
317mm (277x) White and orange, 1 delta mag wide.
STF2461, 17 Lyr AB 5m3 9m1 3.2'' 281° 2017 Lyr 19h07m25.58s +32°30'06.20"
Rene 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"
Rene 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.
★★ STF2474 AB 6m8 7m9 15.9'' 264° 2018 Lyr 19h09m04.35s +34°35'59.90"
Rene 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
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)
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, V338 Sge AB 7m1 8m0 0.6'' 136° 2017 Sge 19h12m34.45s +16°50'47.20"

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

Mark McCarthy
Fremont (California/USA)
203mm (667x) 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) getrennt, schwierig, 0,6"? ../projects/double-stars/frederik-wanink/sketches/BU139.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) V338 Sge. Overlapping airy disks.
★★ 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"
STF2505 AB 8m3 9m5 10.9'' 315° 2015 Lyr 19h19m52.83s +35°32'16.60"
Rene Merting
Drachhausen (Germany)
100mm (32x) 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) Orange and blue, looks like Alberio, but fainter. Wide separation.
★★ 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 34.6'' 54° 2019 Cyg 19h30m43.29s +27°57'34.90"
Robert Zebahl
Leipzig (Germany)
8x40 Well split, but I didn't recognised any color.
Rene 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
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!
Rene 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
Joerg S. Schlimmer
Germany
127mm (203x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Albireo_filtered_96dpi_127mm.jpg
Joerg S. Schlimmer
Germany
305mm (170x) alle Komponenten einfach zu trennen ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Albireo_filtered_96dpi_305mm.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.
★★★ HN 84 6m4 9m5 28.4'' 301° 2013 Sge 19h39m25.33s +16°34'16.00"
Rene 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.
Rene 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
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.
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"!]
★★ 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 AB 8m4 8m4 0.2'' 140° 2000 Aql 19h44m56.78s +10°46'30.60"
Mark McCarthy
Fremont (California/USA)
508mm (333x) 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) I can sense olive shape, very tough.
STF2579, delta Cyg, 18 Cyg AB 2m9 6m3 2.8'' 218° 2016 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'' 106° 2018 Aql 19h48m42.05s +11°48'57.30"
Stefan Loibl
Rosenheim (Germany)
102mm (205x) not fully split, seen as constricted '8'
Robert Zebahl
Leipzig (Germany)
120mm (337x) At 100x elongated, at 200x seen as '8'. At 337x split in moments of good seeing, but still very tight. Overall the seeing was not so good.
Mark McCarthy
Fremont (California/USA)
203mm (205x) Pi Aql. Pretty yellow-orange A and a little more than 1 delta mag pale blue B, ~1", yet neatly separated
Frederik Wanink
Itterbeck (Germany)
254mm (640x) Helligkeitsunterschied erkennbar ../projects/double-stars/frederik-wanink/sketches/STF2583.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) 52, Pi Aql. Very definite split. A mini Alberio, gold and blue.
STT387 7m1 7m9 0.4'' 105° 2018 Cyg 19h48m43.81s +35°18'41.30"

../images/binary-star-orbits/STT387-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) zeitweise als 8 zu sehen ../projects/double-stars/frederik-wanink/sketches/STT387.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Red, very close pair? Seeing not supporting higher magnification. Marginal.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Overlapping disks, to a nearly hairline split with seeing. Half delta mag.
★★ STF2606 AB 7m7 8m4 0.7'' 146° 2017 Cyg 19h58m32.66s +33°16'38.80"

