Double Stars - Sketches

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 351
Visual Observations 1370
Sketches 464
Photographs 50
Observers 17
Werner E. Celnik, Berthold Fuchs, Sarah Gebauer, Christopher Hay, Claus-Dieter Jahn, Gerd Kohler, Karsten Kopp, Winfried Kräling, Jens Leich, Stefan Loibl, Mark McCarthy, René Merting, Uwe Pilz, John Raymond, Jörg S. Schlimmer, Frederik Wanink, Robert Zebahl
m1 m2 ρ θ Year Coordinates (J2000)
★★★ STTA254, WZ Cas AB 7m4 8m3 57.8'' 89° 2018 Cas 00h01m15.85s +60°21'19.00"
AC 7m4 9m6 155.4'' 324° 2015
AD 7m4 10m3 181.4'' 118° 2016
Christopher Hay
Seeheim (Germany)
6x24 AB: Clearly split. A definitely brighter than B. Under a NELM 5m5 sky both components appear weak in these mini-binoculars and no colour impression arises.;
WZ Cas is the variable designation of component A of STTA254. This semiregular carbon star has a mean brightness range of 6m8 to 7m7, and can reach extreme values of 6m3 at one end and 8m8 at the other. Perhaps it was too deep in a minimum at the time of observation to show colour with 1 inch of aperture? 15x45 binoculars revealed colour in this night, see observation below.
Christopher Hay
Seeheim (Germany)
15x45 AB: Wide split. A orange-red, B no particular colour. NELM 5m5, same night as 6x24 observation above.
Robert Zebahl
Leipzig (Germany)
16x70 AB: 2020-08-19: Intense orange & bluish. Very striking.
René Merting
Drachhausen (Germany)
16x70 AB: ein schöner Fernglas-Doppelstern - Komponente A im Westen präsentiert sich dunkelgelb (noch nicht orange), B im Osten ist eher weißlich
René Merting
Drachhausen (Germany)
18x70 AB: ein sehr auffälliger Doppelstern mit einem schönen Farbkontrast - A strahlt gelb, das kurz davor steht, ins Orange über zu gleiten - B wirkt im Kontrast aquamarin, so dezent wie eine typische PN-Farbe
Robert Zebahl
Leipzig (Germany)
80mm (33x) AB: Nice double star. Brighter component appeared orange, the fainter more bluish.
René Merting
Drachhausen (Germany)
100mm (20x) AB: 20x reicht zwar schon für eine klare Trennung, aber Komponente B im Osten ist nur dumpf grau-blau und noch zu schwach für den schönen Farbkontrast, der sich bei 32x offenbart - Komponente A strahlt dann in einem satten Bernsteingelb, B im Osten gibt sich unterkühlt bläulich - Helligkeitsunterschied 1 bis 1.5 Größenklassen, schwierig abschätzbar wegen der Farben
Robert Zebahl
Leipzig (Germany)
102mm (28x) AB: Splendid view. Primary component clearly orange, secondary blue. ../projects/double-stars/robert-zebahl/sketches/2019-08-22_wz_cas.jpg
Jörg S. Schlimmer
Germany
127mm (136x) Sehr schöner Farbkontrast ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_WZ_Cas_filtered_96dpi.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: WZ Cas: Pretty, deep orange A and very wide half delta mag B, white.
René Merting
Drachhausen (Germany)
320mm (45x) AB: bei 45x ein weit getrenntes Pärchen mit wunderschönen Farbkontrast, Komponente A im Westen ist grell-orange und die gut 1.5 Magnituden schwächere Komponente B ist aquamarin-grau
Robert Zebahl
Leipzig (Germany)
102mm ../projects/double-stars/robert-zebahl/photographs/2019-07-16_wz_cas.jpg
STF3056 AB 7m7 8m1 0.7'' 143° 2018 And 00h04m40.09s +34°15'54.70"
AB-C 7m1 10m1 26.3'' 2017
AB-D 7m1 10m6 95.3'' 238° 2012
CD 10m1 10m6 113.1'' 227° 2015

../images/binary-star-orbits/STF3056-AB-orbit.jpg

René Merting
Drachhausen (Germany)
76mm (29x) AB-C: bei 29x ist nach Norden eine ganz schwache Komponente erkennbar, gut getrennt - AB wirkt leicht gelblich, C eher kupfergrau
Sarah Gebauer
Germany
100mm (73x) die Komponenten AB erscheinen als ein Stern, C liegt nördlich davon und ist wesentlich schwächer und Komponente D, die ähnlich hell wie C erscheint, liegt westlich von AB gesehen ../projects/double-stars/sarah-gebauer/sketches/STF%203056.jpg
STT547 AB 9m0 9m2 6.0'' 190° 2020 And 00h05m41.03s +45°48'43.30"

../images/binary-star-orbits/STT547-AB-orbit-solution-1.jpg ../images/binary-star-orbits/STT547-AB-orbit-solution-2.jpg

René Merting
Drachhausen (Germany)
100mm (32x) bei 64x klare Trennung - ein relativ schwaches Pärchen - zurück auf 32x stehen beide dichter zusammen und können knapp getrennt werden
Uwe Pilz
Leipzig (Germany)
105mm (144x) Der nahe gelegene ß997 konnte nicht getrennt werden ../projects/double-stars/uwe-pilz/sketches/191123stt547.jpg
STF3062, V640 Cas 6m4 7m3 1.5'' 2020 Cas 00h06m15.81s +58°26'12.50"

../images/binary-star-orbits/STF3062-orbit.jpg

Robert Zebahl
Leipzig (Germany)
152mm (129x) Nice view, clearly split, but tight with visible difference in brightness.
Frederik Wanink
Itterbeck (Germany)
254mm (460x) leicht ../projects/double-stars/frederik-wanink/sketches/STF3062.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Light yellow and a more orange yellow B, 3-4", 1 delta mag. PC (70.07 L.Y.)
René Merting
Drachhausen (Germany)
320mm (320x) erst bei 320x ist Komponente B knapp getrennt nördlich von A zu erkennen - beide Sterne sind relativ hell und haben relativ große Beugungsscheibchen, so dass die Trennung nur knapp zu sehen ist - nicht wirklich schön, wenn man in den Nächten vorher mit einem Refraktor Doppelsterne beobachtet hat
STF2 6m7 6m9 0.9'' 15° 2019 Cep 00h09m20.18s +79°42'52.40"

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

Uwe Pilz
Leipzig (Germany)
105mm (198x) Schneemann-Figur. Abstand 0“91 ../projects/double-stars/uwe-pilz/sketches/STF2.jpg
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF2.jpg
STF3 7m8 9m1 5.0'' 82° 2020 And 00h10m03.18s +46°23'25.10"
René Merting
Drachhausen (Germany)
100mm (64x) bei 32x zeigt sich der Stern leicht länglich nach Osten verzogen - bei 64x knappe Trennung, Komponente B ist eine knappe Magnitude schwächer - A weiß, B grau-orange
Uwe Pilz
Leipzig (Germany)
105mm (200x) ../projects/double-stars/uwe-pilz/sketches/191123stf3.jpg
AC1 7m3 8m3 1.9'' 291° 2020 And 00h20m54.10s +32°58'40.90"

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

Robert Zebahl
Leipzig (Germany)
102mm (125x) Very attractive, relatively close with a clearly visible difference in brightness. In the immediate vicinity a brighter star shines in a lovely orange. Very nice contrast! ../projects/double-stars/robert-zebahl/sketches/2019-10-22_ac1.jpg
Uwe Pilz
Leipzig (Germany)
105mm (200x) orange. Leuchtend gelber Stern in 5' Abstand ../projects/double-stars/uwe-pilz/sketches/191122AC1.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Tight yellow-white pair, near equal magnitudes.
HJ5451 6m0 9m3 55.3'' 86° 2012 And 00h31m25.64s +33°34'53.90"
Uwe Pilz
Leipzig (Germany)
105mm (88x) gelbweiß, schon bei 21x erkennbar ../projects/double-stars/uwe-pilz/sketches/191122h5451.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange, pretty bright star, bluish / fainter widely separated B
H5 17, pi And, 29 And AB 4m4 7m1 36.2'' 175° 2019 And 00h36m52.84s +33°43'09.70"
AC 4m4 13m0 55.1'' 355° 2013
Robert Zebahl
Leipzig (Germany)
8x44 AB: 2020-11-25: Not separable. The faint companion was probably outshone by the bright primary component.
Robert Zebahl
Leipzig (Germany)
102mm (28x) AB: 2020-11-02: Quite large separation and large difference in brightness. A: white-yellowish, B: slightly bluish.
Uwe Pilz
Leipzig (Germany)
105mm (88x) AB: (HV 17) blauweiß und violett-grau ../projects/double-stars/uwe-pilz/sketches/191122HV17.jpg
HJ1986 AB 8m0 8m5 40.3'' 67° 2018 Cep 00h39m35.16s +84°44'52.00"
AC 8m0 11m2 55.8'' 189° 2015
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x sehr weit getrenntes Pärchen - beide Komponenten ähnlich hell, Komponente A im SW weiß, B eine halbe Größenklasse schwächer und mehr gräulich - zurück auf 20x sind beide weiterhin weit getrennt erkennbar
Sarah Gebauer
Germany
100mm (45x) bei 45x und 1,8° GF in der Nähe des OS NGC 188 getrennt zu sehen, das Trio bildet ein spitzes, langes Dreieck ../projects/double-stars/sarah-gebauer/sketches/HJ%201986.jpg
René Merting
Drachhausen (Germany)
320mm (45x) AB: bei 45x sehr einfach - Komponente B im NO ist maximal eine halbe Größenklasse schwächer - Komponente A weißorange
AC: bei 45x zeigt sich C im Süden von A als ganz schwaches Lichtpünktchen - Abstand zu A etwas größer als der von AB - alle drei Sterne zusammen bilden ein flaches Dreieck, A ist die Spitze mit dem flachen Winkel
STFA1 AB 7m2 7m4 47.8'' 47° 2018 And 00h46m24.34s +30°56'33.50"
Robert Zebahl
Leipzig (Germany)
8x40 Large distance with visible difference in brightness. I used a tripod.
Uwe Pilz
Leipzig (Germany)
105mm (26x) zweiter Doppelstern im Bild (ohne Bezeichnung). Gelb und orange. ../projects/double-stars/uwe-pilz/sketches/190922STTI1.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) equal magnitude orange pair, wide.
H5 82 AB 8m0 8m3 56.8'' 75° 2018 Cas 00h47m24.62s +51°05'45.90"
René Merting
Drachhausen (Germany)
12x50 ein ansehnliches Sternpaar, in der unmittelbaren Umgebung gibt es keine konkurrierenden Sterne - beide Komponenten stehen dicht zusammen und sind etwa gleich hell
Uwe Pilz
Leipzig (Germany)
16x70 ../projects/double-stars/uwe-pilz/sketches/200918HV82.jpg
René Merting
Drachhausen (Germany)
18x70 zwei annähernd gleich helle Sterne ziemlich weit auseinander stehend - B im Osten ist nur leicht schwächer
Robert Zebahl
Leipzig (Germany)
70mm (26x) Almost equally bright components with large angular distance.
★★★ eta Cas, 24 Cas STF60 AB 3m5 7m4 13.4'' 326° 2019 Cas 00h49m06.29s +57°48'54.70"
STF60 AC 3m5 11m4 225.0'' 260° 2000
STF60 AD 3m5 12m8 189.4'' 354° 2011
STF60 AE 3m5 10m2 75.6'' 126° 2015
STF60 AF 3m5 11m5 378.3'' 276° 2000
STF60 AG 3m5 9m5 419.7'' 259° 2012
STF60 AH 3m5 8m4 701.1'' 355° 2012
SMR2 AI 3m5 11m6 90.3'' 73° 2012
SMR2 AJ 3m5 12m3 237.1'' 262° 2012

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

Robert Zebahl
Leipzig (Germany)
70mm (57x) AB: Easy to split with big difference in brightness. Fainter component appeared deep orange to slightly red colored, brighter component tends to be more slightly yellowish.
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x ist Komponente A so hell, dass B trotz des augenscheinlich großen Abstandes von 13,4" nur knapp getrennt zu sehen ist - Komponente A ist gleißend hell-gelb, B dürfte mindestens 3 Größenklassen schwächer sein und wirkt dadurch dumpfer
Uwe Pilz
Leipzig (Germany)
105mm (53x) AB: leicht
Uwe Pilz
Leipzig (Germany)
105mm (288x) kein Sternentstehungsgebiet! ../projects/double-stars/uwe-pilz/sketches/etaCas.jpg
Sarah Gebauer
Germany
150mm (54x) AB: bei 54x erst nur einen Stern gesehen, doch da, ganz schwach darunter doch die wesentlich schwächere, zweite Komponente entdeckt ../projects/double-stars/sarah-gebauer/sketches/20200731%20Eta%20Cas%20DSk.jpg
Winfried Kräling
Marburg (Germany)
152mm (175x) ../projects/double-stars/winfried-kraeling/sketches/2021-07-23-2055UT-Eta%20Cassiopaia.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Nice yellow pair. A is a red tainted yellow, B is cleaner.
René Merting
Drachhausen (Germany)
320mm (72x) AB: bei 72x ein echt fetter Farbkontrast, Komponente A ist gleißend hell und zitronengelb, B zeigt sich knallig orange - beide Sterne sind gut getrennt voneinander zu beobachten - sehenswert
★★ STF73, 36 And AB 6m1 6m5 1.2'' 338° 2019 And 00h54m58.02s +23°37'42.40"
Sarah Gebauer
Germany
100mm (136x) beide Sterne tanzen wild umeinander herum, blickweise ist er kurz getrennt
Robert Zebahl
Leipzig (Germany)
102mm (125x) Clearly visible as figure '8' with a rather small difference in brightness.
Uwe Pilz
Leipzig (Germany)
105mm (198x) ganz einfach
Uwe Pilz
Leipzig (Germany)
105mm (240x) gelb und weiß ../projects/double-stars/uwe-pilz/sketches/20120336And.jpg
Robert Zebahl
Leipzig (Germany)
152mm (300x) Split with little gap in between and little difference in brightness. Seeing was not really good.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) hell ../projects/double-stars/frederik-wanink/sketches/36And.jpg
STT21 6m8 8m1 1.3'' 175° 2018 And 01h03m01.54s +47°22'34.10"

../images/binary-star-orbits/STT21-orbit.jpg

Robert Zebahl
Leipzig (Germany)
102mm (160x) 2020-11-02: The double star appears clearly elongated, but with no visible notch.
Uwe Pilz
Leipzig (Germany)
120mm (180x) weiß ../projects/double-stars/uwe-pilz/sketches/201105STT21.jpg
Mark McCarthy
Fremont (California/USA)
508mm (333x) Nice pale yellow bright stars, ~2 delta mag, needed 333x clearly resolve, ~1". Physical pair with 450 year period
BU397 AB 7m5 10m2 8.7'' 142° 2015 And 01h07m49.57s +46°50'31.60"
Uwe Pilz
Leipzig (Germany)
120mm (128x) schwierig ../projects/double-stars/uwe-pilz/sketches/201104beta397.jpg
Mark McCarthy
Fremont (California/USA)
508mm (205x) AB is an easy pale gold A and blue B. AC more difficult since C is much fainter, seen only with averted vision at twice the separation as B, and about forty degrees wider PA
STT515, phi And, 42 And AB 4m6 5m6 0.6'' 115° 2016 And 01h09m30.12s +47°14'30.60"

../images/binary-star-orbits/STT515-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
102mm (280x) 2020-11-04: Seeing 3-4/5; In no way separable or detectable as a double star.
Uwe Pilz
Leipzig (Germany)
120mm (180x) ../projects/double-stars/uwe-pilz/sketches/201104PhiAnd.jpg
Robert Zebahl
Leipzig (Germany)
152mm (300x) 2020-11-06: Seeing 3/5; Not detectable as a double star.
Mark McCarthy
Fremont (California/USA)
508mm (677x) Phi And. I get elongation in the speckle matter, but no better resolution. Bright 0.52" pair
BU235 Aa-Ab 7m5 7m8 0.8'' 143° 2018 Cas 01h10m34.31s +51°00'47.80"

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

Frederik Wanink
Itterbeck (Germany)
254mm (640x) Mehrfachsystem ../projects/double-stars/frederik-wanink/sketches/BU235.jpg
Mark McCarthy
Fremont (California/USA)
508mm (333x) Amazing system with five faint pairings, but the main attraction is Aa-Ab, near equal bright A, hairline at 205x and and a nice clean split at 333x, light yellow stars, slight magnitude difference. Seeing giving me nice round disks. Terrific. Physical pair with a 278 year period. Amazingly, Burnham discovered this with his 6-inch
STF96 7m9 8m9 0.9'' 287° 2018 Cas 01h12m41.24s +65°00'32.90"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) scheint enger als 0,9" ../projects/double-stars/frederik-wanink/sketches/STF96.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Mostly notched but moments of hairline split with seeing 1.5 delta mag. Very tough! Yellow-orange stars.
STF102 AB 7m3 9m2 0.5'' 271° 2016 And 01h17m47.96s +49°00'30.50"
AB-C 7m2 8m8 10.0'' 223° 2015
AB-D 7m2 10m8 23.6'' 58° 2015
CD 8m8 10m8 33.5'' 54° 2015
DE 10m8 10m2 98.5'' 356° 2015
Robert Zebahl
Leipzig (Germany)
102mm (62x) AB-C: 2020-11-02: At 28x clearly separated, fairly close together with a clear difference in brightness. The close pair AB appeared whitish with faint companion C. At 62x AB appeared white-yellowish, C grey-blue.
Uwe Pilz
Leipzig (Germany)
120mm (128x) AB-D ../projects/double-stars/uwe-pilz/sketches/201104stf102.jpg
STF155 AB 7m9 8m0 4.9'' 325° 2018 Psc 01h44m15.19s +09°29'02.70"
Robert Zebahl
Leipzig (Germany)
70mm (44x) Lovely embedded in a small group of stars. The components showed a small difference in brightness and were very close together. ../projects/double-stars/robert-zebahl/sketches/2019-10-24_stf155.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Nice near equal brightness white pair, ~5"
STF154 8m6 8m8 5.2'' 127° 2016 And 01h45m02.50s +43°42'22.80"
Robert Zebahl
Leipzig (Germany)
102mm (62x) 2020-11-02: At 28x clearly elongated, at 62x very finely separated with similar bright components. Pale orange & pale blue. At 125x similar color impression.
Uwe Pilz
Leipzig (Germany)
120mm (128x) ../projects/double-stars/uwe-pilz/sketches/201104STF154.jpg
★★ 1 Ari, STF174 6m3 7m2 2.9'' 164° 2018 Ari 01h50m08.60s +22°16'29.50"
Robert Zebahl
Leipzig (Germany)
63mm (46x) Clearly split, but tight with noticeable difference in brightness.
Robert Zebahl
Leipzig (Germany)
70mm (80x) At 67x pretty tight pair, but separated with a clear difference in brightness. The primary component appeared in a hint of orange. At 80x easy to separate.
Christopher Hay
Seeheim (Germany)
76mm (83x) 1 Arietis is clearly orange (not split) in 12x42 finder. In 3-inch at 83x fine split, primary fiery orange. At 100x split becomes more obvious, at 125x easy, but at expense of loss of colour.
Stefan Loibl
Rosenheim (Germany)
102mm (102x) slight color difference, A orange, B blueish
Sarah Gebauer
Germany
150mm (27x) im Dezember 2019 nicht getrennt ../projects/double-stars/sarah-gebauer/sketches/20191230%201%20Ari%20DSk.jpg
Robert Zebahl
Leipzig (Germany)
200mm (100x) Conditions in the target region: SQM-L 20.8
Nice double star with big difference in brightness.
Mark McCarthy
Fremont (California/USA)
203mm (533x) 1 Ari. ! Very beautiful yellow-orange A and robin's egg blue B, 3", one delta mag. probably one of the best color pairs
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty orange and blue pair, ~2 delta mag, ~2".
Karsten Kopp
Köln (Germany)
600mm (180x) Gut zu trennender Doppelstern mit schon auffälligem Helligkeitsunterschied. Der hellere leuchtet gelblich und der schwächere geht ins bläuliche. Schöner Doppelstern.
STF179 7m6 8m1 3.5'' 160° 2018 And 01h53m10.72s +37°19'16.30"
Robert Zebahl
Leipzig (Germany)
102mm (62x) 2020-11-02: At 62x very nice sight! Finely separated pair of almost equally bright components. At 125x a small difference in brightness is visible. Pale orange & slightly bluish.
Uwe Pilz
Leipzig (Germany)
120mm (150x) ../projects/double-stars/uwe-pilz/sketches/201104stf179.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal magnitude, 4", nice orange-yellow color.
STF183 AB-C 7m7 9m3 5.6'' 162° 2018 Tri 01h55m07.39s +28°47'52.60"
Sarah Gebauer
Germany
100mm (73x) die schwächere Komponente wurde erst auf den zweiten Blick sichtbar, eine reizvolle Konzentrationsübung ../projects/double-stars/sarah-gebauer/sketches/STF%20183.jpg
★★ H5 12, 9 Ari, lambda Ari AB 4m8 6m7 37.3'' 48° 2019 Ari 01h57m55.71s +23°35'45.80"
Robert Zebahl
Leipzig (Germany)
8x44 2020-11-25: Easily separable with noticeable difference in brightness. Primary component appeared slightly yellowish with dim companion.
Robert Zebahl
Leipzig (Germany)
70mm (15x) Easy to split with large distance and difference in brightness.
Stefan Loibl
Rosenheim (Germany)
102mm (41x) easily split, both components white, no color difference
Uwe Pilz
Leipzig (Germany)
105mm (200x) der helle Stern ist blauweiß ../projects/double-stars/uwe-pilz/sketches/191025_LamAri.jpg
Christopher Hay
Seeheim (Germany)
180mm (113x) AB: A strong pair dominating the 0.6° field of view. B presents a weak ochre colour tone, in charming contrast to pearly-white component A.
According to Stelledoppie a physical pair at a distance to us of 129 light years.
alpha Psc, 113 Psc, Alrischa, Kaitain, Okda STF202 AB 4m1 5m2 1.9'' 264° 2019 Psc 02h02m02.80s +02°45'49.40"
PWL1 AC 4m1 8m2 404.9'' 63° 2006
PWL1 AD 4m1 8m6 434.5'' 335° 2006

../images/binary-star-orbits/STF202-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (88x) AB: der hellere Stern ist weiß ../projects/double-stars/uwe-pilz/sketches/191129alpPsc.jpg
STF208, 10 Ari AB 5m8 7m9 1.3'' 349° 2018 Ari 02h03m39.26s +25°56'07.60"

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

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

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

Robert Zebahl
Leipzig (Germany)
63mm (42x) A-BC: Easy to split with quite large difference in brightness.
Christopher Hay
Seeheim (Germany)
71mm (32x) Fine split. A is mandarine orange. BC has trouble displaying its colour due to the overpowering light of A, but in good moments is clearly blue.
A-BC is a physical double at a distance to us of 393 light years.
BC is also physical, with a relatively short period of 63 years for C to circle B and a very tight periastron. Unobservable in 2013 at periastron with 0.1". Since then the angular separation has been widening rapidly and will reach 0.4" in 2029. B-C will then become observable in large amateur telescopes for three decades, after which C will fall quickly back to B.
Uwe Pilz
Leipzig (Germany)
105mm (52x) A-BC: einfach
Uwe Pilz
Leipzig (Germany)
120mm (128x) A-BC ../projects/double-stars/uwe-pilz/sketches/201105GammaAnd.jpg
Robert Zebahl
Leipzig (Germany)
152mm (100x) A-BC: Very easy. A: orange, BC: rather white.
Christopher Hay
Seeheim (Germany)
180mm (110x) A very strong pair in 0.6° FOV with powerful colour contrast, A yellow, BC ice blue.
René Merting
Drachhausen (Germany)
320mm (45x) A-BC: bei 45x ein knapp getrenntes Pärchen - Komponente A knallgelb mit einem Anhängsel nordöstlich - Komponente BC strahlt 3 Größenklassen schwächer - bei 144x wirkt BC grün-weiß, bei 45x war der Eindruck noch leicht gelblich
Mark McCarthy
Fremont (California/USA)
508mm (667x) BC: Component of STF 205, of which A is a brilliant orange and BC bright blue. In BC I can only see elongation through the speckle at 667x and 1067x. Short 62.63 year period which will get "easier" to about 0.2" by 2045
Mark McCarthy
Fremont (California/USA)
508mm (1067x) BC: I spent a good long while on this one, and tried hard to nail down the position angle. At 1067x, both with and without an apodising mask, but both times with a #80A light blue filter, which did seem to calm the diffraction a little, I had a clear view of the elongation with a strong sense of the weaker end being to the East or to the ESE. I also tried a 78% central obstruction mask, and while the diffraction became a grid, and the disks much smaller, I could clearly see the same elongation and weaker end, though at a much smaller scale. To my delight the current orbital solution puts the PA at 120.6-degrees, 0.179" separation, so I think I have detected it. I can't wait until 2033 when this becomes an easy pair!
Werner E. Celnik
Rheinberg (Germany)
150mm A-BC ../projects/double-stars/werner-celnik/photographs/GammaAnd%202011-10-31%201800UT%20Refr_150-1100%20DBK21_Col%207ms%205minGIOTTOMittel7500fr%20A10436%20kl.jpg
Winfried Kräling
Marburg (Germany)
127mm A-BC: Aufnahme vom 11.09.2020 am 127/1200mm Refraktor mit Barlowlinse (~2.5x)
Weit getrennt, Komponente A: goldgelb bis orange, Komponente BC: weißlich blau
../projects/double-stars/winfried-kraeling/photographs/2020-09-11-2012UT-Doppelstern-Gamma%20And.jpg
★★★ STF227, iota Tri, 6 Tri 5m3 6m7 3.7'' 69° 2016 Tri 02h12m22.28s +30°18'11.10"

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

Robert Zebahl
Leipzig (Germany)
70mm (57x) At 44x even separable with a clear difference in brightness, whereby the companion is almost outshone by the primary component. At 57x easy to separate. Primary component shines in bright orange, companion slightly orange. Beautiful sight together with STF232 in one field of view! ../projects/double-stars/robert-zebahl/sketches/2019-12-12_6_tri_stf232.jpg
Uwe Pilz
Leipzig (Germany)
105mm (88x) weiß und blau ../projects/double-stars/uwe-pilz/sketches/191230stf227.jpg
Christopher Hay
Seeheim (Germany)
180mm (110x) Well separated. Primary yellowish, secondary light blue. When 6 Tri drifts out of 0.6° FOV, STF232 drifts in.
6 Tri is a physical double at a distance to us of 291 light years.
Mark McCarthy
Fremont (California/USA)
203mm (205x) 6 Tri. Yellow A, white b, pretty. Wide, about two delta mag
Frederik Wanink
Itterbeck (Germany)
254mm (200x) Helligkeitsunterschied deutlich
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern ist noch gut zu trennen und der Helligkeitsunterschied ist mit gut 1,5 mag schon sehr auffällig. Der hellere Stern erstrahlt schön gelblich, der schwächer weiß. In den Momenten der wirklich ruhigen Luft, ein sehr schöner Doppelstern
★★★ STF231, 66 Cet AB 5m7 7m7 16.8'' 235° 2019 Cet 02h12m47.54s -02°23'37.10"
Christopher Hay
Seeheim (Germany)
30x80 Wide split. A is cream-white, B of indeterminate colour. Attractive pair in 1.7° FOV, scenery accentuated by 63 Psc about 3/4° to northwest.
While pleasant with 30x80, the pair becomes suprisingly difficult to split with 20x80, presumably due to the cumulative effect of 2m delta-mag and the red colour of the companion, which makes it stand out less than if it were blue (colour not seen, but stressed by Uwe Pilz in his 105mm observation, see below).
Uwe Pilz
Leipzig (Germany)
105mm (88x) weiß und leuchtend rot! ../projects/double-stars/uwe-pilz/sketches/191129_66Cet.jpg
STF240 8m3 8m6 4.8'' 52° 2018 Ari 02h17m15.74s +23°52'24.80"
Sarah Gebauer
Germany
100mm (136x) trotz gar nicht so geringen Abstands doch ein sehr enges und feines Pärchen, das die Nase eines Grinsegesichtes bildet ../projects/double-stars/sarah-gebauer/sketches/STF%20240.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Faint but pretty wide separation ~4", equal magnitude yellowish-white.
★★ iota Cas, STF262 & CHR6 CHR6 Aa-Ab 4m6 8m5 0.6'' 42° 2010 Cas 02h29m03.96s +67°24'08.70"
STF262 AB 4m6 6m9 2.9'' 230° 2017
STF262 AC 4m6 9m1 6.7'' 117° 2015
STF262 AD 4m6 8m5 210.9'' 60° 2016

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

Robert Zebahl
Leipzig (Germany)
55mm (27x) Only the D component was well visible. The components B & C were not visible even at magnifications up to 167x. The sky was clearly brightened (Bortle 7).
Robert Zebahl
Leipzig (Germany)
70mm (120x) Components A, B and C pretty close together, D far apart. Component B appeared slightly elongated on the first diffraction ring of the primary component. Rewarding! ../projects/double-stars/robert-zebahl/sketches/2019-08-25_iota_cas.jpg
René Merting
Drachhausen (Germany)
100mm (142x) AB: bei 142x zeigt sich Komponente B im SW mit gut einem Drittel das Abstandes AC, Helligkeitsunterschied 1.5 bis 2 Größenklassen
AC: bei 64x getrennt, schöner Farbkontrast, Komponente A ist weiß mit einem Stich ins Gelbe, C leicht bräunlich
AD: bei 32x extrem weiter Abstand zwischen A und D, Helligkeitsunterschied mehr als 2 Größenklassen (laut Stelle Doppie sogar 3.85 mag)
Uwe Pilz
Leipzig (Germany)
105mm (200x) Dreifachstern lohnend ../projects/double-stars/uwe-pilz/sketches/iotaCas.jpg
Sarah Gebauer
Germany
150mm (160x) bei 160x sind die Komponenten AC getrennt, B leider nicht, die schwache Komponente C versinkt fast im Strahlen der hellen Komponente A, ein sehr reizvoller Anblick! Von Komponente D wusste ich während der Beobachtung noch nichts, sie taucht unter den Feldsternen der Zeichnung auch auf ../projects/double-stars/sarah-gebauer/sketches/20200731%20Iota%20Cas%20DSk.jpg
Robert Zebahl
Leipzig (Germany)
152mm (129x) Component D easy to see even at lowest magnification. Component C is also easily visible at 49x. At 69x the component B is indicated, at 100x clearly visible. C appears slightly grey-bluish and obviously fainter than B. Grand sight at 129x!
Mark McCarthy
Fremont (California/USA)
508mm (1067x) CHR6 (Aa-Ab): This is a component of Iota Cas, STF 262 (which is a really pretty triple). CHR 6 at 1067x and seeing through the speckle image, I get elongation with a suspected blunter end which I assume is the B side, PA to the north [it's actually to the south -- my general orientation is correct but mis-interpret the brighter end]. Physical with 47 year period, currently at periastron and will tighten to 0.2" by 2036
★★ 30 Ari STFA5 AB 6m5 7m0 37.9'' 275° 2019 Ari 02h37m00.52s +24°38'50.00"
RAO8 BC 7m0 11m0 0.6'' 282° 2018
Robert Zebahl
Leipzig (Germany)
8x44 AB: 2020-11-25: Easy to split at still quite small separation and visible difference in brightness. The primary component appeared white-yellowish, the companion darker.
Robert Zebahl
Leipzig (Germany)
70mm (22x) AB: At 22x widely separated, striking with a rather small difference in brightness. A seemed a bit warmer in color compared to B with a hint of orange. At 44x, both seemed slightly orange with very little difference in color.
Uwe Pilz
Leipzig (Germany)
105mm (88x) AB: trennbar bei 22x. Weiß und blau ../projects/double-stars/uwe-pilz/sketches/191230_30Ari.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) AB: Near equal light orange, very wide. B has a C pair 0.6" and 4 delta mag.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Near equal magnitude, wide separated, PA to WSW
STF291 AB 7m7 7m5 3.4'' 117° 2020 Ari 02h41m06.59s +18°48'00.70"
AC 7m7 9m5 65.5'' 242° 2015
Robert Zebahl
Leipzig (Germany)
70mm (57x) AB: At 44x almost, at 57x clearly split, but still very tight with rather small difference in brightness.
Uwe Pilz
Leipzig (Germany)
105mm (88x) hellster Stern gelb, andere Farben nicht erkennbar ../projects/double-stars/uwe-pilz/sketches/191230stf291.jpg
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: White stars, near equal, close but well split, makes a 2+1 with a ~2 delta mag, very wide C
STF295, 84 Cet 5m8 9m7 3.6'' 301° 2012 Cet 02h41m14.00s -00°41'44.40"

../images/binary-star-orbits/STF295-orbit.jpg

Robert Zebahl
Leipzig (Germany)
102mm (160x) Quite easy at a moderate distance, whereby the companion appeared rather faint and was best visible with averted vision.
Uwe Pilz
Leipzig (Germany)
105mm (144x) trotz diesigem Himmel bei 144x indirekt erkennbar. Schwieriger bei 200x ../projects/double-stars/uwe-pilz/sketches/200111_84Cet.jpg
Robert Zebahl
Leipzig (Germany)
152mm (129x) Easy. The quite dim companion is immediately visible in moderate distance clearly outside of the first diffraction ring despite few, high clouds. The primary component appeared white-yellowish.
gamma Cet, 86 Cet, Kaffaljidhma STF299 AB 3m5 6m2 2.0'' 299° 2015 Cet 02h43m18.04s +03°14'08.90"
ALD124 AC 3m5 10m2 843.1'' 306° 2000
René Merting
Drachhausen (Germany)
100mm (142x) AB: bei 142x wirkt der Doppelstern leicht länglich, die Beugungsscheibchen sind jetzt schon zu groß (mittleres Seeing), um sinnvoll weiter zu vergrößern
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB: extrem schwierig ../projects/double-stars/uwe-pilz/sketches/191129gammaCet.jpg
STF301 7m8 8m7 8.2'' 18° 2016 Per 02h47m38.75s +53°56'35.80"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Rather faint double star with a handful of other stars in the immediate vicinity. At 22x clearly separated, but still close together with visible difference in brightness. At 31x the primary component looked slightly orange.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ganz knapp getrenntes Pärchen - Komponente B im Norden ist eine halbe Größenklasse schwächer - nett anzusehen
Sarah Gebauer
Germany
100mm (45x) bei 45x ganz knapp schon getrennt und täuscht einen Farbunterschied vor: die südwestliche Komponente wirkt leicht orange, die nordöstliche etwas bläulich ../projects/double-stars/sarah-gebauer/sketches/STF%20301.jpg
STF311, pi Ari, 42 Ari AB 5m3 8m0 3.3'' 118° 2015 Ari 02h49m17.55s +17°27'51.50"
Robert Zebahl
Leipzig (Germany)
70mm (133x) The companion is visible as elongated, non-condensed brightening in the first diffraction ring of the primary component.
Uwe Pilz
Leipzig (Germany)
105mm (144x) sehr schwierig bei 88x, eindeutig bei 144x ../projects/double-stars/uwe-pilz/sketches/191230_PiAri.jpg
A2906 & STF314 A2906 AB 7m3 8m8 0.3'' 115° 2018 Per 02h52m52.03s +52°59'50.60"
STF314 AB-C 7m0 7m3 1.6'' 316° 2018

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

Robert Zebahl
Leipzig (Germany)
152mm (129x) STF314 (AB-C): Beautifully separated, quite close together. Difference in brightness visible, but rather small. Easy to find and bright. Very nice.
Frederik Wanink
Itterbeck (Germany)
254mm (460x) STF314 (AB-C): ähnlich hell ../projects/double-stars/frederik-wanink/sketches/STF314.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) A2906 (AB): This is the brighter of the STF 314 pair. I have a feeling it is slightly elongated but nothing certain.
Mark McCarthy
Fremont (California/USA)
317mm (553x) STF314 (AB-C): near equal brightness, AB more yellow yellow-white of the two, ~2 disk separation
HU544 6m7 8m2 1.7'' 103° 2018 Per 03h15m48.70s +50°57'21.20"

../images/binary-star-orbits/HU544-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (133x) Clearly seen as figure '8' with noticeable difference in brightness.
Uwe Pilz
Leipzig (Germany)
105mm (196x) klebt am ersten Ring ../projects/double-stars/uwe-pilz/sketches/Hu544.jpg
Uwe Pilz
Leipzig (Germany)
105mm (260x) im ersten Ring
Robert Zebahl
Leipzig (Germany)
152mm (129x) Wonderfully separated in equally beautiful star surroundings! Clear difference in brightness visible. To the east there is a brighter star, which shines yellowish-orange. HU544 itself seems rather cool in color. ../projects/double-stars/robert-zebahl/sketches/2019-11-23_hu544.jpg
STFA7 AB 7m4 7m8 44.1'' 234° 2017 Tau 03h31m03.47s +27°43'53.60"
Christopher Hay
Seeheim (Germany)
71mm (13x) Well separated. Northern component seems slightly brighter.
Mark McCarthy
Fremont (California/USA)
80mm (13x) Nice finder split, equal mag but faint, ~8th mag.
Uwe Pilz
Leipzig (Germany)
105mm (21x) gleichhell, einfach ../projects/double-stars/uwe-pilz/sketches/stfa7.jpg
Robert Zebahl
Leipzig (Germany)
120mm (18x) Well split with noticeable difference in brightness. Nice view together with the double star STF401 located southeast.
★★ STF401 AB 6m6 6m9 11.5'' 270° 2020 Tau 03h31m20.76s +27°34'18.50"
Christopher Hay
Seeheim (Germany)
18x80 Cleanly split. Supplemented nicely by the wide pair STFA7 directly north, in very star-poor surroundings in 4° FOV.
Christopher Hay
Seeheim (Germany)
71mm (13x) Just separated.
Uwe Pilz
Leipzig (Germany)
105mm (21x) ein Hauch schwärze dazwischen ../projects/double-stars/uwe-pilz/sketches/stf401.jpg
Robert Zebahl
Leipzig (Germany)
120mm (18x) Barely split at 18x. At 40x difference in brightness is visible. Nice view together with the double star STFA7 located northwest.
Christopher Hay
Seeheim (Germany)
180mm (113x) Very wide separation. Southern component slightly towards orange compared to the northern one, which is slightly towards blue. Very attractive in 0.6° FOV with STFA7.
A physical pair at 318 light years distance from us.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal white ~7", nice, W-E. Forms a double-double in wider FOV with STF 375.
STF434 AB 7m8 8m3 33.7'' 83° 2019 Per 03h43m58.92s +38°22'25.60"
AC 7m8 13m6 91.9'' 350° 2015
Robert Zebahl
Leipzig (Germany)
16x70 AB: 2020-11-07: Beautiful sight! Nice separation and color contrast: vivid orange & subtle blue.
Robert Zebahl
Leipzig (Germany)
102mm (28x) AB: 2020-11-08: Easy to separate, beautiful sight! Light orange & light blue. ../projects/double-stars/robert-zebahl/sketches/2020-11-08_stf434.jpg
★★ BU535, omicron Per, 38 Per, Atik 3m9 6m7 1.1'' 20° 2015 Per 03h44m19.13s +32°17'17.70"
Uwe Pilz
Leipzig (Germany)
105mm (88x) =omikron Per, in IC348, lohnend! ../projects/double-stars/uwe-pilz/sketches/ic348.jpg
Robert Zebahl
Leipzig (Germany)
152mm (300x) In steady moments the faint companion is clearly recognizable as a small brightening in the first diffraction ring of the primary component.
Mark McCarthy
Fremont (California/USA)
317mm (270x) No split at 270x
★★★ STF470, 32 Eri AB 4m8 5m9 6.9'' 349° 2019 Eri 03h54m17.49s -02°57'17.00"
Robert Zebahl
Leipzig (Germany)
55mm (27x) At 27x split, but still tight with noticeable difference in brightness. A slight difference in colors could be seen. At 56x the color difference was very evident: The brighter component appeared slightly yellowish, the fainter one slightly bluish. Highly recommended! The sketch was done few days later during another observation. ../projects/double-stars/robert-zebahl/sketches/2019-02-09_32_eri.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) Farbkontrast, gelborange-blauweiß ../projects/double-stars/uwe-pilz/sketches/32Eri.jpg
omicron 2 Eri, 40 Eri, STF518 A-BC 4m4 9m3 82.7'' 102° 2019 Eri 04h15m16.32s -07°39'10.30"
BC 9m5 11m2 8.2'' 330° 2019

