M15 - Globular Cluster in Pegasus

M15 was discovered by Jean-Dominique Maraldi in 1746. It is over 33,000 light years away and spans approximately 175 light years. It is one of the densest globular clusters known, having undergone what is known as "core collapse." This is common among older clusters. It also contains a large number of variable stars.
Telescope: Orion 10 in. f/4.7 Newtonian
Camera: Modified Canon T4i (650D); ISO 1600; Raw capture
Mount:  Losmandy G11
Guiding: SSAG on 50mm Lumicon finder scope
Exposures: 20 @ 3minutes
Processing: Images were focused using Live View. They were converted to tiff files in Canon Digital Photo Professional before being aligned and combined in ImagesPlus. The composite was slightly cropped and adjusted in Photoshop. Noise was reduced using Topaz DeNoise.
Note: Taken from my backyard observatory in southeastern Minnesota. Temp:50F
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