Sunday, April 17, 2016
Galaxy M66 in Leo 12-Apr-2016
Distance 36 ± 5.0 Mly
Telescope configuration: Celestron EdgeHD 1100 with the Celestron 0.7x focal reducer (fl=1960mm, f/7.0).
Camera: Nikon D5300. Exposures: 4 @ 10 min., Ambient temp 55f.
Image capture scale: 0.41 arc-sec/pixel (un-binned). Field of view (horizontal) = 19.4 arc-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) and a 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 5 bias frame master and 7 flat frames, Min/Max Exluded Average combined. HDR Stretch, Curves and multiple enhancements in ImagesPlus. Cropped to final size. Two passes unsharp mask, downsized 50% in ThumbsPlus. Final image scale/resolution 0.82 as/p).