Albireo Double Star

clic for 36% size 1428 x 954 (224 kB)

Clic here for 60% size 2380x1560 (415 kB)


About this Image

Albireo (Beta Cygni) is the fifth brightest star in the constellation Cygnus at approximately 380 light-years away from the Earth.
When viewed with the naked eye, Albireo appears to be a single star. However, when viewed with a telescope it readily resolves into a double star, consisting of Albireo A (yellow, apparent magnitude 3.1), and Albireo B (blue, apparent magnitude 5.1.)

Separated by 35 seconds of arc, the two components provide one of the best contrasting double stars in the sky due to their distinct different colors.
North is up;

Technical Details


16" cassegrain in secondary focus at f/10

Mount MK-100 GEM
Camera SBIG STL-11000M at -20C, internal filter wheel,
Filters Baader LRGB
Date Oct 27, 2009.
Location Wildon/Austria
Sky Conditions mag 5.5 sky
Exposure L:R:G:B = 10:10:10:10 minutes (5-minute sub-exposures).
Programs used Maxim DL 4.56
Photoshop CS3;