[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/en\/wiki41\/45-herculis-wikipedia\/#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/en\/wiki41\/45-herculis-wikipedia\/","headline":"45 Herculis – Wikipedia","name":"45 Herculis – Wikipedia","description":"before-content-x4 From Wikipedia, the free encyclopedia after-content-x4 Star in the constellation Hercules 45 Herculis Observation dataEpoch J2000\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Equinox J2000 Constellation Hercules","datePublished":"2014-06-27","dateModified":"2014-06-27","author":{"@type":"Person","@id":"https:\/\/wiki.edu.vn\/en\/wiki41\/author\/lordneo\/#Person","name":"lordneo","url":"https:\/\/wiki.edu.vn\/en\/wiki41\/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:\/\/en.wikipedia.org\/wiki\/Special:CentralAutoLogin\/start?type=1x1","url":"https:\/\/en.wikipedia.org\/wiki\/Special:CentralAutoLogin\/start?type=1x1","height":"1","width":"1"},"url":"https:\/\/wiki.edu.vn\/en\/wiki41\/45-herculis-wikipedia\/","wordCount":4405,"articleBody":"     (adsbygoogle = window.adsbygoogle || []).push({});before-content-x4From Wikipedia, the free encyclopedia       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4Star in the constellation Hercules45 HerculisObservation dataEpoch J2000\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Equinox J2000ConstellationHerculesRight ascension16h 47m 46.41942s[2]Declination+05\u00b0\u00a014\u2032\u00a048.2789\u2033[2]Apparent\u00a0magnitude\u00a0(V)5.22[3]CharacteristicsSpectral\u00a0typeA1 Vp Si[4] or B9p Cr[5]U\u2212B color index+0.005[6]B\u2212V color index\u22120.025[6]Variable\u00a0type\u03b12 CVn[7]AstrometryRadial velocity (Rv)\u221216.1\u00b12[8]\u00a0km\/sProper motion (\u03bc) RA:\u00a0\u221218.802[2]\u00a0mas\/yr Dec.:\u00a0\u221238.735[2]\u00a0mas\/yr Parallax (\u03c0)8.1955\u00a0\u00b1\u00a00.2169\u00a0mas[2]Distance400 \u00b1 10\u00a0ly (122 \u00b1 3\u00a0pc)Absolute\u00a0magnitude\u00a0(MV)\u22120.18[9]DetailsMass2.85\u00b10.11[10]\u00a0M\u2609Radius4.86[11]\u00a0R\u2609Luminosity120.06[9]\u00a0L\u2609Surface gravity (log\u00a0g)3.00[12]\u00a0cgsTemperature9,333[12]\u00a0KMetallicity [Fe\/H]0.10[12]\u00a0dexRotational velocity (v\u00a0sin\u00a0i)44[13]\u00a0km\/sOther designationsDatabase referencesSIMBADdata45 Herculis is a solitary[15]variable star in the northern constellation Hercules. It has the Bayer designation l Herculis and the variable star designation V776 Herculis. The Flamsteed designation for this star comes from the publication Historia Coelestis Britannica by John Flamsteed. It is the 45th star in Flamsteed list of stars in the constellation Hercules, and is visible to the naked eye with a baseline apparent visual magnitude of 5.22.[3]Parallax measurements show this star to be about 400\u00a0light-years away from the Solar System.[2] It is moving closer to the Earth with a heliocentric radial velocity of \u221216\u00a0km\/s.[8]       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4Cowley et at. (1969) assigned this object a classification of B9p Cr,[5] while Abt and Morrell (1995) found a class of A1 Vp Si.[4] Both indicate this is a late B- or early A-type chemically peculiar, or Ap star, with abundance anomalies in chromium or silicon. It is an Alpha2 Canum Venaticorum variable that ranges in visual magnitude from 5.21 down to 5.27.