Double Stars - Selection of Multiple Systems

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 8
Visual Observations 55
Sketches 19
Photographs 0
Observers 10
Sarah Gebauer, Christopher Hay, Karsten Kopp, Winfried Kräling, Stefan Loibl, Mark McCarthy, René Merting, Uwe Pilz, Frederik Wanink, Robert Zebahl
m1 m2 ρ θ Year Coordinates (J2000)
★★★ STF412, 7 Tau AB 6m6 6m9 0.8'' 351° 2019 Tau 03h34m26.62s +24°27'52.10"
AB-C 5m9 9m9 22.4'' 53° 2014

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

Uwe Pilz
Leipzig (Germany)
105mm (260x) AB: A-B länglich
Christopher Hay
Seeheim (Germany)
180mm (110x) No definite elongation of AB seen at 110x, seeing is poor. But nice pinprick of light wide off to NE, seems bluish, this is the C component.
AB-C is physical at 429 light years distance from us, and so is A-B, so this is a physical triple system. Very easy to find 3° due west of the Pleiades.
★★★ 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
★★★ 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.
★★ 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
★★★ 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.
ENG37 & SLE335 & SLE685, 39/40 Cnc ENG37 AB 6m5 6m6 151.8'' 150° 2015 Cnc 08h40m06.44s +20°00'28.10"
ENG37 AC 6m5 9m0 134.0'' 309° 2015
ENG37 AD 6m5 8m8 134.9'' 111° 2015
SLE685 AR 6m5 11m6 290.3'' 150° 2001
SLE335 AS 6m5 10m1 261.7'' 325° 2002
SLE335 CS 9m0 10m1 137.1'' 340° 2002
Christopher Hay
Seeheim (Germany)
71mm (32x) All members A, B, C and D clearly seen and widely separated. A compact group at the northern fringe of M 44 (Praesepe, the Beehive). Component A seems orangish.
Engelmann 37ABCD is a physical group at a distance to us of 608 light years.
Stelledoppie notes about the ENG designation: Some time after publication of the IDS, the designation for Engelmann was changed from EN to ENG and that for Engelhardt from ENG to ENH. This has led to considerable confusion between the two.
★★★ 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
★★★ 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