Messier 4
Photographed by Scott Davis on May 10, 2013
From Lemoore, CA
Messier 4, also catalogued as NGC 6121, is a beautiful globular cluster located in the constellation Scorpius. It is very easy to find with a telescope, as it lies just over a degree away from Antares, the brightest star in Scorpius. Unlike many other globular clusters, the core is not quite as dense and, thus, in a telescope, may first appear to be an open cluster. It is estimated to be approximately 7,200 light years away, thus making it one of the two closest globular clusters to 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 50-second exposures. 54 of 61 light frames and 15 dark frames were stacked to create this composite image. Image capture was done in Backyard EOS; stacking was done with Deep Sky Stacker. Final processing done in Adobe Photoshop using Scott Rosen's DSLR LLRGB processing method.

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