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,[1][2] and the nebula can be easily seen with small telescopes.
| Emission nebula | |
|---|---|
 A photo of Sh 2-9 and σ Scorpii (to the upper right) and M4 (lower left), 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, LBN 1101, HD 147165, IRAS 16181-2528 |
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 2° to the southeast of this nebula.[2]
One of strongest 2.3 GHz sources in the region coincides with Sharpless 9.[4]
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.[4]
Catalogs
Examples:[4]
- Sharpless 9
- Gum 65
- Cederblad 140
References
External links
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