Open Cluster M23
Photographed by Scott Davis on August 10, 2013
From Ahwahnee Hills Observatory
Open Cluster M23, also catalogued as NGC6494, is an open cluster in the constellation Sagittarius. It lies at a distance of approximately 2,150 light years from Earth and contains 150 member stars. It stands out beautifully against the dense star clouds of the Milky Way.
Imaging Camera:
Canon EOS 60D
Imaging Scope/Lens:
Orion Astrograph 8" f/3.9 Newtonian
Celestron CGEM (Hypertuned)
Guide Scope/Camera:
Orion Shorttube 80mm w/ Starshoot Autoguider
Exposure Details:
Camera settings were ISO 800 with 45-second exposures. A total of 32 light frames, 15 dark frames, and 40 each of flat, dark flat, and bias frames were stacked to create this final picture. Total integration time is 24 minutes.

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