Messier 10 or M10 (also designated NGC 6254) is a magnitude 6.4 globular cluster located at an approximate distance of 14,300 light-years in the constellation Ophiuchus.

The object was discovered by Charles Messier on May 29, 1764, who cataloged it as number 10 in his list. He described it as a "nebula without stars", but later study revealed it as a globular cluster of thousands of stars.

http://en.wikipedia.org/wiki/Messier_10

ABOUT THE IMAGE

DATE/TIME:  The evening of June 16th, 2014.

CAMERA:  Canon XSI, 450D modified.

TELESCOPE:  Celestron 235mm SCT @ F/10

ISO SETTING:  800

EXPOSURES:  30

EXPOSURE LENGTH:  300sec.

TOTAL EXPOSURE LENGTH:  2hrs, 30min.

SUBTRACTIONS:  10 darkframes, 20 flat frames and 16 dark-flat frames.

CAPTURE SOFTWARE:  MaximDL

STACKING SOFTWARE:  Deep Sky Stacker

PROCESSING:  Photoshop CS3