- Double Stars (Tau) -

And (60) Cep (28) Cyg (99) Leo (35) Peg (43) Sgr (11)
Aql (60) Cet (5) Del (16) Lep (7) Per (42) Tau (19)
Aqr (4) CMa (6) Dra (27) Lib (4) Psc (18) Tri (10)
Ari (8) CMi (3) Equ (7) LMi (6) Pup (3) UMa (47)
Aur (32) Cnc (14) Eri (6) Lyn (18) Sco (5) UMi (5)
Boo (32) Com (13) Gem (33) Lyr (32) Sct (5) Vir (20)
Cam (19) CrB (10) Her (59) Mon (14) Ser (22) Vul (12)
Cap (7) Crv (4) Hya (11) Oph (18) Sex (6)
Cas (44) CVn (15) Lac (13) Ori (39) Sge (10)

HJ 3253 (**)
Name: HJ3253
Type: **
Constellation: Tau
Coordinates: 03h52m10.39s / +26°13'53.00"

Components:
m1 m2 ρ θ Year
8m.1 9m.7 31.9" 73° 2015
René Merting
B 18x70
Komponente B zeigt sich schwach aber gut getrennt östlich von A - mindestens 1.5 Größenklassen Helligkeitsunterschied

KU 87 (**)
Name: KU87
Type: **
Constellation: Tau
Coordinates: 05h21m39.91s / +18°54'24.50"

Components:
m1 m2 ρ θ Year
AB 7m.8 10m.0 35.9" 104° 2015
René Merting
B 18x70
eine echte Herausforderung - Komponente B taucht mit etwas Konzentration ganz schwach östlich von A auf - Komponente A ist schon relativ schwach, B ist schätzungsweise 2 Größenklassen schwächer

STF 401 (**)
Name: STF401
Type: **
Constellation: Tau
Coordinates: 03h31m20.76s / +27°34'18.50"

Components:
m1 m2 ρ θ Year
AB 6m.6 6m.9 11.4" 269° 2020
Robert Zebahl
120mm f/5, 18x, Bortle 6-, NELM 4m.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.

STF 427 (**)
Name: STF427, V1268 Tau
Type: **
Constellation: Tau
Coordinates: 03h40m38.77s / +28°46'24.00"

Components:
m1 m2 ρ θ Year
AB 7m.4 7m.8 7.0" 207° 2020
Robert Zebahl
120mm f/5, 40x, Bortle 6-, NELM 4m.8+, SQM-L 19.1
At 40x barely split. At 75x easily split with visible difference in brightness.

STF 479 (**)
Name: STF479
Type: **
Constellation: Tau
Coordinates: 04h00m56.81s / +23°12'05.40"

Components:
m1 m2 ρ θ Year
AB 6m.9 7m.8 7.5" 126° 2020
AC 6m.9 9m.4 57.8" 243° 2019
Robert Zebahl
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.

STF 494 (**)
Name: STF494
Type: **
Constellation: Tau
Coordinates: 04h08m53.50s / +23°05'55.10"

Components:
m1 m2 ρ θ Year
7m.5 7m.7 5.5" 187° 2021
Robert Zebahl
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-bluish. 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-bluish. Color impression slightly more intense at 100x. Beautiful sight.

STF 495 (**)
Name: STF495
Type: **
Constellation: Tau
Coordinates: 04h07m41.98s / +15°09'46.10"

Components:
m1 m2 ρ θ Year
AB 6m.1 8m.8 3.6" 222° 2016
Robert Zebahl
102mm f/11, 125x, Bortle 6, SQM-L 19.3
2022-01-01: Easily split with a clear difference in brightness and moderate separation. The primary component appears white-yellowish, the faint companion grayish.

STF 559 (**)
Name: STF559
Type: **
Constellation: Tau
Coordinates: 04h33m33.04s / +18°01'00.20"

Components:
m1 m2 ρ θ Year
7m.0 7m.0 3.1" 275° 2021
Robert Zebahl
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.

STF 572 (**)
Name: STF572
Type: **
Constellation: Tau
Coordinates: 04h38m29.58s / +26°56'25.60"

Components:
m1 m2 ρ θ Year
AB 7m.4 7m.2 4.5" 188° 2021

../images/binary-star-orbits/STF572-AB-orbit.jpg

Robert Zebahl
70mm f/5.7, 57x
Clearly separated, easy with beautiful color contrast: A slightly orange, B white.

