M13: Great Cluster in Hercules

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M13, 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 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.

The Arecibo message of 1974, containing encoded information about the human race, DNA, atomic numbers, Earth’s position, and other information, was beamed towards M13 to allow it to be picked up by potential extraterrestrial civilizations in the cluster. The message will reach the cluster in 25,000 years.

Imaging telescopes or lenses: Sky-Watcher 200/1000 Black Diamond
Imaging cameras: Canon EOS 1100D
Mounts: CGEM
Guiding telescopes or lenses: Lunatico Astronomia EZG-60
Guiding cameras: Lunatico Astronomia QHY5-II
Accessories: Baader MPCC Corrector de Coma
Dates: July 20, 2013, Aug. 23, 2013, Aug. 31, 2013
Frames:
21×120″ ISO800 bin 1×1
8×30″ ISO800 bin 1×1
4×150″ ISO800
19×180″ ISO800
9×300″ ISO800
Integration: 2.6 hours
Darks: ~7
Bias: ~150

Author: Jose Fco. Del Aguila
AstroPhotography of the day by SPONLI 11 May 2014