NGC 6811  -  Hole in a Cluster

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Object data of NGC6811

Object type: open cluster (IV3p)
Size: 13'
Magnitude: 6.8 mag (brightest star: 11mag)
Constellation: Cyg
Distance: 3,900 Ly
Notes: NGC6811 is a loose open star cluster in Cygnus. Because of an unusual distribribution of the stars, NGC6811 is known as 'Hole in a Cluster'.

Exposure data

Date: 2008-09-09
Location: Nussbach / Austria (400m)
Telescope: 12" Newtonian telescope (f=1139mm)
Camera: ST2000XM with CFW8 and SBIG Filters
Binning: L 1x1 / RGB 1x1
Exposure time: L 30x2m / R 6x8m / G 7x4m / B 7x4m
Exposure time total: 2h 44m
Notes: bright moon light during exposure