NGC-6939 is an open star cluster located in the constellation of Cepheus, almost on the border with Cygnus.
It lies just over 1/2 degree NW of the face-on spiral galaxy NGC-6946. This is a galactic open star cluster which lies at a distance of 5800 light years from Earth and is approximately 15 light years in diameter. It was discovered by Sir William Herschel in 1798.
This image, acquired on August 12, 2015, is a 1 hour 40 minute integration of 6 minute exposures through the Celestron C-11 at f/2, using the HyperStar III imaging system and the Starlight Express SXVR-H694C color CCD camera, operating at -10 degrees below ambient temperature and binned 1 X 1. Guided, captured and combined using Maxim DL5 Pro. Post processed using PhotoShop CS2, Gradient XTerminator, StarShrink, Carboni's Astro Tools and NoiseWare.