M13

M13 (also NGC 6205), is a globular cluster, in the Hercules constellation at Right ascension 16^h 41.7^m 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.

See also:

• Messier 13, SEDS Messier pages