Object: Ring Nebula M57 Date: 28.07.09 Location: Oberes Schlierental 1450m ü. M. SQM: 21.42m/s2 at 23:15UTC by 11°C Telescope: Astrooptik Keller Cassegrain 400mm f/9 Mount: ALT-7 Autoguiding: Second chip in SBIG STL-11000M Camera: SBIG STL-11000M Filter: Luminance, H-alpha, Red, Green, Blue Dark Frame: -25°C Exposure: 6x600s Luminance, 4x900s H-alpha, every 3x600s RGB, total 210minutes

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