- Double Stars (Tau) -

And (31) Cep (13) CVn (3) Her (12) Ori (8) Tri (5)
Aql (9) Cet (1) Cyg (19) Leo (11) Peg (16) UMa (10)
Ari (8) CMa (1) Del (2) LMi (4) Per (18) UMi (1)
Aur (27) Cnc (7) 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 (19) Oph (1) Tau (11)

STF401 (**)

Name: STF401
Type: **
Constellation: Tau
Coordinates: 03h31m20.76s / +27°34'18.50"

Components:
m1 m2 ρ θ Year
AB 6m6 6m9 11.5" 270° 2018
120mm f/5, 18x, Bortle 6-, NELM 4.8+, SQM-L 19.1
Barely split at 18x. At 40x difference in brightness is visible. Nice view together with the double star STFA7 located northwest.

STF427 (**)

Name: STF427, V1268 Tau
Type: **
Constellation: Tau
Coordinates: 03h40m38.77s / +28°46'24.00"

Components:
m1 m2 ρ θ Year
7m4 7m8 7.0" 207° 2016
120mm f/5, 40x, Bortle 6-, NELM 4.8+, SQM-L 19.1
At 40x barely split. At 75x easily split with visible difference in brightness.

STF479 (**)

Name: STF479
Type: **
Constellation: Tau
Coordinates: 04h00m56.81s / +23°12'05.40"

Components:
m1 m2 ρ θ Year
AB 6m9 7m8 7.5" 127° 2018
AC 6m9 9m4 57.7" 243° 2018
102mm f/11, 28x, Bortle 6, SQM-L 19.3, Seeing 2/5
Components A & B clearly separated with visible difference in brightness. Noticeably fainter component C much wider apart. All three components form an obtuse triangle.

152mm f/5.9, 49x, Bortle 6, SQM-L 19.3, Seeing 2/5
Nice view. All three components easy to separate. A: white-yellowish; B: creamy white.

8" f/6, 37x, Bortle 4, SQM-L 21.00
AB: Nice, evident double star, easy to split. Slight difference in brightness.

STF494 (**)

Name: STF494
Type: **
Constellation: Tau
Coordinates: 04h08m53.50s / +23°05'55.10"

Components:
m1 m2 ρ θ Year
7m5 7m7 5.2" 187° 2016
102mm f/11, 62x, Bortle 6, SQM-L 19.3, Seeing 2/5
At 28x separated, but very tight, similarly bright, both whitish. At 62x easy to separate, little difference in brightness and color: slightly orange; white-blueish. Color impression slightly more intense at 86x.

152mm f/5.9, 49x, Bortle 6, SQM-L 19.3, Seeing 2/5
Easy to separate at 49x with subtle color differences: slightly orange; white-blueish. Color impression slightly more intense at 100x. Beautiful sight.

STF559 (**)

Name: STF559
Type: **
Constellation: Tau
Coordinates: 04h33m33.04s / +18°01'00.20"

Components:
m1 m2 ρ θ Year
7m0 7m0 3.0" 277° 2018
70mm f/5.7, 57x
Barely split with similarly bright components.

102mm f/11, 160x
Very nice view! Easy to separate, similarly bright at a nice distance from each other. The colors of the components changed over time: orange and subtle blue.

152mm f/5.9, 69x
Beautiful sight, similar bright components, pretty tight.

STF572 (**)

Name: STF572
Type: **
Constellation: Tau
Coordinates: 04h38m29.58s / +26°56'25.60"

Components:
m1 m2 ρ θ Year
AB 7m4 7m2 4.4" 189° 2018
70mm f/5.7, 57x
Clearly separated, easy with beautiful color contrast: A slightly orange, B white.

STF716 (**)

Name: STF716, 118 Tau
Type: **
Constellation: Tau
Coordinates: 05h29m16.49s / +25°09'01.10"

Components:
m1 m2 ρ θ Year
AB 5m8 6m7 4.7" 210° 2018
70mm f/5.7, 33x
At 33x very tight with visible difference in brightness. At 47x very nice view. Both components appeared white.

STF730 (**)

Name: STF730
Type: **
Constellation: Tau
Coordinates: 05h32m14.14s / +17°03'29.30"

Components:
m1 m2 ρ θ Year
AB 6m1 6m4 9.7" 142° 2018
70mm f/5.7, 22x
At 22x beautiful sight, easy to separate with little difference in brightness. A appeared slightly yellowish. At 57x moderate, but still very nice color contrast: A yellowish, B rather white.

STF742 (**)

Name: STF742
Type: **
Constellation: Tau
Coordinates: 05h36m26.38s / +21°59'35.10"

Components:
m1 m2 ρ θ Year
7m1 7m5 4.1" 274° 2017
Located about 0.5 degree east of Messier 1.

102mm f/11, 62x, Bortle 6, SQM-L 19.3, Seeing 2/5
Beautifully separated, relatively tight with well visible difference in brightness. Points directly toward Messier 1 and can be observed with it in one field of view. Very nice!

120mm f/5, 48x, Bortle 6, SQM-L 19.2
Nice, evident double near Messier 1. Easy to split with almost equally bright components.

152mm f/5.9, 69x, Bortle 6, SQM-L 19.3, Seeing 2/5
At 49x just so, at 69x easily separable. The fainter component appeared a little warmer in terms of color. Great view together with Messier 1 in the field of view.

8" f/6, 80x, Bortle 4-, SQM-L 20.8
Nice double star with nearly equally bright components.

STF749 (**)

Name: STF749
Type: **
Constellation: Tau
Coordinates: 05h37m08.84s / +26°55'28.30"

Components:
m1 m2 ρ θ Year
AB 6m5 6m5 1.1" 319° 2017
AC 6m5 10m5 181.6" 299° 2011
70mm f/5.7, 133x
AB: I had the impression that in the correct position angle, without knowing that angle during observation, a minimal elongation could be detected. But observation is borderline and too doubtful.

STFA7 (**)

Name: STFA7
Type: **
Constellation: Tau
Coordinates: 03h31m03.47s / +27°43'53.60"

Components:
m1 m2 ρ θ Year
AB 7m4 7m8 44.1" 234° 2017
120mm f/5, 18x, Bortle 6-, NELM 4.8+, SQM-L 19.1
Well split with noticeable difference in brightness. Nice view together with the double star STF401 located southeast.