NGC 2023

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NGC 2023
reflection nebula
emission nebula
Sunset Glow in Orion.jpg
NGC 2023 picture created from multiple images taken with the Wide Field Camera of Hubble’s Advanced Camera for Surveys.
Observation data: J2000 epoch
Right ascension 05h 41m 37.9s[1]
Declination −02° 15′ 52″
Distance 1467.7 ly   (450 pc)
Apparent dimensions (V) 10′x10′
Constellation Orion
Designations NGC 2023, LBN 954, VDB 52, [XT95] 6, GN, RAFGL 806, [NYS99] C-23, IRAS 05391-0217, RX J0541.8-0217, [RK68] 38
See also: Lists of nebulae

The reflection nebula NGC 2023 is in the constellation Orion. It is one of the brightest sources of fluorescent molecular hydrogen, and at 4 light-years wide it is one of the largest in the sky. It is powered by the B star (B1.5) HD 37903, the most luminous member of a cluster of young stellar objects illuminating the front surface of the Lynds 1630 molecular cloud (Barnard 33) in Orion B.

NGC 2023 forms a cavity in the surface of the cloud, some 450 parsecs from Earth. It produces a bright visual reflection nebula and an ultraviolet-excited photodissociation region. It is about a third of a degree from the Horsehead Nebula and is often included (but not indicated) in images of that object.



  1. ^ "SIMBAD query result for NGC 2023". SIMBAD Astronomical Database. Retrieved 25 July 2011. 

External links[edit]

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