Sh 2-43
Emission nebula
From Wikipedia, the free encyclopedia
Sh 2-43 also known as RCW 156, is an emission nebula located in the constellation of Sagittarius. It is a faint, diffuse region of ionized hydrogen gas, potentially representing a localized concentration within a broader area of interstellar emission. It lies in a relatively empty patch of sky, bordered by several OB associations including Sgr OB1, Sgr OB7, and Sct OB3.[3][2][4]
| Nebula | |
|---|---|
| Observation data: epoch | |
| Right ascension | 18h 16m 24.00s |
| Declination | −17° 30′ 60.0″[1] |
| Distance | 5,200 ly (1,600[2] pc) |
| Constellation | Sagittarius |
| Designations | Sh 2-43, RCW 156[1] |
Charecterstics
The nebula includes a slightly brighter core region designated as RCW 156a[5] and is associated with the star forming region SFR 13.62-0.76,[6][7] which encompasses infrared sources, molecular clouds, and the radio H II region [CH87] 013.839-0.763.[8] It is also spatially aligned with the suspected supernova remnant GAL 013.1-00.5.[9][2]
Nearby bright star HD 167720, a K2 III giant star is visible near the nebula, though it is not responsible for ionizing the nebula.[10][2][11]
