Distance 1.04kly

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 at IS800. Ambient temp ~53°f.
Image capture scale: 0.41 arc-seconds/pixel (i.e., un-binned). Field of view (horizontal) = 41.07arc-min. Image capture using TSXPro Camera Add On (Software Bisque) via BackyardNikon.
Mount: Orion HDX110 German equatorial mount. Autoguided with a QHY5L-II monochrome planetary & autoguider camera, 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, average combined and finished with a one pass unsharp filter in ThumbsPlus 10.

No downsizing. Final image scale/resolution 0.41 as/p.

Seeing: FWHM: 3.93 pixels, 3.22 arcseconds (per TSXPro ImageLink).

20170421_NGC6633_CombAvg-IPddp-TPadj.jpg