Sh 2-9
| Emission nebula | |
|---|---|
 A photo of Sh2-9 taken by Dean Salman | |
| 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 |
Sh2-9, also called Gum 65 is combination emission and reflection nebula in the Scorpius constellation, surrounding the multiple star system Sigma Scorpii. The nebula is a few arcminutes to the northeast to Messier 4[1][2], and can be easily seen by small telescopes.
Sharpless 9 is a red emission nebula that surrounds the star Sigma Scorpii.[2] It is thought the star Sigma Scorpii, a variable giant star, is ionizing this region.[3] It is also recorded as reflection nebula C130.[4]
This region is noted as both an emission and reflection nebula, although sometimes only one aspect is noted.[5][2]
The magnitude 1.1 Antares is also relatively nearby to this nebula.[2]
The paper A 2.3 GHz radio continuum map of the upper Scorpio region found that one of strongest 2.3 GHz sources in their region of study, which they called Source 4, coincided with Gum 65/Sharpless 9/C140.[4]
There is a radio source on the edge, and it has been proposed this because there is a collision between this nebula and the Dark nebula Kh 527.[4]
Catalogs
Examples:[4]
- Sharpless 9
- Gum 65
- Cederblad 140
References
- ^ "SH2-9". SharplessCatalog.Com. Sharpless Catalog. Retrieved October 11, 2019.
- ^ a b c d Abrams, Bernard; Stecker, Michael (2012-12-06). Structures in Space: Hidden Secrets of the Deep Sky. Springer Science & Business Media. ISBN 9781447104414.
- ^ "The Gum Catalog". galaxymap.org. Retrieved 2019-10-30.
- ^ a b c d E.E. Bart, et al. - A 2.3 GHz radio continuum map of the upper Scorpio region (1980) - Page 161
- ^ Gilmour, Jess K. (2003). The Practical Astronomer's Deep-sky Companion. Springer Science & Business Media. ISBN 9781852334741.
External links
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