Celestial hemisphere:  Northern  ·  Constellation: Cygnus (Cyg)  ·  Contains:  Crescent nebula  ·  NGC 6888
The Crescent Nebula, Lee Harris
The Crescent Nebula
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The Crescent Nebula

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)
The Crescent Nebula, Lee Harris
The Crescent Nebula
Powered byPixInsight

The Crescent Nebula

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

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My Second image for September 2019

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The Crescent Nebula

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.

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The Crescent Nebula, Lee Harris