NGC 6811 - Open Cluster in Cygnus

NGC 6811 is a large open cluster located in the constellation of Cygnus. It lies 29-39 thousand light years away and has a diameter of 14-20 light years. Its angular size is 15 arcminutes. This is approximately one-half the size of the full moon. It is sometimes referred to as the Hole in the Cluster due to the apparent absence of stars at its center.

Most of the stars in the cluster are 700,000 to one billion years old. The Kepler space mission detected two planets surrounding stars in this cluster.

NGC 6811 was first observed by John Herschel in 1829 and added to the General Catalogue of Nebulae and Galaxies in 1864.


10 in. TPO R-C @ f/6.2 (using an Astro-Physics CCD telecompressor)

Camera: Modified Canon T4i (650D); ISO 800; Raw capture
Mount:  iOptron CEM 60
Guiding: SSAG Pro on 300mm Komura lens
Exposures: 24 @ 5 min.
Processing: Images were focused using Live View. They were converted to tiff files in Canon Digital Photo Professional before being aligned and combined in ImagesPlus. The composite was adjusted in Photoshop. Noise was reduced using Topaz DeNoise.
Note: Taken from my backyard observatory in southeastern Minnesota on 9/14/15.
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