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Ptolemy's Cluster (M7) Photographed by Scott Davis on July 8, 2013 From Golden State Star Party   Description: Ptolemy's Cluster, catalogued as M7 and NGC6475, is a bright open cluster in the constellation Scorpius. It was first documented by Ptolemy in 130AD. It contains approximately 30 member stars and lies as a distance of 980 light years from Earth.   Imaging Camera: Canon EOS 60D   Imaging Scope/Lens: Orion Astrograph 8" f/3.9 Newtonian   Mount/Tripod: Celestron CGEM (Hypertuned)   Guide Scope/Camera: Orion Astrograph 8" f/3.9 Newtonian   Exposure Details: Camera settings were ISO 1600 with 45-second exposures. A total of 40 light frames, 15 dark frames, and 50 each of flat, dark flat, and bias frames were stacked to create this final image.

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