Object: Ring Nebula Date: 18.08.09 Location: Oberes Schlierental 1450m ü. M. SQM: 21.36m/s2 at 05:15UTC Telescope: Astrooptik Keller Cassegrain 400mm f/9 Mount: ALT-7 Autoguiding: Second chip in SBIG STL-11000M Camera: SBIG STL-11000M Filter: H-alpha Dark Frame: -25°C Exposure: 6x600s + 5x300s Luminance, 6x1800s H-alpha, every 3x600s RGB, total 265minutes |
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