M28 (also known as Messier 28 or NGC 6626) is a globular cluster located in the constellation Sagittarius.  It was discovered by Charles Messier July 27th, 1764.

http://en.wikipedia.org/wiki/Messier_28

 

ABOUT THE IMAGE

DATE/TIME:  The evening of July 8th, 2013.

CAMERA:  Canon XSI, 450Da

TELESCOPE:  Celestron C9.25 SCT @ F/6.3

MOUNT:  Celestron CGE Pro

ISO SETTING:  100

EXPOSURES:  41

EXPOSURE LENGTH:  200sec.

TOTAL EXPOSURE LENGTH:  2hrs, 16min, 40sec.

SUBTRACTIONS:  16 darkframes, 40flat frames, 16darkflat frames

CAPTURE SOFTWARE:  MaximDL

STACKING SOFTWARE:  Deep Sky Stacker

PROCESSING:  Photoshop CS3