m 13

M 13

 

LRGB 93 39 39 39

ASA 16" RC

ASA DDM 85

ASI 6200 Pro

 

Constellation Hercules

Ra 16:41:41

Dec 36:27:40

 

Messier 13 (M 13), also designated NGC 6205 and sometimes called the Great Globular Cluster in Hercules or the Hercules Globular Cluster, is a globular cluster of about 300,000 stars in the constellation of Hercules. 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 west in the picture. A small galaxy, IC 4617, lies halfway between NGC 6207 and M13, north-northwest of the large globular cluster's center.