- Double Stars (Aur) -

And (32) Cep (13) CVn (4) Her (13) Mon (1) Sex (1)
Aql (9) Cet (1) Cyg (19) Hya (1) Oph (1) Tau (11)
Ari (8) CMa (1) Del (2) Leo (14) Ori (8) Tri (4)
Aur (27) Cnc (10) Dra (8) Lib (1) Peg (16) UMa (11)
Boo (8) Com (1) Equ (5) LMi (4) Per (18) UMi (1)
Cam (5) CrB (4) Eri (1) Lyn (16) Psc (7) Vir (6)
Cas (17) Crv (1) Gem (19) Lyr (8) Ser (2)

26 Aur (**)

Name: 26 Aur, STF753
Type: **
Constellation: Aur
Coordinates: 05h38m38.10s / +30°29'32.80"

Components:
m1 m2 ρ θ Year
AB-C 5m5 8m4 12.0" 269° 2013
Robert Zebahl
70mm f/5.7, 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.

BU 560 (**)

Name: BU560
Type: **
Constellation: Aur
Coordinates: 05h47m24.87s / +29°39'26.90"

Components:
m1 m2 ρ θ Year
7m8 8m2 1.7" 124° 2019

../images/binary-star-orbits/BU560-orbit.jpg

Robert Zebahl
70mm f/5.7, 100x
Clearly visible as a double star with overlapping diffraction disks (figure '8') and small difference in brightness.
152mm f/5.9, 129x, Seeing 2-3/5
Separated with very little difference in brightness, relatively tight. Overall easy.

BU 1053 (**)

Name: BU1053
Type: **
Constellation: Aur
Coordinates: 05h53m28.64s / +37°20'20.70"

Components:
m1 m2 ρ θ Year
6m9 8m8 1.9" - 2019

../images/binary-star-orbits/BU1053-orbit.jpg

Robert Zebahl
70mm f/5.7, 133x
Border observation! Companion is temporarily visible in the correct position angle as an extremely dim brightening of the first diffraction ring of the primary component.

SIN 128 (**)

Name: SIN128
Type: **
Constellation: Aur
Coordinates: 06h01m14.73s / +31°32'28.10"

Components:
m1 m2 ρ θ Year
AC 7m3 7m6 2.6" 193° 1985
Robert Zebahl
70mm f/5.7, 133x
Even at high magnification there are no indications of a double star. Also the brightness seemed to be less than stated!?

STF 616 (**)

Name: STF616, omega Aur, 4 Aur
Type: **
Constellation: Aur
Coordinates: 04h59m15.41s / +37°53'24.90"

Components:
m1 m2 ρ θ Year
AB 5m0 8m2 4.7" 2015
Robert Zebahl
70mm f/5.7, 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.

STF 644 (**)

Name: STF644
Type: **
Constellation: Aur
Coordinates: 05h10m18.81s / +37°18'06.70"

Components:
m1 m2 ρ θ Year
AB 7m0 6m8 1.6" 221° 2019
Robert Zebahl
70mm f/5.7, 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.

102mm f/11, 129x
Grand sight! Two almost touching diffraction disks, slight difference in brightness, both slightly yellowish.

152mm f/5.9, 129x
Great view, easy to separate, but still quite close together with low difference in brightness. Both components appeared slightly orange.

STF 648 (**)

Name: STF648
Type: **
Constellation: Aur
Coordinates: 05h10m59.19s / +32°02'19.50"

Components:
m1 m2 ρ θ Year
AB 8m1 8m9 4.7" 62° 2019

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

Robert Zebahl
55mm f/9.1, 40x, Bortle 6, SQM-L 19.4
At 40x tight with obviously fainter component.
70mm f/5.7, 33x
Separated, but tight with noticeable difference in brightness.

STF 666 (**)

Name: STF666
Type: **
Constellation: Aur
Coordinates: 05h17m05.80s / +33°19'47.20"

Components:
m1 m2 ρ θ Year
7m8 7m9 3.2" 75° 2019
Robert Zebahl
55mm f/9.1, 83x, Bortle 6, SQM-L 19.4
At 40x slightly elongated, at 38x separated, but tight. Overall faint with components of similar brightness.

70mm f/5.7, 57x
Split, no difference in brightness and color. Very nice!

