M13 - Globular Cluster in Hercules

M13 is best known as the Great Cluster in Hercules. It is one of the brightest of the globular clusters, visible to the naked eye. It lies approximately 25 thousand light years away and is 100 light years in diameter. It was first discovered by Edmund Haley in 1714 and was cataloged by Charles Messier in 1764.

Globular clusters reside in the halo around most galaxies. They contain some of the oldest known stars.

The small spiral galaxy at the lower left is Herschel H701-2.

Telescope: Explore Scientific ED152
Camera: Modified Canon 650D
Mount:  Losmandy G-11 guided with Komura 300mm lens and Orion SSAG
Exposures: 29 @ 4 min.
Processing:  Images were focused using the camera's live view. Frames were calibrated in Photoshop. They were aligned and combined in ImagesPlus. The composite image was adjusted in Photoshop. Topaz DeNoise was applied.
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