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

Uwe Pilz
Leipzig (Germany)
105mm (244x) A ist gelblich. B fiel sofort ins Auge, auch bei 144x. C war extrem schwierig. A musste außerhalb des Gesichtsfeldes stehen, aber auch dann war er nur indirekt sichtbar. Dann aber überraschte der verhältnismäßig große Abstand B-C. ~ A ist ein Hauptreihenstern ähnlich der Sonne. B ist ein weißer Zwerg, einer der hellsten am Himmel. C ist ein Roter Zwerg, davon gibt es nicht viele in der Reichweite kleiner Instrumente. Insgesamt hat man drei Zwergsterne auf einen Blick: Einen gewöhnlichen (=Hauptreihen-) Zwerg, einen weißen und einen roten. ../projects/double-stars/uwe-pilz/sketches/200120_40Eri.jpg
Berthold Fuchs
Wiesbaden (Germany)
130mm A-BC: Triplesystem with a white Dwarf ../projects/double-stars/berthold-fuchs/photographs/Keid.png
STF519 & GUI5 STF519 AB 7m8 9m4 17.9'' 348° 2015 Per 04h20m53.71s +50°22'39.00"
GUI5 AC 7m8 10m8 108.8'' 193° 2015
Robert Zebahl
Leipzig (Germany)
16x70 STF519 (AB): 2020-11-07: Beautifully framed by brighter stars! Primary component A appears slightly orange with a much fainter, very close companion. To the south is S445, which forms a prominent triangle of stars of different brightness. The brightest of these three stars also appears orange.
Robert Zebahl
Leipzig (Germany)
102mm (28x) STF519 (AB): 2020-11-08: Well separated with large difference in brightness. Primary component appeared white-yellowish. South very outstanding is the double star S445. Worthwhile due to the beautiful surroundings. ../projects/double-stars/robert-zebahl/sketches/2020-11-08_stf519_s445.jpg
S445 & ES2604 S445 AB 7m3 8m2 71.0'' 328° 2017 Per 04h20m57.50s +50°15'17.40"
S445 AC 7m3 9m3 150.3'' 263° 2016
ES2604 AD 7m3 14m8 24.8'' 321° 2015
ES2604 BE 8m2 11m2 23.3'' 263° 2015
Robert Zebahl
Leipzig (Germany)
16x70 2020-11-07: Together with the uneven double star STF519 in one field of view. The three widely separated, differently bright components A, B and C form a prominent triangle, with A appearing orange. Very beautiful!
Robert Zebahl
Leipzig (Germany)
102mm (28x) 2020-11-08: Components A, B & C visible as a prominent triangle of different brightness. Component A appears slightly yellowish. Together with the northern located double star STF519 in one field of view. Very nice! ../projects/double-stars/robert-zebahl/sketches/2020-11-08_stf519_s445.jpg
STF546 7m9 9m2 6.8'' 181° 2015 Tau 04h27m00.62s +19°07'03.60"
Uwe Pilz
Leipzig (Germany)
105mm (144x) ../projects/double-stars/uwe-pilz/sketches/200115stf546.jpg
STF545 AB 6m9 8m8 19.0'' 58° 2020 Tau 04h27m04.85s +18°12'27.10"
Uwe Pilz
Leipzig (Germany)
105mm (288x) Begleiter schwach, erfordert sehr hohe Vergrößerung. Hauptstern weiß ../projects/double-stars/uwe-pilz/sketches/200115stf545.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Blush white, ~2 delta mag, PA to NE, wide separation.
★★ STF559 7m0 7m0 3.0'' 278° 2019 Tau 04h33m33.04s +18°01'00.20"
Robert Zebahl
Leipzig (Germany)
70mm (57x) Barely split with similarly bright components.
Robert Zebahl
Leipzig (Germany)
102mm (160x) Very nice view! Easy to separate, similarly bright at a nice distance from each other. The colors of the components changed over time: orange and subtle blue.
Uwe Pilz
Leipzig (Germany)
105mm (144x) trennbar mit 88x, westlicher Stern scheint etwas heller und gelb-orange, östlicher Stern orange ../projects/double-stars/uwe-pilz/sketches/200115stf559.jpg
Robert Zebahl
Leipzig (Germany)
152mm (69x) Beautiful sight, similar bright components, pretty tight.
SHJ45, 88 Tau AB 4m3 7m8 69.2'' 300° 2017 Tau 04h35m39.23s +10°09'39.30"
Sarah Gebauer
Germany
150mm (30x) mit freiem Auge als ein Stern erkannt, bei 30x sauber getrennt mit sichtbarem Helligkeitsunterschied ../projects/double-stars/sarah-gebauer/sketches/20191230%2088%20Tau%20DSk.jpg
S455, tau Tau, 94 Tau AB 4m2 7m0 62.5'' 214° 2017 Tau 04h42m14.70s +22°57'25.10"
Sarah Gebauer
Germany
150mm (26x) schon bei 26x deutlich getrennt
Sarah Gebauer
Germany
150mm (30x) mit freiem Auge als ein Stern gesehen, bei 30x weit getrennt, eine Komponente ist deutlich heller als die andere ../projects/double-stars/sarah-gebauer/sketches/20191230%20Tau%20Tau%20DSk.jpg
STT560, pi 3 Ori AB 3m2 11m3 73.2'' 171° 2016 Ori 04h49m50.41s +06°57'40.60"
Uwe Pilz
Leipzig (Germany)
105mm (144x) wahrscheinlich ein optischer Doppelstern ../projects/double-stars/uwe-pilz/sketches/210222Pi3Ori.jpg
★★ 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.
STF623 AB 7m0 8m7 20.5'' 207° 2018 Tau 04h59m53.75s +27°19'32.20"
Uwe Pilz
Leipzig (Germany)
105mm (88x) erkennbar bei 21x ../projects/double-stars/uwe-pilz/sketches/200215_Struve623.jpg
STT92, 5 Aur AB 6m0 9m5 4.1'' 285° 2017 Aur 05h00m18.35s +39°23'40.90"

../images/binary-star-orbits/STT92-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (160x) schwierig ../projects/double-stars/uwe-pilz/sketches/5Aur.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) Nur bei sehr hoher Vergrößerung überhaupt zu trennen, schwierig ../projects/double-stars/uwe-pilz/sketches/200115stt92.jpg
STF627 AB 6m6 7m0 21.2'' 260° 2020 Ori 05h00m33.93s +03°36'56.80"
René Merting
Drachhausen (Germany)
18x70 zwei klar sichtbare bequem getrennte Sterne - Komponente B im SW wirkt leicht gelblicher als A - maximal 1/4 Größenklasse Helligkeitsunterschied - ein schöner nicht zu eng und nicht zu weit getrennter Fernglas-Doppelstern
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x ein bequem getrenntes Pärchen zweier annähernd gleich heller Sterne - Komponente B im Westen ist vielleicht eine viertel Magnitude schwächer - das Sternpaar fällt auf in der Umgebung, weil es kaum hellere Sterne im Umfeld gibt - zurück auf 20x ist es ein schickes eng stehendes Paar, aber nicht zu eng
Uwe Pilz
Leipzig (Germany)
105mm (16x) erkennbar schon bei Fernglasvergrößerung ../projects/double-stars/uwe-pilz/sketches/210222STF627.jpg
STF630 A-BC 6m5 7m7 14.4'' 49° 2020 Ori 05h02m00.03s +01°36'31.90"
René Merting
Drachhausen (Germany)
18x70 schick, ein auffälliges knapp getrenntes Pärchen - Komponente B im NO ist keine ganze Größenklasse schwächer (lt. Stelle Doppie aber doch 1.21 mag)
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x ein knapp getrenntes Pärchen - Komponente BC im NO scheint eine knappe Größenklasse schwächer, er wirkt ein wenig bunter, matter - zurück auf 20x wirkt das Pärchen schicker, weil die beiden Komponenten dann noch enger stehen - der Helligkeitsunterschied ist nicht mehr ganz so ausgeprägt
Uwe Pilz
Leipzig (Germany)
105mm (88x) gelb-orange und fahlviolett ../projects/double-stars/uwe-pilz/sketches/210222STF630.jpg
STF645 A-BC 6m0 9m1 11.3'' 29° 2017 Tau 05h09m45.06s +28°01'50.20"
Uwe Pilz
Leipzig (Germany)
105mm (88x) ../projects/double-stars/uwe-pilz/sketches/200215_Struve645.jpg
Mark McCarthy
Fremont (California/USA)
317mm (270x) White and grey, 2 delta mag, wide. BC is BU 1047 0.3" near equal, but not seen
★★ 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.
STF648 AB 8m1 8m9 5.0'' 64° 2020 Aur 05h10m59.19s +32°02'19.50"

../images/binary-star-orbits/STF648-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
55mm (40x) At 40x tight with obviously fainter component.
Robert Zebahl
Leipzig (Germany)
70mm (33x) Separated, but tight with noticeable difference in brightness.
Uwe Pilz
Leipzig (Germany)
105mm (144x) beide Komponenten gelb ../projects/double-stars/uwe-pilz/sketches/200111_stf648.jpg
Mark McCarthy
Fremont (California/USA)
317mm (270x) Light orange, half delta mag, wide.
STF654, rho Ori AB 4m6 8m5 6.4'' 65° 2018 Ori 05h13m17.48s +02°51'40.50"
Uwe Pilz
Leipzig (Germany)
105mm (88x) ../projects/double-stars/uwe-pilz/sketches/210319RhoOri.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Rho Ori Bright light orange-yellow A star with 3 delta mag yellow-white B, ~5"
STT517 AB 6m8 7m0 0.7'' 244° 2019 Ori 05h13m31.55s +01°58'03.70"

../images/binary-star-orbits/STT517-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (144x) Es erforderte einige Mühe zu sehen, welches der hellere Stern ist, ../projects/double-stars/uwe-pilz/sketches/210319_os517.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Consistently split but images are bloated by poor seeing, yellowish white stars, <1", near equal
★★★ STF668, 19 Ori, beta Ori, Rigel A-BC 0m3 6m8 9.7'' 202° 2017 Ori 05h14m32.27s -08°12'05.90"
Robert Zebahl
Leipzig (Germany)
55mm (83x) The second component was immediately seen as faint companion. ../projects/double-stars/robert-zebahl/sketches/2019-01-21_stf668.jpg
Robert Zebahl
Leipzig (Germany)
70mm (67x) First attempt at 133x: much fainter component clearly visible as a tiny star at a relatively large distance. After that the visibility was easy even at 67x. At 44x the faint component could only be guessed.
Robert Zebahl
Leipzig (Germany)
102mm (160x) Much fainter companion immediately visible as tiny star far outside the diffraction pattern of the primary component.
Uwe Pilz
Leipzig (Germany)
105mm (288x) zwei Ringe und zahlreiche radiale Strahlen um den Hauptstern ../projects/double-stars/uwe-pilz/sketches/Rigel.jpg
Jörg S. Schlimmer
Germany
127mm (108x) high contrast ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Rigel_Refraktor_2021_03_07_bear_filtered_96dpi.jpg
Jörg S. Schlimmer
Germany
305mm (170x) high contrast ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung%20Rigel%20Newton%202021_02_27%20bear_filtered_96dpi.jpg
STF667 7m2 8m8 4.2'' 316° 2018 Ori 05h14m41.31s -07°04'18.10"
René Merting
Drachhausen (Germany)
100mm (107x) bei 64x stehen beide Sterne noch eng aneinander - ein Phänomen, Komponente A im SO ist nicht richtig weiß, die 1.5 mag schwächere Komponente B wirkt dagegen weiß, also trotz großem Helligkeitsunterschied sauberer weiß - erst bei 107x gelingt mir die sichere Trennung, kein Wunder bei dem schlechten Seeing heute
Uwe Pilz
Leipzig (Germany)
105mm (120x) ../projects/double-stars/uwe-pilz/sketches/210319stf667.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty orange A and 2x fainter B, which is a little blue-orange. 5"
★★ STF653, 14 Aur AB 5m0 10m9 9.8'' 11° 2014 Aur 05h15m24.39s +32°41'15.30"
AC 5m0 7m3 14.3'' 225° 2019
AD 5m0 10m8 179.7'' 322° 2010
Sarah Gebauer
Germany
100mm (45x) AC: schon bei geringer Vergrößerung erkennt man beim zweiten Hinsehen, dass es sich um ein Sternpärchen handelt; ein schönes Doppelsternbeispiel für die Kategorie "ein heller und ein sehr schwacher nah daneben"
Uwe Pilz
Leipzig (Germany)
105mm (88x) AC: heller Stern gelblich weiß ../projects/double-stars/uwe-pilz/sketches/200111_14Aur.jpg
Mark McCarthy
Fremont (California/USA)
317mm (270x) AB: Triple, one of which is one delta mag fainter than the other equal pair. All well separated. [AC is the brighter pair, AB fainter.]
Mark McCarthy
Fremont (California/USA)
317mm (270x) AC: Triple, one of which is one delta mag fainter than the other equal pair. All well separated. [AC is the brighter pair, AB fainter.]
STF681 AB 6m6 9m2 23.2'' 183° 2020 Aur 05h20m39.16s +46°57'49.60"
Robert Zebahl
Leipzig (Germany)
16x70 2020-11-07: Together with Capella in one field of view. Beautiful surrounding. Moderate distance and large difference in brightness. Primary component appears white-yellowish with faint companion.
Uwe Pilz
Leipzig (Germany)
105mm (88x) orange ../projects/double-stars/uwe-pilz/sketches/191216stf681.jpg
STF698 AB 6m7 8m3 31.4'' 348° 2019 Aur 05h25m12.94s +34°51'18.60"
Robert Zebahl
Leipzig (Germany)
102mm (62x) Beautiful double star, easy to separate and quite striking. Primary component appeared in clear orange, the companion was too faint to identify the color.
Uwe Pilz
Leipzig (Germany)
105mm (88x) rot-orange und blaugrau, lohnend ../projects/double-stars/uwe-pilz/sketches/200111_stf698.jpg
Robert Zebahl
Leipzig (Germany)
152mm (22x) Easy with a attractive separation and a clear difference in brightness. A: pale yellow; B: creamy white with a touch of blue. At 49x the color impression was a bit more intense. Located in beautiful field of stars.
Mark McCarthy
Fremont (California/USA)
317mm (270x) Orange-yellow A and lilac B, wide, finder split, 1 delta mag. Pretty.
STF699 AB 7m9 8m6 8.9'' 346° 2018 Aur 05h25m38.50s +38°02'41.10"
Robert Zebahl
Leipzig (Germany)
55mm (25x) Well separated with slightly fainter companion.
Robert Zebahl
Leipzig (Germany)
70mm (22x) Separated at 22x, but still a relatively tight pair with a moderate difference in brightness. Together with sigma Aur in one field of view. Overall rather dim double star. At 57x very nice view! A: pale orange, B: slightly bluish
Uwe Pilz
Leipzig (Germany)
105mm (88x) schwach, aber lohnend. Orange und blau ../projects/double-stars/uwe-pilz/sketches/191216stf699.jpg
Mark McCarthy
Fremont (California/USA)
317mm (270x) Wide yellow and blue-white, half delta mag.
★★ STF719 AB 7m5 8m8 1.4'' 336° 2016 Aur 05h30m06.14s +29°32'55.30"
AC 7m5 9m4 15.0'' 353° 2020
Robert Zebahl
Leipzig (Germany)
70mm (22x) AC: At 22x clearly visible difference in brightness at moderate separation. The companion appears only as a dim star. At 57x the color contrast is also quite noticeable. A: light orange, C: silvery blue
Robert Zebahl
Leipzig (Germany)
102mm (62x) AC: Easy with a rather dim companion. The color seemed a bit more intense than in the 6-inch refractor. A: lovely pale orange; B: grey-bluish.
Uwe Pilz
Leipzig (Germany)
105mm (200x) AC: der helle Stern ist weiß. ../projects/double-stars/uwe-pilz/sketches/200111_stf719.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) AB waren schwieriger, als es die Daten vermuten ließen. C ist schwach und erforderte indirektes Sehen ../projects/double-stars/uwe-pilz/sketches/200117stf719.jpg
Robert Zebahl
Leipzig (Germany)
152mm (49x) AC: Easy to separate with a significant difference in brightness. A appeared in bright orange, B appeared greyish-blue.
Robert Zebahl
Leipzig (Germany)
152mm (129x) AB: At 129x clearly elongated. Difference in brightness visible. The seeing was mediocre (3/5), so that the diffraction disks were only occasionally visible. At 180x no better.
Mark McCarthy
Fremont (California/USA)
317mm (277x) AB: widely separated with an orange A and bluish B
STF728, 32 Ori 4m4 5m8 1.3'' 44° 2017 Ori 05h30m47.06s +05°56'53.30"

../images/binary-star-orbits/STF728-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (288x) sauber getrennt, Beugungsscheiben berühren sich gerade ../projects/double-stars/uwe-pilz/sketches/32Ori.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) 32 Ori White and off white pair, 1.5 delta mag, ~1.5". Nice and very clean with seeing
delta Ori, Mintaka BU558 AB 2m4 14m2 33.4'' 229° 2016 Ori 05h32m00.40s -00°17'56.70"
STFA14 AC 2m4 6m8 56.2'' 2017
René Merting
Drachhausen (Germany)
10x50 AC: Komponente C zeigt sich gut abgesetzt im NW von A - Helligkeitsunterschied enorm, mindestens 3 Größenklassen
René Merting
Drachhausen (Germany)
18x70 AC: total leicht - Komponente C thront gut getrennt nördlich über A (Mintaka) und ist gut 2 bis 3 Größenklassen schwächer (sogar 4.42 mag laut Stelle Doppie) und trotzdem noch ein mittelheller Stern - A ist gleißend weiß, C weißgrau
Christopher Hay
Seeheim (Germany)
76mm (25x) AC: C set off well from A. A pure white, C steel blue. Although in the middle of Orion the pair dominates the 3.1° FOV.
Uwe Pilz
Leipzig (Germany)
105mm (22x) AC: blau und violett ../projects/double-stars/uwe-pilz/sketches/210222Mintaka.jpg
Uwe Pilz
Leipzig (Germany)
105mm (200x) AC: sehr weit in reichem Sternfeld ../projects/double-stars/uwe-pilz/sketches/Mintaka.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) AC: reinweiß-violett
Mark McCarthy
Fremont (California/USA)
317mm (553x) AC: Bright, 2 delta mag, very wide.
★★★ theta 1 Ori, Trapezium, 41 Ori AB 6m5 7m5 8.9'' 32° 2019 Ori 05h35m15.82s -05°23'14.30"
AC 6m5 5m1 12.9'' 133° 2019
BD 7m5 6m4 19.4'' 121° 2019
CD 5m1 6m4 13.4'' 62° 2019
AE 6m5 11m1 4.6'' 352° 2013
CF 5m1 11m5 4.7'' 120° 2013
Robert Zebahl
Leipzig (Germany)
16x70 2021-02-24: Components A, C & D are clearly separable from each other. The fainter B component is almost completely outshone by A. The pair AB appears clearly elongated and is with concentrated observation in a few moments even visible separated.
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2021-02-24: The different bright components A-D are clearly visible separated from each other.
Christopher Hay
Seeheim (Germany)
71mm (32x) 13x: CD definitely split, A uncertain, B not present.
18x: A, C and D definite, B uncertain.
32x: A, B, C and D present and clear.
Mediocre seeing but good transparency with strong M42 and an inkling of M43 at 32x. B is an eclipsing variable with a period of 6.5 days and an amplitude of 0.6mag, presumably obervation was at minimum, which would explain the difficulty in seeing it at lowest powers. C is the main source of excitation of the great Orion Nebula M42/43.
Jörg S. Schlimmer
Germany
127mm (108x) A-E split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung%20Trapez%20Refraktor%202021_02_28%20bear_filtered_96dpi.jpg
Jörg S. Schlimmer
Germany
305mm (170x) A-F split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung%20Trapez%20Newton%202021_03_02%20bear_filtered_96dpi.jpg
★★ STF761 AB 7m9 8m4 68.1'' 202° 2016 Ori 05h38m36.54s -02°33'12.70"
AC 7m9 8m6 72.1'' 209° 2016
AD 7m9 11m8 32.7'' 308° 2016
BC 8m4 8m6 8.5'' 269° 2015
Christopher Hay
Seeheim (Germany)
30x80 B-C fine split, C appears slightly weaker than B. Component A is too far away at this power from BC to feel that it belongs. Very attractive ensemble overall in the same field of view with Sigma Ori, which also presents three of its components.
René Merting
Drachhausen (Germany)
100mm (32x) A-BC: bei 32x stehen südlich von Komponente A in ordentlichem Abstand die Komponenten B (und C)
BC: bei 32x sehe ich zwei dicht zusammen stehende gleich schwache Sterne, knapp getrennt
Uwe Pilz
Leipzig (Germany)
320mm (80x) B und C sind deutlich orange. In der Zeichnung ist STF 961 fälschlicherweise mit STF 791 bezeichnet. Im selben Feld wie Sigma Orionis ../projects/double-stars/uwe-pilz/sketches/200212sigmaOri.jpg
26 Aur, STF753 AB-C 5m5 8m4 12.4'' 269° 2019 Aur 05h38m38.10s +30°29'32.80"
Christopher Hay
Seeheim (Germany)
15x60 On tripod. Very stretched figure-8, does not actually resolve. Essential to focus the binoculars on some other star.
Robert Zebahl
Leipzig (Germany)
70mm (22x) Separable at 22x, but quite close together and pretty uneven. Primary component appeared in bright orange. At 57x easy to separate. The faint companion appeared silvery-blue.
Christopher Hay
Seeheim (Germany)
76mm (40x) C clearly set off from AB. AB is yellow, no particular colour seen on C.
AB (also known as BU 1240) is a physical double at 566 light years distance to us. So is AB-C according to Stelledoppie, making this a physical triple system.
Uwe Pilz
Leipzig (Germany)
105mm (88x) heller Stern blauweiß ../projects/double-stars/uwe-pilz/sketches/200215_26Aur.jpg
Christopher Hay
Seeheim (Germany)
180mm (113x) Wide split. Yellow-blue collour contrast of AB to C. Neither of the two colours very strong on its own, but in fine contrast to the other. Reminiscent of the way Polaris appears in a 3-inch at 40x, with less delta-mag, making it easier, but lacking Polaris' dramatic blue of the companion.
Mark McCarthy
Fremont (California/USA)
317mm (277x) Bright yellow AB and a fainter yellow white C.
★★★ sigma Ori, 48 Ori BU1032 AB 4m1 5m3 0.3'' 77° 2015 Ori 05h38m44.77s -02°36'00.20"
STF762 AB-C 3m8 8m8 11.4'' 239° 2019
STF762 AB-D 3m8 6m6 12.9'' 84° 2019
STF762 AB-E 3m8 6m3 41.4'' 62° 2019
STF762 DC 6m6 8m8 23.8'' 252° 2019
STF762 EC 6m3 8m8 52.9'' 242° 2019
STF762 ED 6m3 6m6 29.8'' 233° 2019
STF3135 AB-F 3m8 7m9 208.0'' 324° 2016
Christopher Hay
Seeheim (Germany)
10x42 Binoculars with internal stabilisation, handheld.
AB-D: No split, nor any elongation of AB towards D seen.
AB-E: E is set off well from AB but harder to split than the numbers would suggest. This is partly due to the major delta-mag, and partly to the circumstance that D effectively reduces the "free" stretch of sky to 29".
STF761 is a nice complement a few minutes of arc to the west and makes the visual impression of possibly belonging to the Sigma Ori complex, but Stelledoppie doesn't confirm this.
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld.
AB-D: No split acheived. However, focussing on AB feels uncertain, presumably due to disturbance by D. Also not split with 15x60 on tripod.
AB-E: E is set off well from AB.
Christopher Hay
Seeheim (Germany)
25x80 AB-D: D is set off nicely from AB and appears very slightly on the orange side, particularly in contrast to E.
René Merting
Drachhausen (Germany)
100mm (64x) AB-C: bei 64x zeigt sich Komponente C ganz schwach südwestlich von AB
AB-D: bei 32x schließt sich an die zartgelbe Komponente AB unmittelbar im Osten dicht stehend D weißorange an - ein schickes Trio zusammen mit E weiter östlich
AB-E: bei 32x zeigt sich in vierfacher Entfernung von AB-D die Komponente E weiter östlich in einer Linie - E ist ähnlich hell wie D
Sarah Gebauer
Germany
150mm (125x) ein sehr schönes Muster des Mehrfachsystems, auch wenn längst nicht alle Komponenten getrennt zu sehen waren, AB-C, AB-D und AB-E getrennt, A und B nicht ../projects/double-stars/sarah-gebauer/sketches/20200409%20Sigma%20Ori%20DSk.jpg
Uwe Pilz
Leipzig (Germany)
320mm (80x) AB-C-D schon im Aufsuchokular sichtbar. Sehr lebhafte Farben, einer der schönsten Mehrfachsterne überhaupt. Im selben Feld mit STF761 ../projects/double-stars/uwe-pilz/sketches/200212sigmaOri.jpg
STF774, zeta Ori, 50 Ori, Alnitak AB 1m9 3m7 2.4'' 167° 2017 Ori 05h40m45.52s -01°56'33.30"
AC 1m9 9m6 58.5'' 10° 2017

../images/binary-star-orbits/STF774-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (128x) AB: Big difference in brightness. I could see the fainter component near the first ring of the Airy pattern of the brighter component.
Uwe Pilz
Leipzig (Germany)
105mm (288x) AB: sauber getrennt, Beugungsscheiben berühren sich gerade ../projects/double-stars/uwe-pilz/sketches/Alnitak.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) AB: Alnitak. Easy, 2 delta mag,~2", white
Mark McCarthy
Fremont (California/USA)
317mm (207x) AC: Alnitak:AC is a very faint star widely separated outside of the main star's glare.
Mark McCarthy
Fremont (California/USA)
317mm (207x) AB: about 2" and 1.5 delta mag.
★★ STF764 6m4 7m1 25.8'' 15° 2019 Aur 05h41m20.98s +29°29'14.70"
Christopher Hay
Seeheim (Germany)
7x50 On tripod. PA very clear and the pair splits apart in good moments. Keeping Alnath (Beta Tau) out of the FOV helps. Chi Aur is in a nice little arc of stars on north-western edge of FOV, enhances the aesthetics of the field of view.
Robert Zebahl
Leipzig (Germany)
8x44 2020-11-25: Cleanly split, rather close together. In beautiful star field together with beta Tauri.
Christopher Hay
Seeheim (Germany)
15x60 On tripod. Distinctly split, attractive sight in light orange and light blue, a visually strong pair. 26 Aur (STF753, not quite split) in same 3.3° field of view.
Christopher Hay
Seeheim (Germany)
25x80 Well split. Brighter star honey-yellow, companion ice-blue. Very similar brightnesses. A visually strong, compact pair at this power in 3.2° field of view.
Robert Zebahl
Leipzig (Germany)
55mm (25x) Easy to split with large distance and noticeable difference in brightness.
Robert Zebahl
Leipzig (Germany)
70mm (22x) Very easy and bright, pretty wide apart with a small difference in brightness; whitish and slightly yellowish.
Christopher Hay
Seeheim (Germany)
76mm (40x) Well separated, even brightness of components. A appears immediately orangish, B bluish, but after a minute of observation this impression fades to colourlessness.
Uwe Pilz
Leipzig (Germany)
105mm (88x) blauweiß und orange, kleiner aber gut sichtbarer Helligkeitsunterschied. Schon bei 21x sichtbar, sehr lohnend. ../projects/double-stars/uwe-pilz/sketches/200117stf764.jpg
Christopher Hay
Seeheim (Germany)
180mm (113x) Wide apart but a strong pair with slight delta-mag. Mild orange-to-blue colour contrast of A to B that remains stable in contrast to 76mm observation in same night.
Mark McCarthy
Fremont (California/USA)
317mm (277x) two bright whites widely separated
STF783 8m1 9m7 8.3'' 2015 Aur 05h44m37.74s +29°00'59.70"
Uwe Pilz
Leipzig (Germany)
105mm (288x) schwierig, weil schwach. Heller Stern gelblich ../projects/double-stars/uwe-pilz/sketches/200117stf783.jpg
STF3115 6m5 7m5 0.9'' 337° 2017 Cam 05h49m04.64s +62°48'29.60"

../images/binary-star-orbits/STF3115-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) gerade eben trennbar mit schwarzem Zwischenraum ../projects/double-stars/frederik-wanink/sketches/STF3115.jpg
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)
16x70 ../projects/double-stars/uwe-pilz/sketches/200918stf79.jpg
STF805 8m4 8m9 12.1'' 50° 2015 Tau 05h51m48.20s +28°26'59.60"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein schwaches Paar - Komponente B zeigt sich knapp abgesetzt im NO von A und ist eine halbe Größenklasse schwächer - unauffällig trotz scheinbarer Sternarmut im Umfeld
Uwe Pilz
Leipzig (Germany)
105mm (88x) schwach, aber lohnend, gelb und blaugrau ../projects/double-stars/uwe-pilz/sketches/200117stf805.jpg
STT545, 37 Aur, theta Aur AB 2m6 7m2 4.2'' 304° 2019 Aur 05h59m43.24s +37°12'45.90"

../images/binary-star-orbits/STT545-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (57x) At 57x nothing seen at first sight. At 133x the much fainter component was visible after a short time as a tiny star in the correct position angle. With this knowledge, the observation at 57x was also successful, even if one has to look very closely. The challenge here is not so much the angular distance as the large difference in brightness.
Uwe Pilz
Leipzig (Germany)
105mm (200x) blauweiß. Wegen der etwas unruhigen Luft und des Helligkeitsunterschiedes nicht einfach. ../projects/double-stars/uwe-pilz/sketches/191216theAur.jpg
BU16, 3 Mon 5m0 8m0 1.9'' 355° 1996 Mon 06h01m50.42s -10°35'52.60"
Uwe Pilz
Leipzig (Germany)
105mm (260x) schwache Aufhellung im ersten Ring ../projects/double-stars/uwe-pilz/sketches/3Mon.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) Begleiter schwach ../projects/double-stars/uwe-pilz/sketches/bu16.jpg
BU17 AB 6m9 9m3 3.6'' 192° 2019 Mon 06h08m25.39s -11°08'46.60"
AC 6m9 10m8 10.2'' 260° 2015
BC 9m3 10m8 9.3'' 276° 1998
Uwe Pilz
Leipzig (Germany)
105mm (288x) Dreifachstern! (Burnham 17) ../projects/double-stars/uwe-pilz/sketches/bu17.jpg
BU1008, eta Gem, 7 Gem, Propus 3m5 6m2 1.7'' 255° 2018 Gem 06h14m52.69s +22°30'24.60"

../images/binary-star-orbits/BU1008-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (260x) Aufhellung im ersten Ring
Uwe Pilz
Leipzig (Germany)
105mm (288x) sehr schwierig ../projects/double-stars/uwe-pilz/sketches/etaGem.jpg
Robert Zebahl
Leipzig (Germany)
152mm (225x) Already comparatively easy at 180x. The faint companion can be seen well as a quite distinct, slightly elongated, partly round brightening. At 225x and above it becomes easy and immediately apparent, even if the diffraction rings of the primary component are not permanently visible due to the seeing. The primary component was shining in a bright orange.
Mark McCarthy
Fremont (California/USA)
203mm (333x) Propus. Yellow A and blue-yellow B, 2 delta mag, 1.5" very nice
STF900, epsilon Mon, 8 Mon AB 4m4 6m6 12.2'' 30° 2019 Mon 06h23m46.10s +04°35'34.20"
Robert Zebahl
Leipzig (Germany)
55mm (42x) Relatively large distance and clear difference in brightness. The lighter component seemed white-yellowish, the weaker one slightly greenish-blue. The color contrast, however, was not particularly conspicuous.
Uwe Pilz
Leipzig (Germany)
105mm (288x) Blau-rot ../projects/double-stars/uwe-pilz/sketches/epsMon.jpg
★★★ beta Mon, 11 Mon STF919 AB 4m6 5m0 7.1'' 133° 2019 Mon 06h28m49.07s -07°01'59.00"
STF919 AC 4m6 5m4 9.9'' 126° 2019
STF919 BC 5m0 5m3 3.0'' 109° 2019
BU570 AD 4m6 12m1 26.5'' 56° 2014
René Merting
Drachhausen (Germany)
18x70 das Mehrfachsystem ist als 8 erkennbar, eine extrem knappe Berührung, wobei die Komponenten B und C im SO nur als ein Stern gesehen werden können - BC ist gleich hell wie A allein
René Merting
Drachhausen (Germany)
100mm (32x) A-BC: bei 32x ein wunderschöner eng stehender Doppelstern - die bei dieser Vergrößerung noch nicht trennbare Komponenten B und C im SO wirken leicht gelblich und ist leicht heller als A - die Komponenten A und BC wollen sich berühren, schaffen es aber nicht ;-)
BC: bei 64x wirkt BC leicht länglich wie ein Stäbchen - bei 107x dann der Aha-Effekt, es sind zwei Sterne, knapp getrennt und mit gleichem Positionswinkel wie A-BC - beide Komponenten B und C sind gleich hell und einzeln jeweils etwa eine halbe Größenklasse schwächer als A im NW
Uwe Pilz
Leipzig (Germany)
105mm (137x) Dreifachsystem, drei fast gleichhelle Sterne. Alle blau-weiß ../projects/double-stars/uwe-pilz/sketches/betaMon.jpg
★★ STT147 AB 6m8 8m7 42.7'' 74° 2016 Aur 06h34m19.37s +38°04'33.60"
A-CD 6m8 9m8 44.5'' 119° 2016
CD 10m6 11m0 0.5'' 109° 1957
Uwe Pilz
Leipzig (Germany)
105mm (200x) ../projects/double-stars/uwe-pilz/sketches/200123stt147.jpg
Robert Zebahl
Leipzig (Germany)
152mm (69x) At 22x, the components A, B and CD are immediately conspicuous, where A dominates. They form a beautiful, acute-angled triangle. At 69x, color differences are also visible. A: subtle orange; B: grey-bluish; CD: tendency to orange. Rewarding, because the double stars STF 928 & STF 929 as well as the very conspicuous carbon star UU Aur are in close proximity and can partly be observed together in one field of view!
★★ STF928 AB 7m9 8m6 3.4'' 131° 2019 Aur 06h34m41.81s +38°32'24.50"
AC 7m9 12m4 130.9'' 124° 2002
BC 8m6 12m4 127.3'' 124° 2015
Robert Zebahl
Leipzig (Germany)
102mm (62x) AB: At 28x the double star already appeared elongated, at 62x beautifully separated, with component A shining in a warm, subtle orange. At 125x A appeared orange, B grey-bluish.
Uwe Pilz
Leipzig (Germany)
105mm (200x) AB: kühl-weiß und lila ../projects/double-stars/uwe-pilz/sketches/200123stf928.jpg
Robert Zebahl
Leipzig (Germany)
152mm (69x) AB: Clearly separated, but tight. Moderate difference in brightness. Nice view with the nearby double stars STT147 & STF 929 and the carbon star UU Aur!
STF922 AB 7m7 10m8 10.5'' 137° 2015 Cam 06h38m18.76s +64°44'06.00"
AC 7m7 11m2 24.4'' 2015
Robert Zebahl
Leipzig (Germany)
70mm (100x) 2020-04-16: Component A looked slightly yellowish, components B & C appeared rather dim. ../projects/double-stars/robert-zebahl/sketches/2020-04-16_stf922.jpg
STT152, 54 Aur 6m2 7m8 0.8'' 34° 2016 Aur 06h39m33.12s +28°15'47.40"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwierig, Luftunruhe ../projects/double-stars/frederik-wanink/sketches/STT152.jpg
★★ STF946 7m3 9m1 4.0'' 129° 2019 Lyn 06h44m51.62s +59°26'57.40"
Robert Zebahl
Leipzig (Germany)
102mm (86x) Easy to split with noticeable difference in brightness. Very nice view together with the triple system STF 948 in one field of view! ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf946_stf948.jpg
Uwe Pilz
Leipzig (Germany)
105mm (88x) im selben Feld mit 12 Lyn ../projects/double-stars/uwe-pilz/sketches/200409_12lynstf946.jpg
Robert Zebahl
Leipzig (Germany)
152mm (100x) At 100x and 129x easy to separate, quite uneven. Primary component appeared yellowish, the fainter one rather greyish. Fantastic view together with 12 Lyn (STF 948) in one field of view!
★★★ AGC1, 9 CMa, alpha CMa, Sirius AB -1m5 8m4 10.7'' 75° 2016 CMa 06h45m08.92s -16°42'58.00"

