M13 (Denis Janky)

M13

M13 The Hercules Cluster

M13 is the most impressive globular cluster in the northern hemisphere, and is a favorite summer sky visual target for telescopes and binoculars. With an apparent visual magnitude of 5.8, it can be glimpsed with the naked eye under a dark, moonless sky. Binoculars and small aperture telescopes reveal M13 as an unresolved fuzzy patch, while larger aperture instruments can resolve many individual stars.

M13 (also designated as NGC6205) was discovered in 1713 by Edmund Halley, who earlier had determined the periodicity of a comet that later was named after him. M13 was catalogued on June 1, 1764 by Charles Messier, a famous astronomer and comet hunter who created a list of objects that resembled comets, but were not, to save time in his comet quests.

M13 is about 145 light-years in diameter and lies about 22,000-25,000 light-years from Earth. Estimates of the number of stars in the cluster vary from at least 100,000 to several hundred thousand stars. Like most globular clusters, M13 lies in the galactic halo – well off the plane of the galaxy. The Milky Way contains over 150 globular clusters and these vast clusters contain mostly ancient stars, although dense clusters such as M13 experience stellar collisions that result in new star formation known as “blue stragglers.

Data for this image were obtained in June of 2022. The seeing conditions varied greatly during the four nights of image capture, with especially poor seeing for the green filter and fairly good seeing for the blue filter. I chose to retain all the frames I shot, and tried to make the most of the data in processing. This is one of the last images I acquired with the venerable - and clearly aged - SBIG STL-11000M camera, which I replaced in late summer of 2022.

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Status	Advanced failed
Started	...
Astrometry.net job	7495920
PixInsight job	UDOJ4K1JRVZI7O5P0LOV812GAKOIYXI0
PixInsight queue size	n/a
PixInsight stage	PLATE_SOLVING_IMAGE

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