../images/binary-star-orbits/STF2606-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) sehr schwierig, Luftunruhe ../projects/double-stars/frederik-wanink/sketches/STF2606.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Hair split to clean split when seeing stills and there is only an airy disk. Near equal, half a delta mag. ~0.8"
Mark McCarthy
Fremont (California/USA)
508mm (333x) Close pair 2 delta mag.
BU1133 6m7 9m9 1.1'' 342° 1991 Cyg 19h59m39.13s +31°49'35.40"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Tough find, dense field. Very temporary brightening in diffraction, 20% held. This is a tough one, <1" and large delta mag.
STT394 AB 7m1 10m3 11.0'' 294° 2015 Cyg 20h00m11.43s +36°24'50.80"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty orange and blue, well separated, 2 delta mag.
★★ SHJ314, V1676 Cyg AF 6m8 7m3 35.8'' 28° 2018 Cyg 20h05m57.32s +35°47'18.20"
AD 6m8 9m5 11.3'' 301° 2018
Rene Merting
Drachhausen (Germany)
100mm (32x) AD: bei 32x ist westlich von A knapp getrennt ein sehr schwacher Lichtpunkt erkennbar - mindestens 3 Größenklassen Helligkeitsunterschied zwischen A und D - zurück auf 20x sind beide Sterne auch noch ganz knapp getrennt erkennbar
AF: bei 32x sind zwei weit auseinander stehende Sterne erkennbar, Komponente F im NO ist nur unwesentlich schwächer und strahlt nicht ganz so klar wie A
Uwe Pilz
Leipzig (Germany)
105mm (144x) liegt gemeinsam mit SHJ 315 im OC NGC 6871. Die Zeichnung des gesamten Haufens enthält nur die hellsten Sterne. ../projects/double-stars/uwe-pilz/sketches/190726shj314_315.jpg
★★ STF2675, kappa Cep, 1 Cep AB 4m4 8m3 7.3'' 120° 2015 Cep 20h08m53.32s +77°42'40.90"
Robert Zebahl
Leipzig (Germany)
55mm (38x) At 27x faint companion not visible. At 38x and higher magnification the companion is quite easily visible as faint, tiny star. Very nice, uneven pair!
Mark McCarthy
Fremont (California/USA)
508mm (333x) Bright white and 3 delta mag light orange B, well split.
★★ AC17 AB 6m2 10m6 4.4'' 82° 2015 Cyg 20h12m31.73s +51°27'49.00"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wow. Pretty orange-yellow and much fainter 3-4 delta mag B, resolves into view with seeing, just appears then vanishes if seeing quavers. ~4".
★★ STFA50, omicron Cyg, 30 Cyg, 31 Cyg AD 3m9 4m8 336.7'' 322° 2016 Cyg 20h13m37.90s +46°44'28.80"
AC 3m9 7m0 108.6'' 173° 2016
Robert Zebahl
Leipzig (Germany)
naked eye AD: Well split with noticeable difference in brightness.
Robert Zebahl
Leipzig (Germany)
8x40 AD: Wonderful double star for binoculars. Large distance of the components, brighter once (31 Cyg) appeared slightly orange, the fainter (Cyg 30) more bluish.
Robert Zebahl
Leipzig (Germany)
8x40 AC: Observation at full moon. Easily split with big difference in brightness. Brighter component slightly orange. C component rather faint.
Rene Merting
Drachhausen (Germany)
18x70 wunderschön - Komponente A präsentiert sich buttergelb - die südliche, schwächste Komponente C zeigt sich aquamarinblau - D im Norden ist reinweiß und steht dreimal weitere entfernt wie AC
Robert Zebahl
Leipzig (Germany)
80mm (25x) AC: Similar to the observation with binoculars. C component appeared bluish and gave good contrast to the orange colored 31 Cyg.
Rene Merting
Drachhausen (Germany)
100mm (32x) bei 32x sind alle drei Sterne weit getrennt und doch irgendwie zusammengehörend, Komponente A hellgelb, Komponente D strahlt weiß und die schwächste Komponente C schimmert bläulich, schöner Anblick
Robert Zebahl
Leipzig (Germany)
102mm (28x) Bright, wide apart and wonderful contrast in color. A: light yellowish-orange, C: blue, D: light blue. ../projects/double-stars/robert-zebahl/sketches/2019-08-22_omicron_cyg.jpg
STF2653 6m7 9m2 2.7'' 279° 2016 Vul 20h13m40.56s +24°14'20.50"
Mark McCarthy
Fremont (California/USA)
203mm (667x) Pretty pair, pale white star and blue, very faint and small 3" separated B. Looks like a planet
STT403 AB 7m3 7m6 1.0'' 171° 2016 Cyg 20h14m21.53s +42°06'15.60"
Uwe Pilz
Leipzig (Germany)
105mm (288x) schwierig
Robert Zebahl
Leipzig (Germany)
152mm (270x) At 129x clearly elongated, notched. At 270x clearly split, but very tight with almost touching diffraction disks. Visible, but very small difference in brightness. Inconspicuous color.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwaches 3er System, getrennt ../projects/double-stars/frederik-wanink/sketches/STT403.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Dramatic near equal white, just split, ~1", with a third in the system 2x fainter and wide separation (Indeed a triple, as described.)
Mark McCarthy
Fremont (California/USA)
317mm (553x) Dramatic near equal white, just split, ~1", with a third in the system 2x fainter and wide separation (Indeed a triple, as described.)
BU442, SLV8, ABH135, SLE982 BU442 AB 9m7 8m0 18.7'' 103° 2015 Cyg 20h16m29.84s +37°38'35.40"
SLV8 AC 9m7 8m8 31.8'' 77° 2015
BU442 BC 8m0 8m8 16.8'' 49° 2015
ABH135 AD 9m7 12m6 24.5'' 50° 2015
ABH135 BE 8m0 12m9 50.0'' 88° 2015
ABH135 BF 8m0 12m5 64.2'' 140° 2015
SLE982 AG 9m7 10m6 88.5'' 10° 2015
SLE982 AH 9m7 13m5 111.5'' 20° 2008
SLE982 AI 9m7 13m5 63.3'' 44° 2015
SLE982 AJ 9m7 13m1 96.5'' 35° 2012
SLE982 AK 9m7 11m5 114.7'' 35° 2012
SLE982 AL 9m7 9m5 177.5'' 27° 2015
SLE982 AM 9m7 13m2 89.2'' 65° 2015
SLE982 AN 9m7 12m4 156.2'' 77° 2012
SLE982 AO 9m7 12m7 59.1'' 118° 2015
BU442 AP 9m7 10m8 4.1'' 156° 2016
BU442 AQ 9m7 13m1 8.7'' 157° 2015
BU442 AR 9m7 11m1 19.2'' 332° 2015
BU442 BS 8m0 14m5 3.7'' 124° 2016
BU442 BT 8m0 11m5 6.7'' 164° 2016
BU442 BU 8m0 11m5 25.4'' 74° 2015
BU442 BV 8m0 12m0 31.1'' 86° 2015
Rene Merting
Drachhausen (Germany)
100mm (32x) ein Zehnfachsternsystem mit drei Sternen zwischen 8 und 10 mag und weiteren 7 Sternen zwischen 11 und 15 mag
AB: - bei 32x und genauer Betrachtung zeigt sich im NW von B die Komponente A, die etwa eine halbe Größenklasse schwächer ist als C - bei 107x ist erkennbar, dass A einen kleinen Ticken weiter von B entfernt steht als C
BC: bei 32x sind B und C auffällig und schön anzusehen, C steht weit getrennt nordöstlich von B und ist eine knappe Magnitude schwächer
RST4659 AB 7m2 9m2 1.8'' 2015 Aql 20h16m50.26s -03°29'30.00"
Mark McCarthy
Fremont (California/USA)
317mm (553x) White and 2-3 delta mag, ~2” B.
BU441 AB 6m4 10m5 6.2'' 64° 2015 Vul 20h17m31.54s +29°08'51.00"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange star with very faint bluish B seen with averted vision at first then can just hold. Needs fine focus.
STF2666 AB 6m0 8m2 2.8'' 245° 2018 Cyg 20h18m06.99s +40°43'55.60"
Christopher Hay
Seeheim (Germany)
150mm (96x) Observed at zenith in late July 2019. Clean split, B a fine speck of light to the south of the much brighter primary. Very charming, the highlight of that night’s double-star observing. Struve 2666 A is a member and the lucida of open cluster Collinder 419.
Mark McCarthy
Fremont (California/USA)
317mm (553x) White A, slightly red B, ~2 delta mag, ~4"
★★ BU1206 7m5 10m7 2.2'' 355° 2016 Cyg 20h19m07.08s +36°45'07.60"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very much fainter B, ~2", 3-4 delta mag. Pinpoint when seeing stills.
STF2673 AB 8m3 9m8 2.4'' 326° 2016 Del 20h22m43.76s +13°20'25.40"
Rene Merting
Drachhausen (Germany)
100mm (142x) bei 107x wird Komponente B nordwestlich von A blickweise sichtbar, noch nicht ganz getrennt die beiden - 142x reicht dann aber, um B sauber von A zu trennen - Helligkeitsunterschied eine Größenklasse (1.5 Größenklassen laut Stelle Doppie)
Mark McCarthy
Fremont (California/USA)
317mm (553x) Faint but well-split, ~3 disk separation. B ~2 magnitudes fainter. A is blue-green, B reddish.
STF2681 AB 8m0 10m6 6.8'' 39° 2015 Cyg 20h22m49.54s +53°25'02.80"
Rene Merting
Drachhausen (Germany)
100mm (32x) bei 32x gut getrenntes Pärchen, Komponente A nördlich strahlt doppelt so hell wie B im Süden, auf C nicht geachtet
Mark McCarthy
Fremont (California/USA)
317mm (553x) Nice. 3x fainter B, ~4", another wide pair below. (4 stars in system.)
HO457 AB 9m1 9m2 2.0'' 61° 2018 Vul 20h24m21.08s +29°22'55.30"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Nice! quite a pair. Equal stars, well separated ~2", white stars. [AC 14th mag and wide not seen]
★★ HO131 AB 7m0 10m6 3.4'' 334° 2015 Del 20h28m18.64s +18°46'10.20"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Seeing needed to be perfectly still so that A's diffraction disappeared. Then B would emerge from the dark as a very faint point to the NW, about 3 disks away.
★★ WEI35 AB 8m3 8m8 4.0'' 214° 2018 Cyg 20h29m13.54s +37°30'45.80"
AC 8m3 9m4 87.6'' 100° 2015
CD 9m4 10m6 12.1'' 202° 2018
Rene Merting
Drachhausen (Germany)
100mm (64x) AB: bei 64x ist ein schön eng stehendes Paar zweier schwacher Sterne erkennbar - Komponente B im SW schwächelt helligkeitstechnisch nur um eine halbe Magnitude gegenüber A - Komponente A wirkt leicht farbig, das aber ist nicht greifbar
Uwe Pilz
Leipzig (Germany)
105mm (200x) eine anderer doppelter Doppelstern! Lohnend! Es ist erstaunlich, dass er nicht in den klassischen Katalogen auftaucht ../projects/double-stars/uwe-pilz/sketches/190726wei35.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Double-double! Near equal 3", and closeby a wider pair, 5", 1 delta mag. (AB is first, CD might be second? 4 stars visible in system)
BU63, 1 Del AB 6m2 8m0 0.9'' 347° 2016 Del 20h30m17.95s +10°53'45.30"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwierig ../projects/double-stars/frederik-wanink/sketches/1Del.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) 1 Delphini: 1 disk split to the NNW when seeing stills. A tough observation. 1 Del is a fascinating star that spins once in 0.9 earth days! See http://stars.astro.illinois.edu/sow/1del.html.
STF2695 6m6 8m8 0.4'' 259° 2016 Vul 20h31m58.19s +25°48'18.10"