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

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

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

Robert Zebahl
Leipzig (Germany)
55mm (27x) AC: Components A/B and C well separated, but tight. Significant difference in brightness. The fainter C companion appeared slightly orange, the brighter one white-bluish.
Robert Zebahl
Leipzig (Germany)
55mm (167x) AB: Components A and B separated, whereby the Airy disks slightly overlap. The difference in brightness was well visible. ../projects/double-stars/robert-zebahl/sketches/2019-01-21_stf948.jpg
Robert Zebahl
Leipzig (Germany)
63mm (140x) AB: Components A and B split with almost no space in between. The difference in brightness was visible. ../projects/double-stars/robert-zebahl/sketches/2019-01-22_stf948.jpg
Robert Zebahl
Leipzig (Germany)
70mm (22x) AC: Well split, relatively close together with significant difference in brightness.
Robert Zebahl
Leipzig (Germany)
70mm (133x) AB: Both components A + B clearly split, whereby the diffraction rings where merged together. A very nice view together with component C. I sketched this triplet, which reflects my impression well. Unfortunately, the distance and position angle are not particularly well observed. Also the difference in brightness I didn't noticed during my observation. ../projects/double-stars/robert-zebahl/sketches/2019-01-20_stf948.jpg
Robert Zebahl
Leipzig (Germany)
102mm (129x) At 28x the pair AC is nicely separated without any problems. The close pair AB is already recognizable at 86x as a clear figure '8', at 125x wonderfully separated. The components A & B appear yellowish. Very nice view together with STF 946 in one field of view! ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf946_stf948.jpg
Uwe Pilz
Leipzig (Germany)
105mm (88x) im selben Feld mit STF 946 ../projects/double-stars/uwe-pilz/sketches/200409_12lynstf946.jpg
Robert Zebahl
Leipzig (Germany)
152mm (129x) At 49x the pair AC is beautifully separated with a significant difference in brightness. At 100x, the close pair AB is also separated, although still very close together. A slight difference in brightness is noticeable. At 129x, the view is magnificent. The two bright components A & B present themselves yellowish, the fainter component C rather greyish. STF 948 can be well observed in a field of view with the neighbouring double star STF 946. Both show a nice overall scenery.
STF991 AB 8m0 9m2 3.8'' 165° 2019 Gem 06h57m01.26s +24°57'27.90"
Sarah Gebauer
Germany
100mm (73x) haarscharf getrennt, nordwestliche Komponente ist etwas heller und größer und die südöstliche steht ganz schwach daneben
Uwe Pilz
Leipzig (Germany)
105mm (144x) bei 88x trennbar. Orange, Begleiter schwach ../projects/double-stars/uwe-pilz/sketches/210131stf991.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) White and orange, 2 delta mag, ~5", PA to S.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Pretty off-yellow A and a little ruddy red B, nice
STT159, 15 Lyn AB 4m5 5m5 0.7'' 236° 2017 Lyn 06h57m16.60s +58°25'23.00"

../images/binary-star-orbits/STT159-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (200x) nicht getrennt im April 2020 ../projects/double-stars/uwe-pilz/sketches/200409_15Lyn.jpg
Frederik Wanink
Itterbeck (Germany)
254mm (640x) relativ einfach ../projects/double-stars/frederik-wanink/sketches/15Lyn.jpg
★★ STTA80 AB 7m2 7m4 124.1'' 53° 2015 Gem 06h58m06.59s +14°13'43.40"
AC 7m2 8m4 81.2'' 112° 2015
Christopher Hay
Seeheim (Germany)
7x45 Handheld. AB are a well separated, matching pair. Immediately striking in field.
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. AB are a widely separated pair, and joined by a third, weaker, point of light, which is C, well separated. A charming little triangle.
Involved in (or making up?) Monti 4 asterism.
Robert Zebahl
Leipzig (Germany)
70mm (22x) All 3 components form a striking triangle and are slightly different in color. A (western component): white-bluish; B (northern component): white-yellowish; C (southern component): orange, partly slightly reddish. ../projects/double-stars/robert-zebahl/sketches/2019-12-18_stta80.jpg
★★ STF1007 AB 7m4 11m4 14.6'' 300° 2015 Gem 07h00m37.12s +12°43'24.20"
AC 7m4 10m0 21.9'' 244° 2015
AD 7m4 7m7 67.7'' 28° 2016
Christopher Hay
Seeheim (Germany)
7x45 AD: Handheld. Stands out immediately as double with clear PA in field of several similarly bright single stars. Unsupported, hand tremor prevents actually seeing each component singly, but by bracing arms in reclining chair the well-matched pair is clearly split.
A physical double at a distance to us of 914 light years.
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. AD well split. A is distinctly brighter and seems bluish. Nice in 4.5° FOV together with STTA80 ABC.
Robert Zebahl
Leipzig (Germany)
70mm (22x) AD: Wide separation, small difference in brightness. Slight difference in color, but difficult to describe. Component A at least seemed rather white. South of STF1007 there is also the double star HJ3288 and the star HD52976, which appears in a bright orange. Together in one field of view a beautiful sight. ../projects/double-stars/robert-zebahl/sketches/2019-12-18_stf1007_hj3288.jpg
BU573 7m2 7m8 0.8'' 311° 2018 Mon 07h01m49.89s -10°52'56.30"

../images/binary-star-orbits/BU573-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (247x) schwach gekerbt ../projects/double-stars/uwe-pilz/sketches/bu573.jpg
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
★★ STF1001 AB 7m8 9m4 9.1'' 66° 2019 Lyn 07h03m05.51s +54°10'26.60"
AC 7m8 9m3 9.9'' 58° 2019
BC 9m4 9m3 1.6'' 2019
Robert Zebahl
Leipzig (Germany)
102mm (160x) 2020-03-23: At 28x the pair A-BC is easy to separate. At 160x, the very close pair BC shows split. The component A appears slightly orange.
Uwe Pilz
Leipzig (Germany)
105mm (88x) ../projects/double-stars/uwe-pilz/sketches/200409stf1001.jpg
Robert Zebahl
Leipzig (Germany)
152mm (129x) 2020-03-23: At 22x, the wide pair A-BC already appears separated, but still very tight. At 69x, A appears in a subtle orange. The pair BC shows elongated and rather greenish-bluish. At 100x BC is already visible as figure '8' and almost separated, at 129x clearly separated. Components B and C are still very close together and equally bright. The color impression remains. An interesting and rewarding triple system! ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf1001.jpg
STF1037 AB 7m2 7m3 0.8'' 304° 2019 Gem 07h12m49.08s +27°13'30.20"

../images/binary-star-orbits/STF1037-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (260x) eingekerbt ../projects/double-stars/uwe-pilz/sketches/stf1037.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) bei 200x trennbar, beide gelb ../projects/double-stars/uwe-pilz/sketches/210131stf1037.jpg
Frederik Wanink
Itterbeck (Germany)
254mm (640x) leichter, gleich hell ../projects/double-stars/frederik-wanink/sketches/STF1037.jpg
STF1033 AB 7m8 8m4 1.5'' 278° 2017 Lyn 07h14m48.05s +52°32'44.10"
AC 7m8 10m2 79.6'' 273° 2015
Robert Zebahl
Leipzig (Germany)
102mm (160x) The pair AB appears clearly separated, but still pretty tight with a well visible difference in brightness. The faint C component is wide apart at a similar position angle. ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf1033.jpg
★★ 145 CMa, Winter Albireo HJ3945, Winter Albireo AB 5m0 5m8 26.5'' 50° 2020 CMa 07h16m36.84s -23°18'56.10"
SHY508 BC 5m8 6m8 999.9'' 165° 1999
Christopher Hay
Seeheim (Germany)
7x45 AB: On tripod. Very tight but definitely split. A tends towards orange. Proximity to A prevents determination of colour of B.
René Merting
Drachhausen (Germany)
8x30 AB: Winter-Albireo - ein eng stehendes Pärchen, ganz knapp getrennt - Komponente A im SW knallig orange, bei B ist schwer eine Farbnuance erkennbar, eher weißlich und deutlich schwächer als A
René Merting
Drachhausen (Germany)
10x50 AB: ein knapp getrenntes Paar (nicht besser als im 8x30) - Komponente A leicht gelblich, B ist kühler, weißlich
Christopher Hay
Seeheim (Germany)
10x56 BC: On tripod. B is set off well from visually distracting A (which in turn is the primary of HJ3945, the Winter Albireo). C seen clearly and well framed in 6.3° field of view with Tau CMa at centre of field.
Shaya 508 BC is a physical double at a distance to us of 303 light years. Reported in E.J. Shaya, R. Olling, 2011: Very Wide Binaries and Other Comoving Stellar Companions: A Bayesian Analysis of the Hipparcos Catalogue. The C component is more than 3° to the south of the B component. Coordinates of C component (= HD 35578) are RA 07h20m32.5s, DEC -26°42'01".
Christopher Hay
Seeheim (Germany)
10x56 AB: On tripod. Immediately striking as well-split pair. A flashing orange. Glare and scintillation of A prevent any definite colour impression of B.
René Merting
Drachhausen (Germany)
18x70 AB: ein gut getrenntes Pärchen - Komponente A im Südwesten ist apfelsinenorange, B wirkt anfangs eisblau, bei längerer Betrachtung weißgrau
Christopher Hay
Seeheim (Germany)
42mm (12x) AB: Clean split. Orange and blue.
René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 32x leuchtet Komponente A goldgelb, B im NO wirkt weiß ohne den erwarteten Farbstich, auch nicht bei 107x und auch nicht, wenn ich die Sterne leicht unscharf stelle - trotzdem sehenswert - auch bei 20x zeigen sich beide Sterne ordentlich voneinander getrennt, A strahlt jetzt noch tiefgelber, fast orange
Uwe Pilz
Leipzig (Germany)
105mm (37x) AB: sofort auffallend, blau-orange ../projects/double-stars/uwe-pilz/sketches/hj3945.jpg
Robert Zebahl
Leipzig (Germany)
120mm (23x) AB: Evident, easy to split at large angular distance. Brighter component appeared very orange, fainter one bluish.
STF1050 AB 8m1 8m8 19.4'' 21° 2020 Lyn 07h19m51.29s +54°55'18.40"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Rather faint, obviously split with visible difference in brightness. View similar to STF 1062.
Robert Zebahl
Leipzig (Germany)
102mm (28x) ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf1050_stf1062.jpg
STF1062, 19 Lyn AB 5m8 6m7 13.8'' 317° 2019 Lyn 07h22m52.06s +55°16'53.30"
Robert Zebahl
Leipzig (Germany)
70mm (22x) Clearly separated, moderate distance, noticeable difference in brightness. The colors seemed different, but not exactly definable.
Robert Zebahl
Leipzig (Germany)
102mm (28x) ../projects/double-stars/robert-zebahl/sketches/2020-03-23_stf1050_stf1062.jpg
Uwe Pilz
Leipzig (Germany)
105mm (21x) ../projects/double-stars/uwe-pilz/sketches/200409_19Lyn.jpg
Robert Zebahl
Leipzig (Germany)
152mm (22x) Easy to separate, but still quite close together with visible difference in brightness. Color wise unremarkable.
ES2625 & S548 ES2625 AB 7m0 12m4 11.9'' 24° 2015 Gem 07h27m40.54s +22°08'29.30"
S548 AC 7m0 8m9 35.3'' 277° 2019
Christopher Hay
Seeheim (Germany)
15x45 S548 (AC): Binoculars with internal stabilisation, handheld. Clean split. Secondary very faint. Primary yellowish-orange, a colour impression confirmed (without split) in handheld 7x45. Seen together with Eskimo Nebula (stellar) in 4.5° FOV.
A physical double at a distance to us of 1199 light years.
René Merting
Drachhausen (Germany)
100mm (20x) S548 (AC): bei 32x ein weit getrenntes Paar - Komponente A strahlt schwach gelblich … eher dunkelgelb - Komponente C im Westen von A ist gut 1.5 Magnituden schwächer und dunkelgrau bis lachsorange - der Doppelstern steht isoliert, fällt aber nicht übermäßig auf - zurück auf 20x ist das Paar weiterhin gut getrennt erkennbar
Uwe Pilz
Leipzig (Germany)
105mm (88x) S548 (AC): bei 21x trennbar, orange und fahlblau ../projects/double-stars/uwe-pilz/sketches/210131s548.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) S548 (AC): Orange with a 2x fainter white star, PA slightly SW. AB is 12th mag and not seen
★★★ STF1110, alpha Gem, 66 Gem, Castor AB 1m9 3m0 5.5'' 53° 2019 Gem 07h34m35.86s +31°53'17.80"
AC 1m9 9m8 69.8'' 163° 2017
AD 1m9 10m1 179.8'' 221° 2017

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

Robert Zebahl
Leipzig (Germany)
55mm (27x) AB: At 27x slight difference in brightness visible. Double star appeared as '8'. At 38x clearly split, but tight.
Robert Zebahl
Leipzig (Germany)
70mm (44x) AB: At 44x the double star appeared as an '8'. At 100x clearly split with noticeable difference in brightness. Both components appeared white.
Christopher Hay
Seeheim (Germany)
76mm (50x) AB, 18 February 2021: At 23x oval-elongated with clear position of component A. At 50x finely split. At 83x best sight with first diffraction rings slightly overlapping. At 100x nice pattern of the Airy disks and the overlapping first and second diffraction rings of both components.
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 32x wirkt der Stern leicht länglich - bei 107x stehen die beiden Sterne schön eng mit überlagernden Beugungsscheibchen, die Komponenten sind dennoch getrennt erkennbar - Komponente B im Osten ist eine halbe Magnitude schwächer - ganz schwacher Farbkontrast
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB: blauweiß-weiß ../projects/double-stars/uwe-pilz/sketches/Castor.jpg
Winfried Kräling
Marburg (Germany)
127mm (250x) AB: 13.03.2017: Beide Komponenten gelblich mit geringem Helligkeitsunterschied, bereits bei V=60x getrennt. ../projects/double-stars/winfried-kraeling/sketches/170313_02_alpha%20Gem_Castor.jpg
Christopher Hay
Seeheim (Germany)
180mm (200x) AB: Two fat spotlights in space. Component B seems greenish at first sight (using a first-class reflector free of chromatic aberration), and certainly has a different hue than component A. The second diffraction rings of A and B meet.
Frederik Wanink
Itterbeck (Germany)
254mm AB ../projects/double-stars/frederik-wanink/photographs/Castor.jpg
★★ STF1126 AB 6m5 7m0 0.9'' 176° 2019 CMi 07h40m06.99s +05°13'51.90"

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

Uwe Pilz
Leipzig (Germany)
105mm (288x) beide gelb. Es war schwierig, die hellere Komponente zu erkennen. Direkt neben Prokyon. ../projects/double-stars/uwe-pilz/sketches/210330STF1126.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wow, very close <1" hair-split, near equal brightness
★★ STF1122 7m8 7m8 14.4'' 185° 2017 Cam 07h45m52.47s +65°09'28.10"
René Merting
Drachhausen (Germany)
18x70 ein genialer, heller Stern für 18x-Ferngläser - ein wunderschönes enges Sternpaar, wo drei Blatt Papier dazwischen passen
Robert Zebahl
Leipzig (Germany)
70mm (31x) 2020-05-15: At 22x immediately apparent with a beautiful separation between the equally bright components. One component appeared slightly bluish, the other light orange. At 44x the subtle color difference can be seen a bit better. The double star is in a nice star field together with 51 Cam. ../projects/double-stars/robert-zebahl/sketches/2020-04-15_stf1122.jpg
René Merting
Drachhausen (Germany)
320mm (45x) bei 72x ein gut getrenntes Pärchen zweier gleich heller Sterne - trotz vieler gleich heller Sterne im Gesichtsfeld wirkt das Doppel gut isoliert
STF1137 8m0 9m1 2.9'' 133° 2010 CMi 07h46m35.35s +04°07'50.10"
Uwe Pilz
Leipzig (Germany)
105mm (200x) Der schwächere Stern ist nur indirekt sichtbar, deshalb schwierig ../projects/double-stars/uwe-pilz/sketches/210330STF1137.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Light orange and blue, pretty wide, 1.5 delta mag
★★ STF1127 AB 7m0 8m4 5.6'' 340° 2019 Cam 07h47m00.43s +64°03'07.30"
AC 7m0 9m7 11.6'' 178° 2019
BC 8m4 9m7 16.9'' 173° 2019
René Merting
Drachhausen (Germany)
18x70 AC: von den Rahmendaten ist eine Trennung von A und C eigentlich möglich, aber vermutlich ist der Helligkeitsunterschied zwischen beiden Sternen von 2.7 mag zu groß - ich konnte C nicht entdecken
Robert Zebahl
Leipzig (Germany)
70mm (57x) 2020-04-15: At 31x all three components are visible, with B still very close to component A. Component C is rather dim overall. At 57x, A appears white-yellowish, B slightly orange. ../projects/double-stars/robert-zebahl/sketches/2020-04-15_stf1127.jpg
René Merting
Drachhausen (Germany)
320mm (45x) AB: bei 45x ist B ganz dicht nördlich an A angrenzend erkennbar (knapp getrennt), B etwas heller als C im Süden - bei 72x wird die Trennung einfacher und alle drei Sterne stehen fast auf einer Linie
AC: bei 45x ist C ganz schwach südlich von A erkennbar - bei 72x schätze ich, etwas mehr als die doppelte Entfernung AB, C wirkt grau, während A und B weiß strahlen
STF1171 6m5 9m9 2.0'' 326° 2015 Cnc 08h01m00.78s +23°34'59.20"
René Merting
Drachhausen (Germany)
100mm (213x) bei 142x schmiegt sich Komponente B an der Grenze zur Sichtbarkeit im Süden von Komponente A ganz dicht an den viel größeren Bruder, der ohne Beugungsringe auskommt - bei 213x zeigt sich B leicht abgesetzt von A
Robert Zebahl
Leipzig (Germany)
102mm (187x) Observation from the city at half moon. At magnifications between 187x and 280x I could see the very dim companion almost permanently near the first diffraction ring. But the diffraction ring itself was hardly visible. Main problem here was probably the low brightness of the companion.
Uwe Pilz
Leipzig (Germany)
105mm (200x) schwierig. Zu ahnen bei 144x ../projects/double-stars/uwe-pilz/sketches/200303stf1171.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow and orange, 4 delta mag! very faint and close B
★★ STF1177, 17 Cnc 6m7 7m4 3.5'' 350° 2019 Cnc 08h05m37.06s +27°31'46.90"
Robert Zebahl
Leipzig (Germany)
70mm (57x) Easy to separate, but still relatively close together. Well visible difference in brightness. Color of the components was not clearly visible. Nice view overall.
René Merting
Drachhausen (Germany)
100mm (64x) bei 107x sehe ich ein knapp getrenntes schön eng stehendes Pärchen - Komponente B im Norden ist eine dreiviertel Größenklasse schwächer - das Weiß von A wirkt kühler - zurück auf 64x sehe ich eine Ameise mit dünnem Hals, in ruhigen Momenten zeigen sich beide Sterne sogar getrennt
Uwe Pilz
Leipzig (Germany)
105mm (144x) ../projects/double-stars/uwe-pilz/sketches/200303stf1177.jpg
Uwe Pilz
Leipzig (Germany)
105mm (180x) Blau und Orange - sehr schöner Farbkontrast, unterstützt durch die ähnliche Helligkeit ../projects/double-stars/uwe-pilz/sketches/210330STF1177.jpg
Christopher Hay
Seeheim (Germany)
125mm (160x) Well split despite substantial turbulence in the atmosphere. Main component creamy yellow-white, companion pale blue. A very attractive colour contrast warranting a one-star rating.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF1177.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellowish, 1 delta mag, ~4"
Karsten Kopp
Köln (Germany)
600mm (180x) Gut zu trennender Doppelstern, mit gut erkennbaren Helligkeitsunterschied . Der hellere Stern leuchter weiß-gelblich, während der schwächere leicht bläulich schimmert. Schöner Farbkontrast
★★★ zeta Cnc, 16 Cnc STF1196 AC 5m3 5m8 6.2'' 62° 2020 Cnc 08h12m12.79s +17°38'51.20"
STF1196 AB-C 4m9 5m8 6.0'' 64° 2020
STF1196 AB 5m3 6m2 1.0'' 2020
HUT1 Ca-Cb 6m2 7m1 0.3'' 32° 2019

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

Robert Zebahl
Leipzig (Germany)
70mm (133x) The wide pair AB-C is already separable at 22x. The pair AB shows at 133x two clearly overlapping diffraction disks with small difference in brightness, but without any notch. ../projects/double-stars/robert-zebahl/sketches/2020-03-24_stf1196.jpg
Christopher Hay
Seeheim (Germany)
71mm (32x) AB-C: Finely split. AB yellowish. Substantial delta-mag.
Robert Zebahl
Leipzig (Germany)
102mm (86x) AB-C: Easy to separate. A: light grey, B: pale orange.
Stefan Loibl
Rosenheim (Germany)
102mm (164x) AB-C clearly split, AB obviously elongated but not split
Uwe Pilz
Leipzig (Germany)
105mm (288x) weißblau-gelb-gelb ../projects/double-stars/uwe-pilz/sketches/zetaCnc.jpg
Robert Zebahl
Leipzig (Germany)
120mm (67x) AB-C: Evident difference in brightness, easy to split. Both components of similar color.
Robert Zebahl
Leipzig (Germany)
120mm (200x) AB: Very tight. The Airy disks were still touching. Slight difference in brightness. Extremely beautiful triple star! ../projects/double-stars/robert-zebahl/sketches/2019-02-24_stf1196.jpg
Winfried Kräling
Marburg (Germany)
127mm (250x) 08.04.2018: Sehr schön, 3-fach Stern, A = weißgelb, B = weißgelb, C = weißgelb ../projects/double-stars/winfried-kraeling/sketches/180408_02_Zeta%20Cnc.jpg
Sarah Gebauer
Germany
150mm (83x) AB-C: bei 83x sind AB-C sauber getrennt, laut Atlas 2020 6,1'' Abstand, die Komponenten A und B mit 1,1'' lassen sich nicht trennen, viele schöne Feldsterne dabei ../projects/double-stars/sarah-gebauer/sketches/20200411%20Zeta%20Cnc%20DSk.jpg
Christopher Hay
Seeheim (Germany)
180mm (200x) AB: Hair-fine split. A and B both yellowish-white. C wide from AB, bluish-white, nice colour contrast to AB.
Frederik Wanink
Itterbeck (Germany)
254mm (200x) AB-C: AB (1,1") nicht bemerkt ../projects/double-stars/frederik-wanink/sketches/STF1196.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Ca-Cb: not quite round, oval/olive shaped. It is the AB-C of STF 1196.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Triple, all near equal magnitude, yellow-white. AB ~0.8", hair split.
Mark McCarthy
Fremont (California/USA)
317mm (553x) AC: Triple, all near equal magnitude, yellow-white. AC ~6", wide split.
Karsten Kopp
Köln (Germany)
600mm (257x) AB: Die Komponenten AB-C bei etwas größerem Helligkeitsunterschied einfach zu trennen und auch schön anzusehen. Sterne erstrahlen weißlich gelb. Komponente AB war nicht zu trennen.
★★ STF1224, 24 Cnc A-BC 6m9 7m5 5.7'' 53° 2019 Cnc 08h26m39.82s +24°32'03.70"
Uwe Pilz
Leipzig (Germany)
105mm (128x) fahlviolett und gelb ../projects/double-stars/uwe-pilz/sketches/210330STF1224.jpg
★★ STF1223, phi 2 Cnc 6m2 6m2 5.2'' 219° 2019 Cnc 08h26m47.08s +26°56'07.80"
Christopher Hay
Seeheim (Germany)
25x80 Hair-fine, but definite and constantly held split. Charming in 3.3° FOV with Phi1 and Chi Cnc.
Easier than I would have thought at only 25x. This is clearly aided by the very well-matched brightnesses of the components. The 70% full moon nearby in Leo also helps, as its brightness boosts the eyes' acuity. During the observation I gaze intentionally directly into the moon at intervals in order to utilise this effect, a technique honed in earlier binocular observations of planets.
Primary is slightly brighter than the secondary, again surprising considering that delta-mag is only 0m05 (6m16 to 6m21 according to Stelledoppie). Not a physical pair, alas, although it looks so much like one.
Uwe Pilz
Leipzig (Germany)
105mm (28x) weiß und gelb ../projects/double-stars/uwe-pilz/sketches/210330Phi2Cnc.jpg
Uwe Pilz
Leipzig (Germany)
105mm (88x) sehr schön, blauweiß-gelbweiß ../projects/double-stars/uwe-pilz/sketches/stf1223.jpg
Karsten Kopp
Köln (Germany)
600mm (180x) Schöner und einfach zu trennender Doppelstern, wo beide Sterne dieselbe Helligkeit haben und weißlich strahlen. Wie ein Augenpaar im All
STF1230 9m3 10m6 34.2'' 186° 2015 Cnc 08h28m25.95s +16°51'09.10"
Uwe Pilz
Leipzig (Germany)
105mm (200x) Komponente B nur indirekt. bei 88x erahnbar. ../projects/double-stars/uwe-pilz/sketches/200323STF1230.jpg
Karsten Kopp
Köln (Germany)
600mm (180x) Einfacher Doppelstern mit größerem Helligkeitsunterschied.
★★ STF1245 AB 6m0 7m2 10.0'' 25° 2019 Cnc 08h35m51.05s +06°37'13.90"
AC 6m0 10m7 100.4'' 109° 2017
AD 6m0 11m9 110.3'' 292° 2017
AE 6m0 9m6 114.8'' 207° 2017
Robert Zebahl
Leipzig (Germany)
70mm (57x) AB at 22x separated, but very close, uneven pair. A appeared white-yellowish, B orange, partly reddish. Opposite in a wide separation the fainter component E was visible. At 57x, A appeared white-yellowish, B orange. ../projects/double-stars/robert-zebahl/sketches/2020-03-24_stf1245.jpg
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x ein sehr enges Pärchen, gerade so getrennt - das Sternpaar ist heller, als viele andere Sterne in der unmittelbaren Umgebung, dadurch ist es sehr auffällig - Komponente A strahlt reinweiß, B steht dem in nichts nach, auch wenn die Komponente gut eine Magnitude schwächer ist
Sarah Gebauer
Germany
100mm (45x) AB: schmal, aber deutlich getrennt, die südliche Komponente sichtbar heller, die nordöstliche schwächer
Uwe Pilz
Leipzig (Germany)
105mm (88x) AB ../projects/double-stars/uwe-pilz/sketches/200323STF1245.jpg
Mark McCarthy
Fremont (California/USA)
508mm (533x) AB: Wide and bright pair, light yellow and orange, easy, slight mag difference
Karsten Kopp
Köln (Germany)
600mm (180x) AB: Schöner und einfacher Doppelstern, wobei die Komponente A weißlich gelb und Komponente B gelblich orange leuchtet. Das Sternfeld in direkter Umgebung rundet den schönen Eindruck ab. ../projects/double-stars/karsten-kopp/sketches/STF1245.jpg
★★ STF1268, iota Cnc, 48 Cnc 4m1 6m0 30.7'' 308° 2018 Cnc 08h46m41.82s +28°45'35.60"
Christopher Hay
Seeheim (Germany)
10x42 Binoculars with internal stabilisation, handheld. Secondary a pinprick of light directly next to the overpowering primary. Slightly uncertain, but PA as seen confirmed afterwards in database. In stabilised 15x45 binoculars the pair is well split, primary white tending towards yellow, secondary substantially colder.
A physical double at a distance to us of 331 light years.
Christopher Hay
Seeheim (Germany)
15x60 On tripod. Well split. Primary very pale yellow, secondary very pale blue. A most striking pair.
Robert Zebahl
Leipzig (Germany)
70mm (22x) Striking, widely separated with noticeable difference in brightness. Moderate but beautiful color contrast: white-yellowish and grey-bluish.
Christopher Hay
Seeheim (Germany)
71mm (32x) Compact pair. Yellow, pale blue. Totally dominates 2.2° FOV.
Robert Zebahl
Leipzig (Germany)
102mm (28x) Grand sight! Pretty wide apart and unequal. A: mild orange, B: very nice light blue.
Stefan Loibl
Rosenheim (Germany)
102mm (164x) wide pair with nice colour contrast yellow/blue
Uwe Pilz
Leipzig (Germany)
105mm (28x) fahlblau und gelborange ../projects/double-stars/uwe-pilz/sketches/210330iotaCnc.jpg
Uwe Pilz
Leipzig (Germany)
105mm (144x) gelb-blaugrau ../projects/double-stars/uwe-pilz/sketches/iotaCnc.jpg
Sarah Gebauer
Germany
150mm (125x) bei 83x schon deutlich getrennt, der Farbkontrast ist gut zu sehen, er wird bei 125x noch stärker, ein zartes Blau und Gelb sind zu sehen ../projects/double-stars/sarah-gebauer/sketches/20200411%20i%20Cnc%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Iot Cnc: Pretty orange and pale blue, showpiece object.
★★★ 11 Hya, epsilon Hya SP1 AB 3m5 5m0 0.2'' 241° 2018 Hya 08h46m46.51s +06°25'07.70"
STF1273 AB-C 3m5 6m7 2.9'' 311° 2020
STF1273 AB-D 3m5 12m5 18.1'' 201° 2017
STF1273 AB-E 3m5 10m8 340.5'' 2015
STF1273 AB-F 3m5 10m4 406.5'' 265° 2015

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

Robert Zebahl
Leipzig (Germany)
70mm (133x) AB-C: Not split. Although a slight brightening was visible in the first diffraction ring, it could also have come from slight coma of the refractor.
Sarah Gebauer
Germany
100mm (200x) AB-C: ist ein heller Stern vom Hydra-Kopf, nicht zu trennen, vermutlich, weil die Komponente AB zu hell strahlt
Robert Zebahl
Leipzig (Germany)
102mm (160x) AB-C: 2020-03-27: The much fainter companion is well visible as an almost round knot directly at the diffraction ring of the primary component. Very nice sight. The seeing was mediocre (3/5).
Uwe Pilz
Leipzig (Germany)
105mm (200x) AB-C: bei 144x schwierig ../projects/double-stars/uwe-pilz/sketches/200323epsHya.jpg
Robert Zebahl
Leipzig (Germany)
152mm (150x) AB-C: 2020-03-27: The companion is immediately visible as a tiny star close to the primary component. Due to the chromatic aberration of the achromat, there is a slight tendency to outshine. Nevertheless a nice view. The seeing was mediocre (3/5).
Mark McCarthy
Fremont (California/USA)
508mm (533x) AB-C: Epsilon Hya A is bright orange-yellow, B is much fainter and a little blue, ~3". [SP 1 AB is 3.49/5.00 0.2" not seen]
STF1276 AB 8m3 8m6 12.7'' 353° 2017 Cnc 08h47m10.99s +11°09'34.20"
Sarah Gebauer
Germany
100mm (45x) das enge Pärchen bei 45x ist deutlich getrennt, die dritte Komponente landete unwissenderweise sogar auch auf der Zeichnung ../projects/double-stars/sarah-gebauer/sketches/STF1276.jpg
BU335 7m5 9m4 2.6'' 265° 2017 Hya 08h48m12.24s +02°34'48.40"
Sarah Gebauer
Germany
100mm (200x) auch bei 200x nicht zu trennen
Uwe Pilz
Leipzig (Germany)
105mm (200x) schwierig ../projects/double-stars/uwe-pilz/sketches/200323BU335.jpg
Mark McCarthy
Fremont (California/USA)
508mm (533x) 3 delta mag, well split ~3", very pleasing pair, white A and slightly red B
STF1291, 57 Cnc AB 6m1 6m4 1.5'' 310° 2019 Cnc 08h54m14.65s +30°34'45.80"
AB-C 5m5 9m2 54.6'' 204° 2015

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

Robert Zebahl
Leipzig (Germany)
70mm (133x) AB: Immediately apparent as a double star. Diffraction disks overlapping slightly ('8'). Difference in brightness visible.
Uwe Pilz
Leipzig (Germany)
105mm (144x) gelb ../projects/double-stars/uwe-pilz/sketches/57Cnc.jpg
Sarah Gebauer
Germany
150mm (125x) AB: sowohl bei 83x als auch bei 125x knapp vorm Trennen
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: 57 Cnc. Very nice pair, strong orange yellow colors, ~1 delta mag, bright, nice close split
★★ 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
STF1336 7m0 11m1 40.1'' 180° 2015 Hya 09h17m32.92s +00°33'17.80"
Uwe Pilz
Leipzig (Germany)
105mm (144x) sehr weit, kein Doppelstern-Eindruck ../projects/double-stars/uwe-pilz/sketches/200323STF1336.jpg
STF1333 6m6 6m7 1.8'' 50° 2018 Lyn 09h18m25.97s +35°21'51.30"
Robert Zebahl
Leipzig (Germany)
63mm (120x) At 93x seen as '8', at 120x split, but pretty tight with no visible difference in brightness.
Christopher Hay
Seeheim (Germany)
71mm (32x) Elongated with clear PA.
Uwe Pilz
Leipzig (Germany)
105mm (200x) fast gleich hell, beide gelblich, bei 66x schwierig ../projects/double-stars/uwe-pilz/sketches/stf1333.jpg
Christopher Hay
Seeheim (Germany)
180mm (113x) Hairfine split, evenly matched pair, rather attractive. No particular colour.
Mark McCarthy
Fremont (California/USA)
508mm (333x) Brilliant white pair, near equal, ~2" separation
STF1334, 38 Lyn AB 3m9 6m1 2.6'' 224° 2019 Lyn 09h18m50.64s +36°48'09.30"

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

Uwe Pilz
Leipzig (Germany)
60mm (198x) Aufhellung im ersten Ring
Robert Zebahl
Leipzig (Germany)
63mm (140x) Fainter companion only seen as permanent brightening on the first diffraction ring. ../projects/double-stars/robert-zebahl/sketches/2019-01-22_stf1334.jpg
Christopher Hay
Seeheim (Germany)
71mm (32x) Figure-8 with clear positions and delta-mags of components. Bluish-white.
Uwe Pilz
Leipzig (Germany)
105mm (288x) gelb, trennbar bei 66x ../projects/double-stars/uwe-pilz/sketches/38Lyn.jpg
Christopher Hay
Seeheim (Germany)
180mm (113x) Clean split, large delta-mag. Separation ca. 1.5 times that of nearby STF1333.
Mark McCarthy
Fremont (California/USA)
317mm (553x) 38 Lyn: Very bright A with 3x fainter dull white B, 3-4"
Mark McCarthy
Fremont (California/USA)
508mm (333x) 38 Lyn. A is a bright light yellow and B is a ~2 delta mag orange-yellow, well split and bright
STF1331 AB 8m5 8m7 0.9'' 153° 2017 UMa 09h20m46.02s +61°20'58.40"
AC 8m5 11m6 13.5'' 186° 2015
AD 8m5 14m5 19.4'' 117° 2015
AE 8m5 9m8 139.1'' 223° 2015
Robert Zebahl
Leipzig (Germany)
152mm (180x) 2020-04-13: The wide pair AE is already visible at 22x with a significant difference in brightness, but quite inconspicuous. A appeared white-yellowish, E rather orange. The close pair AB appeared immediately elongated at 129x, partly visible as '8'. At 180x, AB was just separated with a fine black space between them. The faint C component was only visible with averted vision. Best view at 180x. The even fainter D component was out of range. ../projects/double-stars/robert-zebahl/sketches/2020-04-13_stf1331.jpg
★★ STF1347 7m3 8m3 21.1'' 312° 2016 Hya 09h23m15.76s +03°30'05.00"
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-10: At 22x beautifully separated at moderate separation and difference in brightness. Primary component appeared white-bluish, companion slightly orange. At 44x the primary component looked more white-yellowish, the companion showed a clear tendency to orange.
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x ein auffälliges Sternpaar - Komponente B im Nordwesten ist gut abgesetzt erkennbar und ca. ein 3/4 Größenklasse schwächer - bei 20x rücken die beiden Sterne richtig schön zusammen und sind noch knapp getrennt erkennbar
Uwe Pilz
Leipzig (Germany)
105mm (88x) sehr schöner Farbkontrast ../projects/double-stars/uwe-pilz/sketches/200323STF1347.jpg
★★ STF1348 AB 7m5 7m6 2.0'' 314° 2018 Hya 09h24m28.48s +06°21'01.80"
Robert Zebahl
Leipzig (Germany)
70mm (100x) 2020-04-10: At 67x clearly elongated, at 80x clearly visible as figure '8'. At 100x a very small difference in brightness was to be guessed, at 133x visible. Near the double star STF 1355.
Uwe Pilz
Leipzig (Germany)
105mm (144x) Im selben Aufsuchfeld wie stf1355, ähnliche Erscheinung ../projects/double-stars/uwe-pilz/sketches/200323STF1348_55.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Very pretty half delta mag, ~2" pair, white. Sharp despite low declination
★★ STF1355 7m7 7m8 1.8'' 357° 2018 Hya 09h27m16.69s +06°13'59.00"

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

Robert Zebahl
Leipzig (Germany)
70mm (100x) 2020-04-10: At 67x clearly elongated, equally bright. At 80x detectable notch. At 100x and 133x clearly visible as figure '8'. Near the double star STF 1348.
Uwe Pilz
Leipzig (Germany)
105mm (144x) Im selben Aufsuchfeld wie stf1348, ähnliche Erscheinung ../projects/double-stars/uwe-pilz/sketches/200323STF1348_55.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Light yellow pair, near equal, very nice, ~2"
STF1349 7m5 9m0 19.2'' 166° 2015 UMa 09h31m09.89s +67°32'28.40"
René Merting
Drachhausen (Germany)
18x70 einfacher als der benachbarte Doppelstern STF 1350 - ordentlich getrennt - Komponente B ist 1 bis 1.5 Größenklassen schwächer
Christopher Hay
Seeheim (Germany)
60mm (25x) At 25x a wide split, substantial difference in brightness, B a fine pinprick of light. B appears light blue at first, but colour impression disappears quickly - an interesting visual effect repeated several times. According to Stelledoppie a true physical pair. Nice together with Struve 1350 in same FOV. A very fine double-double for very small apertures.
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-19: At 22x easy to separate with significant difference in brightness. The primary component appears whitish, the companion darker. At 44x, the primary component looks rather white-yellowish, the companion greyish.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x stehen beide Sterne bequem getrennt auseinander - Komponente B im Süden ist eine knappe Größenklasse schwächer und kupfergrau - ein schönes Doppel-Doppel zusammen mit STF1350 gut 47' weiter südsüdöstlich
Uwe Pilz
Leipzig (Germany)
105mm (88x) sichtbar bei 21x ../projects/double-stars/uwe-pilz/sketches/200316stf1349.jpg
René Merting
Drachhausen (Germany)
320mm (45x) bei 45x steht das Pärchen gut auseinander - Komponente B ist eine dreiviertel Größenklasse schwächer und wirkt grauweiß - A ist weiß mit einem zarten Stich ins Gelbe
★★ STF1350 AB 8m3 8m3 10.2'' 249° 2015 UMa 09h34m19.56s +66°47'42.30"
AC 8m3 9m2 131.0'' 216° 2015
René Merting
Drachhausen (Germany)
18x70 AB: ein sehr enger Doppelstern, äußerst knapp getrennt … und das auch nur in guten Momenten, ansonsten wirkt das Paar wie eine Ameise - beide Sterne sind gleich hell - ein FG-Tester für 18x
Christopher Hay
Seeheim (Germany)
60mm (25x) AB: Tight but nicely split at 25x. No colour whatsoever seen. A appears brighter than B, whereby the data do not support this – perhaps a product of different (yet not seen) colouration? According to Stelledoppie not a physical pair. Attractive together with Struve 1349 in same field of view.
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-19: At 22x A & B equally bright and still pretty close together. Component C is visible at a much greater distance. At 44x, A & B show a color difference: orange, white-bluish.
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x ein schönes enges Paar zweier gleich heller Sterne, knapp getrennt - STF1350 AB bildet mit vier ähnlich hellen Sternen westlich ein Muster, ähnlich einer Sense
AC: bei 32x bildet STF1350 AB mit vier ähnlich hellen Sternen westlich ein Muster, ähnlich einer Sense - der erste der vier Sterne bzw. der nächststehende Stern südsüdwestlich mit mehr als zehnfachem Abstand AB ist Komponente C, er ist schätzungsweise eine halbe Größenklasse schwächer
Uwe Pilz
Leipzig (Germany)
105mm (88x) AB: trennbar bei 21x. Fast gleichell, aber deutlicher Farbkontrast, lohnend. ../projects/double-stars/uwe-pilz/sketches/200316stf1350.jpg
Robert Zebahl
Leipzig (Germany)
152mm (100x) At 22x, all three components are already visible, with A & B still standing quite close together. Component C is less prominent. At 69x and 100x, the pair AB shows a nice color contrast: The eastern component mostly appeared in a slightly shiny orange, while the other component appeared more white-bluish. During the observation, however, the colors changed between both components. At the time of observation, the pretty bright comet C/2019 Y4 Atlas was also in the same field of view - a great scene! Note to the sketch: The positions of the stars to each other do not exactly match, also the alignment of the pair AB to C. ../projects/double-stars/robert-zebahl/sketches/2020-03-18_stf1350_c2019_y4_atlas.jpg
Christopher Hay
Seeheim (Germany)
180mm (113x) AB: Immediately striking in 32x71 superfinder wihle panning through the area, a very evenly matched pair well split at that power. Closer inspection with the 7-inch at 113x reveals a fine blue-orange colour contrast between components A and B.
René Merting
Drachhausen (Germany)
320mm (45x) AB: bei 45x ein schönes enges Paar zweier gleich heller Sterne, beide strahlen weiß
★★ STF1424, gamma Leo, 41 Leo, Algieba AB 2m4 3m6 4.7'' 127° 2020 Leo 10h19m58.35s +19°50'29.40"

