M13


DETAILS
Exposure: undetermined unguided
Telescope: Meade Newton LXD-75 6" f5
Filter: Astronomik IR cut 1.25"
Mount:  Meade LXD-75 Autostar
Camera: Webcam Philips Toucam Pro II
Date: 8th April 2007
Location: Vilassar de Mar (suburban site)
Comments: My second globular cluster. As the exposures were unguided, the stars are a bit elongated.

M13 is often called the Great Globular Cluster in Hercules or the Hercules Globular Cluster, and is also designated NGC 6205. It is a globular cluster in the constellation Hercules.
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 NGC6207 and M13, north-northeast of the large globular'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 the Earth.



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