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NGC6811 - Open Cluster in Cygnus



Scope: Megrez II at f/5.8, Location: Laguna Mountains, CA   25 June 2011  Camera: Artemis285

Exposure: 12 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 6811 is an open cluster located in the constellation of Cygnus.  This star cluster is sometimes called the "Hole-in-a-Cluster" likely due to it's unusual distribution of stars.  This image replaces an earlier image posted here.  NGC 6811's distance from Earth is approximately 3,100 light years.    Horizontal FOV is 70'

Image center is approximately - Equatorial 2000: RA: 19h 38m 12s Dec: +4634'00"


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

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