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

Robert Zebahl
Leipzig (Germany)
55mm (38x) At 38x split, but very tight with noticeable difference in brightness. At 56x and higher beautiful view of both components, which seemed to have similar colors. ../projects/double-stars/robert-zebahl/sketches/2019-02-09_gamma_leo.jpg
Robert Zebahl
Leipzig (Germany)
55mm (59x) Very nice unequal double. A appeared yellow-orange, B rather white-bluish. ../projects/double-stars/robert-zebahl/sketches/2019-03-09_gamma_leo.jpg
Christopher Hay
Seeheim (Germany)
60mm (58x) At 25x Algieba is already very elongated. At 58x a sliver of dark between the components, with clear brightness difference. At 70x split becomes more stable, but view not so pleasing as at 58x. Both components display vivid orange.
Robert Zebahl
Leipzig (Germany)
70mm (100x) At 67x still a relatively close pair, but well separated with quite a clear difference in brightness. At 100x easy to separate and visible color difference: A yellowish to slightly orange, B white-yellowish.
Robert Zebahl
Leipzig (Germany)
102mm (125x) Very nicely separated with wonderful contrast in brightness and color. Primary component slightly orange, companion yellowish.
Stefan Loibl
Rosenheim (Germany)
102mm (164x) very bright double star, slight colour contrast
Uwe Pilz
Leipzig (Germany)
105mm (120x) schon bei 37x sehenswert; trennbar bei 55x; orange-blauweiß
Robert Zebahl
Leipzig (Germany)
120mm (66x) At 48x easily seen as double star. It appeared as '8'. At 66x pretty tight with visible difference in brightness.
Winfried Kräling
Marburg (Germany)
127mm (250x) 08.04.2018: merklicher Helligkeitsunterschied, A = gelb-orange, B = gelb-orange ../projects/double-stars/winfried-kraeling/sketches/180408_04_Gamma%20Leo.jpg
Sarah Gebauer
Germany
150mm (83x) bei 83x sauber getrennt, ein leichter Farbunterschied (Weiß und helles Gelb) sichtbar ../projects/double-stars/sarah-gebauer/sketches/20200411%20Gamma%20Leo%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Algieba: Bright yellow and yellow-orange pair, 1 delta mag, 4-6"
René Merting
Drachhausen (Germany)
320mm (240x) bei 240x sehe ich zwei ordentlich getrennte Sterne (naja, nicht wirklich Sterne, sondern wild zappelnde Glitzerbällchen) - Komponente A strahlt in einem zarten Gelb, B ist weiß - zurück auf 144x sehe ich nur ein Stäbchen mit leichter Einschnürung, so wild tanzen die Sterne
Mark McCarthy
Fremont (California/USA)
508mm (333x) Algieba. Very bright, A is yellow-orange and B is a blazing white orange, like a fire
STTA104 7m2 7m3 209.0'' 287° 2013 LMi 10h24m22.19s +34°10'35.00"
Christopher Hay
Seeheim (Germany)
7x45 Handheld. Wide, striking matched pair. Nice together with triangle of 27/28/30 LMi, and thus also easy to find. HJL1057 also in field to southwest.
Delicate colour contrast in the triangle makes this a very attractive field: 30 LMi is yellowish-white, 28 reddish-white, 27 LMi colder.
In 15x45 binoculars STTA104 becomes almost too wide to feel it is a double, but the colour contrasts in the triangle become clearer.
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-11: Very wide pair of similarly bright components, unremarkable color. The double star stands close to the stars 27, 28 & 30 LMi and is probably more appealing in smaller binoculars. ../projects/double-stars/robert-zebahl/sketches/2020-04-11_stta104.jpg
STF1466, 35 Sex AB 6m2 7m1 6.8'' 240° 2019 Sex 10h43m20.91s +04°44'51.60"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein wunderschönes dicht stehendes Pärchen, knapp getrennt - Helligkeitsunterschied eine halbe Größenklasse - leichter Farbkontrast, A leicht gelblich
Robert Zebahl
Leipzig (Germany)
102mm (28x) Very nice view. At 28x obviously unequal and easy to split. A appeared slightly orange. At 86x B appeared grey-blue. ../projects/double-stars/robert-zebahl/sketches/2019-04-06_35_sex.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Orange and a little blue, wide separation, bright, half a delta mag.
Mark McCarthy
Fremont (California/USA)
508mm (333x) 35 Sex. Easy, wide, yellow-orange pair, ~2 delta mag. AC much further separated and 1 delta mag. [SkyTools showed a close CD pair: Hint of elongation with 533x, elongation is larger but more hazy at 1067x, but not resolved into stars -- but this one not in Stelle Doppie.]
42 LMi S612 AB 5m3 7m8 196.4'' 174° 2019 LMi 10h45m51.91s +30°40'56.60"
ARN3 AC 5m3 8m3 424.6'' 94° 2013
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. Panning around in the area the triangle of ABC is immediately striking. Component A cold-white, B reddish, C no particular colour.
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-11: Wide, striking triple system, which can be well observed with binoculars. A: quite bright, rather white, B: slightly orange, C: tending to orange. ../projects/double-stars/robert-zebahl/sketches/2020-04-11_42_lmi.jpg
Mark McCarthy
Fremont (California/USA)
80mm (13x) AB: Very widely separated, split in finder (196"!). white A with a slightly red B
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: 42 LMi: Very bright white and 3 delta mag orange B, very wide separation.
S617 6m2 8m7 35.2'' 179° 2017 Leo 10h53m24.96s -02°15'18.80"
René Merting
Drachhausen (Germany)
18x70 unauffällig - Komponente B ist ordentlich getrennt südlich von A erkennbar - Helligkeitsunterschied eine Magnitude (2.49 mag lt. Stelle Doppie!) - A reinweiß, B grau
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-03-31: Clearly separated with distinct difference in brightness. Color wise unremarkable. Nearby there is a brighter star. ../projects/double-stars/robert-zebahl/sketches/2020-03-31_s617.jpg
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ist B im Süden von A mit ordentlich Abstand erkennbar - A ist warmweiß, leicht gelblich, die deutlich schwächere Komponente B wirkt farblos - das Sternpaar ist interessant in Kombination mit dem unmittelbar nordöstlich stehenden gelblich strahlenden Stern Rho? Leo
Mark McCarthy
Fremont (California/USA)
317mm (340x) Yellow A, blue B, wide separation
STF1487, 54 Leo 4m5 6m3 6.8'' 112° 2019 Leo 10h55m36.80s +24°44'59.00"
Robert Zebahl
Leipzig (Germany)
55mm (27x) At 27x split, but very tight with noticeable difference in brightness. At 71x easy to separate. No visible color difference.
Robert Zebahl
Leipzig (Germany)
70mm (67x) 2021-04-13: At 67x beautifully separated with clearly visible difference in brightness. Very attractive is the subtle color difference: light yellow & light blue. At 133x the color of the companion is a bit more pale: gray-blue. The primary component still shines in a beautiful light yellow.
Winfried Kräling
Marburg (Germany)
127mm (250x) 13.03.2017: Hauptkomponente gelblich, Begleiter bläulich, deutlicher Helligkeitsunterschied. Ebenfalls bei V=60x getrennt. ../projects/double-stars/winfried-kraeling/sketches/170313_03_54%20Leo.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Bright white pair (4.5, 6.3) wide sep (6")
Mark McCarthy
Fremont (California/USA)
508mm (333x) 54 Leo. Brilliant pair, light white-yellow stars, ~2 delta mag, wide
STF1517 & BU1431 STF1517 AB 7m5 8m0 0.7'' 314° 2017 Leo 11h13m40.99s +20°07'43.30"
BU1431 AB-C 7m5 10m8 246.1'' 97° 2015

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

Sarah Gebauer
Germany
100mm (200x) STF1517 (AB): die Komponenten AB und C lassen sich natürlich problemlos bei geringer Vergrößerung trennen, für A und B reichen auch 200x nicht aus (Beobachtungsversuch erfolgte ohne vorherige Recherche, denn 0,7'' schafft mein Refraktor nicht)
Robert Zebahl
Leipzig (Germany)
102mm (187x) STF1517 (AB): 2020-03-28: At 187x the double star immediately appears elongated, but without notching. On closer observation, the slight difference in brightness could be detected. Not better at higher magnifications. Observation at quite good seeing (4/5).
Uwe Pilz
Leipzig (Germany)
105mm (200x) STF1517 (AB): länglich ../projects/double-stars/uwe-pilz/sketches/200327stf1517.jpg
Robert Zebahl
Leipzig (Germany)
152mm (225x) STF1517 (AB): 2020-03-27: Clearly elongated. In some moments the double star appeared notched with a small difference in brightness. Observation at moderate seeing (3/5).
Mark McCarthy
Fremont (California/USA)
317mm (340x) STF1517 (AB): Very tight, hair split small orange stars of equal magnitude. Wow!
Mark McCarthy
Fremont (California/USA)
508mm (533x) STF1517 (AB): Touching disks with 333x, clean slit with 533x, ~0.5" separation, Yellow-orange stars, near equal
★★ 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
STF1536, iota Leo, 78 Leo AB 4m1 6m7 2.2'' 93° 2019 Leo 11h23m55.37s +10°31'46.90"
AB-C 4m1 11m1 332.1'' 346° 2015

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

Robert Zebahl
Leipzig (Germany)
70mm (133x) AB: 2020-03-28: The companion was well visible as brightening on the diffraction ring of the primary component. Sketch see observation with my 102mm refractor.
Sarah Gebauer
Germany
100mm (200x) AB: selbst bei 200x nur manchmal getrennt, eher schwierig mit Amiciprisma
Robert Zebahl
Leipzig (Germany)
102mm (125x) AB: 2020-03-28: At 125x clearly separated. A very beautiful sight! The companion was visible as almost round brightening close to the first diffraction ring of the primary component. The diffraction ring itself appeared very fine. At 224x also a very nice sight with a clear diffraction ring and the companion, which now appeared roundish. ../projects/double-stars/robert-zebahl/sketches/2020-03-28_iota_leo_stf1536.jpg
Mark McCarthy
Fremont (California/USA)
317mm (340x) AB: Quite close, very bright yellow white A and brownish B, split in A's diffraction ring
Mark McCarthy
Fremont (California/USA)
508mm (333x) AB: Iota Leo. Light orange A and a richer orange B, ~2 delta mag, ~2" separation
★★ STF1540, 83 Leo AB 6m5 7m5 28.6'' 146° 2019 Leo 11h26m45.32s +03°00'47.20"
Stefan Loibl
Rosenheim (Germany)
10x50 clearly split, little difference in magnitude
Christopher Hay
Seeheim (Germany)
10x56 On tripod. Neat split. Attractive 6.3° FOV with a sprinkling of several 5- to 7-mag stars to the south. Tau Leo widely split directly to southeast.
In 15x60 on tripod well split, component A slightly orange, forms a fine double-double with Tau Leo.
83 Leo is a physical double at a distance to us of only 58 light years.
Robert Zebahl
Leipzig (Germany)
16x70 2021-03-02: Splendid sight together with the double star tau Leo as well as 82 Leo. Beautiful star field. 83 Leo very nicely separated with moderate difference in brightness. Yellowish orange & slightly orange.
René Merting
Drachhausen (Germany)
18x70 ein ordentlich getrenntes und dennoch schön eng stehendes Pärchen - Komponente A ist leicht gelblich, Komponente B im SO ist eine dreiviertel Magnitude schwächer und grauweiß
Robert Zebahl
Leipzig (Germany)
55mm (16x) Wonderful double with slight color contrast in a very nice field. Together with tau Leo stunning view. Slightly unequal. A appeared white-yellowish, B rather grey-bluish. ../projects/double-stars/robert-zebahl/sketches/2019-03-09_83_leo_tau_leo.jpg
Mark McCarthy
Fremont (California/USA)
80mm (13x) Finder split, in same field as Tau.
Mark McCarthy
Fremont (California/USA)
317mm (340x) Yellow A and reddish B wide separation.
René Merting
Drachhausen (Germany)
320mm (72x) bei 72x steht das Paar zwar weit auseinander, es wirkt aber trotzdem gut zusammengehörend - Komponente B im SO ist eine dreiviertel Magnitude schwächer
★★ STFA19, 84 Leo, tau Leo AB 5m0 7m5 89.2'' 181° 2019 Leo 11h27m56.23s +02°51'22.50"
Christopher Hay
Seeheim (Germany)
7x50 On tripod. Comfortably split. Component A is mildly orangish-yellow.
Can't quite eke out 83 Leo's secondary (NELM 5m0, elevation 40°).
Christopher Hay
Seeheim (Germany)
15x45 Binoculars with internal stabilisation, handheld. Wide pair. Component A dull golden-yellow, component B seems bluish. Attractive.
In 15x60 on tripod very wide. Component A very mild orange, B grey-blue. Fine sight in 3.3° FOV together with well-split 83 Leo.
Robert Zebahl
Leipzig (Germany)
16x70 2021-03-02: Splendid sight together with the double star 83 Leo as well as 82 Leo. Beautiful star field. Tau Leo beautifully separated with significant difference in brightness. Yellowish & bluish.
Robert Zebahl
Leipzig (Germany)
55mm (16x) Wonderful double with slight color contrast in a very nice field. Together with 83 Leo stunning view. Noticeable unequal. A appeared white-yellowish with a hint of orange, B grey-bluish. ../projects/double-stars/robert-zebahl/sketches/2019-03-09_83_leo_tau_leo.jpg
Mark McCarthy
Fremont (California/USA)
80mm (13x) Finder split, the A star is prismatic in color effects, bluish B
Mark McCarthy
Fremont (California/USA)
317mm (340x) Bright yellow A, bluish B, very widely separated
STF1547, 88 Leo AB 6m3 9m1 15.7'' 330° 2020 Leo 11h31m44.94s +14°21'52.20"

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

Robert Zebahl
Leipzig (Germany)
55mm (42x) Well split with moderate distance. Primary component appeared white-yellowish. Pretty unequal pair.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x erscheint Komponente B nordwestlich von A etwas mehr als knapp getrennt ganz schwach, bestimmt 3 Größenklassen Helligkeitsunterschied - Komponente A warmweiß, B ist grau
Sarah Gebauer
Germany
100mm (45x) fein, aber gut getrennt, die südliche Komponente ist deutlich heller, die nordwestliche zeigt sich als ganz schwacher Punkt
Uwe Pilz
Leipzig (Germany)
105mm (88x) gelb und violett ../projects/double-stars/uwe-pilz/sketches/210427_88Leo.jpg
Gerd Kohler
Langenzenn (Germany)
254mm (76x) Der Doppelstern ist getrennt.Bläulich-weiß - orange-leicht rötlich. Etwas schwächerer Begleiter.
Mark McCarthy
Fremont (California/USA)
317mm (340x) 88 Leonis: A favorite! Yellow and blue pair, wide
René Merting
Drachhausen (Germany)
320mm (45x) bei 45x ein schönes enges Sternpaar, ordentlich getrennt - Komponente A strahlt hellgelb, B ist deutlich schwächer und empfiehlt sich mit einem Kupferton - ein schöner Farbkontrast
★★★ STF1552, 90 Leo AC 6m3 9m8 63.4'' 235° 2018 Leo 11h34m42.50s +16°47'48.90"
AB 6m3 7m3 3.1'' 209° 2018
Robert Zebahl
Leipzig (Germany)
55mm (42x) AB: A and B very tight and unequal. Much fainter component C very wide apart. All components almost in line. Very nice view. ../projects/double-stars/robert-zebahl/sketches/2019-03-09_90_leo.jpg
Sarah Gebauer
Germany
100mm (136x) lange Zeit nach der ersten Beobachtung nun auch die Komponenten A und B getrennt, was bei 136x gut gelingt ../projects/double-stars/sarah-gebauer/sketches/90%20Leo2.jpg
René Merting
Drachhausen (Germany)
100mm (142x) AB: bei 64x wirken die Komponenten A und B wie eine 8 - bei 142x dann die Gewissheit, B ist jetzt allein erkennbar, vom Positionswinkel südwestlich, aber etwas südlicher als C - Helligkeitsunterschied eine dreiviertel Größenklasse - B wirkt hellorange gegen die weiße Komponente A
AC: bei 32x ist Komponente C ziemlich weit südwestlich von A erkennbar - Helligkeitsunterschied mindestens 2.5 Größenklassen
Uwe Pilz
Leipzig (Germany)
105mm (88x) bläulich und violett ../projects/double-stars/uwe-pilz/sketches/210427_90Leo.jpg
Sarah Gebauer
Germany
150mm (30x) AB: einfach zu trennen, erst bei 83x, dann auch bei 30x, sehr feine Punkte mit sichtbarem Helligkeitsunterschied ../projects/double-stars/sarah-gebauer/sketches/20200415%2090%20Leo%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
317mm (170x) AB: 90 Leonis, a close but easily split pair at 170x, a yellow-white A and a bluish-white B.
Mark McCarthy
Fremont (California/USA)
508mm (333x) AB: 90 Leo. Blazing white pair, ~1 delta mag, ~3"
STF1555 & HJ503 STF1555 AB 6m4 6m8 0.8'' 149° 2016 Leo 11h36m17.94s +27°46'52.70"
HJ503 AB-C 5m8 11m2 22.5'' 156° 2016

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

Frederik Wanink
Itterbeck (Germany)
254mm (640x) STF1555 (AB): blickweise gerade eben trennbar ../projects/double-stars/frederik-wanink/sketches/STF1555.jpg
Mark McCarthy
Fremont (California/USA)
317mm (443x) STF1555 (AB): Nice! AB tight hair-split white pair, with fainter & wide separated AB-C in a row to the east.
Mark McCarthy
Fremont (California/USA)
317mm (443x) HJ503 (AB-C): Nice! STF 1555AB tight hair-split white pair, with fainter & wide separated C in a row to the east.
Mark McCarthy
Fremont (California/USA)
508mm (553x) STF1555 (AB): Hairline split at 333x, clear split with 533x, very close ~0.5", bright. Part of plus one
STF1559 6m8 8m0 2.0'' 326° 2019 UMa 11h38m49.11s +64°20'49.40"
Robert Zebahl
Leipzig (Germany)
70mm (133x) 2020-04-14: Two clearly visible, slightly touching diffraction disks. The fainter companion appeared somewhat more diffuse. Occasionally the double star appeared separated. ../projects/double-stars/robert-zebahl/sketches/2020-04-14_stf1559.jpg
STF1565 7m3 8m4 22.2'' 304° 2017 Leo 11h39m36.50s +18°59'48.30"
Christopher Hay
Seeheim (Germany)
15x60 Well split. Primary warmer in tone, secondary colder. No visual competition whatsoever in 3.3° FOV, making the delicate pair rather charming.
A physical double at the substantial distance to us of 2175 light years.
Robert Zebahl
Leipzig (Germany)
16x70 2021-03-02: Moderately bright, clear difference in brightness, attractive separation, striking. The primary component shines in a beautiful yellow with a touch of orange, the tiny companion just greyish.
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2021-04-21: At 22x very nicely separated with moderate difference in brightness. White-yellowish & grey-blue. At 44x similar color impression: slightly yellowish & slightly bluish.
Sarah Gebauer
Germany
100mm (45x) weit und deutlich getrennt, die westliche Komponente minimal schwächer als die östliche zu sehen
Uwe Pilz
Leipzig (Germany)
105mm (21x) gelb und rot ../projects/double-stars/uwe-pilz/sketches/210427STF1565.jpg
BU603 AB 6m0 8m5 1.0'' 329° 2019 Leo 11h48m38.71s +14°17'03.20"

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

Uwe Pilz
Leipzig (Germany)
105mm (200x) sehr schwierig ../projects/double-stars/uwe-pilz/sketches/210330BU603.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) nicht getrennt
Mark McCarthy
Fremont (California/USA)
203mm (533x) Suspected at 205x and 333x but needed higher magnification to see it. B is a very small point, with seeing, in the first diffraction ring. ~1" and ~3 delta mag
STF1579, 65 UMa AB-C 6m7 8m3 3.9'' 43° 2019 UMa 11h55m05.74s +46°28'36.60"
AB-D 6m7 7m0 62.5'' 114° 2018
Robert Zebahl
Leipzig (Germany)
8x40 AB-D: 2020-04-05: Immediately conspicuous in the field. Medium bright double star with slightly uneven components. Western component AB appeared slightly orange, component D tended to be bluish.
Robert Zebahl
Leipzig (Germany)
55mm (27x) AB-D: Easy to separate with large distance and very small difference in brightness. The D component showed a bluish tint, the lighter one (AB) a slightly yellowish tint. At higher magnification also the faint C component is visible.
Robert Zebahl
Leipzig (Germany)
55mm (83x) 2019-02-09: AB, C & D easy to split, but the faint C component only appeared as a tiny star. To the south there is the brighter D component. ../projects/double-stars/robert-zebahl/sketches/2019-02-09_65_uma.jpg
Robert Zebahl
Leipzig (Germany)
../projects/double-stars/robert-zebahl/photographs/2020-04-06_65_uma.jpg
STF1600 7m6 8m3 7.8'' 92° 2015 UMa 12h05m34.42s +51°55'52.20"
Robert Zebahl
Leipzig (Germany)
70mm (44x) 2020-04-19: Uneven pair. At 22x medium bright and still pretty tight. At 44x beautiful sight: pale orange, grey-bluish.
Sarah Gebauer
Germany
100mm (73x) zweifarbig, bei 73x sauber getrennt, wenn auch nadelfein, die westliche Komponente ist orange, die östliche blau ../projects/double-stars/sarah-gebauer/sketches/STF%201600.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Pretty orange and blue pair, 8-9 mag, 1.5 delta mag, wide separation ~10"
STF1662 7m8 9m8 19.3'' 243° 2017 UMa 12h35m48.64s +56°34'42.40"
Sarah Gebauer
Germany
100mm (73x) Teil eines Dreiecks, so schwach, dass man sie kaum sieht ../projects/double-stars/sarah-gebauer/sketches/STF%201662.jpg
★★★ STF1670, gamma Vir, 29 Vir, Porrima AB 3m5 3m5 3.0'' 357° 2020 Vir 12h41m39.60s -01°26'57.90"

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

Christopher Hay
Seeheim (Germany)
15x60 28 February 2021 at 3" separation: Very slight elongation. PA estimated at 5° (thus only 9° off, which seems fairly precise to me considering the low power of 15x and the minimal elongation, both of which make PA estimation difficult).
Intentionally flashed the eyes on the almost full Moon directly prior to observation in order to enhance acuity. Compared the sight of Porrima repeatedly with that of similarly bright Epsilon Vir (Vindemiatrix) to check whether the elongation is perhaps an artefact of the bincolulars or of my eyes, but no elongation seen there.
Robert Zebahl
Leipzig (Germany)
16x70 2021-05-23: Not even close to appear as a double star. The components are just too bright, the separation too small.
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 (44x) 2021-05-26: At full aperture Porrima appears almost separated at 44x. The two diffraction disks are well visible. At 31x it is difficult to see any elongation at all.
At 40mm aperture Porrima can be seen clearly elongated already at 31x, from 67x it appears as an '8'. At only 22x Porrima is not visible as a double star.
Robert Zebahl
Leipzig (Germany)
70mm (104x) 2019-05-04: At 47x clearly visible as '8', at 73x split with almost touching diffraction disks. At 104x clearly separated, equally bright and pretty close together. The gap was smaller than the diameter of the diffraction disk.
Robert Zebahl
Leipzig (Germany)
102mm (125x) 2019-05-01: Extremely nice double star! Equally bright and relatively close together. Both components appeared yellowish-white.
Uwe Pilz
Leipzig (Germany)
105mm (200x) weiß-weiß, die nördliche Komponente ist eine Winzigkeit heller
Winfried Kräling
Marburg (Germany)
127mm (146x) 21.04.2018: Bei V=100x erscheint dieser orangefarbene Doppelstern bereits als „8“. Bei V=146x ist Porrima voll getrennt. ../projects/double-stars/winfried-kraeling/sketches/180421_03_Gamma%20Vir.jpg
Sarah Gebauer
Germany
150mm (166x) die 2,8'' entfernten Komponenten A und B konnten haarscharf bei 83x und 166x getrennt werden, beide strahlen gleich hell als ganz dichte Glanzpünktchen; Komponenten E und F wurden gesehen, C und D allerdings nicht; bei 83x waren AB ganz knapp nicht mehr voneinander getrennt ../projects/double-stars/sarah-gebauer/sketches/20200416%20Gamma%20Vir%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
317mm (170x) Porrima. Very pretty yellow-white, near equal, close split at 170x. Star disks improved with apodizing mask.
STF1685 AB 7m3 7m8 16.0'' 202° 2018 Com 12h51m54.80s +19°10'19.90"
René Merting
Drachhausen (Germany)
18x70 ein schicker FG-Doppelstern - ein enges Paar mit der leicht schwächeren Komponente B im Süden - schwacher Farbkontrast, der wieder mal zwischen den Sternen hin und her zu springen scheint
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-04: Lovely sight! Beautifully separated with little difference in brightness. Together with two other brighter stars the double star forms an almost right-angled triangle. At 44x the primary component appears in pale orange, the companion rather grey-bluish. ../projects/double-stars/robert-zebahl/sketches/2020-04-04_stf1685.jpg
Christopher Hay
Seeheim (Germany)
125mm (64x) Wide split. Component A bluish, B warmer. Well-matched pair.
A physical double at a distance to us of 722 light years.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Brighter white A, 0.5 delta mag B, pretty wide separation.
★★ STF1692, 12 CVn, alpha CVn, Cor Caroli AB 2m9 5m5 19.5'' 230° 2018 CVn 12h56m01.67s +38°19'06.20"
Christopher Hay
Seeheim (Germany)
11x80 Difficult, but definitely split. Interesting to compare directly with Zeta UMa (Alcor): the latter very close to separation, but not quite there.
Robert Zebahl
Leipzig (Germany)
70mm (22x) Beautiful view. Clearly unequal with nice angular distance. Primary component appeared in pale yellow, companion silvery-white.
Christopher Hay
Seeheim (Germany)
76mm (17x) Clearly split. Primary slightly yellowish. Secondary too close to get a clear colour impression, but seems grey-blue in good moments.
René Merting
Drachhausen (Germany)
100mm (32x) bei 64x ein auffälliger Doppelstern - A ist gleißend weiß, B im Südwesten ist 1.5 Größenklassen schwächer (2.67 mag lt. Stelle Doppie, schon zum zweiten Mal vertan hier)
Uwe Pilz
Leipzig (Germany)
105mm (66x) blauweiß-orange, trennbar bei 16x
Uwe Pilz
Leipzig (Germany)
105mm (200x) schon bei 26x getrennt ../projects/double-stars/uwe-pilz/sketches/CorCaroli.jpg
Robert Zebahl
Leipzig (Germany)
114mm (28x) Well split with big difference in brightness.
Sarah Gebauer
Germany
150mm (83x) deutlicher Helligkeitsunterschied, sehr einfach zu trennen ../projects/double-stars/sarah-gebauer/sketches/20200415%20Alpha%20CVn%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
203mm (205x) Cream white and light canary yellow. Well separated, 2 delta mag.
Mark McCarthy
Fremont (California/USA)
203mm (205x) Cor Caroli: Cream white and light canary yellow. Well separated, 2 delta mag.
Gerd Kohler
Langenzenn (Germany)
254mm (76x) Weiß-leicht bläulich - leicht orange rötlich. Kleiner Helligkeitsunterschied.
Mark McCarthy
Fremont (California/USA)
317mm (71x) Cor Caroli. Cream and bluish, use low power to fit STF 1688 & STF 1702 in the same field
René Merting
Drachhausen (Germany)
320mm (72x) bei 72x ein schönes Pärchen - A ist weiß - B zeigt sich gut getrennt südwestlich von A, ist gut 1.5 Größenklassen schwächer (2.67 mag laut Stelle Doppie) und mit einem leichten Stich ins gelbliche (warmweiß) - zurück auf 20x eine ungleiche 8, bei 32x knapp getrennt
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/Cor%20Caroli.jpg
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/STF%201692.png
STF1740 7m1 7m4 25.6'' 75° 2018 Vir 13h23m39.16s +02°43'24.00"
Stefan Loibl
Rosenheim (Germany)
10x50 close double star for binoculars, clearly split, component A slightly reddish
René Merting
Drachhausen (Germany)
18x70 ein auffälliges, schön eng zusammen stehendes Sternpaar - Komponente B im Osten ist nur knapp schwächer
Robert Zebahl
Leipzig (Germany)
70mm (33x) Easy to separate, slightly unequal with moderate angular distance. A: pale orange, B: color not clearly perceptible.
Uwe Pilz
Leipzig (Germany)
105mm (88x) gelb und orange, der westliche ist einen Hauch heller. Schon auffallend bei 2x, sehr schön bei 88x ../projects/double-stars/uwe-pilz/sketches/200516STF1740.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) hair split equal white pair. Suspected elongation at 205x but needed 333x to split. 667x too much power given the conditions.
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/STF%201740.png
★★ zeta UMa STF1744, 79 UMa, Mizar AB 2m2 3m9 14.6'' 154° 2019 UMa 13h23m55.42s +54°55'31.50"
STF1744, Mizar & Alcor AC 2m2 4m0 707.7'' 72° 2017
SMR4 AD 2m2 7m6 492.8'' 102° 2017
Christopher Hay
Seeheim (Germany)
naked eye AC, Mizar/Alcor: After seeing the two stars separated for the first time under clear corona skies in spring 2020, this became a regular and easy sighting. Naked-eye star splitting is a skill that develops rapidly with practice. Mizar and Alcor are wide apart with my 60-year-old eyes, and occasionally Alcor appears slightly bluish.
Christopher Hay
Seeheim (Germany)
7x50 On tripod. Mizar (AB) is an uneven figure-8, the smaller circle of the 8 pointing to an estimated PA of 150°. Without knowing that this is a double star one might think the binoculars have collimation issues, but Epsilon UMa displays a perfect little Airy disk.
Alcor (C) appears bluish, Mizar creamy-white.
D seems reddish.
René Merting
Drachhausen (Germany)
8x30 AC: ein ultraweit getrenntes Pärchen - Komponente C im NO schätze ich eine Größenklasse schwächer ein (1.78 mag laut stelle Doppie) - Komponente D (SMR4) ist östlich der beiden Sterne ganz schwach erkennbar, D steht dabei näher zu C
Robert Zebahl
Leipzig (Germany)
8x40 AB: 2020-04-05: Even with tripod not separable.
Christopher Hay
Seeheim (Germany)
10x56 AB: On tripod. Touching stars with a sliver of black in-between in good moments. Very aesthetic 6.3° field of view together with a little star group around 82 UMa.
Christopher Hay
Seeheim (Germany)
12x24 AB: On tripod. Very finely split, but stable.
Christopher Hay
Seeheim (Germany)
15x45 AB: Binoculars with internal stabilisation, handheld. AB nicely split with strong difference in magnitudes between A and B, very pretty.
Christopher Hay
Seeheim (Germany)
42mm (12x) AB: At 6.3x substantially elongated with clear positions of the brighter/darker components. At 10.7x a very stretched figure-eight tantalisingly close to popping apart. At 12x cleanly split with a stable sliver of black between A and B.
Robert Zebahl
Leipzig (Germany)
70mm (10x) AB: 2020-04-12: Observation from city with a 70/400mm ED refractor, for which I made aperture masks from 10mm to 60mm. Goal was to find the minimum magnification for a successful split.

