Object: Ring Nebula M57
Date: 17.06.09
Location: Oberes Schlierental 1450m ü. M.
SQM: 21.30m/s2 at 23:55UTC by 15°C
Telescope: Astrooptik Keller Cassegrain 400mm f/9
Mount: ALT-7
Autoguiding: Second chip in SBIG STL-11000M
Camera: SBIG STL-11000M
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