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.
The nebula is surrounded by lots of dust and gas.
Nominated for 
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Top Pick on AstrobinImage 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 |
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