Wednesday, May 10, 2017

NGC891 - Spiral Galaxy in Andromeda 26-Dec-2016

Distance 27.3 ± 1.8 Mly

First light after removing the MoonLite Focuser and restoring the 2inch PreciseParts Adapter.

Telescope configuration: Celestron EdgeHD 1100 with the Celestron 0.7x focal reducer (fl=1960mm, f/7.0).
Camera: Nikon D5300 (unmodified). Exposure data: 6 - 10 min. exposures at ISO800. Ambient temp ~50°f.
Image capture scale: 0.41 (reduced from 0.43 as/p due to replacing the focuser with the Precise Parts adapter) (un-binned). Field of view (horizontal) = 25.5arc-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 Exluded Average combined. Cropped to final dimensions of 3743x2940. No downsizing. Final image scale/resolution 0.41 as/p).


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