Crescent Nebula (NGC 6888, Caldwell 27) in the constellation Cygnus, Bi color image

Crescent Nebula (NGC 6888, Caldwell 27) is an emission nebula in the constellation Cygnus, formed by stellar wind. It is about 5000 light years away from Earth, and consist of hydrogen and sulfur gas. Amateur image is bi-color component of Ha: 43 x 900s and SII: 43 x 900s. Total exposure time: 21h30m.

Image dimensions: 3263 x 2426 pixels