Messier 22 (also known as M22 or NGC 6656) is an elliptical globular cluster in the constellation Sagittarius. It is one of the brightest globulars that is visible in the night sky.

M22 was one of the first globulars to be discovered in 1665 by Abraham Ihle and it was included in Charles Messier's catalog of comet-like objects on June 5, 1764.

http://en.wikipedia.org/wiki/Messier_22

 

ABOUT THE IMAGE

DATE/TIME:  Evening of July 14th, 2010.

CAMERA:  Canon XSI, 450DM

TELESCOPE:  Orion 100ED @ F/18

ISO SETTING:  1600

EXPOSURES:  29

EXPOSURE LENGTH:  200sec.

TOTAL EXPOSURE LENGTH:  1hr 36min. 40sec.

SUBTRACTIONS: 2 dark frames and 10 bias frames.

CAPTURE: MaximDL

STACKING/PRE-PROCESSING: Deep Sky Stacker

PROCESSING: Photoshop CS3