Here is an image of M3, a Globular Cluster in the constellation Canes Venatici. It is one of the larger clusters in the night sky with about a half a million stars. It is about 39,000 light years from earth and has a luminosity of about 300,000 times that of our Sun.
May 26, 27 and June 5, 2011
Location: Rancho Hidalgo, NM
Telescope: TEC-140 (F7)
Camera: SBIG ST-8300M
Mount: AP900 FTO
Luminance: 22x5 minutes (unbinned)
Red: 11x5 minutes (2x2)
Green: 11x5 minutes (2x2)
Blue: 11x5 minutes (2x2)