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

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

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

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

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

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

10mm: At 10x the companion appears very faint. Separation possible, but extremely tight. At 12.5x reasonably well separated.
Robert Zebahl
Leipzig (Germany)
70mm (22x) AB: 2020-04-11: At 12x no separation possible, because the bright primary component outshines the companion. At 22x clearly separated, but still quite close together.
Robert Zebahl
Leipzig (Germany)
102mm (28x) First pastel sketch (Pitt pastel by Faber-Castell) of a double star on black paper, where also the halos were sketched around the stars. The stars themselves were redrawn with an Edding (Edding 1500, Soft Pastel white). The sketch shows the components A to D. ../projects/double-stars/robert-zebahl/sketches/2019-08-14_mizar_alcor.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) AB: mit viel Schwarz zwischen den Beugungsscheiben (1“9) ../projects/double-stars/uwe-pilz/sketches/zetaUMa.jpg
Jörg S. Schlimmer
Germany
127mm (87x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Alkor-Mizar_ausschnitt_filtered.jpg
Sarah Gebauer
Germany
150mm (83x) AB: einfacher, aber sehr schöner Doppelstern, Komponenten A und B mit 14,4'' Abstand stehen mit schönen Feldsternen zusammen im Bild ../projects/double-stars/sarah-gebauer/sketches/20200409%20Zeta%20UMa%20DSk.jpg
Werner E. Celnik
Rheinberg (Germany)
120mm ../projects/double-stars/werner-celnik/photographs/zetaUMa%202001-07-01%202130UT%20Refr_120-2000%20Fuji100%203s%20A8076%20kl.jpg
Robert Zebahl
Leipzig (Germany)
../projects/double-stars/robert-zebahl/photographs/2020-04-06_zeta_uma.jpg
STF1757 AB 7m8 8m8 1.7'' 143° 2018 Vir 13h34m16.38s -00°18'49.80"

../images/binary-star-orbits/STF1757-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (200x) schwierig ../projects/double-stars/uwe-pilz/sketches/200516STF1757.jpg
Mark McCarthy
Fremont (California/USA)
203mm (205x) Close, ~2", a dull orange, ~1.5 delta mag.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Orange-yellow, half a delta mag, pretty, ~1.5"
25 CVn STF1768 AB 5m0 7m0 1.6'' 93° 2019 CVn 13h37m27.70s +36°17'41.40"
STF1768 AC 5m0 11m6 214.3'' 321° 2015
KZA73 AD 5m0 13m0 335.6'' 92° 2015
KZA73 AE 5m0 12m7 369.5'' 139° 2015
KZA73 AF 5m0 9m4 437.3'' 118° 2015

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

Robert Zebahl
Leipzig (Germany)
60mm (160x) AB: 2020-03-16: 102/1122mm ED refractor stopped down to 60mm. The diffraction ring of the primary component is virtually invisible. The companion appears only in few moments as an extremely faint, elongated brightening in the diffraction ring. Very difficult. Telescope should be in very good optical condition!
Robert Zebahl
Leipzig (Germany)
70mm (160x) AB: 2020-03-16: 102/1122mm ED refractor stopped down to 70mm. Companion only visible as a subtle, elongated, not permanently visible brightening. The diffraction ring of the primary component is only visible occasionally. Difficult. Telescope should be in good optical condition!
Robert Zebahl
Leipzig (Germany)
80mm (160x) AB: 2020-03-16: 102/1122mm ED refractor stopped down to 80mm. Companion permanently visible as elongated brightening in the diffraction ring. But the diffraction ring itself appears rather faint. Moderately difficult.
Robert Zebahl
Leipzig (Germany)
90mm (160x) AB: 2020-03-16: 102/1122mm ED refractor stopped down to 90mm. Companion quite clearly recognizable as elongated brightening in diffraction ring. Relatively simple.
Robert Zebahl
Leipzig (Germany)
102mm (160x) AB: 2020-03-16: The faint companion is immediately recognizable as a distinct, slightly elongated brightening in the diffraction ring. Easy.
Robert Zebahl
Leipzig (Germany)
152mm (150x) AB: 2020-03-19: At 150x the clearly fainter companion is visible as a roundish brightening. Due to the chromatic aberration of the achromat (152mm f/5.9) the companion is almost outshined. At 180x the companion is then well, at 225x and 300x very well visible as a tiny separated star.
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: Very tight pair, a little more than hairline split, ~2 delta mag.
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: Very tight pair, a little more than hairline split, ~2 delta mag. 8" 333x: white and dull blue, ~1", Nice!
Frederik Wanink
Itterbeck (Germany)
254mm (640x) AB: schwierig wegen Helligkeitsunterschied ../projects/double-stars/frederik-wanink/sketches/25CVn.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) AB: Very pretty pale yellow and orange, 2-3 delta mag, ~2"
★★ STF1777, 84 Vir 5m5 8m3 2.7'' 227° 2015 Vir 13h43m03.71s +03°32'16.40"
Uwe Pilz
Leipzig (Germany)
105mm (200x) deutliche Aufhellung im 1. Ring, nicht sonderlich schwierig ../projects/double-stars/uwe-pilz/sketches/200516_84Vir.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Light orange and blue-green B, large magnitude difference, ~3". Pretty.
Gerd Kohler
Langenzenn (Germany)
254mm (218x) Blasses rot - eventuell rötlich. Enges Paar. Deutlicher Helligkeitsunterschied.
★★ STF1821, kappa Boo, 17 Boo, Asellus Tertius AB 4m5 6m6 13.8'' 235° 2019 Boo 14h13m29.00s +51°47'23.80"

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

Christopher Hay
Seeheim (Germany)
15x60 On tripod. Fine split. Attractive together with well-split Iota Boo in 3.3° FOV.
Iota, Kappa, Theta were called Aselli by Johannes Bayer in the 17th century, meaning The Donkeys. The group is found easily naked-eye under a 5mag sky. Kappa Boo is Asellus Tertius, The Third Donkey.
A physical double at a distance to us of 163 light years.
René Merting
Drachhausen (Germany)
18x70 Komponente A strahlt so hell, dass B deutlich schwächer ganz knapp im SW von A abgesetzt sichtbar ist - Helligkeitsunterschied schätzungsweise 3 Magnituden (nur 2.09 mag laut Stelle Doppie)
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-24: Clearly separated with significant difference in brightness. The primary component showed a pale yellowish-orange color with a greyish companion. To the southeast there is the double star STFA 26.
Sarah Gebauer
Germany
100mm (73x) sehr schön zusammen mit STFA 26 in einem Gesichtsfeld bei 73x, dabei sehr schön getrennt ../projects/double-stars/sarah-gebauer/sketches/STF1821%20und%20STFA26.jpg
Uwe Pilz
Leipzig (Germany)
105mm (144x) weiß-grau, trennbar bei 22x
Karsten Kopp
Köln (Germany)
600mm (180x) Im CLT leicht zu trennen. Beider Sterne erscheinen weißlich.
STF1816 7m4 7m8 0.4'' 100° 2019 Boo 14h13m54.63s +29°06'19.50"

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

Uwe Pilz
Leipzig (Germany)
105mm (88x) gelb ../projects/double-stars/uwe-pilz/sketches/stf1816.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Rod-shaped equal white. July 2017
STF1829 8m1 8m6 5.6'' 151° 2019 Boo 14h15m27.95s +50°26'24.60"
Robert Zebahl
Leipzig (Germany)
16x70 2021-03-21: Clearly elongated, felt almost separated.
Sarah Gebauer
Germany
100mm (73x) nadelfein getrennt, bildet die Ecke des Buchstabens L, das (mit Amiciprisma) auf dem Kopf steht ../projects/double-stars/sarah-gebauer/sketches/STF%201829.jpg
Uwe Pilz
Leipzig (Germany)
105mm (144x) einfach
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal white wide.
★★ STF1830 & STF1831 STF1831 AB 7m2 9m6 5.8'' 138° 2017 UMa 14h16m08.47s +56°42'45.70"
STF1831 AC 7m2 6m7 112.2'' 219° 2017
STF1831 CD 6m7 13m1 112.1'' 116° 2016
STF1830 CE 6m7 9m3 138.0'' 245° 2016
STF1830 EF 9m3 10m3 10.6'' 312° 2017
STF1830 EG 9m3 12m2 35.2'' 81° 2017
Christopher Hay
Seeheim (Germany)
7x45 STF1831 (AC): Wide split at 7x but still a very distinct impression of being a double. No colour impression. Two fine pinpricks of light, rather attractive in 8° FOV.
According to Stelledoppie the A-C pair, at 509 light years distance to us, is the only physical pair in the whole STF 1830/1831 complex. A nice physical double for small binoculars.
Robert Zebahl
Leipzig (Germany)
8x40 STF1831 (AC): 2020-04-05: Fairly wide pair with slight differences in brightness and color. C appeared slightly orange, A on the other hand slightly bluish. Comparatively bright double star, which gives a nice view.
Robert Zebahl
Leipzig (Germany)
55mm (27x) STF1831 (AC): 2020-04-05: Moderate difference in brightness. C: pale orange, A: subtle blue.
Robert Zebahl
Leipzig (Germany)
70mm (57x) 2020-04-11: At 22x the components AB, C, E & F are well visible and widely separated. E & F are comparatively faint. The C component in the middle appeared white-yellowish, AB rather white with a slight tendency to blue. At 57x, the pair AB with a clear difference in brightness can be easily split. An altogether rewarding and unusual multiple system. ../projects/double-stars/robert-zebahl/sketches/2020-04-11_stf1830_stf1831.jpg
Uwe Pilz
Leipzig (Germany)
105mm (88x) Komponente G erforderte 200x ../projects/double-stars/uwe-pilz/sketches/200411stf1830.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) STF1831 (AB): One pair close to another, 5" and 2 delta mag. Part of a widely separated equal pair, and a gang of three stars further away -- five additional pairings in the system.
René Merting
Drachhausen (Germany)
320mm (72x) EF: bei 72x ein schwaches Sternpaar, gut getrennt - E ist gelblich, F eine halbe Größenklasse schwächer und grau
EG: bei 72 ist nordöstlich von EF noch ein ganz schwacher Lichtpunkt erkennbar - G hat ungefähr mit dreifachem Abstand EF
René Merting
Drachhausen (Germany)
320mm (72x) AB: bei 144x ist B ein bisschen mehr als knapp getrennt im SO von A erkennbar - B ist deutlich schwächer und grau gegen den weißgelblich strahlenden A - zurück auf 72x kann ich die beiden auch noch extrem knapp getrennt erkennen in guten Momenten - ein schönes Doppel zusammen mit STF1830 EF
AC: bei 72x fällt die helle Komponente C im Südwesten von AB zwar auf, ich hätte aber nicht vermutet, dass der Stern dazu gehört
★★ STFA26, iota Boo, 21 Boo AB 4m8 7m4 39.0'' 33° 2017 Boo 14h16m10.07s +51°22'01.30"
Robert Zebahl
Leipzig (Germany)
8x40 2020-04-05: Even with tripod the faint companion was not visible.
Christopher Hay
Seeheim (Germany)
15x60 On tripod. Well split, companion seems bluish.
Fine 3.3° FOV star field with Kappa Boo (also split) and Theta Boo plus several 6th to 7th mag stars. Iota, Kappa, Theta were called Aselli by Johannes Bayer in the 17th century, meaning The Donkeys. The group is found easily naked-eye under a 5mag sky. Iota Boo is Asellus Secundus, The Second Donkey.
A physical double at a distance to us of 95 light years.
Robert Zebahl
Leipzig (Germany)
16x70 2021-03-21: Very beautifully embedded in a group of bright and medium bright stars. Significant difference in brightness. Primary component appeared white-yellowish, the much fainter companion grey-bluish at best.
René Merting
Drachhausen (Germany)
18x70 ein schönes ungleiches Paar, aber Komponente B ist deutlich besser abgesetzt von A erkennbar als beim Nachbar-DS STF1821 - leichter Farbkontrast
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-24: Similar view to the northwest standing kappa Boo. Nicely separated with larger distance and fainter companion. The primary component appeared rather white.
Sarah Gebauer
Germany
100mm (73x) bei 73x weit getrennt mit sichtbarem Helligkeitsunterschied, passt zusammen mit STF1821 in ein Gesichtsfeld und ist sehr schön anzusehen ../projects/double-stars/sarah-gebauer/sketches/STF1821%20und%20STFA26.jpg
Uwe Pilz
Leipzig (Germany)
105mm (144x) sehr weit, auffallend bei 22x
STT281 7m7 9m7 1.5'' 166° 2017 Boo 14h20m20.85s +08°34'56.30"
Uwe Pilz
Leipzig (Germany)
105mm (200x) der Begleiter ist schwach und schwierig ../projects/double-stars/uwe-pilz/sketches/191129stf281.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Very fine, but well split, huge delta mag, surprise!
STF1850 7m1 7m6 25.2'' 263° 2018 Boo 14h28m33.29s +28°17'25.90"
Robert Zebahl
Leipzig (Germany)
8x40 2020-04-05: Separated, but still quite close together with a moderate difference in brightness.
Christopher Hay
Seeheim (Germany)
15x45 Handheld, binoculars with internal stabilisation. A tight pair, indirect vision helps to see black in-between. Eastern component clearly brighter. Nice in 4.5° FOV with Rho and Sigma Boo.
A physical double at a distance to us of 1140 light years.
René Merting
Drachhausen (Germany)
16x70 ein gut getrenntes Paar zweier gleich heller Sterne - beide weiß
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-04-24: Easily separated, medium bright with rather small difference in brightness and moderate distance. Fairly conspicuous. The components appeared white-yellowish and white-bluish. Beautiful double star.
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x locker getrennt - Komponente B ist vielleicht eine halbe Magnitude schwächer als A und strahlt ein wenig dumpfer bzw. weniger weiß
Uwe Pilz
Leipzig (Germany)
120mm (72x) recht weit, schöner Farbkontrast ../projects/double-stars/uwe-pilz/sketches/210522stf1850.jpg
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/STF%201850.jpg
STF1863 7m7 7m8 0.6'' 63° 2018 Boo 14h38m00.71s +51°34'42.10"

../images/binary-star-orbits/STF1863-orbit.jpg

Robert Zebahl
Leipzig (Germany)
102mm (280x) 2021-05-16: The double star appeared elongated with an estimated position angle of 60°.
Christopher Hay
Seeheim (Germany)
180mm (200x) 30 May 2021, current separation 0.65” according to Stelledoppie. No prior PA knowledge nor knowledge of relative brightnesses.
Constant elongation seen. Definite determination of position of the primary within the elongation, more definite than the relative brightnesses (consulted after observation) would have led me to expect. PA estimated at 60°.
In good moments fragments of a pear-shaped first diffraction ring surround the system, particularly on the side of the primary. An interesting and attractive sight.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) gerade trennbar ../projects/double-stars/frederik-wanink/sketches/STF1863.jpg
★★ zeta Boo STF1865 AB 4m5 4m5 0.3'' 282° 2019 Boo 14h41m08.92s +13°43'42.00"
H6 104 AB-C 4m5 11m0 104.3'' 260° 2015

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

Uwe Pilz
Leipzig (Germany)
105mm (88x) AB-C ../projects/double-stars/uwe-pilz/sketches/zetaBoo.jpg
Mark McCarthy
Fremont (California/USA)
508mm (1067x) AB: Zeta Boo. Short period. First impression was moderately well notched overlapping disks (eg. not barely notched, but not strongly notched either). With more time observing & getting used to the image, and in moments of better seeing, the notch became more distinct. It would not separate in spite of moments of better seeing. I could also see the elongation, but only subtly notched due to the smaller scale, at 667x
STF1878, DL Dra 6m3 9m2 4.2'' 314° 2015 Dra 14h42m03.25s +61°15'42.90"

../images/binary-star-orbits/STF1878-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (198x) starke Aufhellung im ersten Ring ../projects/double-stars/uwe-pilz/sketches/stf1878.jpg
★★ 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.
Christopher Hay
Seeheim (Germany)
76mm (100x) AB: Secondary sits on the first diffraction ring of the primary, and appears there as a fine blue point. Further magnification not useful, merely darkens the image.
René Merting
Drachhausen (Germany)
100mm (142x) bei 107x erscheint die B-Komponente nordwestlich leicht angesetzt an der gelblich strahlenden Komponente A - bei 142x dann ist die Trennung komplett, B liegt schön auf einem abgesetzten Beugungskranz von Komponente A
Stefan Loibl
Rosenheim (Germany)
102mm (205x) nice contrast yellow-orange/blue
Robert Zebahl
Leipzig (Germany)
102mm (224x) 2021-05-12: Primary component appears in bright orange, the well separated, much fainter companion at 187x grey-bluish, at 224x and higher in a very nice, pale blue.
Uwe Pilz
Leipzig (Germany)
120mm (150x) Orange und blau, sehr lohnend ../projects/double-stars/uwe-pilz/sketches/210522EpsBoo.jpg
Robert Zebahl
Leipzig (Germany)
120mm (192x) At 85x the fainter component was easily visible but not separated. At 192x well split. The fainter component was almost on the first diffraction ring of the primary component. Quite big difference in brightness. I did not looked at the color of the components.
Sarah Gebauer
Germany
150mm (166x) weder mit 166x noch mit 250x im April 2020 getrennt
Gerd Kohler
Langenzenn (Germany)
254mm (346x) Gelblich - leicht bläulich. Enges Paar. Deutlicher Helligkeitsunterschied.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) deutl. Farbkontrast blau gelb ../projects/double-stars/frederik-wanink/sketches/Izar.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Izar: Yellow-orange and blue, very pretty, as always
Karsten Kopp
Köln (Germany)
600mm (257x) Sehr einfaches und auffälliges Objekt. Dieser Doppelstern war für mich an diesem Abend das Highlight. Vor allem, weil der schwächere hellblaue Stern gerade knapp neben den Spikes des helleren gelben Sterns steht. ../projects/double-stars/karsten-kopp/sketches/STF1877.jpg
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/Izar.jpg
Berthold Fuchs
Wiesbaden (Germany)
130mm magnificent DS ../projects/double-stars/berthold-fuchs/photographs/eps%20Bootis.png
STF1881 6m7 8m8 3.5'' 2017 Vir 14h47m05.35s +00°58'15.20"
Uwe Pilz
Leipzig (Germany)
70mm (198x) sehr schwierig, einfach mit 105mm ../projects/double-stars/uwe-pilz/sketches/stf1881.jpg
Mark McCarthy
Fremont (California/USA)
203mm (205x) Blue-white and 3-4 delta mag fainter B star, dull blue color. Well separated.
STF1884 6m6 7m5 2.1'' 58° 2019 Boo 14h48m23.37s +24°22'01.00"

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

René Merting
Drachhausen (Germany)
100mm (64x) bei 64x ist der Doppelstern als 8 erkennbar, 107x reicht dann für die knappe Trennung - die B-Komponente im NO ist nur unwesentlich schwächer - ein sehenswertes Pärchen
Robert Zebahl
Leipzig (Germany)
102mm (86x) At 86x pretty tight and unequal. At 160x clearly split. A: white, B: slightly orange.
Mark McCarthy
Fremont (California/USA)
203mm (333x) Prototypical pair, >1 delta mag, ~3" separation, white to off white color
Frederik Wanink
Itterbeck (Germany)
254mm (640x) einfach ../projects/double-stars/frederik-wanink/sketches/STF1884.jpg
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern konnte gerade so getrennt werden. Beide Sternen leuchten weißlich.
BU106, mu Lib, 7 Lib AB 5m6 6m6 1.9'' 2019 Lib 14h49m19.09s -14°08'56.30"
AC 5m6 14m7 12.9'' 294° 2000
AD 5m6 14m1 25.7'' 168° 2000
AE 5m6 12m6 26.6'' 232° 2015

../images/binary-star-orbits/BU106-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) AB: Close, 1.5-2", half to one delta mag, off-white stars.
Gerd Kohler
Langenzenn (Germany)
254mm (346x) AB: Bläulich-weiß - bläulich-weiß. A und B haben nur einen geringen Helligkeitsunterschied.
Gerd Kohler
Langenzenn (Germany)
254mm (346x) AE: Bläulich-weiß - weiß. Stern E ist sehr schwach.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) AB: getrennt, schwierig wegen Südlage ../projects/double-stars/frederik-wanink/sketches/MuLib.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) AB: Mu Lib: Easy, white & off white, 1 delta mag, ~3"
STF1890, 39 Boo 6m3 6m7 2.5'' 46° 2019 Boo 14h49m41.37s +48°43'15.60"

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

Robert Zebahl
Leipzig (Germany)
70mm (67x) 2020-04-01: At 44x elongated, partly notched. At 67x split, but very tight. A difference in brightness was not seen. At 133x clearly separated with little difference in brightness. A appeared pale yellow, B rather warm-white.
Robert Zebahl
Leipzig (Germany)
70mm (100x) 2020-04-18: At 57x very finely separated with extremely tightly spaced components that appeared equally bright. At 100x a very nice pair with little difference in brightness. Fantastic sight! The color of the components was slightly different: creamy-white & a touch of yellow-orange.
Robert Zebahl
Leipzig (Germany)
102mm (187x) 2021-05-16: Easy. Beautiful double star with slight difference in brightness. Yellowish & rather white. I estimated the position angle to 40°.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) gleich hell ../projects/double-stars/frederik-wanink/sketches/39Boo.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Bright white pair, well split
STF1885 8m8 9m1 4.1'' 146° 2017 Vir 14h50m33.12s -00°01'26.80"
Uwe Pilz
Leipzig (Germany)
120mm (128x) gelb und lila ../projects/double-stars/uwe-pilz/sketches/210522stf1884.jpg
xi Boo, 37 Boo STF1888 AB 4m8 7m0 5.2'' 298° 2019 Boo 14h51m23.38s +19°06'01.70"
STF1888 AC 4m8 13m8 71.3'' 340° 2015
STF1888 AD 4m8 11m7 160.8'' 286° 2015
ARN11 AE 4m8 8m7 271.5'' 98° 2015
ARN11 AF 4m8 9m2 337.5'' 37° 2015
STF1888 BC 7m0 13m8 63.9'' 340° 2001
STF1888 BE 7m0 8m7 273.5'' 102° 2009

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

Robert Zebahl
Leipzig (Germany)
70mm (44x) AB: 2020-04-24: Beautifully separated with quite a large difference in brightness in a lovely star field. The primary component shines yellowish with a faint companion.
Sarah Gebauer
Germany
150mm (83x) AB: die 6'' entfernten Komponenten A und B konnten mühelos bei 83x getrennt werden, Komponente E war zu sehen, C, D und F waren nicht sichtbar ../projects/double-stars/sarah-gebauer/sketches/20200416%20Xi%20Boo%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
508mm (333x) AB: Xi Boo. Short period. Richly colored yellow and orange stars, ~1 delta mag, ~5" separation, with several other stars in view. Very pretty
Karsten Kopp
Köln (Germany)
600mm (180x) AB: Ein recht schöner Doppelstern, wobei neben dem Helligkeitsunterschied von 2,2 mag auch die Sternfarben ein schönes Gesamtbild geben. Der hellere Stern erstrahlt gelblich weiß und der schwächere orangegelb.
Hier handelt es sich auch um ein recht nahes System mit 21,9 Lichtjahren Entfernung.
../projects/double-stars/karsten-kopp/sketches/STF1888.jpg
Frederik Wanink
Itterbeck (Germany)
254mm AB ../projects/double-stars/frederik-wanink/photographs/Xi%20Bootis.jpg
STT288 6m9 7m5 1.1'' 160° 2019 Boo 14h53m23.35s +15°42'18.30"

../images/binary-star-orbits/STT288-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) Consistent split, better with seeing, ~1 delta mag, ~1" separation, blue-white stars
Frederik Wanink
Itterbeck (Germany)
254mm (640x) rel. einfach ../projects/double-stars/frederik-wanink/sketches/STT288.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Notched / figure 8 with 277x, split with 553x.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Needed 553x to separate, resolved with the seeing. Near equal yellow-white, ~1" or less.
STF1909, 44 Boo 5m2 6m1 0.3'' 95° 2019 Boo 15h03m47.30s +47°39'14.60"

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

Frederik Wanink
Itterbeck (Germany)
254mm (640x) 2015 getrennt zu sehen (1") ../projects/double-stars/frederik-wanink/sketches/44Boo.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) I Boo. Figure 8 to hair split, ~0.9". This pair shrinking separation fast, will be <0.5" in a couple of years. Only 40 LY away. (July 2017)
STF1932 AB 7m3 7m4 1.6'' 267° 2019 CrB 15h18m20.19s +26°50'24.70"

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

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!
BU32, 6 Ser AB 5m5 8m8 3.4'' 23° 2019 Ser 15h21m02.00s +00°42'55.20"
Robert Zebahl
Leipzig (Germany)
102mm (224x) Not split. Tried at 224x and 280x. Companion probably too faint. I had sidewalk lighting in the immediate vicinity.
Uwe Pilz
Leipzig (Germany)
105mm (288x) Der Begleiter ist sehr schwach. Auch mit 90 mm Blende noch gesehen ../projects/double-stars/uwe-pilz/sketches/190628_6Ser.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) Light yellow A and very much fainter B, wide separation.
STF1937, eta CrB AB 5m6 6m0 0.4'' 264° 2019 CrB 15h23m12.23s +30°17'17.70"
Mark McCarthy
Fremont (California/USA)
203mm (667x) 8" 333x Suspect elongation. 8" 667x definite egg shape. 20" 667x Can't get a good focus.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) deutlich als 8 zu sehen, 2015 0,6" ../projects/double-stars/frederik-wanink/sketches/EtaCrB.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Close orange pair, equal mag, snowman shape
Mark McCarthy
Fremont (California/USA)
317mm (553x) Overlapping / notched orange-yellow stars. Used apodising mask.
★★★ mu Boo, 51 Boo, Alkalurops CHR181, mu 1 Boo Aa-Ab 4m3 0.1'' 188° 2012 Boo 15h24m29.54s +37°22'37.10"
STFA28, mu 1 Boo AB 4m3 7m1 109.0'' 172° 2018
STF1938, mu 2 Boo Ba-Bb 7m1 7m6 2.3'' 2019

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

Christopher Hay
Seeheim (Germany)
7x45 STFA28 (AB): Handheld. Wide split. A compact uneven pair. Component A is bluish-white.
Rather charming in 8.6° FOV with Nu1/2 Boo, which has a gorgeous colour contrast, golden-orange and ice-blue, making it one of the strongest colour-contrast pairs in the sky for binoculars and greatly accentuating the sight of Mu Boo.
In 15x45 binoculars STFA28 AB is very wide, component A bluish-white, B warmer.
Robert Zebahl
Leipzig (Germany)
8x40 STFA28 (AB): Easily split with obvious difference in brightness.
Robert Zebahl
Leipzig (Germany)
16x70 STFA28 (AB): 2021-06-14: Wide, relatively striking pair. Pale yellow & dark orange.
René Merting
Drachhausen (Germany)
16x70 STFA28 (AB): weit getrenntes Pärchen, aufgrund der großen Helligkeitsunterschiedes schöner Farbkontrast - Komponente A im Norden gelblich, B im Süden mehr grau-braun
Robert Zebahl
Leipzig (Germany)
70mm (22x) STFA28 (AB): Evident, very wide apart and unequal. A: white-yellowish, B: grey.
Robert Zebahl
Leipzig (Germany)
102mm (125x) 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
Christopher Hay
Seeheim (Germany)
180mm (105x) STF1938 (Ba-Bb): At 105x in poor seeing a kissing, evenly matched pair. At 180x clearly split despite the poor seeing, southern component (Ba) seems slightly brighter than Bb.
Mark McCarthy
Fremont (California/USA)
203mm (205x) STFA28 (AB): Bright A star does not seem round. The B star is a tight equal pair, pretty set. [Aa,Ab is CHR 181 0.1", and I'd be shocked if I actually detected it. STFA 28 is technically the bright star and the tight pair, the tight pair is Ba,Bb = STF 1938, 7.09/7.63, 2.2"]
Mark McCarthy
Fremont (California/USA)
203mm (205x) STFA28 (AB): Bright A star does not seem round (CHR181). B star is a tight equal pair (STF1938 Ba-Bb). Pretty set. STFA 28 is technically the bright star and the tight pair
Mark McCarthy
Fremont (California/USA)
203mm (205x) CHR181 (Aa-Ab): Bright A star does not seem round (CHR181). B star is a tight equal pair (STF1938 Ba-Bb). Pretty set. STFA 28 is technically the bright star and the tight pair
Mark McCarthy
Fremont (California/USA)
203mm (205x) STF1938 (Ba-Bb): Bright A star does not seem round (CHR181). B star is a tight equal pair (STF1938 Ba-Bb). Pretty set. STFA 28 is technically the bright star and the tight pair
Frederik Wanink
Itterbeck (Germany)
254mm (640x) STF1938 (Ba-Bb): 3er System, schön ../projects/double-stars/frederik-wanink/sketches/STF1938.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) STFA28 (AB): Bright white star with tight yellow pair STF 1938 as its companion.
Mark McCarthy
Fremont (California/USA)
317mm (553x) STFA28 (AB): Striking. Bright star with near equal double STF 1938 paired with it. A star is a spectroscopic binary
Mark McCarthy
Fremont (California/USA)
317mm (553x) STF1938 (Ba-Bb): Near equal close but well split double also paired with STFA28
Karsten Kopp
Köln (Germany)
600mm (257x) Hier handelt es sich um ein Dreifachsternsystem, welches jetzt aber nicht durch eine besondere Färbung der Sterne auffällt. Die A - B/C Komponenten stehen noch sehr weit auseinander, wobei auch die A-Komponente um einiges heller erscheint. Die beiden Komponenten B/C sind wesentlich näher beieinander und unterscheiden sich auch kaum in ihrer Helligkeit. ../projects/double-stars/karsten-kopp/sketches/mu%20Boo.jpg
HU149 7m5 7m6 0.7'' 272° 2017 Dra 15h24m35.30s +54°12'46.10"

../images/binary-star-orbits/HU149-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) mit Zwischenraum zu sehen ../projects/double-stars/frederik-wanink/sketches/HU149.jpg
COU610, 4 CrB, theta CrB 4m3 6m3 0.8'' 198° 2016 CrB 15h32m55.78s +31°21'32.90"
Uwe Pilz
Leipzig (Germany)
120mm (250x) blau; gerade eben länglich, PW richtig. Richtung des schwächeren Sterns war erkennbar. ../projects/double-stars/uwe-pilz/sketches/210725thetaCrB.jpg
Robert Zebahl
Leipzig (Germany)
152mm (300x) 2021-07-23: Theta CrB was only a few degrees above the house roof and the refractor was insufficiently cooled down. In no way visible as a double star. I used magnifications from 200x to 400x.
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.
STF1954, delta Ser, 13 Ser AB 4m2 5m2 4.0'' 171° 2019 Ser 15h34m48.14s +10°32'20.00"
AC 4m2 13m9 66.6'' 18° 2014
CD 13m9 14m6 4.0'' 341° 2018

../images/binary-star-orbits/STF1954-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (57x) AB: Easy to separate with relatively close components and a clear difference in brightness. A appeared rather white, B slightly orange.
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 142x zwei gut getrennte reinweiße Komponenten - B wirkt eine halbe Größenklasse schwächer - zurück auf 107x ist die Trennung ebenfalls einfach - zurück auf 64x ist es eine 8 mit tiefen Einschnürungen, kurz vor der Trennung
Stefan Loibl
Rosenheim (Germany)
102mm (102x) AB: sparse field
Sarah Gebauer
Germany
150mm (85x) AB: Mit 85x schon schön getrennt, ein leichter Größenunterschied der Sterne zu erkennen, einige schwache Feldsterne im Okular bei 0,95° Gf. ../projects/double-stars/sarah-gebauer/sketches/20200422%20Delta%20Ser%20DSk.jpg
Frederik Wanink
Itterbeck (Germany)
254mm (640x) AB: getrennt, Del Ser ../projects/double-stars/frederik-wanink/sketches/STF1954.jpg
STF1965, zeta CrB, zeta 1/2 CrB 5m0 5m9 6.3'' 306° 2019 CrB 15h39m22.68s +36°38'09.00"
Robert Zebahl
Leipzig (Germany)
16x70 2021-06-14: A slight elongation can be guessed at best.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein knapp getrenntes deutlich helleres Pärchen als der 27' südwestlich stehende Doppelstern STF1964 - Komponente B ist gut eine Größenklasse schwächer als A - beide Komponenten schmiegen sich meist noch aneinander, aber in guten Momenten sind beide getrennt sichtbar - zurück auf 20x ist ein länglicher Stern erkennbar
Robert Zebahl
Leipzig (Germany)
102mm (28x) At 28x very tight and barely split, unequal. At 86x very nice view. No difference in color: both components appeared white.
Stefan Loibl
Rosenheim (Germany)
102mm (68x) Elongated at 28x, split with 68x. Component A blue, B reddish. At 68x double star STF1964 in the same FOV ../projects/double-stars/stefan-loibl/sketches/ZetaCrB_20200601.jpg
Robert Zebahl
Leipzig (Germany)
120mm (48x) Very nice double star, well split with noticeable difference in brightness.
Mark McCarthy
Fremont (California/USA)
317mm (277x) Bright white, well separated, ~1 delta mag.
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern konnte gut getrennt werden. Der Helligkeitsunterschied ist nicht sehr groß und der etwas hellere Stern erscheint weißlich und der schwächere geht eher ins bläulich weiße.
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/Zeta%20CrB.jpg
STF1989, pi UMi 7m3 8m2 0.7'' 23° 2013 UMi 15h39m38.61s +79°58'59.60"

../images/binary-star-orbits/STF1989-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) blickweise als 8 zu sehen, schwierig ../projects/double-stars/frederik-wanink/sketches/pi2Umi.jpg
★★ STF1973 7m6 8m8 30.8'' 320° 2015 CrB 15h46m24.50s +36°26'45.60"
René Merting
Drachhausen (Germany)
18x70 ein gut getrenntes Sternpaar - Komponente A im Südosten ist doppelt so hell wie B - ganz leichter Farbkontrast
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x sind beide Sterne gut getrennt erkennbar - schöner Farbkontrast zwischen beiden ungleich hellen Sternen
Uwe Pilz
Leipzig (Germany)
105mm (53x) blaugrün-orange, trennbar bei 15x ../projects/double-stars/uwe-pilz/sketches/stf1973.jpg
Robert Zebahl
Leipzig (Germany)
120mm (23x) Nice double star, easy to split with noticeable difference in brightness.
Mark McCarthy
Fremont (California/USA)
317mm (553x) Wide, 1 delta magnitude white.
H3 7, beta Sco AC 2m6 4m5 13.4'' 20° 2019 Sco 16h05m26.23s -19°48'19.40"
Christopher Hay
Seeheim (Germany)
15x45 Stabilised binoculars, handheld. Difficult handheld in this instrument, but clearly split and attractive as such. Tripod mounting would surely help and make the difference for a nice pair for this magnification. One of the earliest doubles split, found by Benedetto Castelli in 1627, but according to Stelledoppie not a physical double (in contrast to the very tight BU 947 AB pair in the system, which is physical, with a separation of 0.3” in 2020 and 0.4” in 2030 – and the wide PWL 9001 AD pair with a separation of 518” – A, B and D are thus a physical triple). “H“ in the catalogue name means that this double star is listed in the catalogue of W. Herschel. The 3 in the name means that it is a double star of the 3rd Class [separation 5'' - 15''] in Herschel’s system.
Sarah Gebauer
Germany
150mm (85x) unspektakulär, mit 85x einfach zu trennen, wenige Feldsterne ../projects/double-stars/sarah-gebauer/sketches/20200717%20Beta%20Sco%20DSk.jpg
★★ 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
lambda Oph, 10 Oph, STF2055, Marfic AB 4m2 5m2 1.4'' 44° 2019 Oph 16h30m54.84s +01°59'02.80"

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

Stefan Loibl
Rosenheim (Germany)
102mm (205x) components cannot be split at 205x
Uwe Pilz
Leipzig (Germany)
105mm (288x) schöner Farbkontrast, lohnend. ../projects/double-stars/uwe-pilz/sketches/190721LambdaOph.jpg
Sarah Gebauer
Germany
150mm (160x) habe den Doppelstern zwar gefunden und konnte auch erkennen, dass es zwei Sterne sind, eine Trennung war aber heute Abend nicht möglich
Mark McCarthy
Fremont (California/USA)
203mm (205x) Marfic. Nice blazing white pair, ~1 delta, ~2". 129 year period, but not much change in the next few years
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/Marfic.jpg
STT313 8m0 8m3 0.9'' 128° 2018 Her 16h32m33.19s +40°06'47.70"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) mit Zwischenraum zu sehen ../projects/double-stars/frederik-wanink/sketches/STT313.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Clean split, near equal pair. Nice
★★★ 16/17 Dra STFA30, 16/17 Dra AC 5m4 5m5 90.2'' 193° 2018 Dra 16h36m13.72s +52°55'27.80"
STF2078, 17 Dra AB 5m4 6m4 3.3'' 104° 2018
Christopher Hay
Seeheim (Germany)
3x63 Clean split. Separation is much clearer than that of Nu1/2 Dra (STFA35), which is also in 14° FOV and is hair-fine split.
A physical double at a distance to us of 412 light years.
Christopher Hay
Seeheim (Germany)
7x45 A well split and nicely compact pair. When 16/17 Dra is put at the edge of the 8.6° field of view, Nu1/2 Dra stands at the opposite edge. Their comparison thus suggests itself. 16/17 is somewhat wider than Nu1/2. While the components of Nu1/2 are of equal brightness and whiteness, those of 16/17 display a slight difference in both brightness and colour. 17 (A) first seems bluer than 16 (C), but after 20 seconds this impression flips to C and from then on goes back and forth.
Robert Zebahl
Leipzig (Germany)
55mm (27x) STFA30 (AC): Rather wide pair with almost equal components. C component appeared slightly yellowish-orange.
Robert Zebahl
Leipzig (Germany)
55mm (71x) Grand sight! ../projects/double-stars/robert-zebahl/sketches/2019-05-18_16_17_dra.jpg
Christopher Hay
Seeheim (Germany)
80mm (30x) 16 Dra seems more bluish than 17 Dra, the latter seems slightly yellow in comparison and is distinctly elongated. At 84x 17 Dra is cleanly split and such a delightful view together with 16 Dra that I had no desire to ramp up the magnification. All three stars belong to a physical system.
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 64x noch ein Stäbchen, bei 107x ist B dann knapp getrennt östlich von A erkennbar - B ist auch noch relativ hell bzw. maximal eine Magnitude schwächer
AC: bei 32x weit auseinander stehend - Komponente C im Süden ist maximal eine viertel Magnitude schwächer - leichter Farbkontrast, A weißgelb und C kühlweiß
Frederik Wanink
Itterbeck (Germany)
254mm (640x) STF2078 (AB): sehr schönes Dreiersystem ../projects/double-stars/frederik-wanink/sketches/17Dra.jpg
STF2084, zeta Her, 40 Her 3m0 5m4 1.6'' 110° 2019 Her 16h41m17.16s +31°36'09.80"

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

Sarah Gebauer
Germany
100mm (136x) auf Anhieb ganz haarscharf getrennt, aber leider nur wenige Sekunden haltbar; dennoch erfolgreiche Trennung!
Robert Zebahl
Leipzig (Germany)
102mm (224x) Faint companion as distinct brightening on the first diffraction ring visible. In steadier moments visible as small, round condensation. ../projects/double-stars/robert-zebahl/sketches/2019-06-30_zeta_her.jpg
Robert Zebahl
Leipzig (Germany)
102mm (280x) After a longer, concentrated observation, a permanent brightening of the first diffraction ring of the primary component could be seen at the correct position angle. The brightening appeared only arch-shaped without any noticeable condensation. ../projects/double-stars/robert-zebahl/sketches/2019-06-25_zeta_her.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) äußerst schwierig
Uwe Pilz
Leipzig (Germany)
105mm (288x) Bei sehr ruhiger Luft ohne Probleme sichtbar, trotz der störenden Restkoma meines Refraktors ../projects/double-stars/uwe-pilz/sketches/190721ZetHer.jpg
Mark McCarthy
Fremont (California/USA)
203mm (533x) Zeta Her. B was seen, not too difficult as a disk within the diffraction of bright A, just outside first ring so ~1.5", like a diamond ring, significant mag difference
Frederik Wanink
Itterbeck (Germany)
254mm (640x) nicht als DS gesehen
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF2084.jpg
René Merting
Drachhausen (Germany)
320mm (320x) in der Nacht konnte ich nur bis 320x gewinnbringend vergrößern - Komponente A zeigt schöne Beugungsscheibchen, B offenbarte sich mir nicht
STF2098 AB 8m8 9m6 14.3'' 145° 2015 Her 16h45m43.47s +30°00'17.20"
AC 8m8 8m8 65.9'' 128° 2015
AD 8m8 11m0 67.6'' 18° 2015
DE 11m0 13m7 5.8'' 268° 2015
Robert Zebahl
Leipzig (Germany)
102mm (86x) Already at 28x the components A, B and C were noticeable at first view. At 86x, component D could also be observed very well. The components are all comparatively far apart. ../projects/double-stars/robert-zebahl/sketches/2019-06-23_stf2098.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: 4 stars in an arc. Assume AB is the closer pair ~1 delta mag. All wide. (5 stars in 5 pairings)
Mark McCarthy
Fremont (California/USA)
508mm (333x) AB: AB, AC, AD, four star system all within a mag of each other, forming a gentle arc. (Actually 5 stars, I missed DE which is 13th mag. Says it's physical -- all 5 are?)
John Raymond
Richmond (Virginia/USA)
Taken in 2017 with 18” Dobsonian. Single images with Canon M3 camera, <30s ../projects/double-stars/john-raymond/photographs/stf2098.jpg
STF2096, 19 Oph AB 6m1 9m7 23.9'' 88° 2019 Oph 16h47m09.76s +02°03'52.40"
AC 6m1 11m4 214.1'' 193° 2015
Uwe Pilz
Leipzig (Germany)
16x70 AB: äußerst schwierig; sehenswertes Sternfeld ../projects/double-stars/uwe-pilz/sketches/200725_19Oph.jpg
René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 20x ein knapp getrenntes Pärchen, Komponente B ist sehr schwach - bei 32x dann deutliche Trennung und ästhetischerer Anblick - der Helligkeitsunterschied zwischen den Komponenten ist enorm, sicherlich mehr als 3 Magnituden
Uwe Pilz
Leipzig (Germany)
105mm (200x) Hauptkomponente gelb-orange ../projects/double-stars/uwe-pilz/sketches/190721_19Oph.jpg
★★ 52 Her A1866 BC 9m5 9m6 0.3'' 266° 2012 Her 16h49m14.20s +45°59'00.40"
BU627 A-BC 4m8 8m4 2.2'' 44° 2018

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

René Merting
Drachhausen (Germany)
100mm (142x) BU627 (A-BC): bis 142x probiert, hat nicht funktioniert - der Helligkeitsunterschied ist vermutlich zu groß und das Beugungsscheibchen von A so hell wie BC selbst
Robert Zebahl
Leipzig (Germany)
102mm (280x) BU627 (A-BC): At 160x the faint component is already beginning to be visible as brightening in the first diffraction ring. At 280x the brightening is quite clearly visible and appears partly clear as a small knot in the first diffraction ring.
Uwe Pilz
Leipzig (Germany)
105mm (288x) BU627 (A-BC) ../projects/double-stars/uwe-pilz/sketches/52Her.jpg
Uwe Pilz
Leipzig (Germany)
120mm (180x) BU627 (A-BC) ../projects/double-stars/uwe-pilz/sketches/52Her_120_%20180x.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) BU627 (A-BC): 52 Her. B seen quite well, though only with seeing when bright white A's diffraction settles. B is a bluish disk ~2", very steady for a moment then lost again. Looking too long direct seems to make B disappear, A overpowers one's vision, but with a little averted vision B comes back into view. 1977 year period
Mark McCarthy
Fremont (California/USA)
317mm (553x) BU627 (A-BC): 52 Her. Very bright white star with a companion disk 2", 4-5 delta mag. Wow! B appears as if it is illuminated by A's light. Did not detect BC, 0.3"
STF2118, 20 Dra AB 7m1 7m3 0.9'' 65° 2018 Dra 16h56m25.32s +65°02'20.60"

