Move your mouse over the image to locate Cygnus X-1.

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Emission Nebula Sh2-101
  • Description: Emission Nebula Sh2-101 in Cygnus. Located a couple of degrees SW of the Crescent Nebula. Back in 1962, a strong X-ray source was identified in Cygnus. The star labelled above with the mouseover (9th Mag. HDE 226868) was identified by Tom Bolton, using the 74 inch telescope at the David Dunlop Observatory, as a black hole candidate and the source of the X-ray emissions. Cygnus X-1 is a binary system, with the black hole orbiting HDE 226868. It is believed to be between 7 and 13 solar masses with an orbital period of 5.6 days. More information on Cygnus X-1 can be found here or at Wikipedia. More on Tom Bolton's involvement is available here.
  • Camera: SBIG ST-8XE at -15C
  • Filter: Schuler 10nm Hydrogen Alpha
  • Scope: Takahashi FSQ-106N
  • Exposure: 2 x 30 minutes
  • Location: Mt. Kobau B.C.
  • Date: August 5, 2005