- Double Stars (Gem) -

And (55) Cep (25) Cyg (93) Leo (35) Peg (34) SGE (1)
Aql (52) Cet (5) Del (16) Lep (6) Per (35) Sgr (10)
Aqr (4) CMa (5) Dra (19) Lib (1) Psc (17) Tau (15)
Ari (8) CMi (3) Equ (7) LMi (6) Pup (1) Tri (5)
Aur (28) Cnc (10) Eri (3) Lyn (18) Sco (4) UMa (46)
Boo (32) Com (13) Gem (30) Lyr (32) Sct (4) UMi (5)
Cam (17) CrB (10) Her (58) Mon (12) Ser (21) Vir (20)
Cap (6) Crv (4) Hya (11) Oph (14) Sex (6) Vul (12)
Cas (39) CVn (16) Lac (13) Ori (38) Sge (8)

A 1061 & STF 1000 (**)

Name: A1061 & STF1000, WDS06594+2514
Type: **
Constellation: Gem
Coordinates: 06h59m21.15s / +25°14'00.20"

Components:
m1 m2 ρ θ Year
A1061 AB 8m9 9m1 0.6" 42° 1999
STF1000 AB-C 8m1 9m0 22.1" 67° 2016

../images/binary-star-orbits/A1061-AB-orbit.jpg

René Merting
100mm f/6.4, 32x
STF1000 (AB-C): bei 32x ein bequem getrenntes Pärchen - Komponente AB kühlweiß - Komponente C im Osten ist eine dreiviertel Größenklasse schwächer und grauweiß

BU 1008 (**)

Name: BU1008, eta Gem, 7 Gem, Propus
Type: **
Constellation: Gem
Coordinates: 06h14m52.69s / +22°30'24.60"

Components:
m1 m2 ρ θ Year
3m5 6m2 1.7" 255° 2018

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

Robert Zebahl
152mm f/5.9, 225x, Bortle 6, SQM-L 19.3, Seeing 3/5
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.

ES 2625 & S 548 (**)

Name: ES2625 & S548, WDS07277+2208
Type: **
Constellation: Gem
Coordinates: 07h27m40.54s / +22°08'29.30"

Components:
m1 m2 ρ θ Year
ES2625 AB 7m0 12m4 11.9" 24° 2015
S548 AC 7m0 8m9 35.3" 277° 2019
René Merting
100mm f/6.4, 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

HJ 3288 (**)

Name: HJ3288
Type: **
Constellation: Gem
Coordinates: 07h02m18.43s / +12°34'54.20"

Components:
m1 m2 ρ θ Year
7m3 8m7 38.5" 247° 2015
Robert Zebahl
70mm f/5.7, 22x, Bortle 6
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.

../sketches/2019-12-18_stf1007_hj3288.jpg

S 513 (**)

Name: S513
Type: **
Constellation: Gem
Coordinates: 06h21m14.48s / +21°07'56.70"

Components:
m1 m2 ρ θ Year
AB 7m3 8m9 59.4" 258° 2014
AC 7m3 12m0 47.1" 251° 2014
AD 7m3 7m6 264.9" 24° 2015
AE 7m3 11m3 83.5" 285° 2015
BE 8m9 11m3 40.7" 327° 2015
BT 8m9 12m2 37.8" 295° 2014
René Merting
B 18x70
AB: weit getrenntes Pärchen - Komponente B im Westen ist gut 1.5 Größenklassen schwächer und wirkt dadurch bräunlich ggü. der weiß schimmernden Komponente A

100mm f/6.4, 20x
AB: bei 32x popeleinfach, weit getrennt - Komponente B im Westen ist gut 1.5 Magnituden schwächer - zurück auf 20x nach wie vor sehr einfach, ein unauffälliger Doppelstern

S 524 (**)

Name: S524
Type: **
Constellation: Gem
Coordinates: 06h34m07.10s / +22°07'27.20"

Components:
m1 m2 ρ θ Year
AB 7m2 7m4 53.0" 244° 2017
René Merting
B 18x70
AB: popeleinfach mit dem FG - ein mehr als gut getrenntes Pärchen zweier gleich heller Sterne - die östliche Komponente wirkt ein klein wenig heller - A warmweiß, B blauweiß

100mm f/6.4, 20x
AB: bei 32x zeigen sich zwei annähernd gleichhelle Sterne weit getrennt voneinander - Komponente B im SW wirkt kühler als A
AC: bei 32x ist südöstlich von A in doppeltem Abstand wie AB eine weitere Komponente erkennbar - C ist mindestens 2 Größenklassen schwächer als B - alle drei Sterne bilden ein schönes rechtwinkliges Dreieck, wobei die Ecke von A den rechten Winkel bildet - zurück auf 20x ist C auch noch knapp sichtbar

S 529 (**)

