Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  37 Cyg)  ·  IC 1311  ·  NGC 6910  ·  The star Sadr (γ Cyg
NGC 6888, jprejean
NGC 6888
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NGC 6888

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)
NGC 6888, jprejean
NGC 6888
Powered byPixInsight

NGC 6888

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

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Description

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-emitting temperatures.

Processed from FITs subframes from Telescope Live using PixInsight.

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NGC 6888, jprejean