NGC-6791: A very rich open star cluster located in the constellation of Lyra the Lyre. This cluster is thought to be one of the very oldest open star clusters in our Milky Way galaxy. Based on the heavy metal content of its member stars, over twice that of our own Sun, NGC-6791 is estimated to be over 8 billion years old. Because of its age as well as its density,it is one of the most studied open clusters.
This image, acquired on August 10, 2012, is a 15 minute integration of 60-second 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 ccombined using Maxim DL5 Pro. Post processed using PhotoShop CS2, Gradient XTerminator, StarShrink, Carboni's Astro Tools and NoiseWare.