Sh 2-9

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.

Sh 2-9

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

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