STF 669 (**)

Name: STF669
Type: **
Constellation: Aur
Coordinates: 05h18m56.78s / +45°14'51.40"

Components:
m1 m2 ρ θ Year
8m4 9m0 9.9" 278° 2015
Robert Zebahl
55mm f/9.1, 25x, Bortle 6, SQM-L 19.4
Well separated with visible difference in brightness.

STF 698 (**)

Name: STF698
Type: **
Constellation: Aur
Coordinates: 05h25m12.94s / +34°51'18.60"

Components:
m1 m2 ρ θ Year
AB 6m7 8m3 31.3" 348° 2018
Robert Zebahl
102mm f/11, 62x, Seeing 2-3/5
Beautiful double star, easy to separate and quite striking. Primary component appeared in clear orange, the companion was too faint to identify the color.

152mm f/5.9, 22x, Seeing 2-3/5
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.

STF 699 (**)

Name: STF699
Type: **
Constellation: Aur
Coordinates: 05h25m38.50s / +38°02'41.10"

Components:
m1 m2 ρ θ Year
AB 7m9 8m6 8.9" 346° 2018
Robert Zebahl
55mm f/9.1, 25x, Bortle 6, SQM-L 19.4
Well separated with slightly fainter companion.

70mm f/5.7, 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

STF 718 (**)

Name: STF718
Type: **
Constellation: Aur
Coordinates: 05h32m20.59s / +49°23'36.50"

Components:
m1 m2 ρ θ Year
AB 7m5 7m5 7.7" 73° 2015
Robert Zebahl
55mm f/9.1, 25x, Bortle 6, SQM-L 19.4
Easy to split with similarly bright components. Nive view.

STF 719 (**)

Name: STF719
Type: **
Constellation: Aur
Coordinates: 05h30m06.14s / +29°32'55.30"

Components:
m1 m2 ρ θ Year
AB 7m5 8m8 1.4" 336° 2016
AC 7m5 9m4 15.2" 353° 2016
Robert Zebahl
70mm f/5.7, 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

102mm f/11, 62x, Seeing 2-3/5
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.

152mm f/5.9, 129x, Bortle 5, SQM-L 20.7, Seeing 3/5
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.

152mm f/5.9, 49x, Seeing 2-3/5
AC: Easy to separate with a significant difference in brightness. A appeared in bright orange, B appeared greyish-blue.

STF 736 (**)

Name: STF736
Type: **
Constellation: Aur
Coordinates: 05h37m07.20s / +41°49'41.70"

Components:
m1 m2 ρ θ Year
7m5 8m6 2.7" - 2019
Robert Zebahl
70mm f/5.7, 57x
At 57x split with almost no space in between. At 100x clearly split with noticeable fainter component.

STF 764 (**)

Name: STF764
Type: **
Constellation: Aur
Coordinates: 05h41m20.98s / +29°29'14.70"

Components:
m1 m2 ρ θ Year
6m4 7m1 25.6" 14° 2017
Robert Zebahl
55mm f/9.1, 25x, Bortle 6, SQM-L 19.4
Easy to split with large distance and noticeable difference in brightness.

70mm f/5.7, 22x
Very easy and bright, pretty wide apart with a small difference in brightness; whitish and slightly yellowish. A nice double star for binoculars.

STF 796 (**)

Name: STF796
Type: **
Constellation: Aur
Coordinates: 05h49m55.53s / +31°47'08.70"

Components:
m1 m2 ρ θ Year
AB 7m2 8m2 3.7" 62° 2019
Robert Zebahl
55mm f/9.1, 83x, Bortle 6, SQM-L 19.4
Well split with noticeable fainter companion.

STF 845 (**)

Name: STF845, 41 Aur
Type: **
Constellation: Aur
Coordinates: 06h11m36.59s / +48°42'39.60"

Components:
m1 m2 ρ θ Year
6m2 6m9 7.6" 357° 2018
Robert Zebahl
55mm f/9.1, 25x, Bortle 6, SQM-L 19.4
Relatively tight with visible difference in brightness.

STF 872 (**)

Name: STF872
Type: **
Constellation: Aur
Coordinates: 06h15m39.06s / +36°08'55.30"

Components:
m1 m2 ρ θ Year
AB 6m9 7m4 11.3" 215° 2017
Robert Zebahl
55mm f/9.1, 25x, Bortle 6, SQM-L 19.4
Well separated with significant difference in brightness.