../images/binary-star-orbits/STF2695-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Using 8" mask at 667x, no sign of elongation. With 20" and progressively higher magnifications, I can get to olive shape at 1067x, but extremely marginal. [0.8" at discovery, so easier for Struve]
STT408 6m8 9m4 1.6'' 193° 2009 Cyg 20h34m01.96s +34°40'44.40"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very fine dull white A and pinpoint B, split well with seeing, ~2”
A2793 9m9 10m3 0.9'' 210° 2016 Vul 20h36m29.63s +23°41'43.50"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Nice! very fine pair, white stars, half delta mag, close, ~1"
★★ ARY48 8m2 8m8 53.3'' 41° 2016 Cyg 20h37m45.00s +32°23'42.90"
Mark McCarthy
Fremont (California/USA)
80mm (13x) A beautiful split in finder, just equal pair, wide separation, white with red tint.
Rene Merting
Drachhausen (Germany)
100mm (20x) bei 32x zeigt sich B fast gleichhell weit getrennt nordöstlich von A - bei 20x ein kleines schwaches ordentlich getrenntes Pärchen
TDT2441 10m6 10m6 0.6'' 102° 1991 Vul 20h38m20.78s +21°05'37.50"
Mark McCarthy
Fremont (California/USA)
508mm (667x) Very difficult and faint B star appears with averted vision, only at the instant seeing settles the A star down to a clean round diffraction. B is a brown hard point on the diffraction ring. very tough.
STF2718 AB 8m3 8m4 8.6'' 88° 2015 Del 20h42m33.47s +12°43'41.90"
Rene Merting
Drachhausen (Germany)
100mm (32x) der Doppelstern steht sehenswert in einem Bogen aus 5 Sternen - bei 32x werden zwei gleich helle knapp getrennte Sterne sichtbar - schwer zu sagen, welches die A-Komponente ist - die westliche Komponente wirkt im Weiß-Farbton etwas kühler
Mark McCarthy
Fremont (California/USA)
317mm (553x) Same brightness white pair.
★★ 52 Cyg, STF2726 4m3 9m5 5.9'' 72° 2018 Cyg 20h45m39.76s +30°43'10.80"
Rene Merting
Drachhausen (Germany)
100mm (107x) bei 107x strahlt A gleißend und hellgelb, Komponente B ist östlich von A schön abgesetzt sehr schwach erkennbar - Helligkeitsunterschied riesig, bestimmt mehr als 4 Größenklassen (5.2 mag laut Stelle Doppie) - zurück auf 64x ist Komponente B nur in ruhigen Momenten zu erhaschen, der Stern klebt förmlich am hellen Strahlenkranz von A
Mark McCarthy
Fremont (California/USA)
317mm (277x) 52 Cygni: I sight this one by eye to find the Western Veil in the Telrad. Bright orange and 3 delta mag blue B, ~7”
★★ STF2725 AB 7m5 8m2 6.1'' 12° 2018 Del 20h46m13.31s +15°54'26.40"

