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Last update: 2017-09-20

VdS FG

- Double Stars -

This is just a small selection of evident, quite recommendable double stars. Some of these I have 'found' during starhopping.

And (2) Boo (1) Com (1) Del (2) Psc (1)
Aql (3) Cas (1) CVn (2) Her (2) Tau (5)
Ari (2) Cep (1) Cyg (3) Oph (1) UMa (1)

1 Ari (**)

Name: 1 Ari, STF174
Type: **
Constellation: Ari
Coordinates: 01h50m08.57s / +22°16'31.21"
Components: v2.8 mag / v6.3 mag / 2.8" / 164.0° / 2011
8" f/6, 100x, Bortle 4, NELM 5.9+, SQM-L 21.0
SQM-L 20.8: Nice double star with big difference in brightness.

15 Aql (**)

Name: 15 Aql, SHJ286
Type: **
Constellation: Aql
Coordinates: 19h04m57.67s / -04°01'53.10"
Components: v5.5 mag / v7.0 mag / 38.2" / 210.0° / 2011
8" f/6, 37x, Bortle 5-, SQM-L 20.4
SQM-L 19.9: Easy to split, evident. Both components appeared slightly orange colored.

24 Com (**)

Name: 24 Com, STF1657
Type: **
Constellation: Com
Coordinates: 12h35m07.76s / +18°22'37.40"
Components: v5.1 mag / v6.3 mag / 20.0" / 273.0° / 2012
8" f/6, 60x, Bortle 4, NELM 6.0, SQM-L 21.0
Well separated with obvious difference in brightness. Fainter component appeared blueish, the brighter one slightly orange.

41 Lyn (**)

Name: 41 Lyn, S598
Type: **
Constellation: UMa
Coordinates: 09h28m39.99s / +45°36'06.50"
Components: AB / v5.5 mag / v7.8 mag / 71.4" / 159.0° / 2010
This star has the designation 41 Lyn but is assigned to UMa. At the time, when Flamsteed numbered the stars, the constellation boundaries were not exactly defined. Another example is 10 UMa, which is located in Lyn today.

B 40mm, 8x, Bortle 7, NELM 5.0, SQM-L 19.2
Fairly well separated with fainter component.

59 And (**)

Name: 59 And, STF222
Type: **
Constellation: And
Coordinates: 02h10m52.83s / +39°02'22.40"
Components: v6.7 mag / v6.0 mag / 16.6" / 36.0° / 2011
120mm f/5, 18x, Bortle 6, SQM-L 19.3
Well separated with noticeable difference in brightness.

8" f/6, 100x, Bortle 4, NELM 6.0, SQM-L 20.9
SQM-L 20.4: Nice and evident double star, easy to separate. About 12 arcminutes NE there is NGC828 (v12.3m),

70 Oph (**)

Name: 70 Oph, P Oph, STF2272
Type: **
Constellation: Oph
Coordinates: 18h05m27.37s / +02°29'59.30"
Components: AB / v4.2 mag / v6.2 mag / 6.2" / 128.0° / 2012
8" f/6, 80x, Bortle 5, SQM-L 20.7
SQM-L 20.1: Well split at 80x. Brighter component appeared white, fainter one slightly orange.

alpha CVn (**)

Name: alpha CVn, 12 CVn, Cor Caroli, STFA1692
Type: **
Constellation: CVn
Coordinates: 12h56m01.67s / +38°19'06.20"
Components: v2.9 mag / v5.5 mag / 19.3" / 228.0° / 2011
4.5" f/8, 28x, Bortle 6, NELM 5.3, SQM-L 19.7
Well separated with big difference in brightness.

beta Cyg (**)

Name: beta Cyg, 6 Cyg, Albireo, STFA43
Type: **
Constellation: Cyg
Coordinates: 19h30m43.29s / +27°57'34.90"
Components: AB / v3.2 mag / v4.7 mag / 35.4" / 55.0° / 2012
B 40mm, 8x, Bortle 5, NELM 5.5
Well separated, but I didn't recognised any color.

