Ngc 6811 in Cygnus
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2011-10-14
Gahberg observatory, Upper Austria
6” Lichtenknecker Flatfieldcamera Atik 16HR + Baader LRGB-filters
Alt AD6
Luminance 22x5min / RGB 7x5 min each
03h 36min
Open cluster
18’
+6.8 mag
Cygnus
3900 light years
Trumpler classification: IV 3 p
bad transparency, bright moonlight
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