Wednesday, May 10, 2017

M1 - The Crab Nebula 25-Jan-2017

Distance 6500 +/- 1600 ly. North is up, east to the left.

Telescope configuration: Celestron EdgeHD 1100 with the Celestron 0.7x focal reducer (fl=1960mm, f/7.0).
Camera: Nikon D5300a (IR-modified). Exposure data: 2 - 8 min. exposures and 5 - 10 min. exposures at ISO800. Ambient temp ~40°f.
Image capture scale: 0.41 arc-seconds/pixel (i.e., un-binned). Field of view (horizontal) = 13.6arc-min. Image capture using TSXPro Camera Add On (Software Bisque).
Mount: Orion HDX110 German equatorial mount. Autoguided with an SBIG Sti autoguider, a Celestron OAG (off-axis guider) (without the Starlight Xpress SXV-AOLF (Adaptive Optics Large Format) device) using PHD2 autoguiding software, not dithered.
Post processing: ImagesPlus 6.5: NEF conversion and calibration, alignment, stacking/combining using 0 dark frames, a 0 bias frame master and 0 flat frames, Min/Max Sigma Clipped Median combined.
Cropped to final dimensions of 2000x2000. No downsizing. Final image scale/resolution 0.41 as/p.

Seeing: FWHM 6.28 pixels, 2.57 arcseconds


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