AstroPhotography by Dan Richey


Hercules Globular Cluster
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Hercules Globular Cluster

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M13 was discovered by Edmond Halley in 1714, and catalogued by Charles Messier on June 1, 1764. With an apparent magnitude of 5.8, it is barely visible with the naked eye on a very clear night. Its diameter is about 23 arc minutes and it is readily viewable in small telescopes. Nearby is NGC 6207, a 12th magnitude edge-on galaxy that lies 28 arc minutes directly north east. A small galaxy, IC 4617, lies halfway between NGC 6207 and M13, north-northeast of the large globular cluster's center. M13 is about 145 light-years in diameter, and it is composed of several hundred thousand stars. M13 is 25,100 light-years away from Earth.

Object Information

Name Hercules Globular Cluster
Type Globular Cluster
Constellation Hercules
Catalogue M13 / NGC 6205

Acquisition / Processing

Exposure L - 12 x 120 sec Bin 1
Total 24 Min
Telescope AP 160 @ f7.7
Camera STL-11 / SG4
Mount AP 900GTO
Processing CCDStack / PS CS3
Location San Pedro Ceek, NM
Date May 8, 2011

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