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William Shaheen | all galleries >> Astronomy - Astronomical objects, images and astronomy related projects >> Astro Images by Subject > Markarian's Chain - 05 and 06-Apr-2010
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Markarian's Chain - 05 and 06-Apr-2010

Notably, galaxies NGC4438 and NGC4435 (The Eyes) and M86. 14 - 15 min. frames with the SBIG ST-8300M (monochrome) CCD camera at -20C. No filter. Telescope configuration: TEC-140 (980mm, f/7) with the AP 27TVPH .75x focal reducer, yielding 806mm, f/5.76 and an image scale of 1.38 arc-seconds/pixel. Mount: Losmandy G11 w/Gemini. Focused using a Bahtinov focus mask. Post processing: bad pixel removal in Nebulosity2 using 20 dark frames (threshold 5240); calibrated using 16 bias frames, aligned, Min/Mix excl avg combined and DDP applied in ImagesPlus 3.82 (Auto Image Set Processing). Curves in Nebulosity2. Image cropped from original of 3352 x 2532 to 2500 x 2000. Adaptive Richardson-Lucy deconvolution in ImagesPlus (7x7 10 passes).

20100407_NGC4438-CombExcAvg-ddpcrvadjcrparl.jpg


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