../images/binary-star-orbits/STF2118-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) sehr einfach ../projects/double-stars/frederik-wanink/sketches/20Dra.jpg
STT318 7m0 9m6 2.9'' 243° 2015 Her 16h56m39.66s +14°08'24.90"
René Merting
Drachhausen (Germany)
100mm (64x) bei 64x zeigt sich das Pärchen in guten Momenten knapp getrennt - bei 107x wird Komponente B besser sichtbar, er wirkt gräulich wie ein halbdurchsichtiger Geist - die Trennung ist nun eindeutig, aber immer noch knapp - großer schwer einschätzbarer Helligkeitsunterschied zwischen A und B, gut 2.5 Größenklassen Differenz habe ich in der Nacht geschätzt, Treffer
Jörg S. Schlimmer
Germany
127mm (136x) Abstand ca. 3"Separation 3" ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung%20STT318_filtered_96dpi.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Pretty orange pair, 3 delta mag, ~3"
STF2112 9m7 10m3 2.1'' 263° 2018 Her 16h58m14.68s +31°47'27.60"
Uwe Pilz
Leipzig (Germany)
105mm (200x) Hauptkomponente grau-weiß ../projects/double-stars/uwe-pilz/sketches/STF2112.jpg
Mark McCarthy
Fremont (California/USA)
203mm (205x) Sharp white pair, ~2", ~1 delta mag
H4 122, V451 Her 6m3 10m3 18.9'' 238° 2015 Her 17h01m33.05s +14°56'59.00"
Jörg S. Schlimmer
Germany
127mm (136x) high contrast ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung%20H%204%20122_filtered_96dpi.jpg
★★ mu Dra, 21 Dra, Alrakis, Arrakis STF2130 AB 5m7 5m7 2.5'' 2018 Dra 17h05m20.20s +54°28'14.30"
BU1088 AC 5m7 13m7 12.2'' 174° 2015

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

Christopher Hay
Seeheim (Germany)
80mm (100x) In May 2019 neatly split, no colours seen. A physical system with a period of 812 years. Periastron was in 1946, since then the distance is widening to reach 2.7“ in 2025 and 2.8“ in 2030
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 107x zeigen sich zwei knapp getrennte Perlchen, beide gleichhell und weiß schimmernd - ein schickes Paar
Robert Zebahl
Leipzig (Germany)
102mm (125x) AB: Easy to separate. Beautiful sight. Components equally bright with no discernible color difference.
Mark McCarthy
Fremont (California/USA)
203mm (205x) AB: Mu Dra. "Arrakis" (which was the name of the planet in the book Dune, but means "Dancer" in Arabic). Light yellow-orange stars, well split, equal. 812 year period
Frederik Wanink
Itterbeck (Germany)
254mm (460x) AB: gleich hell ../projects/double-stars/frederik-wanink/sketches/STF2130.jpg
STF2122 6m4 9m7 20.3'' 279° 2015 Oph 17h06m52.94s -01°39'22.00"
Uwe Pilz
Leipzig (Germany)
16x70 konzentriertes Schauen erforderlich; der helle ist gelb ../projects/double-stars/uwe-pilz/sketches/200725_STF2122.jpg
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x zeigt sich das Pärchen gut getrennt, B segelt sichtbarkeitstechnisch hart am Limit - bei 32x ist Komponente B im Westen weiter sehr schwach bzw. mindestens 2 Größenklassen schwächer - schöner Farbkontrast, weiß-gelb vs. grau-blau
Mark McCarthy
Fremont (California/USA)
203mm (333x) Pale yellow and wide separated B, 2 delta mag.
★★ STF2140, alpha Her, 64 Her, Ras Algethi AB 3m5 5m4 5.0'' 103° 2019 Her 17h14m38.86s +14°23'24.90"

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

Robert Zebahl
Leipzig (Germany)
55mm (41x) Well split with noticeable difference in brightness.
René Merting
Drachhausen (Germany)
100mm (64x) bei 32x ist noch nichts erkennbar - bei 64x wird östlich von Rasalgethi der schwache Begleiter B knapp getrennt sichtbar - A ist strahlend gelb, B mit einer Tendenz zum gelb, eher ein warmes weiß
Uwe Pilz
Leipzig (Germany)
105mm (88x) himmelblau und hellgelb, getrennt bei 53x ../projects/double-stars/uwe-pilz/sketches/191025_alphaHer.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) gelb-lachsfarben
Robert Zebahl
Leipzig (Germany)
120mm (100x) Easily split with noticeable difference in brightness. A: intensively orange colored, B: slightly orange.
Karsten Kopp
Köln (Germany)
140mm (94x) Konnte erst mit 94-facher Vergrößerung gut getrennt wahrgenommen werden.
Sarah Gebauer
Germany
150mm (85x) bei Halbmond auf der Schwäbischen Alb: sehr eng, aber sauber getrennt, eine Komponente ist viel heller und größer, mein Farbeindruck ist allerdings unerwartet eher gelb
Sarah Gebauer
Germany
150mm (160x) richtig gold, es strahlt mich richtiggehend an, auch sehr schön getrennt, ein toller Doppelstern! ../projects/double-stars/sarah-gebauer/sketches/20200805%20Alpha%20Her%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
203mm (667x) Rasalgethi. 8" inch mask due to seeing. AB orange and blue 4 delta mag. Faint AD seen very wide separation. pretty star.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) gelblich und bläulicher Stern ../projects/double-stars/frederik-wanink/sketches/AlphaHer.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Rasalgethi, Bright orange A & pale green much fainter B. Very nice!
Karsten Kopp
Köln (Germany)
600mm (135x) Leicht zu trennen. Komponente A erscheint orange, Komponente B gelblich.
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern ist gut zu trennen. Komponente A erstrahlt orange und Komponente B gelblich. ../projects/double-stars/karsten-kopp/sketches/STF2140.jpg
Jens Leich
Germany
130mm ../projects/double-stars/jens-leich/photographs/Doppelstern_Rasalgethi_Herkules_220719_2159UT_RGB.jpg
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/alpha%20Herculis.jpg
★★ STF3127, delta Her, 65 Her AB 3m1 8m3 13.7'' 293° 2019 Her 17h15m01.92s +24°50'22.50"
René Merting
Drachhausen (Germany)
100mm (64x) was für ein schönes ungleiches Paar - bei 64x präsentiert sich Komponente A gleißend hell und weiß, B zeigt sich gut abgesetzt westlich von A - zurück auf 32x habe ich bei der Strahlkraft von A keine Chance mehr, B zu erkennen - sehr schick ab 64x
Stefan Loibl
Rosenheim (Germany)
102mm (68x) Faint component B is not visible at 26x. At 68x B is visible and split. Component A yellowish. ../projects/double-stars/stefan-loibl/sketches/DeltaHer_20200601.jpg
Robert Zebahl
Leipzig (Germany)
102mm (86x) Easy. Pretty wide apart with large difference in brightness. ../projects/double-stars/robert-zebahl/sketches/2019-06-23_delta_her.jpg
Mark McCarthy
Fremont (California/USA)
203mm (667x) Very bright yellow white A and bluish B at least four delta mag, wide separation. I don't think it would be seen but for the mask tightening A's diffraction
Mark McCarthy
Fremont (California/USA)
317mm (553x) Sarin. Very bright and much fainter B, looks like a planet
Karsten Kopp
Köln (Germany)
600mm (180x) Doppelstern gut zu trennen. Der Reiz von diesem Doppelstern liegt im schon extremen Helligkeitsunterschied von über 5 mag. Komponente A erstrahlt weiß und die Komponente B leicht rötlich.
omicron Oph, 39 Oph, H3 25 5m2 6m6 10.8'' 355° 2019 Oph 17h18m00.71s -24°17'12.80"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) Farbkontrast wohl wegen südl.Stellung nicht zu sehen ../projects/double-stars/frederik-wanink/sketches/OmiOph.jpg
STF2161, 75 Her, rho Her AB 4m5 5m4 4.1'' 321° 2019 Her 17h23m40.97s +37°08'45.30"
Robert Zebahl
Leipzig (Germany)
55mm (38x) Very nice view. Easily split with visible difference in brightness. Pretty tight. Component A appeared rather white, B slightly yellowish. The double star forms with two other, fainter field stars a conspicuous, acute-angled triangle, whereby the double star marks the tip.
René Merting
Drachhausen (Germany)
100mm (64x) bei 107x sind beide Komponenten klar getrennt erkennbar - Komponente B im NW ist eine knappe Größenklasse schwächer - A creme-weiß, B kühler weiß-bläulich - zurück auf 64x kann ich den Doppelstern auch schon ganz knapp getrennt erkennen, da war ich wohl nicht mutig genug, dass ich mit 107x begonnen habe
Sarah Gebauer
Germany
150mm (170x) der typische Doppelstern für mich, er bildet mit zwei ählich hellen Sternen ein schönes, langes und spitzes Dreieck ../projects/double-stars/sarah-gebauer/sketches/20200723%20Rho%20Her%20DSk.jpg
Mark McCarthy
Fremont (California/USA)
203mm (667x) Rho Her. Light yellow white stars 1 delta mag well separated.
STF2166 7m2 8m6 27.2'' 282° 2015 Oph 17h27m52.25s +11°23'25.80"
Uwe Pilz
Leipzig (Germany)
105mm (88x) trennbar bei 22x ../projects/double-stars/uwe-pilz/sketches/191025_STF2166.jpg
Mark McCarthy
Fremont (California/USA)
203mm (333x) White and slight off-white wide separation B.
★★ STFA35, nu Dra, nu 1/2 Dra, 24/25 Dra 4m9 4m9 62.1'' 311° 2017 Dra 17h32m15.88s +55°10'22.10"
Christopher Hay
Seeheim (Germany)
3x63 Hair-fine split.
A physical double at a distance to us of 99 light years.
Christopher Hay
Seeheim (Germany)
7x45 Well split and very compact. A very evenly matched pair, both colourless. Attractive in 8.6° FOV together with the rest of the head of the dragon, namely Beta, Gamma and Xi Dra (Rastaban, Etamin, Grumium).
Christopher Hay
Seeheim (Germany)
10x42 Clearly split, components of identical brightness, no colour. One of the finest doubles for 10x.
René Merting
Drachhausen (Germany)
16x70 der Doppelstern ist bereits mit bloßem Auge zu erkennen, im FG dann offenbart sich ein ordentlich getrenntes Pärchen zweier gleich heller Sterne
René Merting
Drachhausen (Germany)
18x70 zwei sehr helle reinweiße Sterne, komfortabel voneinander getrennt - sehr auffällig
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein schönes, auffallendes Pärchen zweier gleich heller Sterne - beide sind komfortabel getrennt erkennbar und präsentieren sich weiß
Robert Zebahl
Leipzig (Germany)
102mm (28x) Wide, bright, equal pair. Both components looked cream-white. Due to the distance a double for binoculars.
Christopher Hay
Seeheim (Germany)
125mm (80x) Gorgeous sight, widely split, dominating the FOV. The more northern B-component (=Nu1 Dra = 24 Dra) appears brighter and more yellowish than the A-component (=Nu2 Dra = 25 Dra).
Sarah Gebauer
Germany
150mm (85x) auf den ersten Blick "zwei Augen", die mich anleuchten, ansonsten aufgrund der wenigen Feldsterne eher unspektakulär ../projects/double-stars/sarah-gebauer/sketches/20200624%20Ny%20Dra%20DSk.jpg
STFA34, 53 Oph AB 5m8 7m5 41.3'' 190° 2019 Oph 17h34m36.69s +09°35'12.20"
AC 5m8 11m9 96.6'' 343° 2013
AD 5m8 12m0 126.8'' 213° 2013
BD 7m5 12m0 90.6'' 223° 2015
René Merting
Drachhausen (Germany)
16x70 AB: gut getrenntes Pärchen, bei dem Komponente B im Süden deutlich schwächer und grau gegenüber A wirkt
René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 20x weit getrenntes helles Pärchen, wobei Komponente B im Süden gut 1.5 Größenklassen schwächer - Komponente weiß-gelb, B gräulich
Uwe Pilz
Leipzig (Germany)
105mm (88x) AB: weiß und blaugrau. Trennbar bei 22x ../projects/double-stars/uwe-pilz/sketches/191025_53Oph.jpg
STF2191 AB 7m8 8m5 26.4'' 267° 2018 Oph 17h39m47.28s -04°58'04.80"
Uwe Pilz
Leipzig (Germany)
16x70 schwierig aber sehenswert ../projects/double-stars/uwe-pilz/sketches/200725_STF2191.jpg
Mark McCarthy
Fremont (California/USA)
203mm (667x) Wide separation near equal (AB seen. BC is Ho 419 12.71 7.6" not seen)
STF2203 7m7 7m8 0.8'' 292° 2018 Her 17h41m13.81s +41°39'17.80"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF2203.jpg
★★ STF2202, 61 Oph AB 6m1 6m5 20.8'' 93° 2019 Oph 17h44m34.09s +02°34'45.90"
René Merting
Drachhausen (Germany)
8x30 die B-Komponente ist östlich von A erkennbar, lässt sich aber noch nicht trennen - eine klassische Ameise
René Merting
Drachhausen (Germany)
10x35 ein richtig schöner Doppelstern für 10-fache Vergrößerung - zwei gleich helle Sterne, knapp getrennt
René Merting
Drachhausen (Germany)
10x50 ein ausgesprochen schönes knapp getrenntes Sternpaar - beide Sterne sind in etwas gleich hell - Komponente B im Osten ist nicht ganz so weiß wie A
René Merting
Drachhausen (Germany)
16x70 ein schön eng stehendes Pärchen, knapp getrennt - Komponente A im Westen ist nur leicht heller als B - beide Komponenten wirken weiß
Uwe Pilz
Leipzig (Germany)
16x70 beide gelb ../projects/double-stars/uwe-pilz/sketches/200725_61Oph.jpg
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x leicht zu trennen - Komponente B im Osten ist nur minimal schwächer (keine halbe Größenklasse, denke ich) - Komponente A stahlt ein wenig wärmer als B
Sarah Gebauer
Germany
150mm (30x) bei geringer Vergrößerung (30x) schon sauber getrennt, beide Sterne wirken gleich groß und gleich hell, ein nettes Pärchen
Sarah Gebauer
Germany
150mm (54x) zwei nicht ganz enge Glanzpünktchen in einer eher uninteressanten Umgebung
Mark McCarthy
Fremont (California/USA)
203mm (667x) Half delta mag wide separation white.
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/61%20Ophiuchi.png
★★★ S694 6m7 7m3 79.3'' 238° 2018 Oph 17h52m05.20s +01°06'40.30"
Uwe Pilz
Leipzig (Germany)
16x70 gelbweiß und blau; identisch WDS1752+0107 ../projects/double-stars/uwe-pilz/sketches/200725_S694.jpg
★★ STF2308 40/41 Dra AB 5m7 6m0 18.7'' 232° 2019 Dra 18h00m09.07s +80°00'13.70"
AC 5m7 8m3 225.3'' 129° 2017

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

Robert Zebahl
Leipzig (Germany)
8x44 2020-06-27: The pair AB split, but very tight with components of equal brightness. In acute angle far apart the component C was also visible.
Christopher Hay
Seeheim (Germany)
15x45 AB: Clearly split, brighter component seems bluish. One of the finest doubles for 15x, hence my two-star rating. In 10x42 a difficult split at the limit.
René Merting
Drachhausen (Germany)
16x70 ein schön eng stehendes Pärchen, die Himmelsrichtungen erschließen sich mir hier leider nicht, aber die Komponenten sind beide ähnlich hell und weiß - schöner Anblick im Fernglas
Christopher Hay
Seeheim (Germany)
50mm (8x) AB: An elongated figure-8 very close to splitting
Christopher Hay
Seeheim (Germany)
80mm (30x) AB: Very clearly split, dominates the 2.5° FOV, with interesting sprinkling of fainter stars throughout the field.
Robert Zebahl
Leipzig (Germany)
102mm (28x) Very nice, slightly uneven pair. Components appeared yellowish-white. Beautiful surroundings. On the sketch the components A, B and C are visible. ../projects/double-stars/robert-zebahl/sketches/2019-06-30_40_41_dra.jpg
Uwe Pilz
Leipzig (Germany)
105mm (100x) AB: =40/41 Dra. Auffallend
Christopher Hay
Seeheim (Germany)
140mm (75x) AB: Wide apart, the pair absolutely dominates the field of view, with attractive sprinkling of fainter stars to the west. Very delicate colour contrast that was hard to grasp in 3-inch scope now becomes clear, component B (40 Dra) is bluish, component A (41 Dra) yellowish.
H6 2, 67 Oph AC 4m0 8m1 54.7'' 143° 2019 Oph 18h00m38.72s +02°55'53.70"
René Merting
Drachhausen (Germany)
10x35 zwischen beide Sterne passt maximal ein halbes Blatt Papier - C im Südosten kommt mir entgegen aller früheren Erfahrungen nicht so schwach vor wie sonst, ich würde hier nur auf maximal eine Größenklasse schätzen, eigenartig
René Merting
Drachhausen (Germany)
10x50 ein einfacher Doppelstern - Komponente C steht mit gutem Abstand südöstlich von A - Komponente A ist gleißend weiß, C wirkt dagegen richtiggehend grau-braun
Christopher Hay
Seeheim (Germany)
15x45 AC: Stabilised binoculars, handheld. Components wide apart, almost too wide to appear as a double star. Secondary a fine speck of light beside the primary, which is >4mag brighter. According to Stelledoppie a true physical pair at a distance of 1230 light years. It is interesting to contemplate that at this distance in space the companion still looks so separate. “H“ in the catalogue name means that this double star is listed in the catalogue of W. Herschel. The 6 in the name means that it is a double star of the 6th Class [separation 1’ or larger] in Herschel’s system.
René Merting
Drachhausen (Germany)
16x70 auf den ersten Blick bin ich enttäuscht, weil ich nur einen hell strahlenden Stern erkennen kann - dann aber mit etwas Konzentration ist südöstlich von der Leuchtgranate ein ganz schwacher Begleiter zu erkennen - ein sehr ungleiches Paar mit geschätzt 4 Größenklassen Unterschied - Komponente C wirkt rotbraun und steht ordentlich getrennt von A
Uwe Pilz
Leipzig (Germany)
16x70 der helle ist gelb-weiß ../projects/double-stars/uwe-pilz/sketches/200725_67Oph.jpg
Christopher Hay
Seeheim (Germany)
25x80 Very far apart, almost so far as to appear to not belong together. However, in the 3° field of view 70 Ophiuchi, which is also a physical double, is seen to be also split. Thus a very attractive field overall.
67 Oph and 70 Oph are the left and right nostrils of the bull in the old constellation Taurus Poniatowski (Poniatowski’s Bull). 68 Oph (the tip of the bull’s nose) and 73 Oph (the bull’s right eye) are also double stars, but can’t be split at 25x. All four doubles – 67, 68, 70 and 73 Oph – are physical, a rare assemblage!
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x großer Abstand zwischen beiden Sternen - weil Komponente A so gleißend hell strahlt, fehlt der mindestens um 3 Größenklassen schwächeren Komponente C im SO die Farbe, eher gräulich
STF2264, 95 Her 4m8 5m2 6.4'' 257° 2019 Her 18h01m30.41s +21°35'44.80"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x mein erster Eindruck ist, dass zwei annähernd gleichhelle sehr eng stehende Sterne mich wie zwei Augen anschauen, das unmittelbare Sternumfeld passt schön und verleiht dem Doppel eine hervorgehobene Stellung - Komponente B im Westen ist nur minimal schwächer als A - in guten Momenten ist die Trennung sehr eindeutig erkennbar
René Merting
Drachhausen (Germany)
100mm (64x) bei 64x zwei helle, knapp getrennte Sterne - die schwächere westliche Komponente zeigt ein schönes, helles Gelb und wirkt dadurch leicht schwächer - zurück auf 32x ist eine 8 mit deutlicher Einschnürung erkennbar - der Farbunterschied ist ebenfalls deutlich
Uwe Pilz
Leipzig (Germany)
105mm (288x) ../projects/double-stars/uwe-pilz/sketches/95Her.jpg
Karsten Kopp
Köln (Germany)
140mm (94x) Konnte erst mit 94-facher Vergrößerung gut getrennt wahrgenommen werden.
Sarah Gebauer
Germany
150mm (54x) zwei enge, hübsche Glanzpünktchen, die ich zuvor ziemlich lange in dem hellen Sterntrapez gesucht habe
Robert Zebahl
Leipzig (Germany)
152mm (49x) 2020-06-23: At 49x eye catching double star, relatively tight with rather small difference in brightness. Beautiful color impression, which was even better visible at 69x: yellowish and yellowish-orange.
Mark McCarthy
Fremont (California/USA)
508mm (667x) 95 Her. Orange and blue, wide, bright.
Karsten Kopp
Köln (Germany)
600mm (135x) Sehr einfaches und auffälliges Objekt. Kein Helligkeitsunterschied erkennbar.
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/95%20Her.jpg
Berthold Fuchs
Wiesbaden (Germany)
130mm close DS ../projects/double-stars/berthold-fuchs/photographs/95%20Herculis.png
STF2262, tau Oph AB 5m3 5m9 1.5'' 290° 2019 Oph 18h03m04.91s -08°10'48.90"

../images/binary-star-orbits/STF2262-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (240x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF2262.jpg
70 Oph, P Oph, STF2272 AB 4m2 6m2 6.6'' 122° 2019 Oph 18h05m27.37s +02°29'59.30"

../images/binary-star-orbits/STF2272-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
16x70 nicht einfach; der helle ist gelb ../projects/double-stars/uwe-pilz/sketches/200725_70Oph.jpg
Christopher Hay
Seeheim (Germany)
25x80 Clean split, component A appears yellowish.
70 Oph is the left nostril of the bull in the old constellation Taurus Poniatowski (Poniatowski’s Bull). On the connections to 67, 68 and 73 Oph see the entry on 67 Oph.
René Merting
Drachhausen (Germany)
100mm (64x) bei 32x wirkt der Stern nicht rund, sondern ein wenig nach SO verschmiert - bei 64x dann eindeutig ein knapp getrenntes schön anzusehendes Pärchen - Komponente A hell-gelb, B orange-gelb
Jörg S. Schlimmer
Germany
127mm (136x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung%2070%20Oph_filtered_96dpi.jpg
Sarah Gebauer
Germany
150mm (85x) ein ganz leicht goldener Farbeindruck des Sternpaares, die Sterne stehen recht dicht beisammen und sind dennoch schön getrennt ../projects/double-stars/sarah-gebauer/sketches/20200805%2070%20Oph%20DSk.jpg
Robert Zebahl
Leipzig (Germany)
200mm (80x) Conditions in the target region: SQM-L 20.1
Well split at 80x. Brighter component appeared white, fainter one slightly orange.
Berthold Fuchs
Wiesbaden (Germany)
130mm difficult DS ../projects/double-stars/berthold-fuchs/photographs/70%20Ophiuchi.png
★★ STF2280, 100 Her AB 5m8 5m8 14.3'' 183° 2019 Her 18h07m49.56s +26°06'04.40"
René Merting
Drachhausen (Germany)
10x35 ein 8, eine Einschnürung ist ab und an erkennbar - Trennung nicht möglich
René Merting
Drachhausen (Germany)
10x50 zwei extrem dicht stehende helle Sterne - noch nicht getrennt, aber schön als 8 erkennbar
Robert Zebahl
Leipzig (Germany)
16x70 2020-07-05: Very nice, rather isolated double star. Striking. Similar bright component, both white.
René Merting
Drachhausen (Germany)
18x70 perfekt für 18-fache Vergrößerung - zwei gleich helle, dicht zusammen stehende Sterne - reinweiß und sehr auffällig, weil keine ähnlich hellen Sterne im Umfeld zu sehen sind
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x ein schönes, enges Pärchen zweier gleichheller Sterne - beide gleich hell und reinweiß - zurück auf 20x zeigen sich beide Protagonisten weiterhin ganz knapp getrennt - Komponente B im Süden wirkt leicht gelblich und schwächer
Uwe Pilz
Leipzig (Germany)
105mm (26x) Weiß-orangeweiß
Robert Zebahl
Leipzig (Germany)
120mm (40x) Conditions in the target region: SQM-L 20.5
Very nice, evident double star with equally bright components.
Karsten Kopp
Köln (Germany)
140mm (94x) Doppelstern ist einfach zu trennen. Das besondere ist hier, dass die beiden Sterne recht alleine zu stehen scheinen. Beide erscheinen weiß.
Sarah Gebauer
Germany
150mm (54x) zwei hübsche Glanzpünktchen, die mich an ein Knöpflein mit zwei Löchern erinnern, der "typische" DS für mich: nicht zu eng, nicht zu weit, gleich hell, sehr nett ../projects/double-stars/sarah-gebauer/sketches/20200805%20100%20Her%20DSk.jpg
Robert Zebahl
Leipzig (Germany)
152mm (22x) Beautiful view. Easy to separate with components of the same brightness. It is noticeable that there are no brighter stars in the immediate vicinity, so that the double star stands out very well.
Mark McCarthy
Fremont (California/USA)
203mm (205x) 100 Her. Bright equal wide yellow-white stars. [not physical]
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/100%20Herculis.png
STF2281, 73 Oph AB 6m0 7m5 0.8'' 283° 2019 Oph 18h09m33.86s +03°59'35.80"

../images/binary-star-orbits/STF2281-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) als 8 zu sehen, schwierig ../projects/double-stars/frederik-wanink/sketches/73Oph.jpg
★★ 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.
STF2289 6m7 7m2 1.2'' 218° 2019 Her 18h10m08.69s +16°28'35.00"

../images/binary-star-orbits/STF2289-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) Just split in 20" at 205x, but flaring. 333x had messy diffraction. 8" mask at 333x gave clean disks, split, ~0.7". Dull yellow and yellow-red colors.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) Hauptstern gelb, Begleiter scheint bläulich ../projects/double-stars/frederik-wanink/sketches/STF2289.jpg
★★★ BU641 7m0 8m7 0.8'' 341° 2015 Her 18h21m48.44s +21°30'27.90"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) sehr schwierig ../projects/double-stars/frederik-wanink/sketches/BU641.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Extraordinary! Moderately bright A and very much fainter B, 4-5 delta mag, <1" separation. Seeing needs to still.
Mark McCarthy
Fremont (California/USA)
508mm (533x) V989 Her. Seen as a snowman dot to bright white A @ 333x, split with 533x, inside first diffraction ring. Need A's disk to be perfectly tight for B to resolve with seeing. Very nice. 1" at discovery 1878 with Dearborn 18.5-inch
STF2323, 39 Dra AC 5m1 8m0 88.9'' 20° 2017 Dra 18h23m54.65s +58°48'02.10"
AB 5m1 8m1 3.8'' 348° 2018

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

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

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

Frederik Wanink
Itterbeck (Germany)
254mm (640x) als 8 zu sehen ../projects/double-stars/frederik-wanink/sketches/STF2315.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) ! Hairline split @ 553x near equal mag. Suspected elongation at 277x.
Mark McCarthy
Fremont (California/USA)
508mm (533x) Barely split with seeing, resolves to two disks, more than hairline but almost 2 delta mag, very tough, need perfect seeing. 2094 year period
STT351 & HU66 HU66 AB 7m9 8m4 0.2'' 197° 2016 Dra 18h25m18.20s +48°45'42.50"
STT351 AC 7m9 8m2 0.8'' 26° 2019
HU66 BC 8m4 8m2 0.8'' 26° 2019

../images/binary-star-orbits/HU66-AB-orbit.jpg ../images/binary-star-orbits/STT351-AC-orbit.jpg ../images/binary-star-orbits/HU66-BC-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (305x) STT351 (AC): Split, better with seeing, light orange stars, significant mag difference. Did not notice HU 66 AB, 7.9/8.4 0.1" or HU 66 BC, 8.40/8.25 0.9 -- need to go back to this one!
Frederik Wanink
Itterbeck (Germany)
254mm (640x) HU66 (BC): getrennt ../projects/double-stars/frederik-wanink/sketches/HU66.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) HU66 (BC): Very fine near equal pair, yellowish A and blue-white B. ~1" or less.
Mark McCarthy
Fremont (California/USA)
508mm (333x) STT351 (AC): Orange stars, noticeable magnitude difference ~0.5, separated just less than ~1". What's curious is the AB pair is HU 66 AB listed as 7.90/8.40 0.1" currently, with HU 66 BC as 8.40/8.25 0.9". So my question is, if AC is physical, and if BC are physical too, why is AC uncertain? It would seem they should all be sharing orbits? Perhaps it just cries out for additional measures -- AB is grade 4 and BC is grade 5, so they are confident of physicality but there's not enough data to nail it down.
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.
★★ STT359 6m3 6m6 0.7'' 2019 Her 18h35m30.40s +23°36'19.90"

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

Robert Zebahl
Leipzig (Germany)
102mm (160x) 2020-11-10: Clearly elongated with slight notching and little difference in brightness. I estimated the position angle to 0°.
Uwe Pilz
Leipzig (Germany)
105mm (198x) leicht eingekerbt, Abstand 0“75 ../projects/double-stars/uwe-pilz/sketches/stt359.jpg
Mark McCarthy
Fremont (California/USA)
203mm (667x) Kissing 8" 333x, hairline split 667x. Near equal white A and bluish white B.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STT359.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Nice! ~0.8" equal yellow-orange stars.
Uwe Pilz
Leipzig (Germany)
320mm (388x) ein sehr ruhiger Abend gestattete die Nutzung von 12 Zoll ../projects/double-stars/uwe-pilz/sketches/200808stt359.jpg
Mark McCarthy
Fremont (California/USA)
508mm (333x) Light yellow near equal split, very close. 219 year period
STF2349 AB 5m4 9m4 7.2'' 204° 2016 Lyr 18h36m37.34s +33°28'08.50"
Robert Zebahl
Leipzig (Germany)
102mm (125x) Easy to split with a clear difference in brightness. The companion only appeared as a tiny star. ../projects/double-stars/robert-zebahl/sketches/2019-06-23_stf2349.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) ../projects/double-stars/uwe-pilz/sketches/stf2349.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) viel schwieriger, als es die Daten vermuten lassen (7") ../projects/double-stars/uwe-pilz/sketches/191031STF2349.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Bright white and faint ruddy B, fairly close ~4".
★★ alpha Lyr, 3 Lyr, Vega H5 39 AB 0m1 9m5 83.7'' 184° 2017 Lyr 18h36m56.33s +38°47'01.20"
STFB9 AC 0m1 11m0 76.0'' 255° 2012
STFB9 AE 0m1 9m5 86.6'' 39° 2017
Jörg S. Schlimmer
Germany
127mm (203x) um Vega mehrere Beugungsringe sowie Speckles sichtbar, B leicht zu sehen, E nicht sichtbar ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Vega_20190626_ausschnitt_filtered.jpg
Jörg S. Schlimmer
Germany
127mm (203x) verschiedene Vergrößerungen zwischen 40 und 203 fach, Komponente E zeitweise bei indirektem Sehen sichtbar, da Himmel heute klarer ist ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Vega_20190627_ausschnitt_filtered.jpg
STT363 7m5 8m1 0.6'' 336° 2018 Dra 18h37m23.92s +77°41'12.40"

../images/binary-star-orbits/STT363-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) als 8 zu sehen ../projects/double-stars/frederik-wanink/sketches/STT363.jpg
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/STT%20363.jpg
STF2372 AB 6m5 7m7 25.0'' 82° 2019 Lyr 18h42m08.09s +34°44'46.70"
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x weit getrennt, bei 64x noch weiter getrennt :-D, Komponente B halb so hell wie A und deshalb gräulicher
Uwe Pilz
Leipzig (Germany)
105mm (88x) weiß und blaugrün, erkennbar bei 21x ../projects/double-stars/uwe-pilz/sketches/191031STF2372.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Yellow-green A and slightly blue-white B. 1 delta mag, very wide.
★★★ epsilon Lyr STFA37 AB-CD 4m7 4m6 209.5'' 172° 2016 Lyr 18h44m20.34s +39°40'12.40"
STFA37 AI 5m2 10m1 149.5'' 137° 2015
STF2382, 4 Lyr, epsilon 1 Lyr AB 5m2 6m1 2.2'' 345° 2019
STF2383, 5 Lyr, epsilon 2 Lyr CD 5m2 5m4 2.4'' 74° 2019

