Object: Galaxy M61 Date: 15.04.2007 Location: Oberes Schlierental 1450m ü. M. SQM: 22.08m/s2 at 23.45UTC by 6°C 21.99m/s2 at 22.27UTC by 5°C 21.94m/s2 at 23.03UTC by 4°C Telescope: Meade Schmidt-Newton 254mm f/4 Mount: ALT-7 Autoguiding: SBIG STV Camera: Canon EOS 20Da ISO speed: 1600 Dark Frame: Master-Dark at 5°C Flat Frame: Master-Flat at 0°USZ Exposure: 20 x 5minutes, total 100minutes

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