Name: S529
Type: **
Constellation: Gem
Coordinates: 06h37m33.90s / +12°10'50.00"

Components:
m1 m2 ρ θ Year
AB 6m9 9m3 52.7" 130° 2019
AC 6m9 8m1 143.5" 165° 2012
René Merting
B 18x70
AB: ein weit getrenntes Sternpaar - Komponente B im SO ist kupferbraun, die gut 2 bis 2.5 Größenklassen hellere Komponente A strahlt weiß

SHJ 70 (**)

Name: SHJ70, 15 Gem
Type: **
Constellation: Gem
Coordinates: 06h27m46.58s / +20°47'22.60"

Components:
m1 m2 ρ θ Year
AB 6m7 8m2 24.7" 203° 2019
AC 6m7 12m7 85.6" 35° 2015
Robert Zebahl
B 16x70
AB: 2021-02-22: Clearly split with noticeable difference in brightness. Pale orange with much fainter companion. Together with Nu Gem & 16 Gem in a nice curved star chain.

René Merting
B 18x70
AB: ein schönes enges Sternpaar, Komponente B ist SW ist ordentlich getrennt von A zu erkennen - etwas über eine Größenklasse Helligkeitsunterschied, dadurch leichter Farbkontrast

STF 889 (**)

Name: STF889
Type: **
Constellation: Gem
Coordinates: 06h19m51.77s / +25°00'49.10"

Components:
m1 m2 ρ θ Year
AB 7m6 9m9 21.3" 244° 2015
René Merting
B 18x70
mit etwas Konzentration sind beide Sterne getrennt zu erkennen - A und B sind halb so weit voneinander entfernt wie das nahe liegende Pärchen STTA74 - Komponente B im SW ist genauso schwach wie B bei STTA74, aber dadurch, dass er näher zum Hauptstern steht, ist er schwächer sichtbar

100mm f/6.4, 32x
bei 32x unscheinbarer als der 14' nordöstlich liegende STTA74 - die Komponenten von STF889 wirken beide schwächer als die von STTA74 - Komponente B im SW ist gerade so erkennbar, Helligkeitsunterschied mindestens 2 Größenklassen, B ist gut abgesetzt von A - Farbkontrast gelblich, B farblos

STF 899 (**)

Name: STF899
Type: **
Constellation: Gem
Coordinates: 06h22m49.64s / +17°34'27.30"

Components:
m1 m2 ρ θ Year
7m4 8m0 2.2" 17° 2019
Robert Zebahl
70mm f/5.7, 133x
Separated, but tight with visible difference in brightness.

STF 924 (**)

Name: STF924, 20 Gem
Type: **
Constellation: Gem
Coordinates: 06h32m18.52s / +17°47'03.40"

Components:
m1 m2 ρ θ Year
AB 6m3 6m9 19.9" 212° 2019
BC 6m9 13m0 47.8" 144° 2014
Robert Zebahl
B 16x70
AB: 2021-02-22: Easy to separate with small difference in brightness. Conspicuous double star. White-yellowish & white-bluish.

70mm f/5.7, 22x
AB: At 22x bright, immediately conspicuous, although in a relatively star-rich surrounding. Moderate but beautiful color contrast: bright orange, subtle blue. Also at 44x very beautiful sight.

152mm f/5.9, 69x, Bortle 6, SQM-L 19.3, Seeing 3/5
AB: Easy, bright, moderately uneven. Nice contrast in color: slight orange, white-bluish.

René Merting
B 18x70
AB: das dicht stehende Paar fällt sofort ins Auge - Komponente A im Norden ist vielleicht eine halbe Magnitude heller als Komponente B, die leicht gräulich strahlt

STF 932 (**)

Name: STF932
Type: **
Constellation: Gem
Coordinates: 06h34m21.57s / +14°45'08.30"

Components:
m1 m2 ρ θ Year
8m3 8m5 1.6" 305° 2019

../images/binary-star-orbits/STF932-orbit.jpg

Robert Zebahl
70mm f/5.7, 150x
Unfortunately a nearby lamp bothered me. I could see the double star at least elongated.

STF 957 (**)

Name: STF957
Type: **
Constellation: Gem
Coordinates: 06h45m10.02s / +30°49'33.50"

Components:
m1 m2 ρ θ Year
AB 7m5 9m4 3.8" 90° 2019
AC 7m5 13m8 19.3" 100° 2015
Robert Zebahl
70mm f/5.7, 100x
AB: Too faint for a separation. Primary component visible, companion not. Used magnifications from 67x to 133x. Observation from city at moon (83%).

152mm f/5.9, 129x, Bortle 6, SQM-L 19.3, Seeing 3/5
AB: Easy with significant difference in brightness and moderate angular distance.

