- Double Stars (Ari) -

And (60) Cep (31) Cyg (101) Leo (38) Peg (43) Sgr (11)
Aql (60) Cet (9) Del (16) Lep (7) Per (44) Tau (35)
Aqr (4) CMa (10) Dra (34) Lib (4) Psc (18) Tri (10)
Ari (11) CMi (3) Equ (7) LMi (6) Pup (4) UMa (47)
Aur (32) Cnc (19) Eri (10) Lyn (18) Sco (5) UMi (5)
Boo (32) Com (13) Gem (39) Lyr (32) Sct (5) Vir (24)
Cam (29) CrB (10) Her (59) Mon (14) Ser (22) Vul (12)
Cap (7) Crv (4) Hya (11) Oph (18) Sex (6)
Cas (49) CVn (15) Lac (13) Ori (54) Sge (10)

1 Ari (**)
Name: 1 Ari, STF174
Type: **
Constellation: Ari
Coordinates: 01h50m08.60s / +22°16'29.50"

Components:
m1 m2 ρ θ Year
6m.3 7m.2 2.9" 164° 2018
Robert Zebahl
63mm f/13.3, 46x, Bortle 6-, SQM-L 19.0
Clearly split, but tight with noticeable difference in brightness.
70mm f/5.7, 80x
At 67x pretty tight pair, but separated with a clear difference in brightness. The primary component appeared in a hint of orange. At 80x easy to separate.
8" f/6, 100x, Bortle 4, NELM 5m.9+, SQM-L 21.0
Conditions in the target region: SQM-L 20.8
Nice double star with big difference in brightness.

30 Ari (**)
Name: 30 Ari
Type: **
Constellation: Ari
Coordinates: 02h37m00.52s / +24°38'50.00"

Components:
m1 m2 ρ θ Year
STFA5 AB 6m.5 7m.0 37.9" 275° 2019
RAO8 BC 7m.0 11m.0 0.6" 282° 2018
Robert Zebahl
B 8x44
AB: 2020-11-25: Easy to split at still quite small separation and visible difference in brightness. The primary component appeared white-yellowish, the companion darker.
B 12x42, Bortle 4-, SQM-L 20.8
AB: 2022-10-19: Easy to split at moderate separation and small difference in brightness. Well visible color difference, although it is difficult to assign the color to the components: white-bluish & yellow-orange.
70mm f/5.7, 22x
AB: At 22x widely separated, striking with a rather small difference in brightness. A seemed a bit warmer in color compared to B with a hint of orange. At 44x, both seemed slightly orange with very little difference in color.

gamma Ari (**)
Name: gamma Ari, STF180
Type: **
Constellation: Ari
Coordinates: 01h53m31.76s / +19°17'38.60"

Components:
m1 m2 ρ θ Year
AB 4m.5 4m.6 7.4" 1° 2020
Robert Zebahl
8" f/6, 80x, Bortle 3-, SQM-L 21.3
Nice, obvious double star. Both components have similar brightness and appeared white.

H 5 12 (**)
Name: H5 12, 9 Ari, lambda Ari
Type: **
Constellation: Ari
Coordinates: 01h57m55.71s / +23°35'45.80"

Components:
m1 m2 ρ θ Year
AB 4m.8 6m.7 37.3" 48° 2020
Robert Zebahl
B 8x44
2020-11-25: Easily separable with noticeable difference in brightness. Primary component appeared slightly yellowish with dim companion.
70mm f/5.7, 15x, Bortle 6-
Easy to split with large distance and difference in brightness.
René Merting
12.5" f/4.5, 45x, SQM-L 21.0
bei 45x ein wunderschönes, sehr helles Farbkontrastpaar, A ist gelb-weiß, B im Nordosten ist gut 1.5 Magnituden schwächer und grau-weiß - Trennung mehr als komfortabel

STF 178 (**)
Name: STF178
Type: **
Constellation: Ari
Coordinates: 01h52m02.54s / +10°48'38.10"

Components:
m1 m2 ρ θ Year
8m.2 8m.2 3.0" 205° 2018
Robert Zebahl
63mm f/13.3, 67x, Bortle 6-, SQM-L 19.0
Clearly split, tight, apparently equally bright components.
70mm f/5.7, 100x, Bortle 7+, SQM-L 18.8
Split with equally bright components.

