M13
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Image:M13.arp.300pix.jpg
Messier Object 13, the Hercules Globular Cluster: one of the most prominent and best known globular clusters of the Northern celestial hemisphere.
Messier Object 13 (also known as the Hercules Globular Cluster, M13, or NGC 6205) is a globular cluster in the Hercules constellation at right ascension 16h 41.7m and declination +36� 28'.
With an apparent magnitude of 5.8, it is barely visible with the naked eye on a very clear night. Its real diameter is about 165 light years, and is composed of several 100,000 stars.
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- Adapted from the Wikipedia article, "M13" http://en.wikipedia.org/wiki/M13, used under the GNU Free Documentation License
