NGC 1931

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NGC 1931
Emission nebula
reflection nebula
NGC 1931
Observation data: J2000.0 epoch
Right ascension5h 31m [1]
Declination+34° 15′[1]
Distance~7000 ly
Apparent magnitude (V)10.1[1]
Apparent dimensions (V)3′
See also: Lists of nebulae

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 about 7000 light years.[3]

The nebula is Sharpless catalog Sh 2-237.


  1. ^ a b c "NGC 1931". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2008-11-16.
  2. ^ NGC 1931 @ SEDS NGC objects pages Archived 2008-05-01 at the Wayback Machine
  3. ^ 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.

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