../images/binary-star-orbits/STF2725-AB-orbit.jpg

Rene Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein schöner Kontrast zum 15' nördlich stehenden viel helleren Sternpaar STF2727 - hier bei dem wesentlich schwächeren Sternpaar zeigt sich bei 32x die Komponente B knapp getrennt nördlich von A - Helligkeitsunterschied etwas mehr als eine halbe Magnitude, aber Komponente A ist noch deutlich schwächer als die Komponente B von STF2727
Uwe Pilz
Leipzig (Germany)
105mm (66x) im selben Feld mit gamma Del
Uwe Pilz
Leipzig (Germany)
105mm (88x) ../projects/double-stars/uwe-pilz/sketches/191030gammaDel.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Near equal yellow-white stars, wide separation.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Super wide, 1 magnitude difference, both faint yellow-white.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Easy, half delta mag and wide. I was after the super close WSI 110 Aa-Ab 0.1" but had no hope of seeing it.
Berthold Fuchs
Wiesbaden (Germany)
130mm close DS ../projects/double-stars/berthold-fuchs/photographs/STF%202725.png
★★ STF2727, 12 Del, gamma Del AB 4m4 5m0 8.9'' 265° 2019 Del 20h46m39.50s +16°07'27.40"

../images/binary-star-orbits/STF2727-AB-orbit.jpg

Christopher Hay
Seeheim (Germany)
15x45 Stabilised binoculars, handheld. A very elongated figure-8 very close to popping apart. According to Stelledoppie a physical double with a period of 3249 years. Observed in June 2019 when separation was 8,89“. Will be 8.67“ in 2030 according to Stelledoppie.
Christopher Hay
Seeheim (Germany)
18x80 Very tight pair but clearly split with black in-between. Observed in July 2019 when separation was 8,89“. An excellent object to test the resolution of large binoculars. Struve 2725 a few arcminutes to the southwest is a further good test object for magnifications >20x.
Rene Merting
Drachhausen (Germany)
100mm (32x) bei 32x knapp getrennt - Komponente A ist schön gelb, B im Westen ist gut 1.5 Magnituden schwächer (lt. Stelle Doppie Helligkeitsunterschied nur 0.67 mag) - zusammen mit dem wesentlich schwächeren STF2525 gut 15' südlich sehenswert
Uwe Pilz
Leipzig (Germany)
105mm (66x) im selben Feld mit STF2725 ../projects/double-stars/uwe-pilz/sketches/gammaDel.jpg
Uwe Pilz
Leipzig (Germany)
105mm (144x) schon trennbar bei 26x. In einem Feld mit STF2725 ../projects/double-stars/uwe-pilz/sketches/191030gammaDel.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Gamma Delphinus. Rich gold-yellow A, blue-white B, ~6" separation estimated by eye. Very pretty pair.
STT413, 54 Cyg, lambda Cyg AB 4m7 6m3 0.9'' 2018 Cyg 20h47m24.53s +36°29'26.70"

../images/binary-star-orbits/STT413-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
102mm (280x) The diffraction disk of the primary component was slightly elongated towards north. The air here was however a bit too unsteady for an accurate observation.
Uwe Pilz
Leipzig (Germany)
105mm schwierig ../projects/double-stars/uwe-pilz/sketches/lambdaCyg.jpg
Robert Zebahl
Leipzig (Germany)
152mm (300x) The fainter component was visible as a permanent brightening of the first diffraction ring.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwierig aber getrennt ../projects/double-stars/frederik-wanink/sketches/LambdaCyg.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Lambda Cyg: ~1.5 delta mag, blue-white. Bright mess resolves to two disks 0.8-1.0”, with seeing.
★★ BU66 8m8 9m3 1.1'' 169° 2010 Vul 20h48m06.26s +27°27'25.30"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Exceedingly fine, elongated haze resolved to a clean split, half delta mag, with seeing. 1" Nice!
BU67 6m8 9m9 1.5'' 310° 2015 Cyg 20h50m36.05s +30°54'45.70"
Robert Zebahl
Leipzig (Germany)
152mm (270x) Not split.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pale blue A and 3 delta mag B, ~2”. In the middle of the Cygnus Loop.
STT420 6m7 10m5 5.5'' 2015 Cyg 20h54m22.25s +40°42'10.60"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Light yellow A and reddish B, very faint, very wide, 3 delta mag.
STT419 7m2 10m0 1.6'' 23° 2012 Cyg 20h54m42.00s +37°04'25.30"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Tough, needed to wait for a while for right seeing. Bright yellowish A with brightening in diffraction which stays put and recedes to a fine point momentarily with the seeing.
STF2735 6m5 7m5 2.0'' 282° 2015 Del 20h55m40.64s +04°31'57.70"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) Hauptstern leicht gelblich ../projects/double-stars/frederik-wanink/sketches/STF2735.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty orange and blue, Alberio-like, 2 delta mag, well split
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty gold and blue, close but well separated.
★★★ STF2742 7m4 7m6 2.9'' 215° 2017 Equ 21h02m12.51s +07°10'47.30"
Robert Zebahl
Leipzig (Germany)
70mm (57x) At 44x almost split with slight difference in brightness. At 57x split, but tight.
Rene Merting
Drachhausen (Germany)
100mm (64x) ähnlich wie STF2765 und STF2786 weiter nördlich wieder so ein knappes Pärchen bei 64x, das scheint Sternbild-typisch zu sein - beide Sterne sind fast gleich hell, der Stern im NO ist minimal heller
Uwe Pilz
Leipzig (Germany)
105mm (94x) Prachtstück! Weiß-Weißgelb. ../projects/double-stars/uwe-pilz/sketches/190930STF2742.jpg
Mark McCarthy
Fremont (California/USA)
203mm (533x) Lam Equ. Sky Tools says 1 delta mag but these are near equal, white, wide 3" separation.
Mark McCarthy
Fremont (California/USA)
317mm (553x) equal light orange, well split, pretty
Mark McCarthy
Fremont (California/USA)
317mm (553x) easy wide, equal brightness pair.
STF2747 8m4 8m7 4.6'' 267° 2018 Cyg 21h02m21.92s +37°39'14.00"
Rene Merting
Drachhausen (Germany)
100mm (64x) bei 32x ein leicht verformter Stern, nicht ganz rund - bei 64x zwei gleich helle ganz knapp getrennte weiße Lichtpünktchen, schick - bei 107x wird die Trennung deutlicher, der südöstliche Stern strahlt einen kleinen Tick heller
Mark McCarthy
Fremont (California/USA)
317mm (553x) Light orange near equal, ~5"
BU69 AB 8m3 9m8 0.4'' 2017 Vul 21h02m36.08s +21°41'28.20"

