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NGC 2023

Coordinates:Sky map05h41m37.9s,−02° 15′ 52″
From Wikipedia, the free encyclopedia
NGC 2023
Reflection nebula
emission nebula
NGC 2023 next to theHorsehead nebula
Observation data:J2000epoch
Right ascension05h41m37.9s[1]
Declination−02° 15′ 52″[1]
Distance1,300ly(400pc)[2]ly
Apparent dimensions (V)10'×10'[3]
ConstellationOrion[3]
DesignationsNGC2023,[3]LBN 954, IRAS 05391-0217[1]
See also:Lists of nebulae

NGC 2023is anemissionandreflection nebulain theequatorialconstellationofOrion.It was discovered by theGerman-born astronomerWilliam Herschelon 6 January 1785. This reflection nebula is one of the largest in the sky,[4]with a size of10 × 10 arcminutes.[3]It is located at a distance of 1,300 ly (400 pc) from theSun,and is positioned~15′to the northeast of theHorsehead Nebula.[2]

This star-forming nebula forms part of the Orion Bmolecular cloud,[2]orLynds 1630,and is located in the northern section of this complex. In terms ofstellar density,it is the poorest of the four clusters embedded in the cloud complex, with only 21 embeddedinfraredsources.[5]The reflection nebula is illuminated by theHerbig Ae/Be starHD 37903,which has aspectral classof about B2 Ve.[5]The region around the central star is radiating fluorescentmolecular hydrogen emissionat a near-infraredrange.[6][7]Infrared emission ofpolycyclic aromatic hydrocarbonshas been detected from the nebula'sdust.[8]

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  • NGC 2023 taken with the VLT's FORS.
    NGC 2023 taken with theVLT's FORS.
  • Southern detail of NGC 2023 (HST ACS)
    Southern detail of NGC 2023 (HSTACS)

References

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Wikimedia Commons has media related toNGC 2023.
  1. ^abc"NGC 2023".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2020-08-28.
  2. ^abcLópez-García, M. A.; et al. (February 2013)."A comprehensive study of NGC 2023 with XMM-Newton and Spitzer".Monthly Notices of the Royal Astronomical Society.429(1): 775–791.arXiv:1211.2935.Bibcode:2013MNRAS.429..775L.doi:10.1093/mnras/sts373.
  3. ^abcdSeligman, Courtney."NGC Objects: NGC 2000 - 2049".cseligman.com.Retrieved2020-08-28.
  4. ^"ESO's Very Large Telescope Snaps Beautiful Image of Reflection Nebula".Sci–News.May 14, 2019.Retrieved2020-08-28.
  5. ^abMookerjea, B.; et al. (December 2009). "Young stars and protostellar cores near NGC 2023".Astronomy and Astrophysics.507(3): 1485–1502.arXiv:0909.2614.Bibcode:2009A&A...507.1485M.doi:10.1051/0004-6361/200912550.S2CID10603379.
  6. ^Burton, Michael G.; et al. (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.
  7. ^Rouan, D.; et al. (January 1997)."The power of adaptive optics: a close look at a molecular cloud in NGC 2023".Monthly Notices of the Royal Astronomical Society.284(2): 395–400.Bibcode:1997MNRAS.284..395R.doi:10.1093/mnras/284.2.395.
  8. ^Peeters, Els; et al. (February 2017)."The PAH Emission Characteristics of the Reflection Nebula NGC 2023".The Astrophysical Journal.836(2): 40.arXiv:1701.06585.Bibcode:2017ApJ...836..198P.doi:10.3847/1538-4357/836/2/198.S2CID119211134.198.
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