Sh 2-4
| Emission nebula | |
|---|---|
| H II region | |
As seen by the DESI Legacy Survey | |
| Observation data: epoch | |
| Right ascension | 17h 19m 48.5s |
| Declination | −39° 20′ 19″ |
| Distance | 8,800 ly (2,700 pc) |
| Apparent magnitude (V) | 14.95 |
| Apparent dimensions (V) | 5' |
| Constellation | Scorpius |
| Designations | RCW 121, ESO 333-3, IRAS 17149-3916, Haro 3-6, PN H 2-6 |
Sh 2-4 is an emission nebula in the constellation Scorpius. It is part of the Sharpless Catalog assembled by Stewart Sharpless. It was originally misidentified as a planetary nebula. The incorrect planetary designation PN H 2-6 can still be used as an identifier. It may be associated with the star cluster Havlen-Moffat 1.