Globular Cluster M55
Photographed by Scott Davis on August 10, 2013
From Ahwahnee Hills Observatory
Globular Cluster M55, also catalogued as NGC6809, is a globular cluster in the constellation Sagittarius. It lies approximately 17,600 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 Shorttube 80mm w/ Starshoot Autoguider
Exposure Details:
Camera settings were ISO 800 with 45-second exposures. A total of 24 light frames, 15 dark frames, and 40 each of flat, dark flat, and bias frames were stacked to create this image. Total integration time is 18 minutes.

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