Object: Horse Head Nebula B33 Date: 26.12.08 Location: Oberes Schlierental 1450m ü. M. SQM: 21.41m/s2 at 24:00UTC by -10°C Telescope: Astrooptik Keller Cassegrain 400mm f/9 Mount: ALT-7 Autoguiding: Second chip in SBIG STL-11000M Camera: SBIG STL-11000M Filter: Luminance, Red, Green, Blue Dark Frame: -30°C Exposure: 3x600s Luminance, every 3x600s RGB, total 120minutes

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