Crescent Nebula
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(Redirected from NGC 6888)
| Crescent Nebula | |
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| Observation data: J2000.0 epoch | |
| Type | Emission |
| Right ascension | 20h 12m 7s[1] |
| Declination | +38° 21.3′[1] |
| Distance | 5,000 ly |
| Apparent magnitude (V) | +7.4 |
| Apparent dimensions (V) | 18′ × 12′ |
| Constellation | Cygnus |
| Physical characteristics | |
| Radius | - |
| Absolute magnitude (V) | - |
| Notable features | - |
| Other designations | NGC 6888,[1] Sharpless 105, Caldwell 27 |
| See also: Diffuse nebula, 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. 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 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.
Contents |
[edit] Image Only
- Image by Daniel Lopez large image of whole nebula
[edit] Whole Nebula image with explanation
- APOD (2007-11-11) – NASA Astro Picture of the Day: Image by Franck Bugnet
[edit] Image with explanation of cause of features of image
[edit] Image of detail of Nebula with text
[edit] detail of nebula
B.D.Moore and J.J.Hester-Hubble space telescope retrieved 20/09/2011
[edit] See also
[edit] References
- ^ a b c "SIMBAD Astronomical Database". Results for NGC 6888. http://simbad.u-strasbg.fr/Simbad. Retrieved 2007-04-23.
[edit] External links
- Sharpless Catalog 105
- Crescent Nebula on WikiSky: DSS2, SDSS, GALEX, IRAS, Hydrogen α, X-Ray, Astrophoto, Sky Map, Articles and images
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