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Messier 13 (M13), also designated NGC6205 and sometimes called the Great Globular Cluster in Hercules or the Hercules Globular Cluster, is a cluster of about 300,000 stars in the constellation of Hercules. It is about 145 light-years in diameter and is 25,100 light-years away from Earth. It was discovered in 1714 by Edmund Halley.
This is a total of 20 hours of data...... each filter has 30x10 minute exposures which is then stacked and assigned to the relevant channels to make a colour image.
You can see a larger res version on my website
M13 - The Great Globular Cluster in Hercules by Sara Wager, on Flickr
This is a total of 20 hours of data...... each filter has 30x10 minute exposures which is then stacked and assigned to the relevant channels to make a colour image.
You can see a larger res version on my website
M13 - The Great Globular Cluster in Hercules by Sara Wager, on Flickr