80mm f/6.25, 25x
One of the most beautiful double stars in the northern hemisphere. Differences in brightness and color (orange-blue) are brilliant! Even under urban conditions with small aperture an enjoyment!

delta Cep (**)

Name: delta Cep, STFA58
Type: **
Constellation: Cep
Coordinates: 22h29m10.25s / +58°24'54.70"
Components: AC / v4.2 mag / v6.1 mag / 40.9" / 192.0° / 2011
80mm f/6.25, 25x
Obvious difference in brightness and color. Brighter component slightly orange, weaker blueish. Seems to be little brother of Albireo ;)

gamma Ari (**)

Name: gamma Ari, STF180
Type: **
Constellation: Ari
Coordinates: 01h53m31.76s / +19°17'38.60"
Components: v4.5 mag / v4.6 mag / 7.5" / 2.0° / 2012
8" f/6, 80x, Bortle 3-, SQM-L 21.3
Nice, obvious double star. Both components have similar brightness and appeared white.

IC5006 (**)

DSS
© DSS II (red) - 5×5'
Name: IC5006
Type: **
Constellation: Aql
Coordinates: 20h23m47.00s / +06°26'55.00"
Components: v14.5 mag / v15.1 mag / 6.0" / 210.0° / -
8" f/6, 150x, Bortle 4, NELM 5.7+, SQM-L 20.9
NELM 5.4+, SQM-L 20.6: I saw this 'double star' with averted vision just as a faint, stellar brightening.
MODERATE

mu Boo (**)

Name: mu Boo, 51 Boo, STFA28
Type: **
Constellation: Boo
Coordinates: 15h24m29.54s / +37°22'37.10"
Components: AB / v4.3 mag / v7.1 mag / 108.0" / 171.0° / 2012
B 40mm, 8x, Bortle 7, NELM 5.0, SQM-L 19.2
Easily separated with obvious difference in brightness.

NGC6933 (**)

DSS
© DSS II (blue) - 5×5'
Name: NGC6933
Type: **
Constellation: Del
Coordinates: 20h33m38.50s / +07°23'25.00"
Components: v10.8 mag / v12.5 mag / 30.0" / 215.0° / -
I guess it is just an optical double star. At least I could not find any entry in the 'Washington Double Star Catalog' (WDS). Located west of the globular cluster NGC6935 in an angular distance of less than 10 arcminutes.

8" f/6, 80x, Bortle 4, NELM 5.7+, SQM-L 20.9
NELM 5.4+, SQM-L 20.6: Easily split, but rather unspectacular. Just for completeness ;-)
EASY

STF245 (**)

Name: STF245
Type: **
Constellation: And
Coordinates: 02h18m36.27s / +40°16'43.70"
Components: AB / v7.3 mag / v8.0 mag / 11.1" / 293.0° / 2010
120mm f/5, 50x, Bortle 6, SQM-L 19.3
Both components well seen with noticeable difference in brightness.

STF401 (**)

Name: STF401
Type: **
Constellation: Tau
Coordinates: 03h31m20.76s / +27°34'18.50"
Components: AB / v6.6 mag / v6.9 mag / 11.4" / 270.0° / 2010
120mm f/5, 18x, Bortle 6-, NELM 4.8+, SQM-L 19.1
Barely separated at 18x. At 40x difference in brightness is visible. Nice view together with the double star STFA7 located northwest.

STF427 (**)

Name: STF427
Type: **
Constellation: Tau
Coordinates: 03h40m38.77s / +28°46'24.00"
Components: v7.4 mag / v7.8 mag / 7.0" / 208.0° / 2007
120mm f/5, 40x, Bortle 6-, NELM 4.8+, SQM-L 19.1
At 40x barely separated. At 75x easily separated with visible difference in brightness.

STF479 (**)

Name: STF479
Type: **
Constellation: Tau
Coordinates: 04h00m56.81s / +23°12'05.70"
Components: AB / v6.9 mag / v7.8 mag / 7.2" / 127.0° / 2010
8" f/6, 37x, Bortle 4, SQM-L 21.00
Nice, evident double star, easy to split. Slight difference in brightness.

STF742 (**)

Name: STF742
Type: **
Constellation: Tau
Coordinates: 05h36m26.12s / +21°59'35.40"
Located about 0.5 degree east of Messier 1.

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

STF2016 (**)

Name: STF2016
Type: **
Constellation: Her
Coordinates: 16h12m07.05s / +11°54'39.20"
Components: v8.5 mag / v9.6 mag / 7.5" / 148.0° / 2005
Only 11 arcminutes northwestward is the pretty bright planetary nebula IC4593.

