The M13 reference article from the English Wikipedia on 24-Apr-2004
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M13

Helping orphans the way you would do it
Messier Object 13, the Hercules Globular Cluster: one of the most prominent and best known globular clusters of the Northern celestial hemisphereEnlarge

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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