STF 982 (**)

Name: STF982, 38 Gem
Type: **
Constellation: Gem
Coordinates: 06h54m38.63s / +13°10'40.10"

Components:
m1 m2 ρ θ Year
AB 4m8 7m8 7.3" 145° 2018

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

Robert Zebahl
55mm f/9.1, 27x
At 27x pretty tight with much fainter component. At 71x clearly separated with clear difference in brightness. Brighter component appeared slightly yellowish, the weaker one slightly bluish.

70mm f/5.7, 33x
Easy to separated with noticeable difference in brightness. The fainter component appeared slightly orange, the brighter one rather white.

STF 1007 (**)

Name: STF1007
Type: **
Constellation: Gem
Coordinates: 07h00m37.12s / +12°43'24.20"

Components:
m1 m2 ρ θ Year
AB 7m4 11m4 14.6" 300° 2015
AC 7m4 10m0 21.9" 244° 2015
AD 7m4 7m7 67.7" 28° 2016
Robert Zebahl
70mm f/5.7, 22x, Bortle 6
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.

../sketches/2019-12-18_stf1007_hj3288.jpg

STF 1035 (**)

Name: STF1035
Type: **
Constellation: Gem
Coordinates: 07h12m01.06s / +22°16'44.50"

Components:
m1 m2 ρ θ Year
8m1 8m4 8.7" 40° 2018
Robert Zebahl
B 16x70
2021-02-22: Separate, but very close together. Small difference in brightness visible.

STF 1066 (**)

Name: STF1066, delta Gem, 55 Gem
Type: **
Constellation: Gem
Coordinates: 07h20m07.39s / +21°58'56.40"

Components:
m1 m2 ρ θ Year
3m5 8m2 5.4" 234° 2017

../images/binary-star-orbits/STF1066-orbit.jpg

Robert Zebahl
55mm f/9.1, 71x
Large difference in brightness. The fainter component was well separated, but just a very tiny star.

102mm f/11, 160x, Bortle 7, SQM-L 18.8, Seeing 3-4/5
Easy to separate with relatively large distance. The companion appeared as a tiny, faint star.

STF 1081 (**)

Name: STF1081
Type: **
Constellation: Gem
Coordinates: 07h24m08.94s / +21°27'28.00"

Components:
m1 m2 ρ θ Year
AB 7m7 8m5 1.9" 234° 2019
AC 7m7 9m9 107.0" 63° 2015
Robert Zebahl
102mm f/11, 86x, Bortle 6
AB: At 86x just separated, very close together with moderate difference in brightness. In relation to A, the components B & C are almost opposite each other. At 125x, A & B are easy to split.

102mm f/11, 28x, Bortle 6
AC: Rather wide apart from component A with noticeable difference in brightness. Less conspicuous.

STF 1083 (**)

Name: STF1083
Type: **
Constellation: Gem
Coordinates: 07h25m35.30s / +20°29'42.60"

Components:
m1 m2 ρ θ Year
7m3 8m1 6.9" 226° 2019
Robert Zebahl
70mm f/5.7, 22x
Unequal pair. At 22x very tight, at 44x well split. Fainter companion appeared slightly orange, brighter one white-bluish.

STF 1094 (**)

Name: STF1094
Type: **
Constellation: Gem
Coordinates: 07h27m25.99s / +15°18'59.00"

Components:
m1 m2 ρ θ Year
7m6 8m5 2.5" 97° 2019
Robert Zebahl
70mm f/5.7, 57x
At 57x barely split with noticeable difference in brightness. At 100x well split, but still tight.

STF 1108 (**)

Name: STF1108
Type: **
Constellation: Gem
Coordinates: 07h32m50.63s / +22°53'15.40"

Components:
m1 m2 ρ θ Year
6m6 8m2 11.7" 179° 2019
Robert Zebahl
B 16x70
2021-02-22: Separated with clearly visible brightness difference. The primary component appeared whitish, the companion appeared slightly separated only as a very faint tiny star.

René Merting
100mm f/6.4, 32x
bei 32x ein sehr ungleiches enges Paar, aber klar getrennt - Komponente B im Süden ist knapp zwei Größenklassen schwächer - Komponente A buttergelb - zurück auf 20x verschmilzt Komponente B förmlich mit A zu einer sehr ungleichen 8, in guten Momenten sind beide Sterne aber dennoch schon getrennt sichtbar

STF 1110 (**)

Name: STF1110, alpha Gem, 66 Gem, Castor
Type: **
Constellation: Gem
Coordinates: 07h34m35.86s / +31°53'17.80"

Components:
m1 m2 ρ θ Year
AB 1m9 3m0 5.5" 53° 2019
AC 1m9 9m8 69.8" 163° 2017
AD 1m9 10m1 179.8" 221° 2017

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

Robert Zebahl
55mm f/9.1, 27x
AB: At 27x slight difference in brightness visible. Double star appeared as '8'. At 38x clearly split, but tight.

