- Double Stars (Aur) -

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)

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

Components:
m1 m2 ρ θ Year
AB-C 5.5 8.4 12.0" 269° 2013
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.

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

Components:
m1 m2 ρ θ Year
7.8 8.2 1.7" 125° 2017
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.

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

Components:
m1 m2 ρ θ Year
6.9 8.8 1.7" - 2016
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.

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

Components:
m1 m2 ρ θ Year
AC 7.3 7.6 2.6" 193° 1985
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!?

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

Components:
m1 m2 ρ θ Year
AB 5.0 8.2 4.8" 5° 2014
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.

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

Components:
m1 m2 ρ θ Year
AB 7.0 6.8 1.6" 223° 2018
70mm f/5.7, 100x
At 57x slightly elongated with a partially visible constriction. 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.

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

Components:
m1 m2 ρ θ Year
AB 8.1 8.9 4.7" 62° 2017
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.

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

Components:
m1 m2 ρ θ Year
7.8 7.9 3.1" 76° 2018
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!

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

Components:
m1 m2 ρ θ Year
8.4 9.0 9.9" 278° 2014
55mm f/9.1, 25x, Bortle 6, SQM-L 19.4
Well separated with visible difference in brightness.

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

Components:
m1 m2 ρ θ Year
AB 6.7 8.3 31.3" 348° 2018
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.

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

Components:
m1 m2 ρ θ Year
AB 7.9 8.6 8.9" 346° 2018
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 blueish

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

Components:
m1 m2 ρ θ Year
AB 7.5 7.5 7.7" 73° 2015
55mm f/9.1, 25x, Bortle 6, SQM-L 19.4
Easy to split with similarly bright components. Nive view.

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

Components:
m1 m2 ρ θ Year
AB 7.5 8.8 1.4" 336° 2016
AC 7.5 9.4 15.2" 353° 2016
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-blueish.
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.

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

Components:
m1 m2 ρ θ Year
7.5 8.6 2.7" - 2015
70mm f/5.7, 57x
At 57x split with almost no space in between. At 100x clearly split with noticeable fainter component.

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

Components:
m1 m2 ρ θ Year
6.4 7.1 25.6" 14° 2017
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.

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

Components:
m1 m2 ρ θ Year
AB 7.2 8.2 3.7" 62° 2015
55mm f/9.1, 83x, Bortle 6, SQM-L 19.4
Well split with noticeable fainter companion.

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

Components:
m1 m2 ρ θ Year
6.2 6.9 7.5" 358° 2017
55mm f/9.1, 25x, Bortle 6, SQM-L 19.4
Relatively tight with visible difference in brightness.

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

Components:
m1 m2 ρ θ Year
AB 6.9 7.4 11.3" 215° 2017
55mm f/9.1, 25x, Bortle 6, SQM-L 19.4
Well separated with significant difference in brightness.

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

Components:
m1 m2 ρ θ Year
AB 7.3 8.2 4.9" 336° 2017
55mm f/9.1, 40x, Bortle 6, SQM-L 19.4
At 40x tight, at 55x well split with obviously fainter companion.

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

Components:
m1 m2 ρ θ Year
AB 7.9 8.6 3.5" 132° 2016
152mm f/5.9, 69x, Bortle 6, SQM-L 19.3, Seeing 3/5
Clearly separated, but tight. Moderate difference in brightness. Nice view with the nearby double stars STT147 & STF 929 and the carbon star UU Aur!

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

Components:
m1 m2 ρ θ Year
7.3 8.4 6.5" 24° 2016
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!

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

Components:
m1 m2 ρ θ Year
AB 7.9 8.1 26.4" 55° 2017
55mm f/9.1, 25x, Bortle 6, SQM-L 19.4
Well separated, large distance, slight difference in brightness.

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

Components:
m1 m2 ρ θ Year
AB 6.8 8.7 42.7" 74° 2016
A-CD 6.8 9.8 44.5" 119° 2016
CD 10.6 11.0 0.5" 109° 1957
152mm f/5.9, 69x, Bortle 6, SQM-L 19.3, Seeing 3/5
At 22x, the components A, B and C 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-blueish; C: 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!

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

Components:
m1 m2 ρ θ Year
AB 2.6 7.2 4.2" 305° 2017
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.

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

Components:
m1 m2 ρ θ Year
6.5 7.7 75.2" 277° 2017
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.