Messier 72 (also known as M72 or NGC 6981) is a globular cluster located in the constellation Aquarius.  It was discovered by Pierre Méchain on August 29, 1780. Charles Messier looked for it on the following October 4 and 5, and included it in his catalog. Both decided that it was a faint nebula rather than a cluster.

http://en.wikipedia.org/wiki/Messier_72

 

ABOUT THE IMAGE

DATE/TIME:  The evening of September 25th, 2014.

CAMERA:  Canon XSI, 450Da

TELESCOPE:  Celestron C9.25" SCT @ F/10

MOUNT:  Celestron CGE Pro.

ISO SETTING:  800

EXPOSURES:  23

EXPOSURE LENGTH:  300sec.

TOTAL EXPOSURE LENGTH:  1hrs, 55min.

SUBTRACTIONS:  16 dark-frames, 20 flat-frames and 16 dark-flat frames.

CAPTURE SOFTWARE:  MaximDL

STACKING SOFTWARE:  Deep Sky Stacker

PROCESSING:  Photoshop CS3