NGC-7789 is a rich open star cluster located in the constellation of Cassiopiea, between the stars Rho and Sigma Cassiopieae. NGC-7789 contains over 1,000 stars. It lies 7600 light years from Earth and is 30 light years in diameter. This cluster was discovered by Caroline Herschel in 1783, and because of this is sometimes called "Caroline's Rose".
This image, acquired on September 15, 2015, is a 30 minute integration of 100 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 combined using Maxim DL5 Pro. Post processed using PhotoShop CS2, Gradient XTerminator, StarShrink, Carboni's Astro Tools and NoiseWare.