Instrument

12.5" RCOS @  ~f/9 (2880 mm fl) 1.28 arcsec / pixel.  Shown resampled to 2.21 arcsec / pixel.

Mount

Paramount ME

Camera

SBIG STL-11000 w/ internal filter wheel, AstroDon Filters

Acquisition Data

3/15/2009 to 3/24/2009  Chino Valley, AZ

Exposure

Lum    400 min (40 x 10 min, bin 2x2)

RGB    360 min (12 x 10 min each, bin 2x2)

Software

CCDSoft, CCDStack, Photoshop CS w/ the Fits Liberator plugin, Noel Carboni's actions and Russ Croman's Gradient Exterminator

CCDStack to register, normalize, data reject, combine and luminance sharpen.

PhotoShop for the color combine.

Comment

North is ~ to the top, the image is rotated 25 deg's CCW

The Coma Cluster (Abell 1656) is a large cluster of galaxies that contains over 1,000 identified galaxies. Abell 1656 and the Leo Cluster (Abell 1367) are the major components of the Coma Supercluster. At a distance of 320 million light years, the apparent extent of the cluster is three times larger than the Moon, half of which is shown in this image. The central region is dominated by two giant elliptical galaxies... NGC 4874 and 4889.

Notable Object:
QSO [HB89] 1256+280  With a red shift of 2.66, this quasar is at a distance of about 10.3 to 12.3 Billion Light Years, depending on who's redshift calculator you use.