A galaxy cluster located in Corona Borealis.
Center of image coordinates: RA 16h 18m 01.9", DEC: +35d 01m 03.4" (J2000)
The bright object to the right of center is NGC6109.
See http://www.atlasoftheuniverse.com/superc/cbo.html

Telescope configuration: Celestron EdgeHD 1100 with the Celestron 0.7x focal reducer (fl=1960mm, f/7.0).
Camera: SBIG STF8300M. Exposures: Best 9 of 11 @ 10 min., CCD temp -10c. Ambient temp 12c. Seeing: 2.7 - 2.90 arc-seconds FWHM. SQM (Sky Quality Reading) 21.08.
Image capture scale: 0.56 arc-sec/pixel (un-binned). Field of view (horizontal) = 31.7 arc-min. Image capture using Software Bisque TSX Pro Camera Add On.
Mount: Orion HDX110 German equatorial mount. Autoguided with an SBIG Sti autoguider, a Celestron OAG (off-axis guider) and a Starlight Xpress SXV-AOLF (Adaptive Optics Large Format) device using PHD2 autoguiding software, not dithered.
Post processing: ImagesPlus 6.5: FITS conversion and calibration, alignment, stacking/combining using 0 dark frames, 7 bias frames and 5 flat frames, Min/Max Exluded Average combined. Stretched, DDP and Curves in Nebulosity4. Noise reduction in ImagesPlus (2 passes). No cropping; no downsampling.

20160316_NGC6109_CombExcAvg-NEBddpcrv-IPnr2.jpg