120mm f/5, 40x, Bortle 4, SQM-L 21.0
SQM-L 20.6: At 40x separable with obvious difference in brightness. At 75x easily separated.

STF2280 (**)

Name: STF2280
Type: **
Constellation: Her
Coordinates: 18h07m49.56s / +26°06'04.40"
Components: AB / v5.8 mag / v5.8 mag / 14.2" / 183.0° / 2011
120mm f/5, 40x, Bortle 5+, SQM-L 20.8
SQM-L 20.5: Very nice, evident double star with equally bright components.

STF2434 (**)

Name: STF2434
Type: **
Constellation: Aql
Coordinates: 19h02m44.38s / -00°42'40.40"
Components: A-BC / v8.4 mag / v8.9 mag / 27.1" / 90.0° / 2010
120mm f/5, 18x, Bortle 4, SQM-L 21.1
Easily separated with similar brightness.

STF2690 (**)

Name: STF2690
Type: **
Constellation: Del
Coordinates: 20h31m11.94s / +11°15'33.70"
Components: A-BC / v7.1 mag / v7.4 mag / 17.6" / 255.0° / 2011
8" f/6, 37x, Bortle 4, NELM 5.7+, SQM-L 20.9
NELM 5.4+, SQM-L 20.6: Evident double star with almost equally bright components and no noticeable contrast in color.

STFA7 (**)

Name: STFA7
Type: **
Constellation: Tau
Coordinates: 03h31m03.47s / +27°43'53.60"
Components: v7.4 mag / v7.8 mag / 43.9" / 234.0° / 2010
120mm f/5, 18x, Bortle 6-, NELM 4.8+, SQM-L 19.1
Well separable with noticeable difference in brightness. Nice view together with the double star STF401 located southeast.

STFA24 (**)

Name: STFA24
Type: **
Constellation: CVn
Coordinates: 13h10m03.27s / +38°29'55.90"
Components: AB / v6.0 mag / v6.3 mag / 277.5" / 289.9° / 2004
This double star contains of the components 15 and 17 CVn.

B 40mm, 8x, Bortle 7, NELM 5.0, SQM-L 19.2
Both components similar in brightness with large distance.

STFA50 (**)

Name: STFA50
Type: **
Constellation: Cyg
Coordinates: 20h13m37.90s / +46°44'28.80"
Components: AD / v3.9 mag / v4.8 mag / 333.8" / 325.0° / 2008
The two components are 30 and 31 Cyg (omicron 1 Cyg).

B 40mm, 8x, Bortle 6-, NELM 5.0
Wonderful double star for binoculars. Large distance of the components, brighter once (31 Cyg) appeared slightly orange, the fainter (Cyg 30) more blueish.

STFA50 (**)

Name: STFA50
Type: **
Constellation: Cyg
Coordinates: 20h13m37.90s / +46°44'28.80"
Components: AC / v3.9 mag / v7.0 mag / 111.0" / 174.0° / 2011
Brighter component is 31 Cyg (omicron 1 Cyg).

B 40mm, 8x, Bortle 7, NELM 5.0, SQM-L 18.6
Observation at full moon. Easily separated with big difference in brightness. Brighter component slightly orange. C-component rather faint.

80mm f/6.25, 25x, Bortle 7, NELM 5.0, SQM-L 18.6
Similar to the observation with binoculars. C-component appeared blueish and gave good contrast to the orange colored 31 Cyg.

STTA254 (**)

Name: STTA254
Type: **
Constellation: Cas
Coordinates: 00h01m15.85s / +60°21'19.00"
Components: AB / v7.4 mag / v8.3 mag / 57.8" / 89.0° / 2007
80mm f/6.25, 33x, Bortle 8, NELM 4.3+, SQM-L 18.9
Nice double star. Brighter component appeared orange, the fainter more blueish.

zeta Psc (**)

Name: zeta Psc, 86 Psc, STF100
Type: **
Constellation: Psc
Coordinates: 01h13m43.80s / +07°34'31.80"
Components: AB / v5.2 mag / v6.3 mag / 23.7" / 62.0° / 2012
8" f/6, 37x, Bortle 4-, NELM 5.7+, SQM-L 20.8
Visually evident as double star and easy to find. Well separated with slight difference in brightness.