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William Shaheen | all galleries >> Astronomy - Astronomical objects, images and astronomy related projects >> Celestron EdgeHD 1100 and the SBIG ST-8300M > M51 - The Whirpool Galaxy 25-Apr-2011
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M51 - The Whirpool Galaxy 25-Apr-2011

3 - 600 second exposures with the SBIG ST-8300M (monochrome) CCD camera at -15C. Baader 2" UV/IR filter. Telescope configuration: EdgeHD 1100 (2800mm, f/10) and no focal reducer, binned 2x2. Image scale of 0.80 arc-seconds/pixel. Mount: Losmandy G11 w/Gemini. Focused using a Bahtinov focus mask. Post processing: dark frame subtraction (15 darks), alignment, average combined in ImagesPlus 4.25, no bias frames and no flat frames; DDP and curves in Nebulosity2. Adaptive Richardson-Lucy Deconvolution in ImagesPlus 4.25 (7x7, 10 passes) and multi-resolution sharpening. Autoguided with a Lodestar autoguider connected to a Stellarvue 50mm finderscope with a Celestron 2x Barlow, autoguided using PHD autoguiding software.

20110425_M51_CombAvg-ddpcrvarlmrs.jpg


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