STF 918 (**)

Name: STF918
Type: **
Constellation: Aur
Coordinates: 06h33m57.62s / +52°27'41.80"

Components:
m1 m2 ρ θ Year
AB 7m3 8m2 4.9" 336° 2019
Robert Zebahl
55mm f/9.1, 40x, Bortle 6, SQM-L 19.4
At 40x tight, at 55x well split with obviously fainter companion.

STF 928 (**)

Name: STF928
Type: **
Constellation: Aur
Coordinates: 06h34m41.81s / +38°32'24.50"

Components:
m1 m2 ρ θ Year
AB 7m9 8m6 3.4" 131° 2019
AC 7m9 12m4 130.9" 124° 2002
BC 8m6 12m4 127.3" 124° 2015
Robert Zebahl
102mm f/11, 62x, Bortle 6
AB: At 28x the double star already appeared elongated, at 62x beautifully separated, with component A shining in a warm, decent orange. At 125x A appeared orange, B grey-bluish.

152mm f/5.9, 69x, Bortle 6, SQM-L 19.3, Seeing 3/5
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!

STF 929 (**)

Name: STF929
Type: **
Constellation: Aur
Coordinates: 06h35m22.03s / +37°42'55.10"

Components:
m1 m2 ρ θ Year
7m3 8m4 6.5" 24° 2016
Robert Zebahl
152mm f/5.9, 69x, Bortle 6, SQM-L 19.3, Seeing 3/5
Easy to separate, clear difference in brightness, slight color contrast. Primary component showed a slight orange color, the color of the companion was not clearly defineable. Nice view with the nearby double stars STT147 & STF 928 and the carbon star UU Aur!

STF 941 (**)

Name: STF941
Type: **
Constellation: Aur
Coordinates: 06h38m40.76s / +41°34'53.40"

Components:
m1 m2 ρ θ Year
AB 7m2 8m2 2.0" 83° 2019
AC 7m2 10m5 83.9" 135° 2015
Robert Zebahl
102mm f/11, 86x, Bortle 6
AB: At 62x only visible as figure '8'. The difference in brightness is hardly noticeable. At 86x barely separated, obvious. Clearly separated at 125x, but still tight with a moderate brightness difference.

102mm f/11, 28x, Bortle 6
AC: Distant, faint companion that is less attracting attention. Used magnifications between 28x and 125x.

STF 974 (**)

Name: STF974, 59 Aur
Type: **
Constellation: Aur
Coordinates: 06h53m01.41s / +38°52'08.90"

Components:
m1 m2 ρ θ Year
AB 6m1 10m2 22.2" 224° 2015
BC 10m2 12m8 25.6" 219° 2015
Robert Zebahl
102mm f/11, 28x, Bortle 6
AB: Easy, moderate distance, pretty uneven. A appeared white-yellowish, B only as a tiny star.

STF 994 (**)

Name: STF994
Type: **
Constellation: Aur
Coordinates: 06h59m27.19s / +37°05'53.50"

Components:
m1 m2 ρ θ Year
AB 7m9 8m1 26.4" 55° 2017
Robert Zebahl
55mm f/9.1, 25x, Bortle 6, SQM-L 19.4
Well separated, large distance, slight difference in brightness.

STT 147 (**)

Name: STT147
Type: **
Constellation: Aur
Coordinates: 06h34m19.37s / +38°04'33.60"

Components:
m1 m2 ρ θ Year
AB 6m8 8m7 42.7" 74° 2016
A-CD 6m8 9m8 44.5" 119° 2016
CD 10m6 11m0 0.5" 109° 1957
Robert Zebahl
152mm f/5.9, 69x, Bortle 6, SQM-L 19.3, Seeing 3/5
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!

STT 545 (**)

Name: STT545, 37 Aur, theta Aur
Type: **
Constellation: Aur
Coordinates: 05h59m43.24s / +37°12'45.90"

Components:
m1 m2 ρ θ Year
AB 2m6 7m2 4.1" 303° 2018

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

Robert Zebahl
70mm f/5.7, 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.

STTA 63 (**)

Name: STTA63
Type: **
Constellation: Aur
Coordinates: 05h30m45.08s / +39°49'33.30"

Components:
m1 m2 ρ θ Year
6m5 7m7 75.2" 277° 2017
Robert Zebahl
70mm f/5.7, 22x, Bortle 6
At 22x widely separated, visible difference in brightness. Slight difference in color: white-yellowish (at 44x light orange), slightly orange.