[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/42-orionis-wikipedia\/#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/en\/wiki24\/42-orionis-wikipedia\/","headline":"42 Orionis – Wikipedia","name":"42 Orionis – Wikipedia","description":"From Wikipedia, the free encyclopedia Star in the constellation of Orion 42 Orionis Location of 42 Orionis (marked red) Observation","datePublished":"2022-06-15","dateModified":"2022-06-15","author":{"@type":"Person","@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/author\/lordneo\/#Person","name":"lordneo","url":"https:\/\/wiki.edu.vn\/en\/wiki24\/author\/lordneo\/","image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"Enzyklop\u00e4die","logo":{"@type":"ImageObject","@id":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","url":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/b\/bf\/Orion_constellation_map.svg\/280px-Orion_constellation_map.svg.png","url":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/b\/bf\/Orion_constellation_map.svg\/280px-Orion_constellation_map.svg.png","height":"289","width":"280"},"url":"https:\/\/wiki.edu.vn\/en\/wiki24\/42-orionis-wikipedia\/","about":["Wiki"],"wordCount":3327,"articleBody":"From Wikipedia, the free encyclopediaStar in the constellation of Orion42 OrionisLocation of 42 Orionis (marked red)Observation dataEpoch J2000\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Equinox J2000ConstellationOrionRight ascension05h 35m 23.16427s[1]Declination\u22124\u00b0\u00a050\u2032\u00a018.0881\u2033[1]Apparent\u00a0magnitude\u00a0(V)4.59[2]CharacteristicsSpectral\u00a0typeB1V[3]U\u2212B color index-0.94[2]B\u2212V color index-0.19[2]AstrometryRadial velocity (Rv)+28.40[4]\u00a0km\/sProper motion (\u03bc) RA:\u00a0+4.52[1]\u00a0mas\/yr Dec.:\u00a0-7.11[1]\u00a0mas\/yr Parallax (\u03c0)3.69\u00a0\u00b1\u00a01.20\u00a0mas[1]Distanceapprox. 900\u00a0ly (approx. 270\u00a0pc)DetailsMass12.0[5]\u00a0M\u2609Temperature25,400[6]\u00a0KRotational velocity (v\u00a0sin\u00a0i)20[7]\u00a0km\/sOther designations c Orionis, BD-04\u00b01185, CCDM\u00a0J05354-0450AB, GC\u00a06934, HIP\u00a026237, HR\u00a01892, HD\u00a037018, NSV\u00a02318, SAO\u00a0132320, WDS\u00a0J05354-0450AB Database referencesSIMBADdata  42 Ori is the bright star at the centre of NGC 1977.42 Orionis is a class B1V[3] (blue main-sequence) star in the constellation Orion. Its apparent magnitude is 4.59[2] and it is approximately 900 light years away based on parallax.[1]The primary star, Aa, has one spectroscopic companion Ab of magnitude 6.3 and separation 0.16″, and a more distant companion B of 7.5 magnitude at 1.6″ separation.[8][9]c Orionis is surrounded by NGC 1977 one of a smaller fainter group of named nebulae just north of the Orion Nebula. c Ori is the star which excites and illuminates NGC 1977.References[edit]^ a b c d e f Van Leeuwen, F. (2007). “Validation of the new Hipparcos reduction”. Astronomy and Astrophysics. 474 (2): 653\u2013664. arXiv:0708.1752. Bibcode:2007A&A…474..653V. doi:10.1051\/0004-6361:20078357. S2CID\u00a018759600. Vizier catalog entry^ a b c d Ducati, J. R. (2002). “VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson’s 11-color system”. CDS\/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237….0D.^ a b Hoffleit, D.; Warren, W. H. (1995). “VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)”. VizieR On-line Data Catalog: V\/50. Originally Published in: 1964BS….C……0H. 5050. Bibcode:1995yCat.5050….0H.^ Gontcharov, G. A. (2006). “Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system”. Astronomy Letters. 32 (11): 759\u2013771. arXiv:1606.08053. Bibcode:2006AstL…32..759G. doi:10.1134\/S1063773706110065. S2CID\u00a0119231169.^ Tetzlaff, N.; Neuh\u00e4user, R.; Hohle, M. M. (2011). “A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun”. Monthly Notices of the Royal Astronomical Society. 410 (1): 190\u2013200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111\/j.1365-2966.2010.17434.x. S2CID\u00a0118629873. Vizier catalog entry^ Hohle, M.M.; Neuh\u00e4user, R.; Schutz, B.F. (2010). “Masses and luminosities of O- and B-type stars and red supergiants”. Astronomische Nachrichten. 331 (4): 349. arXiv:1003.2335. Bibcode:2010AN….331..349H. doi:10.1002\/asna.200911355. S2CID\u00a0111387483. Vizier catalog entry^ Abt, Helmut A.; Levato, Hugo; Grosso, Monica (2002). “Rotational Velocities of B Stars”. The Astrophysical Journal. 573 (1): 359\u2013365. Bibcode:2002ApJ…573..359A. doi:10.1086\/340590.^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). “The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog”. The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ….122.3466M. doi:10.1086\/323920. Vizier catalog entry^ Tokovinin, Andrei; Mason, Brian D.; Hartkopf, William I.; Mendez, Rene A.; Horch, Elliott P. (2015). “Speckle Interferometry at Soar in 2014”. The Astronomical Journal. 150 (2): 50. arXiv:1506.05718. Bibcode:2015AJ….150…50T. doi:10.1088\/0004-6256\/150\/2\/50. S2CID\u00a030737411.  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