Distance 2,220 ly

Star on left is HIP 81848, SAO 65508, mag. 6.86

Telescope configuration: Celestron EdgeHD 1100 with the Celestron 0.7x focal reducer (fl=1960mm, f/7.0).
Camera: Nikon D5300a (IR-modified). Exposure data: 8 - exposures between 30 and 180 sec at ISO800. Ambient temp ~58°f.
Image capture scale: 0.41 arc-seconds/pixel (i.e., un-binned). Field of view (horizontal) = 33.6arc-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, manually 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 Sigma Clipped Average combined.
Cropped to final dimensions. No downsizing. Final image scale/resolution 0.41 as/p.

Seeing: FWHM: 3.60 pixels, 2.95 arcseconds (per TSXPro ImageLink).

20170304_M13_CombSigAvg-IPddpadj-TPadj2.jpg