Great Globular Cluster in Hercules
From Free net encyclopedia
The Great Globular Cluster in Hercules (also known as the Hercules Globular Cluster, Messier Object 13, Messier 13, 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 hundred thousand stars from magnitude 11.95 (variable star V11) to down. It is 25,100 light-years away from Earth.
The Arecibo message of 1974 was transmitted toward this globular cluster.
Literary references
- In the science fiction series Perry Rhodan, M13 is the location of Arkon, the home world of the race of Arkonides.
See also
External links
- Messier 13, SEDS Messier pages
- Messier 13, Image by Waid Observatory
- PHOTOMETRIC STUDY OF THE V2 CEPHEID IN M13
- Period, Amplitude and Light Curve of V38 in M13
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