The majority of stars are double or multiple stars. Sometimes two stars appear very closely in the sky, but are only on the same line of sight; their distances differ considerably. These are called OPTICAL DOUBLE STARS.

Real PHYSICAL DOUBLE STARS belong together and are also called BINARIES. They are tied together by gravity and are in mutual orbit.

Source of the above text: The Cambridge Star Atlas by Wil Tirion; ISBN 0 521 80084 6

All my deep sky images can also be viewed as an

Omicron 1 in Cygnus


Omicron 1 in Cygnus.
July 23, 2008 21:41 - 21:55 UT.
Imaging: William Optics Zenithstar 80 ED II APO, f/6.8 [focal length 545 mm], Astronomik LRGB Filters; ATK16IC camera.
Exposures: Lum 5x60s [1x1]; RGB 5x30 [2x2]; all unguided.
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Omicron 1 Cygnus: a nice double in blue and gold
August 18, 2005 21:37 UT.
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Cygnus 61


Cygnus 61
July 15, 2008 23:27 - 23:48 UT
Imaging: William Optics Zenithstar 80 ED II APO, f/6.8 [focal length 545 mm], Astronomik LRGB Filters; ATK16IC camera.
Exposures: Lum 5x60s [1x1]; RGB 5x30 [2x2]; all unguided.
Interesting information about Cygnus 61 here.
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Cygnus 61
September 13, 2003 22:30 - 22:37 UT.
Interesting information about Cygnus 61 here.
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Albireo - Beta Cygnus


Albireo - Beta Cygnus
July 15, 2008 22:51 - 23:14 UT.
Imaging: William Optics Zenithstar 80 ED II APO, f/6.8 [focal length 545 mm], Astronomik LRGB Filters; ATK16IC camera.
Exposures: Lum 5x120s [1x1]; RGB 5x60 [1x1]; all unguided.
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Beta Cygnus: the beautiful Albireo
June 29, 2006 21:43 UT.
Magnitudes 3.07 and 5.11. Separation 34.4 arc seconds.
Imaged with LX200 10-inch f/10 telescope [focal length 2500mm].
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Beta Cygnus: the beautiful Albireo
August 30, 2004 21:19 UT.
Magnitudes 3.07 and 5.11. Separation 34.4 arc seconds.
Imaging: TAL-2M 6 inch f/8, Nikon Coolpix 995 with DCL-28 adapter, one exposure of 15 seconds.
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My best Albireo so far [left image]
August 8, 2003 21:03 - 21:13 UT [prime focus, left image] and 20:43 - 2049 [focal reducer, right image].
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Beta Cygnus: the beautiful Albireo: gold and blue
July 11, 2003 21:51 - 22:41 UT.
Collage of 4 different focal length images.
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Beta Cygnus: the beautiful Albireo
August 14, 2002 21:27 UT. Beta Cygnus: the beautiful Albireo. RA 19:30.7 DEC +27 58; magnitudes [TYC 2133-2964-1] 3.07 and [TYC 2133-2963-1] 5.11. I really wanted to improve yesterdays image: the colours must be better! And I think indeed I improved.
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Beta Cygnus: the beautiful Albireo
August 13, 2002 20:47 UT. Beta Cygnus: the beautiful Albireo. Magnitudes 3.07 and 5.11. Separation 34.4 arc seconds. My first attempt since October 15, 2001. The brightest component [the 3.07] is yellow, while the other component is blue. I have tried to capture these colours.
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Beta Cygnus: the beautiful Albireo
On October 15, 2001 I captured my first real image: the nice double star Albireo, which I had admired visually for many nights already.
The stars have beautiful colours: orange and blue/white. I used my QCVC camera, prime focus, with my experimental low profile eye piece holder.
In the beginning of my imaging I often forgot to note the imaging details ...
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Epsilon Lyrae: the famous Double-Double


Epsilon Lyrae: the famous Double-Double
July 20, 2007 22:41 UT.
Imaged with LX200 10-inch f/10 telescope [focal length 2500mm], standard unmodified Philips ToUcam webcam.
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Epsilon Lyrae: the famous Double-Double
August 2, 2005 21:11 UT.
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Three nice pairs of double stars in Cygnus


Three nice pairs of double stars in Cygnus
July 18, 2007.
Imaged with LX200 10-inch f/10 telescope [focal length 2500mm], standard unmodified Philips ToUcam webcam.
Each object was imaged during 120 seconds at 15 fps.
Because of the high turbulence only a few frames per AVI were acceptable, so I handpicked the best frame of each AVI.
No further post processing: you see the stars as imaged.
Seeing: 4/10, transparency 6-7/10.
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Rigel [Beta Orionis] with companion


Rigel [Beta Orionis] with companion
March 1, 2006 18:38 UT.
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Mizar and Alcor


Mizar and Alcor
April 15, 2004 22:12 - 22:19 UT.
It is interesting to see that Mizar - the brightest of the pair - is a double star itself [Mizar A and Mizar B], which is revealed by the twin horizontal diffraction spikes.
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Gamma Delphinus


Gamma Delphinus
August 9, 2003 21:42 - 21:45 UT.
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Cor Caroli


Cor Caroli
March 16, 2009 21:03 - 21:05 UT.
Imaging: LX200 10 inch f/10 telescope [focal length 2500mm].
Standard ToUcam Pro webcam in normal mode @ 10 fps during 3 minutes giving 180 frames, Baader IRB filter.
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Cor Caroli
March 6, 2009 21:13 - 22:22 UT.
Imaging: LX200 10 inch f/10 telescope with Meade 3.3 Focal Reducer operating at f/4 [focal length 1015mm], ATK16IC camera, Astronomik LRGB filters.
Exposures: Lum 18x10s [1x1]; RGB 8x5s [2x2]; all unguided.
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Cor Caroli
April 18, 2003 23:19 UT.
Cor Caroli, the Alpha star of Canis Venatici.
This early image is waiting to be replaced with a better one :o)
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Regulus


Regulus
April 3, 2003 21:29 UT. Regulus, the Alpha star of Leo, RA 10:08.4 DEC +11:58 ; magnitudes 1.4 and 7.7 Separation 176.9 arc seconds.
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Mintaka


Mintaka with companion
February 3, 2003 19:59 UT.
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Enif: Epsilon Pegaus


Enif: Epsilon Pegaus
October 6, 2002 20:13 UT. The double star Enif: Epsilon Pegasus; RA 21:44 11.11 DEC +09 30
The magnitude information (just move your mouse over the image and maybe wait a few seconds to allow loading) is derived from the USNO-SA2.0 catalog.
Separation: 142 arc seconds.

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Algieba - Gamma Leo


Algieba
April 3, 2002 20:11 UT. Star name Algieba, meaning: the mane of the lion. Leo Gamma RA 10:20.0.6 DEC +19 49; magnitudes [TYC 1423-1349-1] 2.24 and [TYC 1423-1349-2] 3.64. Separation 4.4 arc seconds. Distance: 126 +/- 4 light years.
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Leo 54


Leo 54
April 1, 2002 21:21 UT. Leo 54 RA 10:55.6 DEC +24 45; magnitudes [TYC 1978-2295-1] 4.5 and [TYC 1978-2296-1] 6.3. Separation 6.5 arc seconds. Distance: 289 +/- 19 light years.
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