AstroPhotography by Dan Richey

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M13, the Hercules Globular Cluster, 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, the brightest of which is the variable star V11 with an apparent magnitude of 11.95. M13 is 25,100 light-years away from Earth.

Object Information

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

Acquisition / Processing

Exposure L - 30 x 240 sec Bin1
RG - 15 x 240 sec each Bin 2
B - 15 x 300 sec Bin 2
Total 5.25 Hr
Telescope AP 160 @ f7.7
Camera SBIG STF-8300
Camera Temp -6ÂșC
Guiding SBIG SG4 / Tak 90
Mount AP 900GTO
Filters Astrodon-Gen 2 LRGB
Processing CCDStack
Location San Pedro Creek, NM
Date June 9,10 & 11, 2012

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