70mm f/5.7, 44x, Bortle 6
AB: At 44x the double star appeared as an '8'. At 100x clearly split with noticeable difference in brightness. Both components appeared white.

René Merting
100mm f/6.4, 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

STF 1140 (**)

Name: STF1140
Type: **
Constellation: Gem
Coordinates: 07h48m22.61s / +18°20'12.40"

Components:
m1 m2 ρ θ Year
7m0 8m7 6.4" 273° 2015
Robert Zebahl
70mm f/5.7, 44x
Easy to separate with quite clear difference in brightness.

STT 134 (**)

Name: STT134
Type: **
Constellation: Gem
Coordinates: 06h09m15.94s / +24°25'40.30"

Components:
m1 m2 ρ θ Year
AB 7m5 9m1 31.0" 189° 2015
René Merting
100mm f/6.4, 32x
bei 32x zeigt sich südlich von A ein gut 1.5 Magnituden schwächerer Begleiter - ein ordentlich getrenntes Pärchen - im Umfeld nicht sehr auffällig (logisch bei einem Doppelstern in M 35)

STT 167 (**)

Name: STT167
Type: **
Constellation: Gem
Coordinates: 07h13m30.95s / +32°08'43.70"

Components:
m1 m2 ρ θ Year
AB 7m4 10m9 5.1" 163° 2017
Robert Zebahl
70mm f/5.7, 133x
Too faint for a separation. Primary component visible, no sign of the companion. Observation from city at moon (83%).

152mm f/5.9, 270x, Bortle 6, SQM-L 19.3, Seeing 3/5
At a position angle of about 180° I sometimes had the feeling to see something of the faint companion, but not sure.

STT 179 (**)

Name: STT179, kappa Gem, 77 Gem
Type: **
Constellation: Gem
Coordinates: 07h44m26.87s / +24°23'53.30"

Components:
m1 m2 ρ θ Year
3m7 10m0 7.2" 243° 2019
Robert Zebahl
70mm f/5.7, 133x
Observation at nearly full moon: Fainter companion was not visible.

120mm f/5, 200x, Bortle 6-, SQM-L 18.9
Although the optics were not yet completely cooled down, the fainter component could be seen slightly outside the first diffraction ring as a tiny star in moments of steady air.

René Merting
100mm f/6.4, 213x
bei 213x mit viel Geduld ist blickweise Komponente B südwestlich von A im Beugungsscheibchen erkennbar - kaum wie ein Stern, einfach nur eine schwache Aufhellung

STTA 74 (**)

Name: STTA74
Type: **
Constellation: Gem
Coordinates: 06h20m36.35s / +25°11'20.40"

Components:
m1 m2 ρ θ Year
AB 7m1 8m9 57.4" 265° 2015
AC 7m1 12m0 41.5" 291° 2015
René Merting
B 18x70
AB: westlich von Komponente A blinkt in ziemlich weitem Abstand die viel schwächere Komponente B hervor - A ist reinweiß, B wirkt grau

100mm f/6.4, 32x
AB: bei 32x weit getrennt - Komponente B im SW ist 1.5 Magnituden schwächer und wirkt farblos gegen die weiß strahlende Komponente A

STTA 80 (**)

Name: STTA80
Type: **
Constellation: Gem
Coordinates: 06h58m06.59s / +14°13'43.40"

Components:
m1 m2 ρ θ Year
AB 7m2 7m4 124.1" 53° 2015
AC 7m2 8m4 81.2" 112° 2015
Robert Zebahl
70mm f/5.7, 22x, Bortle 6
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.

../sketches/2019-12-18_stta80.jpg

STTA 83 & HO 519 (**)

Name: STTA83 & HO519, WDS07096+2544
Type: **
Constellation: Gem
Coordinates: 07h09m35.47s / +25°43'44.70"

Components:
m1 m2 ρ θ Year
HO519 AB 7m2 13m0 32.5" 73° 2015
STTA83 AC 7m2 7m8 123.3" 79° 2015
Robert Zebahl
70mm f/5.7, 22x, Bortle 6
STTA83 (AC): Wide pair, relatively bright, moderate difference in brightness. A: slightly orange; C: grey-blue. Southeast of the pair in a much larger distance there is another, fainter star, which appears orange, partly reddish. It does not belong to the system. All three stars form a beautiful right-angled triangle.

STTA 89 (**)

Name: STTA89
Type: **
Constellation: Gem
Coordinates: 07h51m00.20s / +31°36'48.70"

Components:
m1 m2 ρ θ Year
6m8 7m7 76.6" 84° 2017
Robert Zebahl
70mm f/5.7, 22x
At 22x widely separated with moderate difference in brightness. The primary component appeared whitish, at 44x rather white-yellowish. The companion appeared slightly orange.