The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. Captured in my backyard 26/5, 9/6, 25-27/6 2024, 379 frames at 120s for a total integration time of 12h38m. For equipment, see about.
The main feature, the crescent nebula is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000 to 400,000 years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to X-ray-emitting temperatures.
Also in this picture are dark and bright nebulae and the soap bubble nebula also known as PN G075.5+01. It is a planetary nebula in the constellation Cygnus. See photo below.
