| Emission nebula | |
|---|---|
| reflection nebula | |
 NGC 1931 | |
| Observation data: J2000.0 epoch | |
| Right ascension | 5h 31m [1] |
| Declination | +34° 15′[1] |
| Distance | ~7000 ly |
| Apparent magnitude (V) | 10.1[1] |
| Apparent dimensions (V) | 3′ |
| Constellation | Auriga |
NGC 1931 is an emission and reflection nebula in the constellation Auriga. The nebula has been referred to as a "miniature version of the Orion Nebula", as it shares some of the same characteristics. It is a mixed emission-reflection nebula, and contains a smaller version of the Trapezium in its hot young star cluster centered in the emission nebula. The entire cluster/nebula complex is only about 3 arcmin[2] in size. The distance from earth is estimated at 7000 light years.[3]
The nebula is Sharpless catalog Sh 2-237.
- ^ a b c "NGC 1931". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2008-11-16.
- ^ NGC 1931 @ SEDS NGC objects pages Archived 2008-05-01 at the Wayback Machine
- ^ A.K. Pandey; H.S. Mahra (1986). "Photometry of Open Cluster NGC 1931". Astrophysics and Space Science. 120 (1): 107–113. Bibcode:1986Ap&SS.120..107P. doi:10.1007/BF00653902. S2CID 123187383.