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William Shaheen | all galleries >> Astronomy >> Astro Images by Subject > M16 - The Eagle Nebula, in Ha 27-Apr-2011
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M16 - The Eagle Nebula, in Ha 27-Apr-2011

M16 - The Eagle Nebula, in Ha 27-Apr-2011

9 - 600 second exposures with the SBIG ST-8300M (monochrome) CCD camera at -15C. Baader 7nm hydrogen alpha 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: bad pixel removal in Nebulosity2 using a 15 dark frame BPM (threshold 7619), normalized, graded, aligned and min/max excluded 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, 20 passes), 2 passes unsharp mask in ThumbsPlus. Autoguided with a Lodestar autoguider connected to a Stellarvue 50mm finderscope with a Celestron 2x Barlow, autoguided using PHD autoguiding software.




20110427_M16-Ha-f10-2x2-600s_CombExcAvg-ddpcrvarladj.jpg


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