Distance 45Mly/65Mly in the constellation Corvus

Telescope configuration: Celestron EdgeHD 1100 with the Celestron 0.7x focal reducer (fl=1960mm, f/7.0).
Camera: Nikon D5300a (IR-modified). Exposure data: 4 - 10 min. exposures at IS800. Ambient temp ~55°f.
Image capture scale: 0.41 arc-seconds/pixel (i.e., un-binned). Field of view (horizontal) = 20.4 arc-min. Image capture using TSXPro Camera Add On (Software Bisque) via BackyardNikon.
Mount: Orion HDX110 German equatorial mount. Autoguided with an SBIG Sti autoguider, a Celestron OAG (off-axis guider) using PHD2 autoguiding software, not dithered.
Post processing: ImagesPlus 6.5: NEF conversion and calibration, alignment, stacking/combining using 0 dark frames, a 9 bias frame master and 0 flat frames, Min/Max Exluded Average combined.

Cropped to final dimensions and resized to 50pct. Final image scale/resolution 0.82 as/p.

Seeing: FWHM: 4.89 pixels, 4.00 arcseconds (per TSXPro ImageLink).

20170328_NGC4038-39_CombExcAvg-2-IPddp-TPadj2-IPnr.jpg