STF 212 (**)
Name: STF212
Type: **
Constellation: Ari
Coordinates: 02h06m14.96s / +25°06'31.00"

Components:
m1 m2 ρ θ Year
8m.3 8m.7 1.9" 162° 2018
Robert Zebahl
63mm f/13.3, 168x, Bortle 6-, SQM-L 19.0
Not split, but partially seen as an '8'. Overall the double star appeared rather faint and both components seemed to be similarly bright.
70mm f/5.7, 128x, Bortle 7+, SQM-L 18.8
Barely split with slight difference in brightness.

STF 287 (**)
Name: STF287
Type: **
Constellation: Ari
Coordinates: 02h38m59.78s / +14°51'37.60"

Components:
m1 m2 ρ θ Year
7m.4 9m.6 6.8" 74° 2015
René Merting
76mm f/7.5, 57x, SQM-L 18.6
bei 57x zeigt B sich schwach östlich von A, knapp getrennt - Helligkeitsunterschied zwei Größenklassen

STF 291 (**)
Name: STF291
Type: **
Constellation: Ari
Coordinates: 02h41m06.59s / +18°48'00.70"

Components:
m1 m2 ρ θ Year
AB 7m.7 7m.5 3.4" 117° 2020
AC 7m.7 9m.5 65.5" 242° 2015
Robert Zebahl
70mm f/5.7, 57x
AB: At 44x almost, at 57x clearly split, but still very tight with rather small difference in brightness.
René Merting
76mm f/7.5, 95x, SQM-L 18.6
AB: bei 57x zeigt B sich südöstlich von A und klebt noch an diesem, die Trennung gelingt dann äußerst knapp bei 95x
AC: bei 29x zeigt sich C ganz schwach weit abgesetzt südwestlich von A - Helligkeitsunterschied mehr als zwei Größenklassen

STF 305 (**)
Name: STF305
Type: **
Constellation: Ari
Coordinates: 02h47m27.35s / +19°22'20.00"

Components:
m1 m2 ρ θ Year
AB 7m.5 8m.2 3.5" 306° 2020
AC 7m.5 13m.0 95.1" 26° 2015

../images/binary-star-orbits/STF305-AB-orbit.jpg

René Merting
76mm f/7.5, 95x, SQM-L 18.6
AB: bei 95x ist ein äußerst knapp getrenntes Pärchen erkennbar - zwei mittelhelle Sterne, wobei B im Nordosten eine halbe Magnitude schwächer ist

STF 311 (**)
Name: STF311, pi Ari, 42 Ari
Type: **
Constellation: Ari
Coordinates: 02h49m17.55s / +17°27'51.50"

Components:
m1 m2 ρ θ Year
AB 5m.3 8m.0 3.2" 118° 2018
Robert Zebahl
70mm f/5.7, 133x
The companion is visible as elongated, non-condensed brightening in the first diffraction ring of the primary component.
René Merting
76mm f/7.5, 95x, SQM-L 18.6
bei 95x zeigt sich B südöstlich von A, lässt sich allerdings noch nicht ganz trennen - ich habe auch höhere Vergrößerungen probiert, aber dann schlug das Seeing gnadenlos zu und hat keine Trennung zugelassen

STTA 27 (**)
Name: STTA27, VW Ari
Type: **
Constellation: Ari
Coordinates: 02h26m45.64s / +10°33'55.00"

Components:
m1 m2 ρ θ Year
AB 6m.7 8m.3 73.8" 31° 2017
AC 6m.7 11m.8 61.8" 155° 2015
René Merting
76mm f/7.5, 29x, SQM-L 18.6
AB: bei 29x ein Sternpaar mit riesigem Abstand - auf den ersten Blick ein netter Farbkontrast, Komponente B im Norden ist eine Größenklasse schwächer und wirkt graubraun gegen die weiß strahlende A-Komponente