- Double Stars (Cas) -

And (43) Cet (1) Del (4) Lib (1) Per (27) UMi (1)
Aql (9) CMa (2) Dra (11) LMi (6) Psc (10) Vir (9)
Ari (8) Cnc (10) Equ (5) Lyn (18) Pup (1) Vul (3)
Aur (28) Com (8) Eri (1) Lyr (11) Ser (3)
Boo (20) CrB (4) Gem (22) Mon (1) Sex (2)
Cam (11) Crv (1) Her (16) Oph (1) Tau (11)
Cas (17) CVn (14) Hya (4) Ori (9) Tri (4)
Cep (13) Cyg (26) Leo (24) Peg (16) UMa (38)

BU 1 (**)
Name: BU1
Type: **
Constellation: Cas
Coordinates: 00h52m49.22s / +56°37'39.50"

Components:
m1 m2 ρ θ Year
AB 8m6 9m3 1.5" 83° 2016
AC 8m6 8m9 3.9" 134° 2017
AD 8m6 9m7 9.0" 194° 2017
AE 8m6 12m1 15.8" 333° 2015
CD 8m9 9m7 7.8" 220° 2016
Robert Zebahl
70mm f/5.7, 57x, Bortle 7
AC: Easy to split with little difference in brightness.
70mm f/5.7, 57x, Bortle 7
AD: Relatively large angular distance with obviously fainter component.

eta Cas (**)
Name: eta Cas, 24 Cas
Type: **
Constellation: Cas
Coordinates: 00h49m06.29s / +57°48'54.70"

Components:
m1 m2 ρ θ Year
STF60 AB 3m5 7m4 13.4" 326° 2019
STF60 AC 3m5 11m4 225.0" 260° 2000
STF60 AD 3m5 12m8 189.4" 354° 2011
STF60 AE 3m5 10m2 75.6" 126° 2015
STF60 AF 3m5 11m5 378.3" 276° 2000
STF60 AG 3m5 9m5 419.7" 259° 2012
STF60 AH 3m5 8m4 701.1" 355° 2012
SMR2 AI 3m5 11m6 90.3" 73° 2012
SMR2 AJ 3m5 12m3 237.1" 262° 2012

../images/binary-star-orbits/STF60-AB-orbit.jpg

Robert Zebahl
70mm f/5.7, 57x
AB: Easy to split with big difference in brightness. Fainter component appeared deep orange to slightly red colored, brighter component tends to be more slightly yellowish.

H 5 82 (**)
Name: H5 82
Type: **
Constellation: Cas
Coordinates: 00h47m24.62s / +51°05'45.90"

Components:
m1 m2 ρ θ Year
AB 8m0 8m3 56.8" 75° 2018
Robert Zebahl
70mm f/5.7, 26x, Bortle 7
Almost equally bright components with large angular distance.

KR 11 (**)
Name: KR11
Type: **
Constellation: Cas
Coordinates: 01h19m40.95s / +61°34'44.40"

Components:
m1 m2 ρ θ Year
9m6 9m7 2.0" 59° 2017
Robert Zebahl
152mm f/5.9, 129x
Rather faint double star. Easily split with equally bright components.

STF 7 (**)
Name: STF7
Type: **
Constellation: Cas
Coordinates: 00h11m38.91s / +55°57'40.90"

Components:
m1 m2 ρ θ Year
8m0 8m5 1.3" 210° 2017
Robert Zebahl
152mm f/5.9, 210x
Clearly separated with rather close components. Slightly unequal. Pretty double.

STF 48 (**)
Name: STF48
Type: **
Constellation: Cas
Coordinates: 00h42m40.01s / +71°21'57.30"

Components:
m1 m2 ρ θ Year
AB 7m8 8m1 5.5" 334° 2016
Robert Zebahl
70mm f/5.7, 57x, Bortle 6-
At 22x almost split, clearly elongated, notched. At 31x split, but very close together, almost equally bright. At 57x easily separable with very small difference in brightness. The fainter companion appeared slightly orange.

STF 59 (**)
Name: STF59
Type: **
Constellation: Cas
Coordinates: 00h47m59.03s / +51°26'41.20"

Components:
m1 m2 ρ θ Year
AB 7m2 8m1 2.4" 151° 2018
Robert Zebahl
70mm f/5.7, 100x, Bortle 7
At 57x elongated, at 100x barely, at 128x clearly split with noticeable difference in brightness.

STF 65 (**)
Name: STF65
Type: **
Constellation: Cas
Coordinates: 00h52m45.61s / +68°51'59.30"

Components:
m1 m2 ρ θ Year
8m0 8m0 3.2" 220° 2017
Robert Zebahl
70mm f/5.7, 57x, Bortle 7
Clearly split with equally bright components.

STF 105 (**)
Name: STF105
Type: **
Constellation: Cas
Coordinates: 01h18m57.50s / +66°09'28.00"

Components:
m1 m2 ρ θ Year
AB 8m8 9m8 3.0" 185° 2016
Robert Zebahl
70mm f/5.7, 100x, Bortle 7
Clearly split with visible difference in brightness.

