Astronomy:Sh 2-9
| Emission nebula | |
|---|---|
| H II region | |
| File:300px Image of Sh 2-9 with star Sigma Scorpii at the center | |
| Observation data: J2000.0 epoch | |
| Right ascension | 16h 21m 11.31s |
| Declination | -25d 35m 34.05 |
| Distance | 568 ly (174 pc) |
| Apparent magnitude (V) | 2.89 |
| Constellation | Scorpius |
| Designations | Gum 65, LBN 1101, HD 147165, IRAS 16181-2528[1] |
Sh 2-9, also known as Gum 65, is combination emission and reflection nebula in the Scorpius constellation, surrounding the multiple star system Sigma Scorpii. Sigma Scorpii is 1° to the northwest of Messier 4,[2][3] and the nebula can be easily seen with small telescopes.
Sharpless 9 is a red emission nebula that surrounds the star Sigma Scorpii.[3] It is thought the star Sigma Scorpii, a variable giant star, is ionizing this region.[4] It is also recorded as reflection nebula C130.[5]
This region is noted as both an emission and reflection nebula, although sometimes only one aspect is noted.[6][3]
The magnitude 1.1 Antares is 2° to the southeast of this nebula.[3]
One of strongest 2.3 GHz sources in the region coincides with Sharpless 9.[5]
There is a radio source on the edge, and it has been proposed that this is because there is a collision between this nebula and the dark nebula Kh 527.[5]
Catalogs
Examples:[5]
- Sharpless 9
- Gum 65
- Cederblad 140
References
- ↑ "Sh 2-9". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Sh+2-9.
- ↑ "SH2-9". Sharpless Catalog. http://sharplesscatalog.com/sharpless.aspx.
- ↑ 3.0 3.1 3.2 3.3 Abrams, Bernard; Stecker, Michael (2012-12-06) (in en). Structures in Space: Hidden Secrets of the Deep Sky. Springer Science & Business Media. ISBN 9781447104414. https://books.google.com/books?id=tNDvBwAAQBAJ&q=Sharpless+9+nebula&pg=PA82.
- ↑ "Sh 2-9". http://galaxymap.org/cat/view/sharpless/9.
- ↑ 5.0 5.1 5.2 5.3 E. E. Baart (Dec 1980). "A 2.3 GHz radio continuum map of the upper Scorpio region". Astronomy and Astrophysics 92: 156. Bibcode: 1980A&A....92..156B. http://adsabs.harvard.edu/full/1980A%26A....92..156B.
- ↑ Gilmour, Jess K. (2003) (in en). The Practical Astronomer's Deep-sky Companion. Springer Science & Business Media. ISBN 9781852334741. https://books.google.com/books?id=3IpZrC0BeewC&q=%22Sh2-9%22+-wikipedia&pg=PP125.
External links
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