Messier 12 or M 12 (also designated NGC 6218) is a globular cluster in the constellation of Ophiuchus. It was discovered by Charles Messier on May 30, 1764.

Located roughly 3° in the sky from the cluster M10, M12 is about 16,000 light-years from Earth and has a spatial diameter of about 75 light-years. The brightest stars of M12 are of 12th magnitude. It is rather loosely packed for a globular and was once thought to be a tightly concentrated open cluster. Thirteen variable stars have been recorded in this cluster.

A study published in 2006 concluded that this cluster has an unusually low number of low mass stars. The authors surmise that they were stripped from the cluster by the gravitational influence of the Milky Way.

http://en.wikipedia.org/wiki/Messier_12

 

ABOUT THE IMAGE

DATE/TIME:  Evening of June 15th, 2014.

CAMERA:  Canon XSI, 450D, modified.

TELESCOPE:  Celestron 235mm SCT @ F/10

ISO SETTING:  800

EXPOSURES:  24

EXPOSURE LENGTH:  300sec

TOTAL EXPOSURE LENGTH:  2hrs.

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

CAPTURE SOFTWARE:  MaximDL

STACKING SOFTWARE:  Deep Sky Stacker.

FINAL PROCESSING:  Photoshop CS3.

 

 

 

ABOUT THE IMAGE

DATE/TIME:  Evening of May 10th, 2010.

CAMERA:  Canon XSI, 450D, modified.

TELESCOPE:  Orion 100ED refractor @ F/18

ISO SETTING:  1600

EXPOSURES:  38

EXPOSURE LENGTH:  200sec

TOTAL EXPOSURE LENGTH:  2hrs, 6min.

SUBTRACTIONS: 20 dark frames and 10 bias frames.

CAPTURE SOFTWARE:  MaximDL

STACKING SOFTWARE:  Deep Sky Stacker.

FINAL PROCESSING:  Photoshop CS3.

 

 

 

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