../images/binary-star-orbits/BU69-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) I sense overlapping disks at 553x, but marginal.
★★ BU445 AB 7m0 11m1 4.7'' 109° 2015 Cyg 21h03m29.53s +29°05'33.00"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange-red with exceptionally fainter B, only when seeing stills, else it is lost in the diffraction. Pinpoint. ~2”, 4 delta mag.
COU129 8m8 11m8 0.7'' 75° 2007 Vul 21h05m32.01s +24°33'51.10"
Mark McCarthy
Fremont (California/USA)
317mm (553x) I felt B flash momentarily with seeing, but marginal. Very tough one.
★★★ STF2758, 61 Cyg AB 5m2 6m0 31.6'' 154° 2018 Cyg 21h06m53.95s +38°44'57.90"

../images/binary-star-orbits/STF2758-AB-orbit.jpg

Christopher Hay
Seeheim (Germany)
15x45 Clear to wide separation. Both components of orange hue. Brighter northern component seemed to go slightly into yellow. In 10x42 also clearly split, northern component of orange hue, southern component of indeterminate colour (sky not quite dark enough at the time to see 61 Cyg naked-eye). Piazzi’s Flying Star, flying more than 5” per year to the northeast, and a true physical double with a period of 678 years.
Rene Merting
Drachhausen (Germany)
100mm (32x) bei 32x sind beide Sterne gut getrennt, Komponente A strahlt in einem schmutzig dunklem gelb, schwächere Komponente B leicht orange
Uwe Pilz
Leipzig (Germany)
105mm (200x) gelb und orange. Der weitere Stern im Bild ist TYC 3168-6781 ../projects/double-stars/uwe-pilz/sketches/191023_61Cygni.jpg
Uwe Pilz
Leipzig (Germany)
105mm (200x) TYC 3168-5901 kann dazu dienen, den sich ändernden Positionswinkel abzuschätzen. ../projects/double-stars/uwe-pilz/sketches/180901_61Cyg.jpg
Joerg S. Schlimmer
Germany
127mm (203x) Intensive Farbe ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_61_Cyg_filtered_96dpi.jpg
Mark McCarthy
Fremont (California/USA)
203mm (121x) 61 Cyg. Nice near equal wide orange pair, bright [18 stars in system -- if so should be an OC]
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/61%20Cygni.png
HU1309 AB 10m3 11m3 3.0'' 171° 2011 Cyg 21h10m10.16s +37°25'46.70"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Suspected at 121x, moved up to 205x to see the tremulous B star very faint next to A, very close, good view with seeing
HO151 9m7 10m0 1.6'' 17° 2016 Equ 21h10m55.45s +03°51'55.30"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very faint, hazy unresolved patch which, when the seeing stills, is pierced by two small pinpoints. Very firm, close but separated. Both stars bluish. Lies to the south of a brighter orange star.
STT431 AB 8m8 9m0 2.6'' 126° 2016 Cyg 21h11m30.87s +41°14'28.70"
Mark McCarthy
Fremont (California/USA)
203mm (205x) Near equal yellow-white stars ~3" or a little less, nice!
HO153 8m5 9m6 1.0'' 128° 2016 Cyg 21h17m39.56s +33°45'29.80"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Faint, split with seeing, 1" 1 delta mag.
STF2786 7m5 8m2 2.8'' 189° 2016 Equ 21h19m39.36s +09°31'30.30"
Robert Zebahl
Leipzig (Germany)
70mm (57x) At 44x elongated, slightly notched. At 57x barely split with visible, but little difference in brightness.
Rene Merting
Drachhausen (Germany)
100mm (64x) bei 64x sind beide Komponenten ganz knapp getrennt erkennbar - Komponente A im Norden ist etwas heller als B
Uwe Pilz
Leipzig (Germany)
105mm (144x) ../projects/double-stars/uwe-pilz/sketches/190930STF2786.jpg
Mark McCarthy
Fremont (California/USA)
203mm (533x) Sharp white and B is about 1 delta mag and duller, almost bluish.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pale yellow stars, B a slightly darker tint though 1 delta mag dimmer, well split
Mark McCarthy
Fremont (California/USA)
317mm (553x) Easy. near equal white.
★★ STF2789 AB 7m7 7m9 6.8'' 115° 2018 Cyg 21h19m58.84s +52°58'44.10"
Robert Zebahl
Leipzig (Germany)
70mm (44x) At 22x almost separated. The double star appeared strikingly orange and forms a conspicuous, nearly isosceles triangle with neighbouring stars. At 44x clearly separated, relatively close together with a small difference in brightness. ../projects/double-stars/robert-zebahl/sketches/2019-07-28_stf2789.jpg
Rene Merting
Drachhausen (Germany)
100mm (32x) bei 32x zwei gleichhelle ganz dicht beieinander stehende weiße Lichtpünktchen, ganz knapp getrennt - wunderschön mit dieser Teleskopöffnung
STFB11, 1 Peg AB 4m2 9m3 36.3'' 312° 2019 Peg 21h22m05.13s +19°48'15.70"

