The Crescent Nebula
NGC 6888
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. It was discovered by William Herschel in 1792. It 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-ewithting temperatures.

The nebula is surrounded by lots of dust and gas.

Nominated for Top Pick on Astrobin

Image Details
Date
October 28, 2021
LOCATion
Hannover (Germany)
Sky Quality
Bortle 5
Telescope
Celestron RASA 8 (203/400 f/2)
Mount
Skywatcher EQ6-R Pro
Main Camera
ZWO ASI 2600 MC Pro
Gain 100, Offset 18, -10
Focuser
Celestron Motorfocus
Filter
IDAS NBZ 2'' Dualbandfilter
Exposure
40 x 240' (2h 40')
Guiding
ZWO ASI 462MC, PHD2
Calibration
Flats, Darks, Darkflats
Software
N.I.N.A., EQMod
Other
Artesky Filterholder
Processing
Astropixelprocessor, Photoshop, Pixinsight
  
Gallery
view image
Nebula
view image
Nebula
view image
Nebula
view image
Nebula
view image
Comet
view image
Nebula
view image
Nebula
view image
Nebula
view image
Galaxy
view image
Nebula
view image
Nebula
view image
Nebula
view image
Nebula
view image
Nebula
view image
Nebula
view image
Nebula
view image
Nebula
view image
Nebula
view image
Nebula
view image
Nebula
view image
Galaxy
view image
Nebula
view image
Nebula
view image
Nebula
view image
Nebula
view image
Cluster
view image
Cluster
view image
Galaxy
view image
Galaxy
view image
Nebula
view image
Galaxy
view image
Nebula
view image
Nebula
view image
Galaxy
view image
Nebula
view image
Cluster
view image
Cluster
view image
Cluster
view image
Nebula
view image
Nebula
view image
Galaxy
view image
Cluster
view image
Nebula
view image
Galaxy
view image
Nebula
view image
Nebula
view image
Moon
view image
Moon
view image
Cluster
view image
Cluster
view image
Nebula