Stephan's Quintet, is a compact grouping of five galaxies located in the constellation Pegasus.  It was discoverd by Edouard Stephan in 1877 at the Marseilles Observatory.  This group of galaxies is the most studied group of all the known compact galaxy groups. These galaxies are of interest because of their ongoing violent collisions, which will more than likely end with the galaxies merging.

http://en.wikipedia.org/wiki/Stephan's_Quintet

.ABOUT THE IMAGE

DATE/TIME:  The evening and early morning of August 19th and 20th, 2012.

CAMERA:  Canon XSI, 450D modified

TELESCOPE:  Celestron C9.25" SCT @ F/12.6

MOUNT:  Celestron CGE Pro.

ISO SETTING:  800

EXPOSURES:  29

EXPOSURE LENGTH:  400sec.

TOTAL EXPOSURE LENGTH:  3hrs 13min 20sec.

SUBTRACTIONS: 17 dark frames and 10 bias frames.

CAPTURE: MaximDL

STACKING/PRE-PROCESSING: Deep Sky Stacker

PROCESSING: Photoshop CS3