../images/binary-star-orbits/STFB11-AB-orbit-solution-1.jpg ../images/binary-star-orbits/STFB11-AB-orbit-solution-2.jpg ../images/binary-star-orbits/STFB11-AB-orbit-solution-3.jpg

Uwe Pilz
Leipzig (Germany)
105mm (88x) der helle Stern ist weiß. ../projects/double-stars/uwe-pilz/sketches/191014_1Peg.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) 1 Peg: Easy yellow-orange & wide separated B
A1892 8m2 9m3 0.8'' 351° 2016 Cyg 21h23m40.12s +55°17'38.70"
Mark McCarthy
Fremont (California/USA)
317mm (553x) When seeing stills disk resolves with pin point <1" split, very fine. 1 delta mag.
★★ B1008 AB 8m9 8m1 0.1'' 226° 2018 PsA 21h30m57.70s -36°32'49.70"

../images/binary-star-orbits/B1008-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
317mm (553x) Propus (means "forefoot") = Eta Geminorum: So cool! Bright orange star with B very close, ~1.5", just preceding, ~3 delta mag. B is in diffraction but is well separated & has its own airy disk, bluish white.
★★ HO603 AB 7m5 9m8 80.6'' 251° 2015 Cyg 21h32m04.61s +34°12'06.10"
BC 9m8 11m3 3.6'' 276° 2015
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Orange and very wide separation bluish B
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Very wide 2 delta mag, but B has a fainter close pair to it, seen with averted vision, about 3” separation (this is BC).
Mark McCarthy
Fremont (California/USA)
317mm (553x) BC: B star to HO603AB has a fainter close pair to it, seen with averted vision, about 3” separation.
STF2804 AB 7m7 8m0 3.7'' 2018 Peg 21h32m58.30s +20°42'44.50"

../images/binary-star-orbits/STF2804-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (57x) Clearly split, pretty close, moderately uneven. The primary components looked slightly orange. Very nice pair.
Uwe Pilz
Leipzig (Germany)
105mm (88x) der südliche Stern ist einen Hauch heller. Gelb und orange. ../projects/double-stars/uwe-pilz/sketches/191014_STF2804.jpg
Mark McCarthy
Fremont (California/USA)
203mm (533x) Nice light orange and light blue, sharp, 1 delta mag 3". pretty.
STF2816 AC 5m7 7m5 11.8'' 121° 2018 Cep 21h38m57.61s +57°29'20.50"
AD 5m7 7m5 20.6'' 339° 2018
Uwe Pilz
Leipzig (Germany)
105mm (200x) gehört zu einem Sternentstehungsgebiet ../projects/double-stars/uwe-pilz/sketches/stf2816.jpg
mu Cyg, 78 Cyg, STF2822 AB 4m8 6m2 1.6'' 321° 2018 Cyg 21h44m08.57s +28°44'33.40"

../images/binary-star-orbits/STF2822-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
60mm (198x) Aufhellung innerhalb des ersten Rings
Robert Zebahl
Leipzig (Germany)
70mm (128x) At 128x I was able to see this double at least elongated.
Robert Zebahl
Leipzig (Germany)
200mm (171x) Quite well split with noticeable fainter component.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF2822.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow and light orange pair, ~1", 1 delta mag. Very pretty, subtle colors
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow, 1 delta mag, 2-3”
STF2840 AB 5m6 6m4 18.1'' 197° 2018 Cep 21h52m01.02s +55°47'48.30"
Robert Zebahl
Leipzig (Germany)
55mm (25x) Striking double star with clear distance and difference in brightness.
Robert Zebahl
Leipzig (Germany)
70mm (22x) Striking, beautiful double star with visible difference in brightness. At 44x A appeared rather yellowish, B slightly blueish, whereby the colors were difficult to detect.
Rene Merting
Drachhausen (Germany)
100mm (20x) bei 32x ein gut getrenntes Pärchen - Komponente B im Süden ist knapp eine Größenklasse schwächer - Komponente A wirkt weiß-gelblich, B eher gräulich - zurück auf 20x ist das Pärchen auch noch sehr ansehnlich, beide Sterne stehen schön dicht zusammen, die Trennung ist deutlich
★★ STF2841 A-BC 6m5 8m0 22.4'' 110° 2018 Peg 21h54m17.44s +19°43'05.30"
Robert Zebahl
Leipzig (Germany)
70mm (22x) At 22x easy to separate with considerable difference in brightness. The primary component appeared slightly yellowish-orange, the fainter component greyish-blue. The slight color contrast was especially visible at 44x.
Uwe Pilz
Leipzig (Germany)
105mm (88x) ../projects/double-stars/uwe-pilz/sketches/191014_STF2841.jpg
Mark McCarthy
Fremont (California/USA)
203mm (533x) Very wide 2 delta mag pair, white and light blue [COU 432 is the AB, 0.1" near equal, was 0.2" at discovery!]
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange & blue, very wide separation, ~2 magnitude difference.
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/STF2841.png
HO173 10m3 10m6 0.9'' 73° 2016 Peg 21h55m17.17s +18°43'11.70"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Very fine pair, almost one delta mag, very close but nicely split, <1", quite a sight
A303 AB 9m2 11m6 2.3'' 52° 2016 Peg 21h55m29.91s +27°23'35.60"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Slightly orange A star and very faint blue B, ~4", just seen direct vision. Very nice.
STT452 9m0 9m6 0.8'' 177° 2016 Peg 21h55m40.01s +07°15'13.90"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Noticed split immediately, white stars, half delta mag, very cool split
A304 AB 9m5 9m3 0.6'' 131° 2015 Peg 21h58m30.37s +27°24'34.60"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Most definite clean split of one delta mag stars, very nice disks
STF2850 7m0 11m0 2.8'' 264° 1983 Peg 21h59m49.60s +23°56'27.40"
Mark McCarthy
Fremont (California/USA)
508mm (533x) OU Peg. Very beautiful pair, rich orange and blue, well separated, four or five delta mag.
HO610 AB 10m1 10m2 0.6'' 241° 2016 Peg 22h02m00.73s +26°50'46.60"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Superfine, split nicely, ~0.7", half delta mag. [three other wider >12th mag pairs not seen]
BU694, V1942 Cyg AB 5m7 7m8 1.0'' 2016 Cyg 22h02m56.68s +44°38'59.80"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwieriger, Seeing schlecht ../projects/double-stars/frederik-wanink/sketches/BU694.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) 2 delta mag, just resolves, 1"
COU136 9m2 7m6 0.4'' 19° 2015 Peg 22h10m02.22s +23°07'33.00"

