NGC 6888 - The Crescent Nebula 2014-09-05 NGC 6888 or the Crescent Nebula is an oval shaped emission nebula in the constellation of Cygnus. The total exposure time is 45 minutes with Astrodon 5 nm narrowband filters (H-alpha, S-II and O-III), TS Boren-Simon 8" Powernewt and Atik 460EX CCD. Check out my other photos! ← IC 1396 - The Elephant's Trunk Nebula M51 - The Whirlpool Galaxy →