NGC 1931

NGC 1931
Nebula and Open Cluster NGC 1931
Observation data: J2000.0 epoch
Type	Emission/Open Cluster
Right ascension	5h 31m[1]
Declination	+34° 15′[1]
Distance	~7000 ly
Apparent magnitude (V)	10.1[1]
Apparent dimensions (V)	3′
Constellation	Auriga
Physical characteristics
See also: Diffuse nebula, Lists of nebulae
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NGC 1931, found in the constellation Auriga 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.

References

1. ^ ^{a b c} "SIMBAD Astronomical Database". Results for NGC 1931. http://simbad.u-strasbg.fr/Simbad. Retrieved 2008-11-16. 
2. ^ NGC 1931 @ SEDS NGC objects pages
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. 

External links

• NGC 1931 @ Wikisky
• NGC 1931 @ SEDS NGC objects pages
• Sharpless 237