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This image was created by median combining 7 x 30 second images using B, V and R filters taken with a Takahashi Epsilon 250 with SBIG ST-8XE CCD. The image has been cut down to be 20 x 20 arc minutes in size.
M21 (NGC 6531) is an open cluster with a strong concentration of stars toward its centre. M21 is a very young cluster with an estimated age of 4.6 million years and is part of the Sagittarius OB1 stellar association.
Return to Short Projects and Targets of Opportunity
In collaboration with the Remote Astronomical Society Observatory
Martin Nicholson - Daventry, United Kingdom.
This page was last updated on March 30th 2008.