NGC 2023

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NGC 2023
Reflection nebula
emission nebula
Barnard 33.jpg
NGC 2023 next to the Horsehead nebula
Observation data: J2000 epoch
Right ascension 05h 41m 37.9s[1]
Declination−02° 15′ 52″[1]
Distance1467.7 ly   (450 pc)
Apparent dimensions (V)10'×10'[2]
DesignationsNGC 2023,[2] LBN 954,[1] VDB 52, [XT95] 6, GN, RAFGL 806, [NYS99] C-23, IRAS 05391-0217, RX J0541.8-0217, [RK68] 38
See also: Lists of nebulae

NGC 2023 (also known as LBN 954[1]) is an emission and reflection nebula located in the constellation of Orion. It was discovered by William Herschel on 6 January 1785. Its size in the night sky is 10 × 10 arcminutes.[2] At a distance of 1467 light-years (450 parsecs) from Earth, it is located close to the Orion Nebula.[3][4]

The region emits fluorescent molecular hydrogen emission at near-infrared range.[5] It is four light-years in diameter,[4] making it one of the largest reflection nebulae ever discovered.[citation needed] It is illuminated by the B1.5 star HD 37903, the most luminous member of the stars in the Lynds 1630 molecular cloud.[4]



  1. ^ a b c d "SIMBAD query result for NGC 2023". SIMBAD Astronomical Database. Retrieved 2 August 2016.
  2. ^ a b c d "NGC Objects: NGC 2000 - 2049".
  3. ^ "Sunset glow in Orion". NASA. 25 July 2011.
  4. ^ a b c "Astronomy Photo of the Day (APotD): 11/07/14 — NGC 2023". 7 November 2014. Archived from the original on 2014-11-07. Retrieved 2014-11-07. Cite uses deprecated parameter |dead-url= (help)
  5. ^ Burton, Michael G.; Howe, J. E.; Geballe, T. R.; Brand, P. W. J. L. (1998). "Near-IR Fluorescent Molecular Hydrogen Emission from NGC 2023". Publications of the Astronomical Society of Australia. 15 (2): 194–201. Bibcode:1998PASA...15..194B. doi:10.1071/AS98194.

External links[edit]

Coordinates: Sky map 05h 41m 37.9s, −02° 15′ 52″