[7] The star has 2.9[10] times the mass of the Sun and 4.9[11] times the Sun’s radius. It is radiating 120[9] times the Sun’s luminosity from its photosphere at an effective temperature of 9,333\u00a0K.[12]References[edit]^ Burke, E. W. Jr.; Barr, T. H. (June 1981). “Photometric UBV period study of eight AP stars”. Publications of the Astronomy Society of the Pacific. 93: 344\u2013350. Bibcode:1981PASP…93..344B. doi:10.1086\/130836. S2CID\u00a0122946991. Retrieved 10 January 2022.^ a b c d e f Brown, A. G. A.;  et\u00a0al. (Gaia collaboration) (August 2018). “Gaia Data Release 2: Summary of the contents and survey properties”. Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A…616A…1G. doi:10.1051\/0004-6361\/201833051. Gaia DR2 record for this source at VizieR.^ a b 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 Abt, Helmut A.; Morrell, Nidia I. (1995). “The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars”. Astrophysical Journal Supplement. 99: 135. Bibcode:1995ApJS…99..135A. doi:10.1086\/192182.^ a b Cowley, A.;  et\u00a0al. (April 1969). “A study of the bright A stars. I. A catalogue of spectral classifications”. Astronomical Journal. 74: 375\u2013406. Bibcode:1969AJ…..74..375C. doi:10.1086\/110819.^ a b Mermilliod, J.-C. (1986). “Compilation of Eggen’s UBV data, transformed to UBV (unpublished)”. Catalogue of Eggen’s UBV Data. Bibcode:1986EgUBV……..0M.^ a b Samus, N. N.;  et\u00a0al. (2017). “General Catalogue of Variable Stars”. Astronomy Reports. 5.1. 61 (1): 80\u201388. Bibcode:2017ARep…61…80S. doi:10.1134\/S1063772917010085. S2CID\u00a0125853869.^ a b Wilson, Ralph Elmer (1953). “General catalogue of stellar radial velocities”. Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C……0W.^ a b c Anderson, E.; Francis, Ch. (2012). “XHIP: An extended hipparcos compilation”. Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL…38..331A. doi:10.1134\/S1063773712050015. S2CID\u00a0119257644.^ a b Netopil, Martin; Paunzen, Ernst; Huemmerich, Stefan; Bernhard, Klaus (July 2017). “An Investigation of the Rotational Properties of Magnetic Chemically Peculiar Stars”. Monthly Notices of the Royal Astronomical Society. 468 (3): 2745\u20132756. arXiv:1703.05218. Bibcode:2017MNRAS.468.2745N. doi:10.1093\/mnras\/stx674. S2CID\u00a0119215348.^ a b Shulyak, D.;  et\u00a0al. (2014). “Interferometry of chemically peculiar stars: Theoretical predictions versus modern observing facilities”. Monthly Notices of the Royal Astronomical Society. 443 (2): 1629. arXiv:1406.6093. Bibcode:2014MNRAS.443.1629S. doi:10.1093\/mnras\/stu1259. S2CID\u00a096452769.^ a b c d Wolff, Sidney Carne (October 1967). “A Spectroscopic and Photometric Study of the AP Stars”. Astrophysical Journal Supplement. 15: 21. Bibcode:1967ApJS…15…21W. doi:10.1086\/190162.^ Royer, F.;  et\u00a0al. (October 2002). “Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i”. Astronomy and Astrophysics. 393: 897\u2013911. arXiv:astro-ph\/0205255. Bibcode:2002A&A…393..897R. doi:10.1051\/0004-6361:20020943. S2CID\u00a014070763.^ “45 Her”. SIMBAD. Centre de donn\u00e9es astronomiques de Strasbourg. Retrieved 2019-06-14.^ Eggleton, P. P.; Tokovinin, A. A. (September 2008). “A catalogue of multiplicity among bright stellar systems”. Monthly Notices of the Royal Astronomical Society. 389 (2): 869\u2013879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111\/j.1365-2966.2008.13596.x. S2CID\u00a014878976.     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