../images/binary-star-orbits/COU136-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (1067x) Awesome hairline at 533x, nice clean split at 1067x. The stars are split the diffraction patters merge at the boarders, perfect images. Appears more near equal than SkyTools data suggests
COU138 11m4 11m9 1.5'' 37° 2015 Peg 22h15m16.25s +23°53'39.50"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Wonderful faint pair, ~2" and two delta mag, very fine. Almost need averted vision but not quite.
HU383 9m9 10m1 0.4'' 27° 2011 Peg 22h19m36.43s +21°07'00.60"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Suspected split with 533x, but no question of split at 1067x, very nice split near equal stars
HO292 7m7 11m2 3.9'' 65° 2000 Peg 22h23m15.11s +05°38'47.80"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Extremely faint B, ~2", PA to north, seen with Averted vision only
delta Cep, STFA58 AC 4m2 6m1 41.0'' 191° 2018 Cep 22h29m10.25s +58°24'54.70"
Robert Zebahl
Leipzig (Germany)
55mm (27x) At 27x easy to separate, rather wide apart with clear difference in brightness. At 38x the colors are slightly better visible: A shines in bright orange, B appears rather grey-blueish.
Robert Zebahl
Leipzig (Germany)
80mm (25x) Obvious difference in brightness and color. Brighter component slightly orange, weaker bluish. Could be Albireo's little brother ;)
HO475 AB 9m3 9m6 1.1'' 306° 2016 Peg 22h32m45.51s +26°24'32.70"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Great! two plus one it must be. Tight near equal very well split, ~1", and another star about 1.5 fainter, rather wide about ten (AC)
HU982 7m8 9m4 0.6'' 219° 2008 Peg 22h35m12.10s +14°36'37.90"
Mark McCarthy
Fremont (California/USA)
508mm (1067x) Persistent elongation at 533x and with barlow at 1067x. No resolution through, maybe an instant of notching
8 Lac CHR112 Aa-Ab 5m7 0.0'' 131° 2018 Lac 22h35m52.28s +39°38'03.60"
STF2922 AB 5m7 6m3 22.3'' 186° 2018
A1469 AC 5m7 10m4 48.8'' 168° 2016
A1469 AD 5m7 9m1 81.6'' 145° 2017
A1469 AE 5m7 7m2 335.2'' 239° 2016
DAL28 AG 5m7 14m1 77.6'' 193° 2015
COM8 BF 6m3 11m0 127.6'' 175° 2012
A1469 DI 9m1 13m3 10.0'' 227° 2015
DAL28 GJ 14m1 13m0 6.5'' 78° 2016

../images/binary-star-orbits/CHR112-Aa-Ab-orbit.jpg

Rene Merting
Drachhausen (Germany)
100mm (32x) STF2922 (AB): AB: bei 32x sind beide Komponenten gut getrennt sichtbar - B im Süden ist eine halbe Größenklasse schwächer
BC: bei 32x schimmert südöstlich von der Komponente B ein ganz schwacher Lichtpunkt, die Komponente C, durch - Komponenten BC mit gleichem Abstand wie AB
nachrichtlich zu D: interessant ist das Mehrfachsystem allemal, denn in doppelter Entfernung weiter südöstlich steht eine vierte Komponente D (eigene Bezeichnung: A1469, D mit Helligkeit 9.08 mag), so dass 4 Sterne problemlos mit dieser Öffnung zu erfassen sind
BU1092 AB 8m3 8m3 0.4'' 223° 2016 Cep 22h36m08.65s +72°52'51.10"

../images/binary-star-orbits/BU1092-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (667x) Notched! Near equal. With seeing.
HO294 8m2 11m0 1.9'' 59° 2015 Peg 22h37m35.20s +27°26'22.80"
Mark McCarthy
Fremont (California/USA)
508mm (533x) When I first viewed the seeing was very rough, but after a couple of minutes it settled down so I could see a beautiful orange-yellow star resolved with a very faint reddish B ~3", nice hard points
★★ HO296 AB 6m1 7m2 0.4'' 40° 2018 Peg 22h40m52.71s +14°32'57.50"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Snowman. Light orange. Very tough
HU985 9m6 9m9 0.7'' 134° 2016 Peg 22h47m54.00s +12°58'36.20"

