M75 also known as Messier 75 or NGC 6854, is a globular cluster which lies approximately 67,500 light-years distant in the constellation Sagittarius.  It was discovered by Pierre Mechain in 1780 and included in Charles Messier's catalog of comet-like objects that same year.

http://en.wikipedia.org/wiki/Messier_75

 

ABOUT THE IMAGE

DATE/TIME:  The evening and early morning of August 1st and 2nd, 2013.

CAMERA:  Canon XSI, 450Da

TELESCOPE:  Celestron C9.25 SCT @ F/6.3

MOUNT:  Celestron CGE Pro

ISO SETTING:  800

EXPOSURES:  31

EXPOSURE LENGTH:  200sec.

TOTAL EXPOSURE LENGTH:  1hrs, 43min, 20sec.

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

CAPTURE SOFTWARE:  MaximDL

STACKING SOFTWARE:  Deep Sky Stacker

PROCESSING:  Photoshop CS3