| Sh2-9 | |
| Type: | Emission |
| Epoch: | J2000.0 |
| Ra: | 16h 21m 11.31s |
| Dec: | -25d 35m 34.05 |
| Dist Ly: | 568 |
| Dist Pc: | 174 |
| Appmag V: | 2.89 |
| Constellation: | Scorpius |
| Names: | Gum 65, LBN 1101, HD 147165, IRAS 16181-2528 |
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] and the nebula can be easily seen with 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.
This region is noted as both an emission and reflection nebula, although sometimes only one aspect is noted.[4]
The magnitude 1.1 Antares is 2° to the southeast of this nebula.
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.
Examples: