NGC 6811 - open cluster in Cygnus

© Velimir Popov & Emil Ivanov 2016
Size: 2000 px

Discovered by John Herschel in 1829, the open cluster NGC 6811 in the constellation of Cygnus contains approximately 70 stars of uniform brightness and very well detached from the background sky. The cluster spans 15 arc-minutes and its distance is estimated between 3000 and 3900 light-years from Earth. The presence of some red giants and predominance of white hot stars suggests an intermediate age of approximately 700 million years.


Image details:


Center of field RA 19:37:23 (h:m:s)
Center of field DE +46:20:12 (deg:m:s)
Size 1.74 x 1.25 (deg)
Pixel scale: 1.04 (arcsec/pixel)
Orientation: Up is -72.1 degrees E of N
Charts and image details obtained from
Optic(s): ASA 12" Astrograph @ f/3.6 (Newton)
Mount: ASA DDM85 Standard
Camera: SBIG STL 11000 M
Filters: Luminance, Red, Green, Blue, Astronomik filters
Dates/Times: 12 Jul. 2015
Location: IRIDA Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exp. Details: R3x10min, G:3x10min, B:3x10min Bin 1, Total 90 min (1:30 hrs)
More details: Dark and flat frames reduction
Processing: PixInsight / PS
Copyright: Velimir Popov and Emil Ivanov 2016. All Rights Reserved
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