Sh 2-9

Sh2-9
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
See also: Lists of nebulae

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.

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

^ "SH2-9". SharplessCatalog.Com. Sharpless Catalog.
^ ^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. Baart; et al. (Dec 1980). "A 2.3 GHz radio continuum map of the upper Scorpio region". Astronomy and Astrophysics. 92: 156. Bibcode:1980A&A....92..156B.
^ Gilmour, Jess K. (2003). The Practical Astronomer's Deep-sky Companion. Springer Science & Business Media. ISBN 9781852334741.