- Double Stars (Cyg) -

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)

beta Cyg (**)

Name: beta Cyg, 6 Cyg, Albireo, STFA43
Type: **
Constellation: Cyg
Coordinates: 19h30m43.29s / +27°57'34.90"

Components:
m1 m2 ρ θ Year
AB 3.2 4.7 34.7" 55° 2018
B 40mm, 8x, Bortle 5, NELM 5.5
Well split, 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!

BU67 (**)

Name: BU67
Type: **
Constellation: Cyg
Coordinates: 20h50m36.05s / +30°54'45.70"

Components:
m1 m2 ρ θ Year
6.8 9.9 1.5" 310° 2015
152mm f/5.9, 270x, Bortle 6
Not split.

BU167 (**)

Name: BU167
Type: **
Constellation: Cyg
Coordinates: 21h36m13.98s / +30°03'19.50"

Components:
m1 m2 ρ θ Year
6.4 9.9 1.7" 88° 2005
152mm f/5.9, 360x, Bortle 6-
The much fainter component was only occasionally visible as a clear brightening of the first diffraction ring. The diffraction ring itself was only indicated and not visible all around. Difficult.

mu Cyg (**)

Name: mu Cyg, 78 Cyg, STF2822
Type: **
Constellation: Cyg
Coordinates: 21h44m08.57s / +28°44'33.40"

Components:
m1 m2 ρ θ Year
AB 4.8 6.2 1.6" 321° 2018
70mm f/5.7, 128x
At 128x I was able to see this double at least elongated.

8" f/6, 171x, Bortle 5, NELM 5.7, SQM-L 20.6
Quite well split with noticeable fainter component.

STF2486 (**)

Name: STF2486
Type: **
Constellation: Cyg
Coordinates: 19h12m05.03s / +49°51'20.70"

Components:
m1 m2 ρ θ Year
AB 6.5 6.7 7.1" 204° 2018
70mm f/5.7, 22x, Bortle 6-
At 22x barely split with a slight difference in brightness. At 44x the primary looked orange. I could not determine the color of the companion.

STF2496 (**)

Name: STF2496
Type: **
Constellation: Cyg
Coordinates: 19h15m19.18s / +50°04'16.00"

Components:
m1 m2 ρ θ Year
AB 6.5 10.0 2.1" 81° 2015
AC 6.5 11.2 186.1" 242° 2003
152mm f/5.9, 270x, Bortle 6
AB: In steadier moments, the much fainter companion can be seen near the first diffraction ring of the primary component.

STF2578 (**)

Name: STF2578
Type: **
Constellation: Cyg
Coordinates: 19h45m39.65s / +36°05'27.60"

Components:
m1 m2 ρ θ Year
AB 6.4 7.0 14.9" 125° 2018
70mm f/5.7, 22x
At 22x easy with visible brightness and color difference. The slight color difference is even better visible at 44x: A appears white-yellowish, B slightly blueish.

STF2579 (**)

Name: STF2579, delta Cyg, 18 Cyg
Type: **
Constellation: Cyg
Coordinates: 19h44m58.44s / +45°07'50.50"

Components:
m1 m2 ρ θ Year
AB 2.9 6.3 2.7" 217° 2016
70mm f/5.7, 200x, Bortle 6-
At 100x only indicated. At 200x the much fainter companion is visible as a slightly elongated brightening on the first diffraction ring.

STF2605 (**)

Name: STF2605, psi Cyg, 24 Cyg
Type: **
Constellation: Cyg
Coordinates: 19h55m37.82s / +52°26'20.50"

Components:
m1 m2 ρ θ Year
AB 5.0 7.5 2.8" 177° 2014
70mm f/5.7, 100x, Bortle 6-
At 80x difficult. At 100x and 133x the fainter component was clearly visible as small, roundish, partly slightly oval brightening.

STF2671 (**)

Name: STF2671
Type: **
Constellation: Cyg
Coordinates: 20h18m24.76s / +55°23'49.80"

Components:
m1 m2 ρ θ Year
AB 6.0 7.5 3.8" 337° 2016
70mm f/5.7, 57x, Bortle 6-
Pretty tight with a clear difference in brightness. I couldn't see anything conspicuous regarding colors.

