Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Crescent nebula  ·  NGC 6888  ·  Sh2-105  ·  The star δSer
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NGC6888, Eric Kallgren
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NGC6888

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NGC6888, Eric Kallgren
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NGC6888

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Description

From Wikipedia, the free encyclopedia

Crescent Nebula

Emission nebula

Distance 5,000 ly

Apparent magnitude (V) +7.4

Apparent dimensions (V) 18′ × 12′

Constellation Cygnus

Designations NGC 6888,[1] Sharpless 105, Caldwell 27

See also: Lists of nebulae

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 Friedrich Wilhelm Herschel in 1792.[2] 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[3] 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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NGC6888, Eric Kallgren

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