Distance 2,900 ly

Telescope configuration: Celestron EdgeHD 1100 with the Celestron 0.7x focal reducer (fl=1960mm, f/7.0).
Camera: Nikon D5300a (IR-modified). Exposure data: 7 - 8 min. exposures at ISO800. Ambient temp ~52°f.
Image capture scale: 0.41 arc-seconds/pixel (i.e., un-binned). Field of view (horizontal) = 39.0arc-min (i.e., uncropped). 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 0 bias frame master and 0 flat frames, Min/Max Sigma Clipped Median combined.
No cropping and resized to 50pct. Final image scale/resolution 0.82 as/p.

Seeing: FWHM: 3.71 pixels, 3.03 arcseconds (per TSXPro ImageLink).

20170301_NGC2438_CombSigMed-IPddparl.jpg