Sh 2-18
Emission nebula
From Wikipedia, the free encyclopedia
Sh 2-18 is an emission nebula in the constellation Sagittarius. It is part of the Sharpless Catalog assembled by Stewart Sharpless. It lies next to Sh 2-19. It contains the infrared cluster [DB2000] 1.[3] The nebula appears to be circular in shape. [4]
| Emission nebula | |
|---|---|
| H II region | |
The location of Sh 2-18 in the sky, (in the open source Stellarium software) | |
| Observation data: J2000 epoch | |
| Right ascension | 17h 48m 48s |
| Declination | −29° 15′ 0″[1] |
| Distance | 4,890 ly |
| Apparent magnitude (V) | 15.51 |
| Apparent dimensions (V) | 4' x 4'[2] |
| Constellation | Sagittarius |
| Physical characteristics | |
| Radius | 6 ly |
| Designations | RCW 139, LBN 1125 |
