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William Shaheen | all galleries >> Astronomy - Astronomical objects, images and astronomy related projects >> APOD Submissions > M57 - The Ring Nebula in Lyra 13-Apr-2015
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M57 - The Ring Nebula in Lyra 13-Apr-2015

Distance: ~2300 ly.

Telescope configuration: Celestron EdgeHD 1400 with the Celestron 0.7x focal reducer (fl=2737mm, f/7.7).
Camera: Canon EOS 6D unbinned, IR modified, ambient temperature ~56F. Best 6 of 8 exposures.
1 - 300s @ ISO 800. 2 - 300s @ ISO 400. 3 - 360s @ ISO400.
Image scale: 0.49 arc-sec/pixel (full resolution). Image capture using ImagesPlus 5.75 Camera Control.
Mount: Software Bisque Paramount MX with PEC and ProTrack enabled. Autoguided with an SBIG Sti autoguider, a Celestron OAG (off-axis guider) and a Starlight Xpress AOLF (Adaptive Optics Large Format) device using PHD2 autoguiding software, not dithered.
Post processing: ImagesPlus 6.0: Calibration, alignment, stacking using 0 dark frames, 7 bias frames and 7 flat frames, DDP, sharpening - Multi-Resolution sharpening (wavelets). No noise reduction/smoothing. Curves in Nebulosity3. Cropped in ThumbsPlus7 to 1600x1200 to highlight the nebula.

20150413_M57_CombExcAvg-IPddpmrs-NEBcrv-TPcrp.tif


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