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

Christopher Hay
Seeheim (Germany)
naked eye While waiting for Comet Neowise at 3 in the morning in July 2020 surprised myself with my first naked-eye separation of Alpha1 und Alpha2 Capricornis (observing site at 50° northern latitude, Alpha1/2 passing through meridian). Encouraged by this, I lay down and had a close look at Epsilon Lyrae, without really expecting to be able to split it naked-eye, having never succeeded previously. At first Epsilon Lyrae appeared as a very short dash of light. Then the dash resolved into two pinpoints. After 15 years in the hobby and at age 60, at last got Eps Lyr split! No precise prior PA knowledge. After memorising PA as seen naked-eye carefully, confirmed it with binoculars. Eps Lyr is the third-easiest physical double in the (northern hemisphere) summer sky for the naked eye, after Zeta UMa (much easier) und Alpha Lib (marginally easier).
Christopher Hay
Seeheim (Germany)
2x54 AB-CD: Clean split. Actually more pleasant than in 4x10 binoculars, presumably due to more steady handheld view.
Robert Zebahl
Leipzig (Germany)
55mm (59x) STF2382 (AB): At 42x slightly elongated, at 59x elongated and obviously notched.
Robert Zebahl
Leipzig (Germany)
55mm (59x) STF2383 (CD): At 42x clearly elongated, but without any visible notch. At 59x split with touching diffraction disks.
Robert Zebahl
Leipzig (Germany)
70mm (57x) STF2382 (AB): Obviously seen as figure '8'.
Robert Zebahl
Leipzig (Germany)
70mm (57x) STF2383 (CD): Split, but extremely tight with almost touching diffraction disks.
René Merting
Drachhausen (Germany)
76mm (95x) AB-CD: bei 29x schön getrennt erkennbar, ohne dass sich AB und CD schon trennen lassen
AB: bei 57x leicht länglich mit kleiner Einschnürung - bei 95x schön eng getrennt, B nördlich wirkt etwas schwächer- bei 127x wunderschön, das Sternpaar hat zwei Beugungsscheibchen, die wie ein Heiligenschein um die beiden Sterne stehen
CD: bei 57x eine 8 - bei 95x ein schön eng getrenntes Pärchen gleichheller Sterne - bei 127x wunderschön, das Sternpaar hat zwei Beugungsscheibchen, die wie ein Heiligenschein um die beiden Sterne stehen
EF und I: bei 127x sind alle drei Sterne (I 10.1 mag / E 12.3 mag / F 12.7 mag) erkennbar
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 64x ist das Sternpaar mit leichter Einschnürung und Nord-Süd-Ausdehnung erkennbar - beide Sterne stehen minimal enger zusammen als das südlichere Paar CD - bei 107x knappe Trennung, Komponente B nördlich ist mindestens eine halbe Größenklasse schwächer als A
CD: bei 64x als 8 mit Ost-West-Ausdehnung erkennbar - bei 107x knapp getrennt, beide Komponenten sind etwa gleich hell
Sarah Gebauer
Germany
100mm (136x) ein Test mit dem neuen Refraktor, um einen Vergleich zum 6''-Newton zu ziehen: bei 136x schon astrein getrennt, natürlich ziemlich eng und ganz fein getrennt, aber dennoch ein überraschend positives Ergebnis
Robert Zebahl
Leipzig (Germany)
102mm (125x) Stunning view of the components A-D and I! ../projects/double-stars/robert-zebahl/sketches/2019-06-26_epsilon_lyr.jpg
Uwe Pilz
Leipzig (Germany)
105mm (26x) bei 22x nicht trennbar ../projects/double-stars/uwe-pilz/sketches/epsLyr2.jpg
Jörg S. Schlimmer
Germany
127mm (203x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Epsilon-Lyrae_ausschnitt_filtered.jpg
Sarah Gebauer
Germany
150mm (250x) August 2019 zum ersten Mal die nah beieinanderstehenden Komponenten sauber getrennt, ein grandioser Doppel-Doppel-Anblick
Winfried Kräling
Marburg (Germany)
152mm (175x) ../projects/double-stars/winfried-kraeling/sketches/2021-07-23-2025UT-Epsilon%20Lyrae.jpg
René Merting
Drachhausen (Germany)
320mm (144x) bei 144x sind die Komponenten von AB und CD gerade so getrennt voneinander erkennbar, sie tanzen wie wild miteinander - mit Arperturmaske und Abblendung auf 120 mm zeigen die vier nun deutlich schwächeren Sterne schöne Beugungsscheibchen und sind besser getrennt voneinander sichtbar
Uwe Pilz
Leipzig (Germany)
320mm (200x) 7 Komponenten!! A-B-C-D-E-F-I ../projects/double-stars/uwe-pilz/sketches/epsLyr.jpg
Berthold Fuchs
Wiesbaden (Germany)
130mm Double-Double ../projects/double-stars/berthold-fuchs/photographs/epsilon%20Lyrae.png
STFA38, zeta Lyr, zeta 1/2 Lyr AD 4m3 5m6 43.7'' 150° 2018 Lyr 18h44m46.36s +37°36'18.40"
Christopher Hay
Seeheim (Germany)
10x42 Clearly separated. Colour contrast between bluish A and orangish D is there if one knows it, but not as striking as in 15x45 binoculars.
Christopher Hay
Seeheim (Germany)
15x45 Component A clear blue-white, component D very pale tangerine orange. Wide split. Colour contrast seems even greater than that of nearby Delta 1/2 Lyrae. Physical double.
René Merting
Drachhausen (Germany)
76mm (29x) bei 29x ein schön getrenntes Pärchen - D im Südosten ist 1.5 Magnituden schwächer und wirkt blaugrau gegen die weißgelbe A-Komponente
Mark McCarthy
Fremont (California/USA)
80mm (13x) Zeta 2 Lyr. Slightly greenish-white stars. Best view in finder, cleaner. Wide, 1 delta mag.
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x weit getrennt, Komponente A weißlich, D leicht gelblich
Uwe Pilz
Leipzig (Germany)
105mm (88x) weiß-orange ../projects/double-stars/uwe-pilz/sketches/zetaLyr.jpg
Sarah Gebauer
Germany
150mm (85x) weit getrennt, unspektakulär
Mark McCarthy
Fremont (California/USA)
152mm (175x) Wide, white-yellow stars, one delta
Winfried Kräling
Marburg (Germany)
152mm (175x) ../projects/double-stars/winfried-kraeling/sketches/2021-07-23-2045UT-Zeta%20Lyrae.jpg
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/Zeta%20Lyrae.jpg
STF2390 7m4 8m6 4.3'' 155° 2016 Lyr 18h45m49.83s +34°31'06.60"
René Merting
Drachhausen (Germany)
100mm (64x) bei 64x ploppt Komponente B knapp getrennt auf, vorher war sie unsichtbar - Farben Fehlanzeige
Uwe Pilz
Leipzig (Germany)
105mm (88x) ../projects/double-stars/uwe-pilz/sketches/191031STF2390.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Orange and very wide separation B, 2x fainter B, bluish.
★★ beta Lyr, 10 Lyr, Sheliak STFA39 AB 3m6 6m7 45.7'' 149° 2017 Lyr 18h50m04.79s +33°21'45.60"
BU293 AE 3m6 10m1 67.2'' 317° 2015
BU293 AF 3m6 10m6 86.0'' 18° 2015
Christopher Hay
Seeheim (Germany)
10x42 AB: Stabilised binoculars, handheld. B is well apart from A and distinct. Very pretty!
Robert Zebahl
Leipzig (Germany)
70mm (22x) At 22x and 57x the components A, B, E and F were easily seen. The B component appeared slightly bluish-silver at 22x, but at 57x the color was difficult to tell. All four components form a slightly curved 'Y' with the bright A component in the center.
René Merting
Drachhausen (Germany)
76mm (18x) AB: bei 18x sind die beiden Sterne gut getrennt voneinander zu erkennen
EF: beide Komponenten zeigen sich bei 18x sehr schwach
René Merting
Drachhausen (Germany)
100mm (32x) AB: bei 32x sind die Komponenten A und B weit getrennt, B ist deutlich schwächer
EF: ebenfalls bei 32x machen zwei gleichhelle Fühlersterne (E und F) nördlich von Komponente A das System interessanter - sie sind noch schwächer als B - Farbe konnte ich bei keinem der vier Sterne erkennen
Robert Zebahl
Leipzig (Germany)
102mm (62x) Components A, B, E and F are easily visible. The two southern stars on the drawing do not belong to the system. ../projects/double-stars/robert-zebahl/sketches/2019-06-23_beta_lyr.jpg
Uwe Pilz
Leipzig (Germany)
105mm (139x) AB: Begleiter ist tiefrot; die Natur des Systems ist unsicher ../projects/double-stars/uwe-pilz/sketches/betaLyr.jpg
Uwe Pilz
Leipzig (Germany)
105mm (144x) schon sichtbar bei 26x, aber schwierig. A blauweiß, B orange. ../projects/double-stars/uwe-pilz/sketches/191031betaLyr.jpg
Jörg S. Schlimmer
Germany
127mm (108x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung-beta-Lyrae_filtered_96dpi.jpg
Sarah Gebauer
Germany
150mm (85x) AB: weit getrennt, viele helle Feldsterne
STF2404 6m9 7m8 3.7'' 181° 2019 Aql 18h50m45.55s +10°58'35.20"
Robert Zebahl
Leipzig (Germany)
70mm (44x) Already at 22x the double star is striking due to its orange color. At 44x split, but rather tight with a clear difference in brightness. At 100x the primary component appears in a bright orange, the secondary component shows a bluish tint.
Mark McCarthy
Fremont (California/USA)
203mm (667x) Light orange and light blue, pretty.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) beide gelblich ../projects/double-stars/frederik-wanink/sketches/STF2404.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) well split, yellow A and yellow-orange B.
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")
delta 2 Lyr, 12 Lyr, delta Lyrae Cluster, Stephenson 1 ES2028 AB 4m3 11m2 86.3'' 349° 2014 Lyr 18h54m30.29s +36°53'55.00"
ES2028 BC 11m2 11m6 2.1'' 135° 2008
SMR13 AD 4m5 8m8 193.1'' 210° 2014
SMR13 AE 4m5 10m3 400.6'' 238° 2014
SMR13 AF 4m5 8m8 369.4'' 245° 2014
SMR13 AG 4m5 9m8 335.9'' 261° 2014
SMR13 AH 4m5 8m7 229.4'' 284° 2014
SMR13 AJ 4m3 12m0 279.5'' 249° 2014
SMR13 AK 4m3 12m0 304.2'' 236° 2014
SMR13 HI 8m7 12m9 26.1'' 251° 2015
Jörg S. Schlimmer
Germany
305mm (94x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung-delta-Lyrae_filtered_96dpi.jpg
Mark McCarthy
Fremont (California/USA)
508mm (205x) ES2028 (BC): Delta 2 Lyr. ! Very cool. A is bright light orange, and BC are blue pinpoints, ~2" with a slight mag difference. Clearly and cleanly seen.
★★ STT525 & SHJ282 STT525 AB 6m1 9m1 1.8'' 130° 2015 Lyr 18h54m52.52s +33°58'06.90"
SHJ282 AC 6m1 7m6 45.4'' 350° 2018
SHJ282 AD 6m1 11m0 214.8'' 295° 2015
Christopher Hay
Seeheim (Germany)
10x42 SHJ282 (AC): Stabilised binoculars, handheld. Wide split, the A component yellowish. Alias South 282. According to Stelledoppie a physical double.
Robert Zebahl
Leipzig (Germany)
16x70 SHJ282 (AC): 2020-07-06: Easy, striking with reasonably apparent color contrast: yellowish to slightly orange & bluish.
Christopher Hay
Seeheim (Germany)
60mm (15x) SHJ282 (AC): Wide split. Blue colour of C component much more striking than the orange colour of the A component.
Robert Zebahl
Leipzig (Germany)
70mm (22x) SHJ282 (AC): Fairly bright and wide pair. The double star was conspicuous, especially in regard to its color: A appeared orange, C rather grey-bluish. It could be observed together with Messier 57 and beta & gamma Lyrae. Very nice.
René Merting
Drachhausen (Germany)
76mm (18x) SHJ282 (AC): bei 18x ist das Pärchen schon sehr auffällig - A ist hellgelb mit schönem Kontrast zur nördlich stehenden, gut getrennten B-Komponente - bei 57x präsentiert sich B in einem zarten stahlblau
Uwe Pilz
Leipzig (Germany)
105mm (21x) SHJ282 (AC): Orange und türkis ../projects/double-stars/uwe-pilz/sketches/191031SHJ282.jpg
Uwe Pilz
Leipzig (Germany)
105mm (180x) STT525 (AB): gelbweiß-blau
Christopher Hay
Seeheim (Germany)
125mm (23x) SHJ282 (AC): Widely split, dominates the field of view, very attractive. A component is tangerine orange, C component ice blue. An echo of Albireo. A true physical pair.
Christopher Hay
Seeheim (Germany)
180mm (200x) SHJ282 (AC): A is very distant from C but the two are still a fine pair. Colour of C is more striking than that of A, in a manner similar to my simultaneous observation with 60mm at 15x, but not quite as pronounced.
C has a companion set off from it by a hair of black. I estimate PA from C at approx. 80°, separation very roughly 2". Surprisingly can't find this companion in the double star catalogues.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) STT525 (AB): 3er System, sehr schwierig wegen Helligkeitsunterschied ../projects/double-stars/frederik-wanink/sketches/STT525.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) SHJ282 (AC): Wide separation orange and blue, 2 delta mag.
Frederik Wanink
Itterbeck (Germany)
254mm STT525 (AB) ../projects/double-stars/frederik-wanink/photographs/STT%20525.jpg
Claus-Dieter Jahn
Leipzig (Germany)
SHJ282 (AC): TS APQ 65/420mm, ZWO ASI 178mc, Livestack with Sharpcap, Exposure time: 1600x 0.6s ../projects/double-stars/claus-dieter-jahn/photographs/2020-04-07_shj282.jpg
STF2421 8m1 9m3 24.6'' 57° 2015 Lyr 18h56m01.68s +33°47'08.10"
René Merting
Drachhausen (Germany)
76mm (57x) bei 57x ein eher unauffälliges, ordentlich getrenntes Sternpaar - Komponente B im Nordwesten ist eine Magnitude schwächer
Uwe Pilz
Leipzig (Germany)
105mm (88x) orange und blaugrün ../projects/double-stars/uwe-pilz/sketches/191031STF2421.jpg
Uwe Pilz
Leipzig (Germany)
105mm (137x) recht weit, einfach
STF2417, theta Ser, 63 Ser, Alya AB 4m6 4m9 22.4'' 106° 2019 Ser 18h56m13.18s +04°12'12.90"
AC 4m6 6m8 421.0'' 58° 2007
René Merting
Drachhausen (Germany)
10x35 AB: wunderschön für diese Vergrößerung - zwei helle dicht beieinander stehende Sterne, knapp getrennt - die hellsten Sterne im Umfeld
René Merting
Drachhausen (Germany)
10x50 AB: zwei helle schneeweiße Sterne, knapp getrennt - B im Osten ist nur knapp schwächer - ein schönes enges Pärchen
René Merting
Drachhausen (Germany)
16x70 AB: ein gut getrennt zu sehendes Pärchen - beide Sterne stahlen weiß, Komponente B im Osten ist keine halbe Größenklasse schwächer
René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 20x ein auffälliges gut getrenntes Sternpaar - Komponente B östlich ist nur leicht schwächer und strahlt ein wenig warm-weißer
Sarah Gebauer
Germany
100mm (73x) AB: die mit deutlichem Abstand bei 73x getrennten Doppelsterne liegen wie in einem U aus recht gleich hellen Sternen und bilden dabei im Süden den unteren Bereich des Buchstabens ../projects/double-stars/sarah-gebauer/sketches/STF%202417.jpg
Stefan Loibl
Rosenheim (Germany)
102mm (102x) AB: wide pair, hardly any difference in brightness, wonderful field, double stars looks like an embedded pair of eyes
Berthold Fuchs
Wiesbaden (Germany)
130mm AB: easy DS ../projects/double-stars/berthold-fuchs/photographs/theta%20Ser.png
★★ STF2422 7m9 8m2 0.8'' 68° 2018 Her 18h57m07.83s +26°05'45.10"
Mark McCarthy
Fremont (California/USA)
203mm (333x) Excellent hairline split at 333x with eight inch. Near equal white stars. Picked them out in a crowded field, suspected elongation right away, split with seeing as I centered it in eyepiece, and from then it was a steady split
Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwieriger wegen schwacher Sterne ../projects/double-stars/frederik-wanink/sketches/STF2422.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very tight, <0.8", equal light orange, pretty faint.
STF2438 7m0 7m4 0.8'' 357° 2019 Dra 18h57m28.47s +58°13'30.00"

../images/binary-star-orbits/STF2438-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) leicht; beide gleich hell ../projects/double-stars/frederik-wanink/sketches/STF2438.jpg
Mark McCarthy
Fremont (California/USA)
508mm (333x) Hairline split, white stars, near equal. 261.6 year period, look how fast it will move in the years 2150-2160!
STT369 7m8 7m9 0.7'' 2018 Dra 19h07m06.37s +72°04'26.60"

../images/binary-star-orbits/STT369-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) zeitweilig gut erkennbar ../projects/double-stars/frederik-wanink/sketches/STT369.jpg
★★ STF2470 7m0 8m4 13.8'' 267° 2017 Lyr 19h08m45.20s +34°45'37.10"
Robert Zebahl
Leipzig (Germany)
16x70 2020-07-06: Striking with well visible brightness difference. Very nice together with STF2474, which gives a similar view. A double-double for binoculars.
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x knapp getrennt - wunderschönes Synchrontänzer-Doppel-Doppel zusammen mit STF2474 unmittelbar 10' südlich, weil A und B bei beiden Paaren mit gleichen Helligkeiten und Positionswinkel strahlen - A-Komponente von STF2470 knapp schwächer als A-Komponente von STF2470
Robert Zebahl
Leipzig (Germany)
102mm (40x) Striking, especially with STF 2474 in one visual field. The color of the components was not clearly visible. Worthwhile! Sketch see STF 2474.
Sarah Gebauer
Germany
150mm (85x) nach mehreren Anläufen dann gefunden und bei 85x wie ein Doppel-Doppel im Bild, sehr sehenswert, auch der Abstandsunterschied (13,8'' bei STF 2470 und 15,9'' bei STF 2474) ist zu erkennen ../projects/double-stars/sarah-gebauer/sketches/20200723%20STF2470-4%20DSk.jpg
★★ STF2474 AB 6m8 7m9 16.0'' 263° 2019 Lyr 19h09m04.35s +34°35'59.90"
Robert Zebahl
Leipzig (Germany)
16x70 2020-07-06: Striking with well visible brightness difference. Very nice together with STF2470, which gives a similar view. A double-double for binoculars.
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x knapp getrennt - wunderschönes Synchrontänzer-Doppel-Doppel zusammen mit STF2470 unmittelbar 10' nördlich, weil A und B bei beiden Paaren mit gleichen Helligkeiten und Positionswinkel strahlen - A-Komponente von STF2474 knapp heller als A-Komponente von STF2470 - bei 64x Komponente A ein wenig gelblich
Robert Zebahl
Leipzig (Germany)
102mm (40x) Pretty conspicuous, easy double star. Especially attractive with the nearby double star STF 2470, as both are very similar in brightness, distance and position angle. The color of both components appeared slightly yellowish-orange. ../projects/double-stars/robert-zebahl/sketches/2019-06-26_stf2470_stf2474.jpg
Sarah Gebauer
Germany
150mm (85x) nach mehreren Anläufen dann gefunden und bei 85x wie ein Doppel-Doppel im Bild, sehr sehenswert, auch der Abstandsunterschied (13,8'' bei STF 2470 und 15,9'' bei STF 2474) ist zu erkennen ../projects/double-stars/sarah-gebauer/sketches/20200723%20STF2470-4%20DSk.jpg
Christopher Hay
Seeheim (Germany)
150mm (96x) Widely separated. Component A yellowish, B light ice-blue. A true physical pair in 171 LY distance. Very attractive in field of view together with Struve 2470 about 10 arcseconds north. The components of each of the two Struves have almost the same position angles, similar separations and very similar delta-magnitudes. Struve 2470 is like an echo of 2474 but with no definite colour impression.
BU139 & STTA177, V338 Sge BU139 AB 7m1 8m0 0.6'' 136° 2017 Sge 19h12m34.45s +16°50'47.20"
STTA177 AC 7m1 8m0 98.4'' 276° 2017
BU139 AE 7m1 11m2 28.8'' 101° 2015
BU139 CD 8m0 11m2 138.9'' 269° 2015

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

Mark McCarthy
Fremont (California/USA)
80mm (13x) STTA177 (AC): Near equal wide pair split in finder
Mark McCarthy
Fremont (California/USA)
203mm (667x) BU139 (AB): At the very best moments of seeing, which were fleeting, saw kissing disks to hairline split. Suspected elongation at 205x & 333x.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) BU139 (AB): getrennt, schwierig, 0,6"? ../projects/double-stars/frederik-wanink/sketches/BU139.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) BU139 (AB): V338 Sge. Overlapping airy disks.
Mark McCarthy
Fremont (California/USA)
317mm (553x) STTA177 (AC): Very wide orange-yellow and blue, ~2-3 delta mag.
STT371 AB 7m0 7m5 0.9'' 161° 2018 Lyr 19h15m56.96s +27°27'21.40"
AB-C 7m0 9m8 47.2'' 269° 2019
René Merting
Drachhausen (Germany)
100mm (20x) AB-C: bei 20x ist Komponente C im Westen schwach erkennbar in einem ordentlichen Abstand zu Komponente AB
Robert Zebahl
Leipzig (Germany)
102mm (160x) 2021-08-20: At 28x the much fainter C component is clearly visible at quite a large separation. The tight pair AB showed up at 160x and 187x clearly elongated, partially as an '8'. A small difference in brightness could be guessed. Higher magnifications did not yield any gain. The air was only moderately steady (seeing 3/5).
Mark McCarthy
Fremont (California/USA)
203mm (333x) AB: Bright pair showed best masked down to 8-inches. Near equal, white stars, perfect!
Frederik Wanink
Itterbeck (Germany)
254mm (640x) AB: getrennt ../projects/double-stars/frederik-wanink/sketches/STT371.jpg
STF2497 7m7 8m5 29.3'' 356° 2019 Aql 19h20m01.09s +05°35'15.70"
René Merting
Drachhausen (Germany)
10x50 ein wenig Geduld war notwendig, aber dann zeigte sich Komponente B leicht abgesetzt nördlich von A - geringer Helligkeitsunterschied
René Merting
Drachhausen (Germany)
18x70 bei 18x ein ausgesprochen schickes Sternpaar - B zeigt sich nördlich von A gut getrennt, aber trotzdem noch eng seinem Partner stehend - Helligkeitsunterschied eine Dreiviertel Größenklasse - sonst gibt es kaum vergleichbare Sterne im Umfeld, so dass sich das Sternpaar schön prominent präsentieren kann
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x einfach trennbar, auffällig - das Sternpaar steht schön isoliert - B im Norden ist eine dreiviertel Größenklasse schwächer und grau, A dagegen ist strahlend weiß - zurück auf 20x ist der Doppelstern auch noch gut getrennt mit eingängigerem Farbkontrast
Sarah Gebauer
Germany
100mm (45x) auf der Suche nach dem PN NGC 6781 zufällig entdeckt, steht recht isoliert im 1,8° großen Gf. und ist bei 45x sehr deutlich getrennt, zwei feine Pünktchen beieinander ../projects/double-stars/sarah-gebauer/sketches/STF%202497.jpg
★★★ beta Cyg, 6 Cyg, Albireo, STFA43 AB 3m2 4m7 35.2'' 54° 2019 Cyg 19h30m43.29s +27°57'34.90"
Robert Zebahl
Leipzig (Germany)
8x40 Well split, but I didn't recognised any color.
René Merting
Drachhausen (Germany)
10x50 Komponente A ist gleißend hell und stroh-gelb, Komponente B ist deutlich schwächer leicht abgesetzt von A erkennbar und strahlt eigenartig mint-grün
Christopher Hay
Seeheim (Germany)
12x36 Well split. A golden-red, B cold blue. Gorgeous!
Robert Zebahl
Leipzig (Germany)
16x70 2020-07-06: Bright orange & white-bluish.
Robert Zebahl
Leipzig (Germany)
80mm (25x) One of the most beautiful double stars in the northern hemisphere. Differences in brightness and color (orange-blue) are brilliant! Even under urban conditions with small aperture an enjoyment!
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x stehen beide Sterne weit getrennt - Komponente A mit einem satten zitronen-gelb, Komponente B mit einem leichten Stich ins Blaue
Jörg S. Schlimmer
Germany
127mm (203x) easy to split ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Albireo_filtered_96dpi_127mm.jpg
Sarah Gebauer
Germany
150mm (116x) Erstbeobachtung August 2019: deutlicher Farbunterschied zwischen blau und sattem Gelb zu sehen
Jörg S. Schlimmer
Germany
305mm (170x) alle Komponenten einfach zu trennen ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_Albireo_filtered_96dpi_305mm.jpg
Werner E. Celnik
Rheinberg (Germany)
150mm ../projects/double-stars/werner-celnik/photographs/Albireo%202015-09-09%20Refr_150-1100%205DMkII%20ISO1600%20IDAS%20HDR_1s-2min%20kl.jpg ../projects/double-stars/werner-celnik/photographs/Albireo%202015-09-09%20Refr_150-1100%205DMkII%20ISO1600%20IDAS%20HDR_1s-2min%20cr%20kl.jpg
Werner E. Celnik
Rheinberg (Germany)
150mm ../projects/double-stars/werner-celnik/photographs/Albireo%20A9918-9920%20RGB%20A4%20mTxt%20kl.jpg
★★★ HN 84, V340 Sge 6m4 9m5 28.4'' 301° 2013 Sge 19h39m25.33s +16°34'16.00"
René Merting
Drachhausen (Germany)
12x50 verdammt schwer - Komponente B ist ganz schwach nordwestlich von A auszumachen - beide Sterne berühren sich noch
René Merting
Drachhausen (Germany)
16x70 beide Sterne präsentieren sich gut getrennt, nicht zu weit aber auch nicht zu nah - Komponente A meint es gut mit der Farbe gelb, bei Komponente B kann ich keine Farbe erkennen
Christopher Hay
Seeheim (Germany)
80mm (30x) Primary ruddy red, secondary wide apart but too faint for any colour impression. Straw-yellow Epsilon Saggitae half a degree to the west with its ice-blue eastern companion enhances the experience of colour contrast in the FOV and is actually more attractive than HN 84 with this aperture and power.
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x sind beide Komponenten weit getrennt - Komponente A auffällig gelb-orange, B dagegen grau-blau, ein schöner Farbkontrast, der sich bei 32x verstärkt
Sarah Gebauer
Germany
150mm (85x) Holden 84, eine sehr goldgelbe Komponente und in 28'' Abstand die zweite, sehr schwache und weiße Komponente mit einem Hauch von Blau, sehr, sehr schön!
Christopher Hay
Seeheim (Germany)
150mm (96x) Main component ruddy tangerine orange, companion wide apart and ice blue. The longer I look the stronger the colour contrast becomes, which is by no means normal in many doubles. Epsilon Saggitae in same 0.8-degree field of view is straw-yellow with a cold blue companion (a field star?) pointing away from Epsilon in the direction of HN 84. I can’t think offhand of a better colour-contrast pair that can be framed in this manner in the same FOV.
Sarah Gebauer
Germany
150mm (160x) die hellere Hauptkomponente ist deutlich und stark goldfarben, die zweite dagegen sehr schwach, silbrig und dumpf ../projects/double-stars/sarah-gebauer/sketches/HN84.jpg
KUI94 6m5 7m8 0.5'' 158° 2014 Cyg 19h41m57.63s +40°15'14.60"

../images/binary-star-orbits/KUI94-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) unsicher, 8förmig ../projects/double-stars/frederik-wanink/sketches/KUI94.jpg
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/KUI%2094.jpg
STT383 AB 7m0 8m3 0.8'' 15° 2014 Cyg 19h42m56.26s +40°43'18.30"

../images/binary-star-orbits/STT383-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STT383.jpg
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/STT%20383%20AB.jpg
STT384 AB 7m6 8m2 1.0'' 196° 2018 Cyg 19h43m47.09s +38°19'20.50"
AC 7m6 9m8 59.4'' 297° 2015
AD 7m6 10m8 116.0'' 294° 2015
René Merting
Drachhausen (Germany)
100mm (20x) AC: bei 20x weit getrenntes Pärchen - Komponente C ist deutlich schwächer als A
Frederik Wanink
Itterbeck (Germany)
254mm (640x) AB: deutliches Paar ../projects/double-stars/frederik-wanink/sketches/STT384.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Nice near equal ~1", rest of field angular with stars (AB seen, AC and AD in the field.)
Frederik Wanink
Itterbeck (Germany)
254mm AB ../projects/double-stars/frederik-wanink/photographs/STT%20384%20AB.jpg
STF2579, delta Cyg, 18 Cyg AB 2m9 6m3 2.7'' 215° 2017 Cyg 19h44m58.44s +45°07'50.50"

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

Robert Zebahl
Leipzig (Germany)
70mm (200x) At 100x only indicated. At 200x the much fainter companion is visible as a slightly elongated brightening on the first diffraction ring.
Uwe Pilz
Leipzig (Germany)
105mm (288x) blauweiß ../projects/double-stars/uwe-pilz/sketches/190726DeltaCygni.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Very bright white with ruddy B, ~4", 4 delta mag. Nice!
17 Cyg STF2580 AB 5m1 9m2 26.1'' 68° 2015 Cyg 19h46m25.60s +33°43'39.30"
STF2580 AC 5m1 9m4 107.9'' 126° 2013
WNO56 AF 5m1 8m5 792.0'' 235° 2002
STF2580 BG 9m2 8m6 817.6'' 236° 2010
STF2576 FG 8m5 8m6 13.2'' 155° 2019

../images/binary-star-orbits/STF2580-AB-orbit.jpg ../images/binary-star-orbits/STF2576-FG-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 20x locker getrennt - Komponente A satt gelb, B wegen des großen Helligkeitsunterschiedes gräulich-bräunlich
Robert Zebahl
Leipzig (Germany)
152mm (92x) 2021-07-24: At 30x the components A, B & C are easily visible, whereby A & B are still quite close together. The bright component A appears in a pale yellow. At 92x also the pair FG is separated easily and looks less belonging to the system because of the wide separation to the other components. All in all it is worth observing. ../projects/double-stars/robert-zebahl/sketches/2021-07-24_17-cyg.jpg
Winfried Kräling
Marburg (Germany)
152mm (175x) A, B & C ../projects/double-stars/winfried-kraeling/sketches/2021-07-23-2020UT-17%20Cygni.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) AB: 17 Cyg: Yellow and slightly red, well separated, 1 delta mag. (This is an amazingly complex system with 11 stars in all sorts of combinations. Why not just call it an open cluster?)
STT386 8m5 8m6 1.0'' 71° 2018 Cyg 19h48m16.51s +37°09'37.50"
Robert Zebahl
Leipzig (Germany)
152mm (270x) Clearly visible as a double star with touching diffraction disks. Not difficult.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) trotz schwacher Komp. gut zu sehen ../projects/double-stars/frederik-wanink/sketches/STT386.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Tight near equal, nice, split with seeing, ~1"
★★ STF2583, pi Aql AB 6m3 6m8 1.4'' 105° 2019 Aql 19h48m42.05s +11°48'57.30"
Stefan Loibl
Rosenheim (Germany)
102mm (205x) not fully split, seen as constricted '8'
Robert Zebahl
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.
Sarah Gebauer
Germany
150mm (160x) wieder ganz haarscharf getrennt, bildet ein großes, nettes Dreieck mit Feldsternen, gefällt mir wieder sehr gut! ../projects/double-stars/sarah-gebauer/sketches/20200731%20Pi%20Aql%20DSk.jpg
Sarah Gebauer
Germany
150mm (170x) bei 170x ganz, ganz knapp getrennt, ein haarfeiner, schwarzer Trennstrich ist zu sehen, eine geniale Grenzbeobachtung!
Mark McCarthy
Fremont (California/USA)
152mm (285x) Pi Aql. Very pretty near equal light blue stars, cleanly separated
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
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.
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/STT%20387.jpg
DJU4, 13 Vul 4m6 7m4 1.4'' 246° 2016 Vul 19h53m27.69s +24°04'46.60"

../images/binary-star-orbits/DJU4-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwierig wegen Helligkeitsunterschied ../projects/double-stars/frederik-wanink/sketches/13Vul.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) 13 Vul: Very bright white A and 3- delta mag B, ~1.5-2", west PA
STF2594, 57 Aql AB 5m7 6m3 36.3'' 171° 2019 Aql 19h54m37.65s -08°13'38.30"
René Merting
Drachhausen (Germany)
10x50 ein einfacher Doppelstern - schön getrennt - Komponente A strahlt etwas weißer (ich weiß, es gibt keine Steigerungsformen von Farben)
René Merting
Drachhausen (Germany)
16x70 ein ansehnliches gut getrenntes Sternpaar - Komponente B im Süden ist gut eine halbe Größenklasse schwächer - das Weiß von Komponente A wirkt etwas kühler, während B eher in einem wärmeren zarten creme-gelb strahlt
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x ein sehr auffälliges, komfortabel getrenntes Sternpaar - Komponente B im Süden ist eine halbe Magnitude schwächer - zurück auf 20x immernoch eine ordentliche Trennung, B wirkt jetzt etwas schmutziger weiß
Uwe Pilz
Leipzig (Germany)
105mm (22x) orange-blau
Uwe Pilz
Leipzig (Germany)
320mm (36x) ../projects/double-stars/uwe-pilz/sketches/211001_57AQL.jpg
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/57%20Aquliae.png
STF2605, psi Cyg, 24 Cyg AB 5m0 7m5 2.9'' 175° 2017 Cyg 19h55m37.82s +52°26'20.50"
Robert Zebahl
Leipzig (Germany)
70mm (100x) At 80x difficult. At 100x and 133x the fainter component was clearly visible as small, roundish, partly slightly oval brightening.
René Merting
Drachhausen (Germany)
100mm (107x) bei 107x knapp getrennt, A strahlt weiß mit einer schwachen Andeutung von gelb, B im Süden ist deutlich schwächer
Uwe Pilz
Leipzig (Germany)
105mm (96x) nicht schwierig ../projects/double-stars/uwe-pilz/sketches/psiCyg.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Yellow and ruddy, fairly wide, ~4" 2 delta mag.
BU1475 AB 7m8 9m5 10.4'' 113° 2015 Aql 19h57m53.70s -09°03'30.30"
CD 8m7 11m1 4.9'' 163° 2015
René Merting
Drachhausen (Germany)
76mm (29x) AB: bereits bei 29x ist B knapp abgesetzt südöstlich von A erkennbar - A ist schön weiß und B ist im Grunde so schwach (gut 1.5 mag schwächer), dass der Stern kupferbraun strahlt
Uwe Pilz
Leipzig (Germany)
320mm (121x) ../projects/double-stars/uwe-pilz/sketches/211001_BU1475.jpg
★★ 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.
STT395, 16 Vul 5m8 6m2 0.7'' 128° 2019 Vul 20h02m01.45s +24°56'16.80"

../images/binary-star-orbits/STT395-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (667x) 16 Vul. Hairline split at 8" 333x. At 667x I see a more definite split. It appears only half delta mag, rather than the 1 delta mag in Sky Tools. Nice star.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) fast getrennt, eher 8, ähnlich hell ../projects/double-stars/frederik-wanink/sketches/16Vul.jpg
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/16%20Vul.jpg
★★ SHJ314, V1676 Cyg AF 6m8 7m3 36.3'' 28° 2019 Cyg 20h05m57.32s +35°47'18.20"
AD 6m8 9m5 11.3'' 300° 2019
René 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
STF2644 6m9 7m1 2.6'' 206° 2019 Aql 20h12m35.09s +00°52'00.20"
Robert Zebahl
Leipzig (Germany)
70mm (57x) Very tight at 57x, but separable without noticeable difference in brightness. At 100x very small difference in brightness visible. The colors of both components appeared to be the same, but not clearly perceptible.
Stefan Loibl
Rosenheim (Germany)
102mm (102x) both components white at 102x, companion appears slightly reddish at 205x
Mark McCarthy
Fremont (California/USA)
203mm (333x) Close white stars, near equal, ~2.5"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) gleich hell, leicht ../projects/double-stars/frederik-wanink/sketches/STF2644.jpg
★★★ STFA50, omicron Cyg, 30/31 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.
Christopher Hay
Seeheim (Germany)
3x63 Self-built binoculars, hence the unusual specification.
Widely split, A (31 Cyg) light orange, D (30 Cyg) light blue.
Christopher Hay
Seeheim (Germany)
7x50 A-D: Widely split, A (31 Cyg) luminous orange-red, D (30 Cyg) luminous ice-blue. C set off from A as a fine speck of light.
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.
Christopher Hay
Seeheim (Germany)
15x45 A-D: Very wide apart but still perceived as belonging together. A (31 Cyg) orange-red, D (30 Cyg) ice-blue. C well set off from A and light ice-blue, like an echo of D. A delightful group of three for binoculars at this power, further accentuated by nearby orange Omicron2 Cygni. Both the brightnesses and colour hues of Omi1A and Omi2 appear practically identical.
Robert Zebahl
Leipzig (Germany)
16x70 2020-07-03: Fantastic sight. A: bright orange, D: white-bluish, C: light blue. Very beautiful field.
René 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.
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x sind alle drei Sterne weit getrennt und doch irgendwie zusammengehörend, Komponente A ist rapsgelb und am auffälligsten, 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
Sarah Gebauer
Germany
150mm (30x) die drei Komponenten plus Omicron2 bilden ein wunderschönes, sehr langes und spitzes Dreieck und zeigen dabei wundervolle Farben, Komponente A von o1 sowie o2 erscheinen schön gelblich, Komponente D von o1 hat einen deutlichen Blaustich im Weißen, wirklich ein sehr schönes Gesamtbild - auf Komponente C hatte ich nicht geachtet ../projects/double-stars/sarah-gebauer/sketches/20200731%20Omicron%20Cyg%20DSk.jpg
Sarah Gebauer
Germany
150mm (85x) dieses Mal nur die drei dicht beieinanderstehenden Komponenten A, C und D im Sichtfeld gehabt, Komponente A ist wieder deutlich gelbgold, C wirkt leicht bläulich und Komponente D wirkt dieses Mal eher weiß ../projects/double-stars/sarah-gebauer/sketches/20200805%20Omicron%20Cyg%20DSk.jpg
STF2658 AB 7m2 9m4 5.4'' 106° 2015 Cyg 20h13m40.74s +53°07'30.30"

../images/binary-star-orbits/STF2658-AB-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (107x) bei 107x ist Komponente B schwach erkennbar östlich von A, es ist schon ordentlich Luft zwischen den beiden - Helligkeitsunterschied 2 Magnituden
Uwe Pilz
Leipzig (Germany)
105mm (144x) orangegelb ../projects/double-stars/uwe-pilz/sketches/190726STF2658.jpg
STT403 & STF2657 STT403 AB 7m3 7m6 0.9'' 171° 2019 Cyg 20h14m21.53s +42°06'15.60"
STF2657 AC 7m3 9m8 11.6'' 32° 2015
René Merting
Drachhausen (Germany)
100mm (64x) STF2657 (AC): bei 64x zeigt sich C ganz schwach nordöstlich von A - mindestens 2 Größenklassen Helligkeitsunterschied - A ist reinweiß, bei C bin ich froh, dass ich C überhaupt erkennen kann
Uwe Pilz
Leipzig (Germany)
105mm (288x) STT403 (AB): schwierig
Robert Zebahl
Leipzig (Germany)
152mm (270x) STT403 (AB): 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) STT403 (AB): schwaches 3er System, getrennt ../projects/double-stars/frederik-wanink/sketches/STT403.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) STT403 (AB): 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) STT403 (AB): Dramatic near equal white, just split, ~1", with a third in the system 2x fainter and wide separation (Indeed a triple, as described.)
Frederik Wanink
Itterbeck (Germany)
254mm STT403 (AB) ../projects/double-stars/frederik-wanink/photographs/STT%20403%20AB.jpg
STF2664 8m1 8m3 27.8'' 322° 2019 Del 20h19m38.48s +13°00'17.20"
René Merting
Drachhausen (Germany)
10x50 zwei gleich helle Sterne in Südost-Nordwest-Ausrichtung - Trennung eindeutig, aber sehr knapp
Robert Zebahl
Leipzig (Germany)
16x70 2020-08-19: Well separated with a clear, but not too wide separation. Slightly different in color, with the southern component appearing slightly cooler. Beautiful surrounding field.
Robert Zebahl
Leipzig (Germany)
16x70 2021-09-02: Quite conspicuous as a double star, moderately bright with very little difference in brightness. Slightly orange & white-bluish.
Uwe Pilz
Leipzig (Germany)
16x70 ../projects/double-stars/uwe-pilz/sketches/200918stf2664.jpg
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x sehr weit getrennt - trotz der großen Trennung auffällig, da kaum weitere Sterne im unmittelbaren Umfeld stehen - Komponente B im NW ist nicht viel schwächer als A - zurück auf 20x ist der Abstand zwischen beiden Sternen immer noch sehr groß
Mark McCarthy
Fremont (California/USA)
152mm (285x) Wide, white, slight magnitude difference
★★★ BLL49, U Cyg 8m0 9m0 65.4'' 231° 2015 Cyg 20h19m41.66s +47°54'19.90"
Robert Zebahl
Leipzig (Germany)
16x70 2020-07-03: Easy split with very good color contrast: white and clear orange.
Robert Zebahl
Leipzig (Germany)
102mm (28x) 2019-08-22: While the primary component appears quite unspectacular in a white, the companion U Cygni is much more interesting. It is a carbon star whose brightness varies between 5m9 and 12m1 with a period of about 463 days. It appears in mostly intensely orange, and even deep red in the towards its minimum. Extremely rewarding! ../projects/double-stars/robert-zebahl/sketches/2019-08-22_u_cyg.jpg
STF2679 AB 7m9 9m7 24.7'' 77° 2019 Del 20h24m22.59s +19°34'30.00"
AC 7m9 11m6 38.6'' 150° 2017
Robert Zebahl
Leipzig (Germany)
16x70 AB: 2021-09-02: Easy to separate with still moderate separation and rather large difference in brightness. Located in a star rich field.
Uwe Pilz
Leipzig (Germany)
16x70 AB: Sichtung unsicher ../projects/double-stars/uwe-pilz/sketches/200918stf2679.jpg
René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 32x ist Komponente B im Osten von A relativ weit getrennt erkennbar - Komponente B ist sehr schwach und gut 1.5 Magnituden schwächer als A - zurück auf 20x ist B nur noch ganz knapp erkennbar, aber weiterhin mit ordentlichem Abstand zu A
★★ 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
René 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)
STF2691 8m1 8m4 16.3'' 32° 2019 Cyg 20h29m43.18s +38°07'31.50"
Robert Zebahl
Leipzig (Germany)
16x70 2020-08-19: Nicely separated and in one field of view together with 40 Cygni and Messier 29. Moderate distance and brightness difference, relatively conspicuous even though the environment is rather rich in stars.
René Merting
Drachhausen (Germany)
18x70 das Paar ist genau richtig für 18-fache Vergrößerung - ein schön isoliert stehendes, knapp getrenntes Sterndoppel zweier gleichheller Protagonisten - Komponente B im NO ist nur unwesentlich schwächer
Robert Zebahl
Leipzig (Germany)
70mm (22x) 2020-07-29: At 22x clearly separated with little difference in brightness. Colorwise the components appeared different: yellowish-orange & bluish. The color impression was a bit more intensive at 44x: slightly orange & bluish.
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x ein schönes knapp getrenntes Pärchen aus zwei schwächeren Sternen - Komponente A im Süden ist nur unwesentlich heller als B - bei 32x leichter Farbkontrast, weil A warm-weiß strahlt
Uwe Pilz
Leipzig (Germany)
105mm (53x) schon bei 22x auffallend ../projects/double-stars/uwe-pilz/sketches/190726stf2691.jpg
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.
Mark McCarthy
Fremont (California/USA)
508mm (533x) 1 Del. B seen within A's diffraction at 533x and apodising mask, <1", ~2 delta
STF2690 & HJ269 & DA1 STF2690 A-BC 7m1 7m4 17.8'' 255° 2019 Del 20h31m11.94s +11°15'33.70"
HJ269 AD 7m1 12m1 23.0'' 108° 2016
DA1 BC 7m9 8m0 0.3'' 184° 2016

