Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Crescent nebula  ·  NGC 6888
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Crescent Nebula - DSLR Ha - NGC 6888, Thomas Richter
Crescent Nebula - DSLR Ha - NGC 6888
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Crescent Nebula - DSLR Ha - NGC 6888

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Description

When the Moon is shining, i screw on the Ha filter ;-)

Version B: added 27x300s exposures

Object description (Wikpedia.org):

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. It was discovered by Friedrich Wilhelm 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 [citation needed] 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.

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Crescent Nebula - DSLR Ha - NGC 6888, Thomas Richter