STF2789 (**)

Name: STF2789
Type: **
Constellation: Cyg
Coordinates: 21h19m58.84s / +52°58'44.10"

Components:
m1 m2 ρ θ Year
AB 7.7 7.9 6.9" 115° 2018
70mm f/5.7, 44x, Bortle 6-
At 22x almost separated. The double star appeared strikingly orange and forms a conspicuous, nearly isosceles triangle with neighbouring stars. At 44x clearly separated, relatively close together with a small difference in brightness.

../sketches/2019-07-28_stf2789.jpg

STFA50 (**)

Name: STFA50, omicron Cyg, 30 Cyg, 31 Cyg
Type: **
Constellation: Cyg
Coordinates: 20h13m37.90s / +46°44'28.80"

Components:
m1 m2 ρ θ Year
AD 3.9 4.8 336.7" 322° 2016
AC 3.9 7.0 108.6" 173° 2016
naked eye, Bortle 6+, SQM-L 19.4
AD: Well split with noticeable difference in brightness.

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

B 40mm, 8x, Bortle 7, NELM 5.0, SQM-L 18.6
AC: Observation at full moon. Easily split 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
AC: Similar to the observation with binoculars. C-component appeared bluish and gave good contrast to the orange colored 31 Cyg.

102mm f/11, 28x, Bortle 6+, SQM-L 19.4
Bright, wide apart and wonderful contrast in color. A: light yellowish-orange, C: blue, D: light blue.

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

STT386 (**)

Name: STT386
Type: **
Constellation: Cyg
Coordinates: 19h48m16.51s / +37°09'37.50"

Components:
m1 m2 ρ θ Year
8.5 8.6 0.9" 70° 2018
152mm f/5.9, 270x, Bortle 6-
Clearly visible as a double star with touching diffraction disks. Not difficult.

STT403 (**)

Name: STT403
Type: **
Constellation: Cyg
Coordinates: 20h14m21.53s / +42°06'15.60"

Components:
m1 m2 ρ θ Year
AB 7.3 7.6 1.0" 171° 2016
152mm f/5.9, 270x, Bortle 6
At 129x clearly elongated with constriction. At 270x clearly split, but very tight with almost touching diffraction disks. Visible, but very small difference in brightness. Inconspicuous color.

STT410 (**)

Name: STT410
Type: **
Constellation: Cyg
Coordinates: 20h39m33.31s / +40°34'46.80"

Components:
m1 m2 ρ θ Year
AB 6.7 6.8 0.9" 2018
AB-C 6.8 8.7 68.2" 69° 2013
AB-D 6.8 10.0 105.9" 327° 2013
152mm f/5.9, 270x, Bortle 6-
All four components easily visible. The pair AB shows two clear, equally bright, overlapping diffraction disks.

../sketches/2019-09-06_stt410.jpg

STT413 (**)

Name: STT413, 54 Cyg, lambda Cyg
Type: **
Constellation: Cyg
Coordinates: 20h47m24.53s / +36°29'26.70"

Components:
m1 m2 ρ θ Year
AB 4.7 6.3 0.9" 2018
102mm f/11, 280x, Bortle 6, SQM-L 19.4
The diffraction disk of the primary component was slightly elongated towards north. The air here was however a bit too unsteady for an accurate observation.

152mm f/5.9, 300x, Bortle 6, SQM-L 19.3
The fainter component was visible as a permanent brightening of the first diffraction ring.

STT426 (**)

Name: STT426, 60 Cyg
Type: **
Constellation: Cyg
Coordinates: 21h01m10.93s / +46°09'20.80"

Components:
m1 m2 ρ θ Year
5.4 9.5 2.9" 159° 2017
152mm f/5.9, 129x, Bortle 6
Much fainter companion outside of first diffraction ring. Better visible at 270x.

STT437 (**)

Name: STT437
Type: **
Constellation: Cyg
Coordinates: 21h20m50.12s / +32°27'10.20"

Components:
m1 m2 ρ θ Year
AB 7.2 7.4 2.4" 20° 2018
70mm f/5.7, 57x, Bortle 6-
At 57x separated, but close together. Near, slightly brighter star in nice contrast. The double star shows a distinct orange coloration. At 100x small difference in brightness visible.