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| Description: HDE 226868 This star is the visual companion of the X-ray source Cygnus X-1. This binary system is located about 8000 ly from Earth and contains a black hole of at least 11 solar masses in orbit with HDE 226868, a B0 blue supergiant star. The photograph was taken with the 200-in. telescope at Palomar Observatory on Palomar Mountain, north of San Diego. The slightly dimmer star above is an optical double that is not part of the binary system. Picture Stats: Views: 517 Filesize: 342.66kB Height: 900 Width: 878 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=18692 |