- Double Stars (Gem) -

And (31) Cep (13) CVn (2) Her (12) Ori (8) Tri (5)
Aql (9) Cet (1) Cyg (19) Leo (11) Peg (16) UMa (9)
Ari (8) CMa (1) Del (2) LMi (4) Per (18) UMi (1)
Aur (25) Cnc (4) Dra (8) Lyn (11) Psc (7) Vir (6)
Boo (8) Com (1) Equ (5) Lyr (8) Ser (3)
Cam (5) CrB (4) Eri (1) Mon (1) Sex (1)
Cas (17) Crv (1) Gem (18) Oph (1) Tau (11)

BU1008 (**)

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

Components:
m1 m2 ρ θ Year
3.5 6.2 1.8" 258° 2017
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.

HJ3288 (**)

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

Components:
m1 m2 ρ θ Year
7.3 8.7 38.5" 247° 2015
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.

STF899 (**)

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

Components:
m1 m2 ρ θ Year
7.4 8.0 2.2" 18° 2018
70mm f/5.7, 133x
Separated, but tight with visible difference in brightness.

STF924 (**)

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

Components:
m1 m2 ρ θ Year
AB 6.3 6.9 20.7" 212° 2017
BC 6.9 13.0 47.8" 144° 2014
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, decent 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-blueish.

STF932 (**)

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

Components:
m1 m2 ρ θ Year
8.3 8.5 1.6" 305° 2017
70mm f/5.7, 150x
Unfortunately a nearby lamp bothered me. I could see the double star at least elongated.

STF957 (**)

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

Components:
m1 m2 ρ θ Year
AB 7.5 9.4 3.6" 91° 2009
AC 7.5 13.8 19.3" 100° 2015
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.

STF982 (**)

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

Components:
m1 m2 ρ θ Year
AB 4.8 7.8 7.4" 143° 2018
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.

STF1007 (**)

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

Components:
m1 m2 ρ θ Year
AB 7.4 11.4 14.6" 300° 2015
AC 7.4 10.0 21.9" 244° 2015
AD 7.4 7.7 67.7" 28° 2016
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

STF1066 (**)

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

Components:
m1 m2 ρ θ Year
3.5 8.2 5.5" 230° 2016
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.

STF1083 (**)

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

Components:
m1 m2 ρ θ Year
7.3 8.1 6.7" 45° 2015
70mm f/5.7, 22x
Unequal pair. At 22x very tight, at 44x well split. Fainter companion appeared slightly orange, brighter one white-bluish.

STF1094 (**)

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

Components:
m1 m2 ρ θ Year
7.6 8.5 2.7" 100° 2014
70mm f/5.7, 57x
At 57x barely split with noticeable difference in brightness. At 100x well split, but still tight.

STF1110 (**)

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

Components:
m1 m2 ρ θ Year
AB 1.9 3.0 5.1" 54° 2017
AC 1.9 9.8 69.8" 163° 2017
AD 1.9 10.1 179.8" 221° 2017
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.

STF1140 (**)

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

Components:
m1 m2 ρ θ Year
7.0 8.7 6.4" 273° 2015
70mm f/5.7, 44x
Easy to separate with quite clear difference in brightness.

STT167 (**)

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

Components:
m1 m2 ρ θ Year
AB 7.4 10.9 5.1" 163° 2017
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.

STT179 (**)

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

Components:
m1 m2 ρ θ Year
3.7 10.0 7.2" 241° 2014
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.

STTA80 (**)

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

Components:
m1 m2 ρ θ Year
AB 7.2 7.4 124.1" 53° 2015
AC 7.2 8.4 81.2" 112° 2015
70mm f/5.7, 22x, Bortle 6
All 3 components form a striking triangle and are slightly different in color. A (western component): white-blueish; B (northern component): white-yellowish; C (southern component): orange, partly slightly reddish.

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

STTA83/HO519 (**)

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

Components:
m1 m2 ρ θ Year
HO519 AB 7.2 13.0 32.5" 73° 2015
STTA83 AC 7.2 7.8 123.3" 79° 2015
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.

STTA89 (**)

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

Components:
m1 m2 ρ θ Year
6.8 7.7 76.8" 84° 2015
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.