Ptolemy's Cluster (M7)
Photographed by Scott Davis on July 8, 2013
From Golden State Star Party
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
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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