The Coma Cluster (also known as Abell 1656) is a large cluster of galaxies containing more than 1000 galaxies. It's located in and is named for the constellation Coma Berenices and lies a mean distance of 321 million light years from Earth. By studying gravitational anomalies in the Coma Cluster, in 1933 astronomer Fritz Zwicky proposed that galaxies are bound by an unexplained mass he termed dark matter.

Technical Information       
Date:                       April, 2014
Location:                 Green Valley, Arizona
Telescope:              Takahashi FSQ-106EDX
Camera:                  SBIG STT-8300M
Filters:                     Astrodon Gen 2
Mount:                     AstroPhysics 1200
Exposure:                LRGB = 6:2:2:2 hours, all unbinned
Software:                 Acquisition: Maxim DL 5, TheSkyX, Pinpoint, CCD Commander
                                Processing: CCDStack, PhotoShop CS6 with various plugins

Coma Cluster (Abell 1656)