../images/binary-star-orbits/DA1-BC-orbit.jpg

René Merting
Drachhausen (Germany)
10x50 STF2690 (A-BC): ein ganz enges Sternpaar mit zwei gleich hellen Sternen - ich würde beide als 8 mit tiefer Einschnürung bezeichnen, also kurz vor der Trennung
Robert Zebahl
Leipzig (Germany)
16x70 STF2690 (A-BC): 2020-08-19: Striking, moderately bright with nice separation of the similarly bright components in nice environment. The eastern component seemed slightly brighter and colorwise cooler.
Uwe Pilz
Leipzig (Germany)
16x70 STF2690 (A-BC) ../projects/double-stars/uwe-pilz/sketches/200918stf2690.jpg
René Merting
Drachhausen (Germany)
100mm (20x) STF2690 (A-BC): bei 32x ein schön getrenntes Sternpaar mit leichtem Farbkontrast - Komponente A im Osten ist weiß, BC im Westen ist leicht gelblich und dumpfer, aber kaum ein Helligkeitsunterschied zwischen beiden Sternen - zurück auf 20x ist das Paar noch schöner anzusehen, weil beide Sterne dichter zusammen stehen
Mark McCarthy
Fremont (California/USA)
317mm (277x) STF2690 (A-BC): Widely separated near equal white stars.
Mark McCarthy
Fremont (California/USA)
508mm (533x) DA1 (BC): This is part of STF 2690 A-BC, which is a white, wide, near equal, pair (7.12/7.39 17.7") observed with 8-inch at 205x. I suspected BC at 8-inch 333x, & had overlapping disks with 8-inch 533x. With 20-inch 533x I see a hairline split, slight magnitude difference. Seeing is not supporting it well, but it's clear. Very nice. Dawes discovered in 1840 at 0.7" -- probably with his 8-inch Cooke refractor -- so at current 0.369" it's not surprising I only had overlapping disks at 8-inch. It's a physical pair, with a 236.52 year period, and will widen another 0.1" in the next 15 years
★★ STF2703 AB 8m3 8m4 25.1'' 290° 2019 Del 20h36m49.41s +14°43'42.40"
AC 8m3 8m8 77.8'' 234° 2016
AD 8m3 12m8 84.7'' 347° 2016
BC 8m4 8m8 67.0'' 215° 2016
Robert Zebahl
Leipzig (Germany)
16x70 2020-08-19: Immediately eye-catching multiple star located between beta and zeta Delphini. Components A, B & C are very easily seen as a triple system forming a striking triangle. A very slight difference in brightness between A & B is perceptible, as well as a color difference, though I cannot name any colors. Very nice.
Uwe Pilz
Leipzig (Germany)
16x70 AB ../projects/double-stars/uwe-pilz/sketches/200918stf2703.jpg
René Merting
Drachhausen (Germany)
100mm (20x) AB: bei 20x einfach - Komponente B im Westen ist nur minimal schwächer
BC: bei 20x ist Komponente C südwestlich von B in mehr als dem doppeltem Abstand von A zu B erkennbar, Helligkeitsunterschied gut eine halbe Größenklasse
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB ../projects/double-stars/uwe-pilz/sketches/200804stf2703.jpg
STT410 AB 6m7 6m8 0.9'' 2018 Cyg 20h39m33.31s +40°34'46.80"
AB-C 6m8 8m7 68.6'' 70° 2018
AB-D 6m8 10m0 106.6'' 327° 2018

../images/binary-star-orbits/STT410-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (198x) AB: nur mäßig schwierig, Abstand 0“87
Uwe Pilz
Leipzig (Germany)
105mm (288x) AB: nicht getrennt ../projects/double-stars/uwe-pilz/sketches/stt410.jpg
Robert Zebahl
Leipzig (Germany)
152mm (270x) All four components easily visible. The pair AB shows two clear, equally bright, overlapping diffraction disks. ../projects/double-stars/robert-zebahl/sketches/2019-09-06_stt410.jpg
Frederik Wanink
Itterbeck (Germany)
254mm (640x) AB: gleich hell, getrennt ../projects/double-stars/frederik-wanink/sketches/STT410.jpg
★★ STF2725 AB 7m5 8m2 6.1'' 12° 2018 Del 20h46m13.31s +15°54'26.40"

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

Robert Zebahl
Leipzig (Germany)
16x70 2021-09-02: The double star appears clearly elongated at the correct position angle, but nothing more.
René 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
Sarah Gebauer
Germany
100mm (45x) das Doppel lässt sich bei 45x sauber trennen und bildet mit Gamma2 Delphini ein optisches Doppel-Doppel, da beide Doppelsterne sehr gut in ein Gesichtsfeld passen ../projects/double-stars/sarah-gebauer/sketches/Gamma%20Del%20STF2725.jpg
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)
203mm (205x) OR Del. Light yellow stars, half delta mag, wide. Physical pair with a 2945.18 year period. In same field with bright pair STF 2727
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)
8x42 On tripod. Definite elongation, and eastern end of elongation (i.e. component A) is definitely brighter than the other end. PA estimated at 240° without prior knowledge.
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.
Robert Zebahl
Leipzig (Germany)
16x70 2021-09-02: Beautiful sight in very nice surrounding. Easy to split, but quite small separation. A rather small difference in brightness is clearly visible. The primary component appears golden in color.
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.
Christopher Hay
Seeheim (Germany)
40x80 Widely split, visually strong, dominating the field of view. Component A appears yellowish compared to component B. Struve 2725 in same FOV finely split.
René 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 STF2725 gut 15' südlich sehenswert
Sarah Gebauer
Germany
100mm (45x) bei 45x sauber getrennt und zusammen mit dem DS STF 2725 in einem Gesichtsfeld, dadurch wirken sie wie ein optisches Doppel-Doppel, sehr schön! Beide DS bilden auch einen auffälligen Lichthof ../projects/double-stars/sarah-gebauer/sketches/Gamma%20Del%20STF2725.jpg
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)
152mm (285x) Gam 2 Del. ! Most beautiful light orange-yellow A and ~1 delta mag blue-green B
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) Observation with an achromat. The fainter component was visible as a permanent brightening of the first diffraction ring.
Robert Zebahl
Leipzig (Germany)
152mm (300x) 2020-08-24: Observation with an ED refractor. At 171x partially, at 200x clearly visible as '8'. At 300x two clear, overlapping diffraction disks of differently bright components.
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.
BU65, 13 Del 5m6 8m2 1.5'' 199° 2009 Del 20h47m48.33s +06°00'29.50"
Uwe Pilz
Leipzig (Germany)
105mm (288x) ../projects/double-stars/uwe-pilz/sketches/190823_13del.jpg
Mark McCarthy
Fremont (California/USA)
203mm (533x) 13 Del. Suspected at 333x, went up to 533x. The B star seems much fainter about 3 delta mag, and seen only when seeing is still as a blue point just outside first diffraction. ~1.5"
BU155 AB 7m4 8m1 0.7'' 41° 2018 Cyg 20h51m05.41s +51°25'01.70"

../images/binary-star-orbits/BU155-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/BU155.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Clean split, nice disks, 1 delta mag, ~1". Pale yellow and pale easter egg blue.
STT417 AB 8m2 8m4 0.9'' 28° 2018 Vul 20h53m04.23s +29°08'43.70"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) einfach ../projects/double-stars/frederik-wanink/sketches/STT417.jpg
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/STT%20417%20AB.jpg
STT418 8m2 8m3 0.9'' 284° 2018 Cyg 20h54m49.84s +32°42'23.20"

../images/binary-star-orbits/STT418-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt, gleich hell ../projects/double-stars/frederik-wanink/sketches/STT418.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Near equal 1" split, white.
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/STT%20418.jpg
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
STF2746 7m9 8m7 1.2'' 323° 2018 Cyg 21h01m50.05s +39°15'38.40"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwierig, schwach, Helligkeitsunterschied, blickweise getrennt ../projects/double-stars/frederik-wanink/sketches/STF2746.jpg
★★★ 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.
René 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)
317mm (553x) equal light orange, well split, pretty
STF2744 AB 6m8 7m3 1.2'' 108° 2019 Aqr 21h03m03.09s +01°31'55.90"

../images/binary-star-orbits/STF2744-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF2744.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) Split, ~1.5", near equal yellow-orange stars
STF2745, 12 Aqr AB 5m8 7m5 2.5'' 197° 2017 Aqr 21h04m04.71s -05°49'23.00"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF2745.jpg
STF2757 7m8 9m2 1.9'' 264° 2016 Cyg 21h04m34.72s +52°23'59.20"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) sehr schwierig, Begleiter ganz schwach zu erkennen ../projects/double-stars/frederik-wanink/sketches/STF2757.jpg
Mark McCarthy
Fremont (California/USA)
508mm (205x) Very attractive white A and light yellow B, ~2", ~2 delta mag
★★★ STF2758, 61 Cyg AB 5m2 6m0 31.8'' 153° 2019 Cyg 21h06m53.95s +38°44'57.90"

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

Christopher Hay
Seeheim (Germany)
8x42 On tripod. Clearly split, northern component A substantially brighter than B. Both orange, whereby A is distinctly more yellowish than B (sky quality similar to that of earlier 15x45 and 10x42 observations). Also seems to be split using the 8x42 handheld, but hand tremor makes this uncertain.
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.
Robert Zebahl
Leipzig (Germany)
16x70 2021-06-14: Beautiful sight. Bright orange & orange.
René 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
Jörg S. Schlimmer
Germany
127mm (203x) Intensive Farbe ../projects/double-stars/joerg-schlimmer/sketches/Zeichnung_61_Cyg_filtered_96dpi.jpg
Robert Zebahl
Leipzig (Germany)
152mm (22x) 2020-06-24: Beautifully separated, bright, striking, especially the colors: bright orange and orange.
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]
Uwe Pilz
Leipzig (Germany)
320mm (121x) Der Doppelstern bildet 2021 mit dem 11-mag-Stern ein fast gleichschenkliges Dreieck ../projects/double-stars/uwe-pilz/sketches/211001_61Cyg.jpg
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/61%20Cygni.png
STF2762, V389 Cyg AB 5m7 8m1 3.4'' 303° 2015 Cyg 21h08m38.87s +30°12'20.50"
AC 5m7 10m2 59.3'' 229° 2007
AD 5m7 11m4 73.1'' 66° 2002
René Merting
Drachhausen (Germany)
76mm (57x) AB: bei 57x ist die B-Komponente knapp abgesetzt nordwestlich von A erkennbar - B ist 2 Größenklassen schwächer
AC: bei 57x ist C südwestlich des Sternpaares AB auszumachen, deutlich größerer Abstand, schätzungsweise 2/3 des Abstandes AD
AD: D im NW ist ebenfalls zu erkennen und steht am weitesten entfernt
René Merting
Drachhausen (Germany)
100mm (64x) AB: bei 64x kann ich nordwestlich von A den schwachen Begleiter knapp getrennt ausmachen - bei 107x dann ist die Trennung eindeutig - großer Helligkeitsunterschied zwischen 2.5 und 3 Größenklassen
Uwe Pilz
Leipzig (Germany)
105mm (200x) AB: Gelb-weiß ../projects/double-stars/uwe-pilz/sketches/191119STF2762.jpg
Mark McCarthy
Fremont (California/USA)
203mm (121x) AB: V389 Cyg. A is white, quite bloated in this poor seeing night, can see three delta mag tan color B, very close split, need seeing to settle
Mark McCarthy
Fremont (California/USA)
317mm (277x) AC: Bright white and fainter blue B, very wide separation.
STF2765 AB 8m5 8m5 2.9'' 82° 2018 Equ 21h10m59.31s +09°32'57.90"
AC 8m5 14m2 44.2'' 167° 2015
Robert Zebahl
Leipzig (Germany)
70mm (80x) AB: At 44x pretty faint, clearly elongated, notched. At 57x almost separated. At 80x and 100x clearly separated, rather tight, matched.
René Merting
Drachhausen (Germany)
100mm (107x) AB: bei 64x kleben beide Sterne aneinander, eine eindeutige Einschnürung ist erkennbar - sicher wird die Trennung bei 107x - beide Sterne sind gleich hell und weiß, Komponente B vermute ich östlich - richtig geraten, denn beide haben nur 0.03 mag Helligkeitsunterschied
Uwe Pilz
Leipzig (Germany)
105mm (144x) AB: Weißgelb-Gelb ../projects/double-stars/uwe-pilz/sketches/190930STF2765.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Faint, matched, slightly red tinted stars
STF2780 AB 6m1 6m8 1.0'' 212° 2019 Cep 21h11m48.24s +59°59'11.80"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) einfach, sternenreiche Umgebung ../projects/double-stars/frederik-wanink/sketches/STF2780.jpg
H1 48 7m2 7m3 0.7'' 245° 2019 Cep 21h13m42.46s +64°24'15.10"

../images/binary-star-orbits/H1-48-orbit.jpg

Robert Zebahl
Leipzig (Germany)
152mm (270x) Clearly elongated, of equal brightness with partly visible, slight notching.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/SAO19257.jpg
STF2783 7m7 8m1 0.7'' 349° 2019 Cep 21h14m04.90s +58°17'49.80"

../images/binary-star-orbits/STF2783-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) nicht leicht trennbar wegen Luftunruhe ../projects/double-stars/frederik-wanink/sketches/STF2783.jpg
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.
René 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
★★ STF2789 AB 7m7 7m9 6.9'' 114° 2019 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
René Merting
Drachhausen (Germany)
100mm (32x) bei 32x zwei gleichhelle ganz dicht beieinander stehende weiße Lichtpünktchen, ganz knapp getrennt - wunderschön mit dieser Teleskopöffnung
STT437 AB 7m2 7m4 2.4'' 19° 2018 Cyg 21h20m50.12s +32°27'10.20"

../images/binary-star-orbits/STT437-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
63mm (93x) 2021-08-15: At 65x almost separated. The diffraction disks were still slightly touching each other. At 93x very clean separation with little difference in brightness.
Robert Zebahl
Leipzig (Germany)
70mm (57x) At 57x separated, but close together. Near, slightly brighter star in nice contrast. The double star shows a distinct orange coloration. At 100x small difference in brightness visible.
René Merting
Drachhausen (Germany)
76mm (95x) bei 95x zeigt sich ein enges äußerst knapp getrenntes Sterndoppel - die B-Komponente im Norden ist maximal eine Viertel Größenklasse schwächer
René Merting
Drachhausen (Germany)
100mm (107x) bei 64x eine schöne 8, die beiden etwa gleich hellen Sterne berühren sich noch ganz leicht und scheinen fast getrennt zu sein - bei 107x ist die Trennung dann knapp, aber deutlich
Uwe Pilz
Leipzig (Germany)
105mm (200x) orange und orangegelb, schön auch bei 88x ../projects/double-stars/uwe-pilz/sketches/191119STT437.jpg
Frederik Wanink
Itterbeck (Germany)
254mm (640x) einfach ../projects/double-stars/frederik-wanink/sketches/STT437.jpg
STFB11 & TOK9001, 1 Peg STFB11 AB 4m2 9m3 36.3'' 312° 2019 Peg 21h22m05.13s +19°48'15.70"
STFB11 AC 4m2 12m9 64.3'' 13° 2017
TOK9001 AD 4m2 9m6 5.3'' 151° 1993

../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

René Merting
Drachhausen (Germany)
76mm (29x) STFB11 (AB): bei 29x zeigt sich die B Komponente deutlich abgesetzt nordwestlich von A und ist viel schwächer - Komponente A ist gelblich, B eher grau
Uwe Pilz
Leipzig (Germany)
105mm (88x) STFB11 (AB): der helle Stern ist weiß. ../projects/double-stars/uwe-pilz/sketches/191014_1Peg.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) STFB11 (AB): 1 Peg: Easy yellow-orange & wide separated B
STF2793 AB-C 7m4 9m0 26.4'' 241° 2014 Equ 21h25m05.66s +09°23'02.60"
Robert Zebahl
Leipzig (Germany)
70mm (22x) At 22x easily separable with relatively large angular distance. C component much fainter. At 44x AB appeared white-yellowish, C somewhat reddish.
René Merting
Drachhausen (Germany)
100mm (20x) bei 20x einfach zu trennen - Komponente AB im Osten weiß, Komponente C im Westen ist gut 1.5 Größenklassen schwächer und strahlt kupferbraun - auf 20x zurück kann man den Doppelstern ebenfalls noch gut trennen, B ist dann allerdings schon sehr schwach
Uwe Pilz
Leipzig (Germany)
105mm (144x) ../projects/double-stars/uwe-pilz/sketches/190930STF2793.jpg
STF2797, KP Peg 7m4 8m8 3.5'' 217° 2011 Peg 21h26m41.14s +13°41'17.80"
Robert Zebahl
Leipzig (Germany)
70mm (57x) Split at 57x, but very tight with clear difference in brightness. At 100x well split. The faint B component was slightly outside the first diffraction ring of the primary component.
Uwe Pilz
Leipzig (Germany)
105mm (144x) ../projects/double-stars/uwe-pilz/sketches/191014_STF2797.jpg
Mark McCarthy
Fremont (California/USA)
203mm (533x) KP Peg. Light yellow A and ~4", 1.5 delta mag orange B
Berthold Fuchs
Wiesbaden (Germany)
130mm v.close DS ../projects/double-stars/berthold-fuchs/photographs/STF2797.png
STF2806, 8 Cep, beta Cep, Alfirk AB 3m2 8m6 13.5'' 251° 2016 Cep 21h28m39.58s +70°33'38.50"
Sarah Gebauer
Germany
100mm (45x) bei 45x haarscharf getrennt, die zweite Komponente fällt erst auf den zweiten Blick auf, da sie viel schwächer und kleiner ist und beinahe vom Lichtschein der Hauptkomponente überstrahlt wird ../projects/double-stars/sarah-gebauer/sketches/Beta%20Cep.jpg
Frederik Wanink
Itterbeck (Germany)
254mm ../projects/double-stars/frederik-wanink/photographs/Alfirk.jpg
STF2799 AB 7m4 7m4 2.1'' 262° 2018 Peg 21h28m52.79s +11°05'05.20"

../images/binary-star-orbits/STF2799-AB-orbit.jpg

Robert Zebahl
Leipzig (Germany)
70mm (100x) At 100x, barely, at 128x clearly split with equally bright components.
Uwe Pilz
Leipzig (Germany)
105mm (200x) beide Komponenten gelb ../projects/double-stars/uwe-pilz/sketches/191014_STF2799.jpg
Mark McCarthy
Fremont (California/USA)
203mm (533x) Very nice pair, only slightly unequal, ~3"
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.
LSL1, Lassell 1 AB 10m6 11m7 82.1'' 82° 2015 Cyg 21h34m45.16s +32°04'42.60"
AC 10m6 12m1 106.1'' 127° 2015
AD 10m6 11m9 21.2'' 134° 2015
AE 10m6 13m5 10.5'' 331° 2015
BF 11m7 12m1 18.4'' 210° 2015
CG 12m1 14m4 11.5'' 199° 2015
Uwe Pilz
Leipzig (Germany)
105mm (200x) das südliche Paar konnte nur indirekt erkannt werden und blieb schwierig ../projects/double-stars/uwe-pilz/sketches/191119Lasell1.jpg
Robert Zebahl
Leipzig (Germany)
152mm (180x) Comparatively wide pairs with rather faint components. Observation at nearly full moon. Components A & D easy, B relatively well and C & F quite faint. Components E & G not visible. Overall unspectacular under these conditions.
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
STT447 & BU449 & FOX262 & ABH148 BU449 AB 7m7 12m6 6.0'' 14° 2015 Cyg 21h39m28.71s +41°43'36.00"
STT447 AC 7m7 11m2 14.0'' 176° 2017
BU449 AD 7m7 13m1 18.9'' 248° 2015
STT447 AE 7m7 8m5 29.1'' 43° 2019
ABH148 AG 7m7 14m6 33.8'' 337° 2015
ABH148 AH 7m7 13m8 74.4'' 263° 2015
ABH148 AI 7m7 11m7 92.9'' 271° 2015
ABH148 AJ 7m7 13m8 71.2'' 95° 2015
ABH148 AK 7m7 15m6 74.7'' 49° 2015
FOX262 EF 8m5 11m6 41.7'' 46° 2015
Uwe Pilz
Leipzig (Germany)
120mm (150x) Komponente J war schwierig. ../projects/double-stars/uwe-pilz/sketches/210815_bu449.jpg
René Merting
Drachhausen (Germany)
320mm (45x) FOX262 (EF): bei 45x ist nordwestlich des Doppelsterns STT447 (AE) in noch einmal der gleichen Entfernung und wie an einer Perlenkette gezogen ganz schwach Komponente F zu erkennen - schöne Helligkeitsabstufung zwischen diesen drei Sternen
René Merting
Drachhausen (Germany)
320mm (45x) AC: bei 45x ist Komponente C sehr schwach südlich von A zu erkennen, Helligkeitsunterschied mindestens 3-4 Größenklassen
AE: bei 45x sind A und E zwar schon weit getrennt, aber trotzdem ein Mehrfachsystem - Komponente A strahlt leicht gelblich, die Farbe von der gut eine Magnitude schwächeren Komponente E im NO geht in Richtung rostig-grau
nachrichtlich: wenn man genau hin schaut, sieht man weiter im NO von E noch einen weiteren gut 2 Größenklassen schwächeren Stern, das ist Komponente F (separate Bezeichnung Fox262)
75 Cyg AC20 AB 5m3 10m1 2.7'' 327° 2008 Cyg 21h40m11.11s +43°16'25.80"
STTA221 AC 5m3 10m3 62.2'' 253° 2003
Uwe Pilz
Leipzig (Germany)
105mm (137x) recht weit, einfach ../projects/double-stars/uwe-pilz/sketches/75Cyg.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) gelb
Mark McCarthy
Fremont (California/USA)
203mm (205x) AC20 (AB): 75 Cyg. I detect a brightening knot on the outside of A's diffraction. Seeing does not resolve it to a point. Both stars are orange. Alvin Clark discovered in 1860 at 2.9" -- don't know what aperture
BU688 AB 8m1 8m6 0.5'' 198° 2016 Cyg 21h42m33.41s +41°02'51.00"

../images/binary-star-orbits/BU688-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) länglich, unsicher ../projects/double-stars/frederik-wanink/sketches/BU688.jpg
mu Cyg, 78 Cyg, STF2822 AB 4m8 6m2 1.6'' 322° 2019 Cyg 21h44m08.57s +28°44'33.40"
AD 4m8 6m9 197.0'' 43° 2019

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

Uwe Pilz
Leipzig (Germany)
60mm (198x) AB: Aufhellung innerhalb des ersten Rings
Robert Zebahl
Leipzig (Germany)
70mm (128x) AB: At 128x I was able to see this double at least elongated.
Sarah Gebauer
Germany
150mm (160x) AD: bei der Sichtung noch eher unsicher, welche der hellen Sterne die Komponenten AB enthalten, denn diese habe ich nicht getrennt, AD mit einem Abstand von 196'' stehen mit drei weiteren Feldsternen in einer mehr oder minder interessanten Konstellation ../projects/double-stars/sarah-gebauer/sketches/20200731%20Mu%20Cyg%20DSk.jpg
Robert Zebahl
Leipzig (Germany)
200mm (171x) AB: Quite well split with noticeable fainter component.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) AB: getrennt ../projects/double-stars/frederik-wanink/sketches/STF2822.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) AB: Yellow and light orange pair, ~1", 1 delta mag. Very pretty, subtle colors
STF2843 AB 7m0 7m3 1.4'' 150° 2016 Cep 21h51m37.25s +65°45'09.90"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) gleich hell, einfach ../projects/double-stars/frederik-wanink/sketches/STF2843.jpg
★★ 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
STT457 6m0 8m2 1.4'' 246° 2016 Cep 21h55m30.99s +65°19'14.90"
Uwe Pilz
Leipzig (Germany)
105mm (200x) Beule in der Beugungsscheibe, nicht einfach ../projects/double-stars/uwe-pilz/sketches/stt457_2.jpg
Uwe Pilz
Leipzig (Germany)
105mm (288x) Begleiter berührt den Beugungsring
Uwe Pilz
Leipzig (Germany)
105mm (360x) „Zipfel“ am ersten Ring, nicht einfach ../projects/double-stars/uwe-pilz/sketches/stt457_1.jpg
STT458 AB 7m2 8m4 1.0'' 348° 2016 Cep 21h56m27.30s +59°47'42.40"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) ../projects/double-stars/frederik-wanink/sketches/STT458.jpg
BU694, V1942 Cyg AB 5m7 7m8 1.0'' 2016 Cyg 22h02m56.68s +44°38'59.80"
Mark McCarthy
Fremont (California/USA)
203mm (333x) V1942 Cyg. Split with seeing, very much fainter B at the rim of A's diffraction, blue-white stars. Burnham discovered in 1878 at 0.5" with the Dearborn 18.5-inch
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"
STF2872 A-BC 7m1 8m0 22.8'' 315° 2019 Cep 22h08m36.04s +59°17'22.20"
AD 7m1 11m8 117.3'' 153° 2014
BC 8m0 8m0 0.8'' 297° 2018

../images/binary-star-orbits/STF2872-BC-orbit.jpg

René Merting
Drachhausen (Germany)
100mm (20x) A-BC: bei 32x einfach zu trennen, die B-Komponente im NW ist nur knapp schwächer - dezenter Farbunterschied, A leuchtet weiß-bläulich und BC weiß-gelblich - zurück auf 20x zeigt sich der Doppelstern weiter gut getrennt
Frederik Wanink
Itterbeck (Germany)
254mm (640x) BC: BC in ruhigen Momenten trennbar ../projects/double-stars/frederik-wanink/sketches/STF2872.jpg
STF2879 AB 8m0 8m3 0.7'' 233° 2018 Cep 22h10m59.56s +63°23'58.50"
Mark McCarthy
Fremont (California/USA)
203mm (205x) V447 Cep ! Excellent pair, seen at small scale at this magnification. Nice clean split, half delta mag, really pretty. A is variable 7.26 - 7.62 V over a period of 7.52655 days, but there is a lack of recent observations on AAVSO. If it were near maximum it might be more difficult to resolve the split at small aperture. I also pick up a very faint white star the averted vision, widely separated -- this is AC, 7.99/11.91 29.2. FYM 192 AD, mag 12.98, not seen
Frederik Wanink
Itterbeck (Germany)
254mm (640x) ähnlich hell, gut trennbar ../projects/double-stars/frederik-wanink/sketches/STF2879.jpg
★★ STF2893 6m2 7m9 28.9'' 348° 2018 Cep 22h12m52.76s +73°18'25.90"
Sarah Gebauer
Germany
100mm (45x) ein deutlicher und sehr schöner Farbkontrast der beiden ähnlich hellen Komponenten, gelblich-orange und bläulich trifft es sehr gut, die Farben sind recht stark und der DS erinnert an einen Mini-Albireo ../projects/double-stars/sarah-gebauer/sketches/STF%202893.jpg
HO180 AB 7m9 8m7 0.8'' 242° 2017 Lac 22h15m48.59s +43°54'02.60"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwieriger zu trennen ../projects/double-stars/frederik-wanink/sketches/HO180.jpg
KR60, DO Cep, Kruger 60 AB 9m9 11m4 1.5'' 266° 2016 Cep 22h27m59.20s +57°41'43.80"

A detailed article about Kruger 60 was published in the "Journal of Double Star Observations" by Wilfried R.A. Knapp and John Nanson. Another article is about the origin of the comet 2I/Borisov (C/2019 Q4) in connection with Kruger 60.

../images/binary-star-orbits/KR60-AB-orbit.jpg

Uwe Pilz
Leipzig (Germany)
105mm (288x) Unsicher – nur des Positionswinkel wurde zwar blickweise erkannt, aber die Komponenten verwechselt.
Robert Zebahl
Leipzig (Germany)
152mm (150x) Observed at magnifications between 129x and 300x. The seeing and transparency (Bortle 6-) were only average. The rather faint B component seemed to appear in few moments.
Robert Zebahl
Leipzig (Germany)
152mm (150x) The seeing was more average (3/5). Observation under suburban conditions (Bortle 6, SQM-L 19.1). Initially observed at 270x, later at 300x. The extremely faint companion was always visible at the same position if the air was steady enough. Difficult because of the low magnitude!
Uwe Pilz
Leipzig (Germany)
320mm (387x) äußerst schwierig, nur blickweise sichtbar ../projects/double-stars/uwe-pilz/sketches/191002_Krueger60.jpg
Mark McCarthy
Fremont (California/USA)
508mm (205x) DO Cep. Easy pair, reddish B, lots of stars around including a near equal double to the WNW separated about 5". KR 60 will make a quarter turn in its orbit by 2035
★★ STF2909, zet 2 Aqr AB 4m3 4m5 2.3'' 160° 2019 Aqr 22h28m49.81s -00°01'12.20"

../images/binary-star-orbits/STF2909-AB-orbit.jpg

Christopher Hay
Seeheim (Germany)
180mm (120x) Neatly split, whereby the first difraction rings of each component touch the Airy discs of the other. Component A in the north seems marginally more yellowish than component B in the south.
Zeta Aqr is called Sadaltager, meaning „Merchant’s Luck“. It is framed nicely by Pi, Gamma and Eta Aquarii, with which it forms a striking triangular asterism known as „The Tent“. Moreover, Zeta Aqr is a true physical double. This constellation and the beautiful telescopic appearance warrant a two-star rating.
Frederik Wanink
Itterbeck (Germany)
254mm (240x) einfach ../projects/double-stars/frederik-wanink/sketches/STF2909.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Very bright white, equal magnitude, fairly close ~2".
★★ delta Cep, 27 Cep BU702 AB 4m2 13m0 21.5'' 282° 2015 Cep 22h29m10.25s +58°24'54.70"
STFA58 AC 4m2 6m1 41.0'' 191° 2018
DAL45 AD 4m2 13m9 109.0'' 39° 2015
DAL45 DE 13m9 14m0 1.4'' 23° 2008
Christopher Hay
Seeheim (Germany)
7x45 AC: Hand tremor hampers splitting A and C at this low magnification, as the apparent separation is small. Nonetheless, a grey-blue C dances next to the luminous-orange A.
Component A is the prototype of the Cepheid class of variable stars, with a brightness variation of a full magnitude over 5 days. To assess a somewhat difficult handheld binocular split like this it would really be necessary to know the momentary brightness of A, but I didn’t have a telescope at hand.
Robert Zebahl
Leipzig (Germany)
16x70 AC: 2020-09-20: Nice separation with noticeable difference in brightness. Slightly yellowish & white-bluish.
Robert Zebahl
Leipzig (Germany)
55mm (27x) AC: 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, C appears rather grey-bluish.
Robert Zebahl
Leipzig (Germany)
80mm (25x) AC: Obvious difference in brightness and color. Brighter component slightly orange, weaker bluish. Could be Albireo's little brother ;)
Sarah Gebauer
Germany
150mm (85x) AC: die hellere Komponente ist sehr intensiv und richtig schön goldgelb und die zweite, deutlich schwächere Komponente hat einen sichtbar bläulichen Farbstich, insgesamt schon ab 21x sehr schön anzuschauen ../projects/double-stars/sarah-gebauer/sketches/Delta%20Cep.jpg
Mark McCarthy
Fremont (California/USA)
508mm (667x) DE: Slight brightening in the diffraction ring
Frederik Wanink
Itterbeck (Germany)
254mm AC ../projects/double-stars/frederik-wanink/photographs/Delta%20Cephei.jpg
STF2934 8m6 9m6 1.4'' 57° 2016 Peg 22h41m51.68s +21°25'53.00"

../images/binary-star-orbits/STF2934-orbit-solution-1.jpg ../images/binary-star-orbits/STF2934-orbit-solution-2.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwieriger wegen schwacher Sterne ../projects/double-stars/frederik-wanink/sketches/STF2934.jpg
Mark McCarthy
Fremont (California/USA)
508mm (533x) 1.5 delta mag, well split, ~1.5", bluish white stars
STF2935 AB 6m8 7m9 2.4'' 307° 2016 Aqr 22h43m03.40s -08°18'41.20"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) getrennt ../projects/double-stars/frederik-wanink/sketches/STF2935.jpg
STT476 A-BC 7m4 7m1 0.5'' 304° 2018 Lac 22h43m04.32s +47°10'07.50"
Frederik Wanink
Itterbeck (Germany)
254mm (640x) länglich ../projects/double-stars/frederik-wanink/sketches/STT476.jpg
BU382 AB 6m0 7m8 0.7'' 244° 2016 Lac 22h53m40.16s +44°44'57.10"

../images/binary-star-orbits/BU382-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) schwierig, Helligkeitsunterschied stark ../projects/double-stars/frederik-wanink/sketches/BU382.jpg
COU240 7m7 8m8 0.8'' 289° 2017 Peg 22h56m23.71s +22°57'21.20"
Robert Zebahl
Leipzig (Germany)
152mm (300x) Borderline observation with rather less good seeing. The fainter companion could be detected in the correct position angle to some extent as a small bulge in the diffraction disk.
Frederik Wanink
Itterbeck (Germany)
254mm (640x) in ruhigen Momenten getrennt ../projects/double-stars/frederik-wanink/sketches/COU240.jpg
Mark McCarthy
Fremont (California/USA)
508mm (533x) Hairline split with 333x, wider with 533x, split with seeing and apodising mask to clean up A's bright white significant delta mag
STF2982, 57 Peg AB 5m3 10m1 32.6'' 198° 2015 Peg 23h09m31.45s +08°40'37.80"
Uwe Pilz
Leipzig (Germany)
105mm (88x) gelb ../projects/double-stars/uwe-pilz/sketches/201220_57Peg.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) A a pretty, bright orange, B widely separated to south, bluish B ~3 delta mag.
STF2986 6m6 8m9 31.4'' 270° 2018 Peg 23h09m57.10s +14°25'35.60"
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x ist Komponente B weit getrennt westlich von A zu erkennen - B ist sehr schwach (kommt mir schwächer vor als 8.88 mag laut Stelle Doppie), Helligkeitsunterschied gut 3 Größenklassen (2,27 mag laut Stelle Doppie) - zurück auf 20x ist B noch immer gerade so erkennbar - beide sind allerdings nur noch als Doppelstern mit dem Wissen darüber erkennbar
Uwe Pilz
Leipzig (Germany)
105mm (200x) orange ../projects/double-stars/uwe-pilz/sketches/201220stf2986.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) Red A, bluish B, wide separation ~2 delta magnitude
René Merting
Drachhausen (Germany)
320mm (45x) bei 45x zeigt sich B bereits weit abgesetzt im Westen von A - Komponente A ist weißgelblich, B dagegen ist 1.5 bis 2 Größenklassen schwächer und strahlt braun-grau
Berthold Fuchs
Wiesbaden (Germany)
130mm easy DS ../projects/double-stars/berthold-fuchs/photographs/STF2986.png
BU385 AB 7m4 8m2 0.7'' 84° 2018 Peg 23h10m17.15s +32°29'13.40"

../images/binary-star-orbits/BU385-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) in ruhigen Momenten getrennt ../projects/double-stars/frederik-wanink/sketches/BU385.jpg
STF2991 6m0 10m2 32.5'' 358° 2012 Peg 23h13m26.50s +11°03'54.00"
Uwe Pilz
Leipzig (Germany)
105mm (200x) orange ../projects/double-stars/uwe-pilz/sketches/201220stf2991.jpg
Mark McCarthy
Fremont (California/USA)
317mm (277x) A a pretty, bright orange, B bluish and widely separated to north.
René Merting
Drachhausen (Germany)
320mm (45x) bei 45x ein wunderschöner Doppelstern, weil die A-Komponente buttergelb strahlt - B zeigt sich schön abgesetzt nördlich von A, sie ist so schwach, dass ihr alle Farbe entwichen scheint - mitunter stellt sich aber auch ein rostbrauner Farbeindruck für B ein
STF3003 9m8 9m8 21.9'' 266° 2015 Cep 23h15m07.06s +83°26'48.80"
Uwe Pilz
Leipzig (Germany)
105mm (240x) Der schwache Begleiter erfordert eine recht hohe Vergrößerung, um sich "herauszuschälen" ../projects/double-stars/uwe-pilz/sketches/201117stf3003.jpg
★★ STF3012 & STF 3013 & DOB18 STF3012 AB 9m5 9m8 2.9'' 190° 2016 Peg 23h27m33.16s +16°37'22.90"
STF3012 AC 9m5 8m5 53.4'' 67° 2018
DOB18 AD 9m5 10m2 49.7'' 64° 2015
DOB18 BD 9m8 10m2 51.4'' 62° 2015
STF3013 BC 9m8 8m5 54.1'' 64° 2015
STF3013 CD 8m5 10m2 3.2'' 277° 2017
Sarah Gebauer
Germany
100mm (136x) beginnend mit 21x ist das Doppel-Doppel gefunden, bei 45x ist zu erkennen, dass jeder Stern jeweils ein DS ist, doch bei 136x wird das Bild so dunkel, dass die Sterne kaum noch zu sehen, geschweige denn zu trennen sind
Uwe Pilz
Leipzig (Germany)
105mm (180x) STF3012: Es war schwierig zu erkennen, welcher Stern der hellere war. Die Trennung war insgesamt nicht einfach. Anfangs sah ich nur einen länglichen Stern.
STF3013: Anfangs sah ich nur einen länglichen Stern. Der große Helligkeitsunterschied macht die Trennung interessanterweise einfacher als STF3012.
../projects/double-stars/uwe-pilz/sketches/201117stf30123013.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) STF3012 (AB): near equal brightness ~3" separation. Double double with STF 3021
72 Peg, BU720 5m7 6m1 0.6'' 107° 2018 Peg 23h33m57.19s +31°19'31.00"

../images/binary-star-orbits/BU720-orbit.jpg

Uwe Pilz
Leipzig (Germany)
120mm (250x) gelb und orange ../projects/double-stars/uwe-pilz/sketches/201220_72peg.jpg
Frederik Wanink
Itterbeck (Germany)
254mm (640x) als 8 zu sehen ../projects/double-stars/frederik-wanink/sketches/72Peg.jpg
Mark McCarthy
Fremont (California/USA)
317mm (553x) 72 Peg. Small, hard, faint point very tight to A, but split. Stays with seeing.
STT507 AB 6m8 7m8 0.7'' 323° 2018 Cas 23h48m39.03s +64°52'35.30"

../images/binary-star-orbits/STT507-AB-orbit.jpg

Mark McCarthy
Fremont (California/USA)
203mm (333x) Snowman at 205x, hairline split with 333x, A is a soft white and B is light blue, ~1 delta mag. Physical with 565 year period
Frederik Wanink
Itterbeck (Germany)
254mm (640x) eindeutig zu trennen, 3er System ../projects/double-stars/frederik-wanink/sketches/STT507.jpg
STT510 AB 7m9 8m4 0.6'' 120° 2018 And 23h51m33.03s +42°04'57.70"

../images/binary-star-orbits/STT510-AB-orbit.jpg

Frederik Wanink
Itterbeck (Germany)
254mm (640x) 3er System, gerade getrennt zu sehen ../projects/double-stars/frederik-wanink/sketches/STT510.jpg
★★ STF3044 7m3 7m9 18.7'' 283° 2017 Peg 23h52m59.94s +11°55'27.40"
Robert Zebahl
Leipzig (Germany)
70mm (22x) At 22x easy to separate with small difference in brightness. A color difference was noticeable. One component looked white-bluish, the other slightly orange. However, the colors changed again and again between the components. Even at 44x the color impression remained the same.
René Merting
Drachhausen (Germany)
100mm (20x) bei 32x gut getrennt, Komponente B im Westen etwa eine viertel Magnitude schwächer - auch bei 20x noch sehr ansehnlich, beide Sterne stehen gut getrennt eng beieinander
Uwe Pilz
Leipzig (Germany)
105mm (88x) ../projects/double-stars/uwe-pilz/sketches/201220stf3044.jpg
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
René Merting
Drachhausen (Germany)
100mm (144x) AB: bei 144x sind beide Komponenten knapp getrennt erkennbar - Komponente B ist bestimmt 2 Magnituden schwächer - Komponente A wirkt kühler, obwohl kein echter Farbkontrast erkennbar ist
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'' 343° 2019 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.
René Merting
Drachhausen (Germany)
76mm (95x) bei 57x deutet sich an, dass es sich um einen Doppelstern handeln könnte - bei 95x zeigt sich dann ein extrem knapp getrenntes Pärchen - beide Sterne sind gleich hell
Sarah Gebauer
Germany
100mm (136x) ui, schön! Ein sehr enges Pärchen, bei 136x ganz knapp getrennt, zwei winzig kleine, gleich helle Äuglein nebeneinander
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"