Object: Ring Nebula M57 Date: 05.06.2010 Location: Oberes Schlierental 1450m ü. M. SQM: 21.18m/s2 at 06.01.2010/00:45UTC 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: H-alpha, OIII, SII Dark Frame: -20°C Exposure: every 1800s filter H-alpha, OIII, SII

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