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NGC 6939 in Cepheus



Scope: Megrez II at f/5.5, Location: Laguna Mountains, CA   30 May 2011  Camera: Artemis285

Exposure: 18 x 4 min  (1x1 bin) exposure with UV/IR block, 8 x 2 min (2x2 bin) RGB exposures.

Processing: Images were captured  with Artemis Capture (as FITs).  Aligned/stacked and dark subtracted in Astroart with Sigma Combine.   IR / UV Blocking  filter  and Color channels were scaled and  color balanced in Astroart.  Channels were co-registered in Astroart.   Central gradient removal was performed in Astroart. Luminance channel consisted of the IR/UV blocking filter exposures.  Curves and Levels applied in Photoshop to the Luminance channel to optimize star depth.    Final LRGB combine was done in Photoshop.    Final Image size is approximately 1800 x 1345.

North is up in this image. NGC 6939 is an open cluster located in the constellation of Cepheus. In the night sky, NGC69 39 is about 38.5 arc minutes form the spiral galaxy NGC 6946.  There is a small, faint galaxy to the lower right of the star cluster NGC 6939. That galaxy is cataloged PGC 64824.  NGC 6939's distance from Earth is approximately 4,000 light years.    Horizontal FOV is 70'

Image center is approximately - Equatorial 2000: RA: 20h 31m 24s Dec: +6038'00"



All images and content remain the property of Jim Thommes - copyright 2003 - 2012

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