- Double Stars (Cas) -

And (13) Cep (12) Cyg (18) LMi (4) Per (3) UMi (1)
Aql (9) CMa (1) Del (2) Lyn (9) Psc (1) Vir (6)
Ari (5) Cnc (2) Dra (8) Lyr (8) Ser (3)
Aur (15) Com (1) Eri (1) Mon (1) Sex (1)
Boo (8) CrB (4) Gem (9) Oph (1) Tau (6)
Cam (2) Crv (1) Her (12) Ori (8) Tri (3)
Cas (17) CVn (2) Leo (11) Peg (4) UMa (5)

BU1 (**)

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

Components:
m1 m2 ρ θ Year
AC 8.6 8.9 3.9" 134° 2017
AD 8.6 9.7 9.0" 194° 2017
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 3.5 7.4 13.4" 325° 2016
STF60 AC 3.5 11.4 225.0" 260° 2000
STF60 AD 3.5 12.8 189.4" 354° 2011
STF60 AE 3.5 10.2 75.6" 126° 2015
STF60 AF 3.5 11.5 378.3" 276° 2000
STF60 AG 3.5 9.5 419.7" 259° 2012
STF60 AH 3.5 8.4 701.1" 355° 2012
SMR2 AI 3.5 11.6 90.3" 73° 2012
SMR2 AJ 3.5 12.3 237.1" 262° 2012
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.

H5 82 (**)

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

Components:
m1 m2 ρ θ Year
AB 8.0 8.3 57.2" 75° 2017
70mm f/5.7, 26x, Bortle 7
Almost equally bright components with large angular distance.

KR11 (**)

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

Components:
m1 m2 ρ θ Year
9.6 9.7 2.0" 59° 2017
152mm f/5.9, 129x
Rather faint double star. Easily split with equally bright components.

STF7 (**)

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

Components:
m1 m2 ρ θ Year
8.0 8.5 1.3" 210° 2017
152mm f/5.9, 210x
Clearly separated with rather close components. Slightly unequal. Pretty double.

STF48 (**)

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

Components:
m1 m2 ρ θ Year
AB 7.8 8.1 5.5" 334° 2016
70mm f/5.7, 57x, Bortle 6-
At 22x almost split, clearly elongated with constriction. 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.

STF59 (**)

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

Components:
m1 m2 ρ θ Year
AB 7.2 8.1 2.3" 148° 2016
70mm f/5.7, 100x, Bortle 7
At 57x elongated, at 100x barely, at 128x clearly split with noticeable difference in brightness.

STF65 (**)

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

Components:
m1 m2 ρ θ Year
8.0 8.0 3.2" 220° 2017
70mm f/5.7, 57x, Bortle 7
Clearly split with equally bright components.

STF105 (**)

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

Components:
m1 m2 ρ θ Year
AB 8.8 9.8 3.0" 185° 2016
70mm f/5.7, 100x, Bortle 7
Clearly split with visible difference in brightness.

STF163 (**)

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

Components:
m1 m2 ρ θ Year
AB 6.8 9.1 34.5" 38° 2018
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.

STF170 (**)

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

Components:
m1 m2 ρ θ Year
7.5 8.2 3.2" 244° 2016
70mm f/5.7, 57x, Bortle 7
At 57x barely split with noticeable difference in brightness. At 128x easy split.

STF182 (**)

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

Components:
m1 m2 ρ θ Year
AB 8.3 8.3 3.6" 125° 2016
70mm f/5.7, 57x, Bortle 7
At 44x almost split. At 57x equally bright components visible.

STF262 (**)

Name: STF262, iota Cas
Type: **
Constellation: Cas
Coordinates: 02h29m03.96s / +67°24'08.70"

Components:
m1 m2 ρ θ Year
AB 4.6 6.9 2.7" 227° 2016
AC 4.6 9.1 6.7" 117° 2015
AD 4.6 8.5 210.9" 60° 2016
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 gray-blueish and obviously fainter than B. Grand sight at 129x!

STF3049 (**)

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

Components:
m1 m2 ρ θ Year
AB 5.0 7.2 3.1" 326° 2017
AC 5.0 10.4 106.0" 66° 2014
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

STF3053 (**)

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

Components:
m1 m2 ρ θ Year
AB 6.0 7.2 15.2" 71° 2018
63mm f/13.3, 46x
Easy to split with noticeable difference in brightness. Brighter component appeared slightly orange, fainter one bluish.

STF3062 (**)

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

Components:
m1 m2 ρ θ Year
6.4 7.3 1.5" 2018
152mm f/5.9, 129x
Nice view, clearly split, but tight with visible difference in brightness.

WZ Cas (**)

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

Components:
m1 m2 ρ θ Year
AB 7.4 8.3 58.0" 89° 2017
80mm f/6.25, 33x, Bortle 8, NELM 4.3+, SQM-L 18.9
Nice double star. Brighter component appeared orange, the fainter more bluish.

102mm f/11, 28x, Bortle 6+, SQM-L 19.4
Splendid view. Primary component clearly orange, secondary blue.

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