STF 716 (**)
Name: STF716, 118 Tau
Type: **
Constellation: Tau
Coordinates: 05h29m16.49s / +25°09'01.10"

Components:
m1 m2 ρ θ Year
AB 5m.8 6m.7 4.6" 209° 2020
AC 5m.8 11m.9 140.2" 99° 2001
Robert Zebahl
70mm f/5.7, 33x
AB: At 33x very tight with visible difference in brightness. At 47x very nice view. Both components appeared white.

STF 730 (**)
Name: STF730
Type: **
Constellation: Tau
Coordinates: 05h32m14.14s / +17°03'29.30"

Components:
m1 m2 ρ θ Year
AB 6m.1 6m.4 9.7" 142° 2019
Robert Zebahl
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.

STF 742 (**)
Name: STF742
Type: **
Constellation: Tau
Coordinates: 05h36m26.38s / +21°59'35.10"

Components:
m1 m2 ρ θ Year
7m.1 7m.5 4.1" 275° 2019
Located about 0.5 degree east of Messier 1.

../images/binary-star-orbits/STF742-orbit.jpg

Robert Zebahl
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.

STF 749 (**)
Name: STF749
Type: **
Constellation: Tau
Coordinates: 05h37m08.84s / +26°55'28.30"

Components:
m1 m2 ρ θ Year
AB 6m.5 6m.5 1.1" 324° 2019
AC 6m.5 10m.5 181.6" 299° 2011

../images/binary-star-orbits/STF749-AB-orbit.jpg

Robert Zebahl
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.

STF 805 (**)
Name: STF805
Type: **
Constellation: Tau
Coordinates: 05h51m48.20s / +28°26'59.60"

Components:
m1 m2 ρ θ Year
8m.4 8m.9 12.1" 50° 2015
René Merting
100mm f/6.4, 32x
bei 32x ein schwaches Paar - Komponente B zeigt sich knapp abgesetzt im NO von A und ist eine halbe Größenklasse schwächer - unauffällig trotz scheinbarer Sternarmut im Umfeld

STFA 7 (**)
Name: STFA7
Type: **
Constellation: Tau
Coordinates: 03h31m03.47s / +27°43'53.60"

Components:
m1 m2 ρ θ Year
AB 7m.4 7m.8 44.1" 234° 2017
Robert Zebahl
120mm f/5, 18x, Bortle 6-, NELM 4m.8+, SQM-L 19.1
Well split with noticeable difference in brightness. Nice view together with the double star STF401 located southeast.

STTA 45 (**)
Name: STTA45, V774 Tau
Type: **
Constellation: Tau
Coordinates: 04h15m28.86s / +06°11'13.60"

Components:
m1 m2 ρ θ Year
AB 6m.4 7m.0 64.6" 316° 2021
René Merting
B 12x42
ein schickes Sternpaar - Komponente B steht in einigem Abstand nordwestlich von A - leichter Farbkontrast, A leicht gelblich, B wirkt schmutzig braunweiß

STTA 49 (**)
Name: STTA49
Type: **
Constellation: Tau
Coordinates: 04h18m58.95s / +01°45'01.50"

Components:
m1 m2 ρ θ Year
7m.8 7m.9 102.7" 324° 2015
René Merting
B 12x42
ein gleichhelles Pärchen mit Südost-Nordwest-Ausdehnung - die schwächere Komponente im Südosten zeigt sich mehr als komfortabel getrennt von A - das Paar ist trotzdem auffällig, da es isoliert steht - im erweiterten Umfeld sind viele gleich helle Sterne zu sehen

STTA 53 (**)
Name: STTA53
Type: **
Constellation: Tau
Coordinates: 04h37m26.72s / +00°33'11.20"

Components:
m1 m2 ρ θ Year
7m.5 7m.6 78.8" 352° 2017
René Merting
B 12x42
zwei gleich helle Sterne nordsüd-ausgerichtet - zwei graue Mäuse, komfortabel getrennt

XMI 9 (**)
Name: XMI9
Type: **
Constellation: Tau
Coordinates: 05h35m44.56s / +18°45'29.30"

Components:
m1 m2 ρ θ Year
7m.9 9m.7 30.1" 60° 2015
René Merting
B 18x70
eine echte Herausforderung - Komponente B taucht mit etwas Konzentration ganz schwach östlich von A auf, der Abstand ist ordentlich - B ist schätzungsweise 1.5 bis 2 Größenklassen schwächer - Komponente A strahlt schneeweiß, B wirkt wegen des Helligkeitsunterschiedes grau