NGC 6888 Crescent Nebula
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NGC 6888 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.
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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.
Personal reflections
| Observation Log Information | |
|---|---|
| Log Index: | 1125 |
| Session: | 285 |
| Date: | 2015-08-22/23 |
| Equipment: | 110mmDoublet EP APO – PF Canon 60D |
| Location: | ABWCO |
Keywords: NGC 6888 Crescent Nebula, 110 Finest NGCs, emission nebula, Cygnus
February 3, 2024
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Roger Nelson
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