Ruud de Vries - Dutch Backyard Astrophotography

Fighting light pollution.....

M13

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. M13 is about 145 light-years in diameter, and it is composed of several hundred thousand stars, the brightest of which is a red giant, the variable star V11, with an apparent visual magnitude of 11.95. M13 is 25,100 light-years away from Earth. Read more.

Name and aliases M 13, NGC 6205
Common names Hercules Globular Cluster
Type Globular Cluster
Coordinates 16:41:41.63 +36:27:40.7
Radial velocity -244.5 km/s
Magnitude 5.8 (V)
Size 20.0 (arcminutes)
Link Simbad
Link HyperLeda

Messier 13

Exposure
100 * 300sec L.