STF 163 (**)
Name: STF163
Type: **
Constellation: Cas
Coordinates: 01h51m16.93s / +64°51'17.90"

Components:
m1 m2 ρ θ Year
AB 6m8 9m1 34.5" 38° 2018
Robert Zebahl
70mm f/5.7, 20x, Bortle 7+, SQM-L 18.8
Easily split at 20x. From 44x the brighter component was orange colored, the fainter one tends to be more bluish.

STF 170 (**)
Name: STF170
Type: **
Constellation: Cas
Coordinates: 01h55m27.35s / +76°13'28.40"

Components:
m1 m2 ρ θ Year
7m5 8m2 3.2" 244° 2016
Robert Zebahl
70mm f/5.7, 57x, Bortle 7
At 57x barely split with noticeable difference in brightness. At 128x easy split.

STF 182 (**)
Name: STF182
Type: **
Constellation: Cas
Coordinates: 01h56m23.56s / +61°16'52.00"

Components:
m1 m2 ρ θ Year
AB 8m3 8m3 3.6" 125° 2016
Robert Zebahl
70mm f/5.7, 57x, Bortle 7
At 44x almost split. At 57x equally bright components visible.

STF 262 & CHR 6 (**)
Name: STF262 & CHR6, iota Cas
Type: **
Constellation: Cas
Coordinates: 02h29m03.96s / +67°24'08.70"

Components:
m1 m2 ρ θ Year
CHR6 Aa-Ab 4m6 8m5 0.6" 42° 2010
STF262 AB 4m6 6m9 2.9" 230° 2017
STF262 AC 4m6 9m1 6.7" 117° 2015
STF262 AD 4m6 8m5 210.9" 60° 2016

../images/binary-star-orbits/CHR6-Aa-Ab-orbit.jpg ../images/binary-star-orbits/STF262-AB-orbit.jpg

Robert Zebahl
55mm f/9.1, 27x, Bortle 7
Only the D component was well visible. The components B & C were not visible even at magnifications up to 167x. The sky was clearly brightened (Bortle 7).
70mm f/5.7, 120x, Bortle 6-
Components A, B and C pretty close together, D far apart. Component B appeared slightly elongated on the first diffraction ring of the primary component. Rewarding!

../sketches/2019-08-25_iota_cas.jpg

152mm f/5.9, 129x
Component D easy to see even at lowest magnification. Component C is also easily visible at 49x. At 69x the component B is indicated, at 100x clearly visible. C appears slightly grey-bluish and obviously fainter than B. Grand sight at 129x!

STF 3049 (**)
Name: STF3049, sigma Cas, 8 Cas
Type: **
Constellation: Cas
Coordinates: 23h59m00.53s / +55°45'17.80"

Components:
m1 m2 ρ θ Year
AB 5m0 7m2 3.1" 326° 2017
AC 5m0 10m4 106.0" 66° 2014
Robert Zebahl
70mm f/5.7, 120x, Bortle 6-
AB: At 57x barely separated, where the B component appears as a faint tiny star. At 120x the B component is clearly visible and slightly elongated on the first diffraction ring of the primary component. Very fine.

../sketches/2019-08-25_sigma_cas.jpg

STF 3053 (**)
Name: STF3053
Type: **
Constellation: Cas
Coordinates: 00h02m36.08s / +66°05'56.30"

Components:
m1 m2 ρ θ Year
AB 6m0 7m2 15.0" 70° 2018
Robert Zebahl
63mm f/13.3, 46x
Easy to split with noticeable difference in brightness. Brighter component appeared slightly orange, fainter one bluish.

STF 3062 (**)
Name: STF3062, V640 Cas
Type: **
Constellation: Cas
Coordinates: 00h06m15.81s / +58°26'12.50"

Components:
m1 m2 ρ θ Year
6m4 7m3 1.5" 3° 2018

../images/binary-star-orbits/STF3062-orbit.jpg

Robert Zebahl
152mm f/5.9, 129x
Nice view, clearly split, but tight with visible difference in brightness.

STTA 254 (**)
Name: STTA254, WZ Cas
Type: **
Constellation: Cas
Coordinates: 00h01m15.85s / +60°21'19.00"

Components:
m1 m2 ρ θ Year
AB 7m4 8m3 57.8" 89° 2018
AC 7m4 9m6 155.4" 324° 2015
AD 7m4 10m3 181.4" 118° 2016
Robert Zebahl
B 16x70, Bortle 6, SQM-L 19.2
AB: 2020-08-19: Intense orange & bluish. Very striking.
80mm f/6.25, 33x, Bortle 8, NELM 4m3+, SQM-L 18.9
AB: Nice double star. Brighter component appeared orange, the fainter more bluish.
102mm f/11, 28x, Bortle 6+, SQM-L 19.4
AB: Splendid view. Primary component clearly orange, secondary blue.

../sketches/2019-08-22_wz_cas.jpg