../images/binary-star-orbits/HU985-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (533x) Wow I got it! Light orange star and a very faint star just outside first diffraction, very subtle and tough
TDT3763 10m4 11m8 1.7'' 13° 2017 Peg 22h52m24.77s +28°18'54.90"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Cool! B just shows itself with seeing ~1.5" separation. Can tell its there, even with some smearing it does resolve to a point
BU180 AB 8m0 9m2 0.5'' 134° 2016 Cep 23h07m09.99s +60°49'57.10"

../images/binary-star-orbits/BU180-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
508mm (667x) Exceedingly fine split at best moments, hairline, 1 delta mag.
★★ BVD142 AB 7m8 10m3 80.0'' 165° 2018 And 23h10m29.28s +41°19'18.70"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange stars, 1 delta mag, well separated (finder split). B looks suspiciously like a pair -- but the transparency may be causing it to smear. This is quite an amazing catch considering the conditions! AB is as described 7.80/10.28 79.6". B is indeed a pair: TDT 3916 = BaBb, 10.69/11.41 0.6". Discovered in 1991 and only one observation!
★★★ TDT3916 Ba-Bb 10m7 11m4 0.6'' 89° 1991 And 23h10m31.15s +41°18'02.00"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange stars, 1 delta mag, well separated (finder split). B looks suspiciously like a pair -- but the transparency may be causing it to smear. This is quite an amazing catch considering the conditions! AB is as described 7.80/10.28 79.6". B is indeed a pair: TDT 3916 = BaBb, 10.69/11.41 0.6". Discovered in 1991 and only one observation!
STFB12, 91 Aqr A-BC 4m4 9m9 48.9'' 312° 2014 Aqr 23h15m53.50s -09°05'15.90"
Christopher Hay
Seeheim (Germany)
200mm (170x) According to Stelledoppie A and BC are a physical double, and B and C are in turn a tight physical double, hence a true triple system at a distance of 150 light years. A smaller aperture suffices to separate A-BC, but with 8 inches the fine colour contrast of A to BC presents nicely and the double dominates the 0.3° FOV. Very nice, for A is lemon-yellow, BC brick-red.
★★ STF2995 8m2 8m6 5.4'' 32° 2015 Psc 23h16m35.24s -01°35'11.40"
Rene Merting
Drachhausen (Germany)
100mm (64x) der Doppelstern liegt innerhalb des sehenswerten Sternmusters Posey 1 (Rocketship) - bei 64x ist Komponente B im Osten getrennt erkennbar - A ist nur unwesentlich heller, vielleicht eine viertel Magnitude
HEI89 10m5 10m8 1.2'' 68° 2015 Peg 23h21m23.99s +16°22'00.40"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Very fine pair, very pretty not really that equal magnitude, ~2"
★★ STF3012 AB 9m5 9m8 2.9'' 190° 2016 Peg 23h27m33.16s +16°37'22.90"
Mark McCarthy
Fremont (California/USA)
317mm (553x) near equal brightness ~3" separation. Double double with STF 3021
★★ STF3021 AB 8m1 9m3 8.7'' 308° 2017 Peg 23h31m24.65s +16°13'07.60"
Rene Merting
Drachhausen (Germany)
100mm (32x) bei 32x zeigt sich B ganz knapp getrennt nordwestlich von A - Helligkeitsunterschied gut 2 Größenklassen - der Doppelstern bildet mit drei helleren Sternen eine flache Drachenraute
Mark McCarthy
Fremont (California/USA)
317mm (553x) ~3.5" and ~1 delta mag. Double double with STF 3012
Mark McCarthy
Fremont (California/USA)
508mm (533x) Yellow and blue, two delta mag, wide
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/STF3021.png
TDT4190 10m2 10m3 0.6'' 34° 2010 Peg 23h46m58.42s +17°25'51.20"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Amazing I got the split at 533x only, clean split, near equal, light orange stars.
BU995 6m1 8m7 0.8'' 250° 2009 And 23h47m33.04s +46°49'57.20"
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very fine 4 delta mag, <0.8"
HEI91 10m1 11m9 0.7'' 153° 2010 Peg 23h48m38.11s +16°21'36.40"
Mark McCarthy
Fremont (California/USA)
508mm (533x) Wow B star emerges with perfect seeing only, just within where A's diffraction ring was -- seeing needs to be so good the ring all but disappears, otherwise the ring would hide it. Great
STF3049, sigma Cas, 8 Cas AB 5m0 7m2 3.1'' 326° 2017 Cas 23h59m00.53s +55°45'17.80"
AC 5m0 10m4 106.0'' 66° 2014
Robert Zebahl
Leipzig (Germany)
70mm (120x) AB: At 57x barely separated, where the B component appears as a faint tiny star. At 120x the B component is clearly visible and slightly elongated on the first diffraction ring of the primary component. Very fine. ../projects/double-stars/robert-zebahl/sketches/2019-08-25_sigma_cas.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) AB: Begleiter gerade außerhalb des Beugungsrings
Mark McCarthy
Fremont (California/USA)
317mm (277x) AB: White A to slight yellow B, 3-4", 1.5 delta mag.
STF3050 AB 6m5 6m7 2.5'' 342° 2018 And 23h59m29.33s +33°43'26.90"

../images/binary-star-orbits/STF3050-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
55mm (83x) At 83x seen as '8'. From 100x to 166x seen as '8', temporarily visible with space between.
Robert Zebahl
Leipzig (Germany)
70mm (100x) Wonderful double star. Easy to split with slight difference in brightness.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) einfaches Paar, gleich hell ../projects/double-stars/frederik-wanink/sketches/STF3050.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Nice near equal yellow-white, ~3"