[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/en\/wiki19\/alruba-wikipedia\/#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/en\/wiki19\/alruba-wikipedia\/","headline":"Alruba – Wikipedia","name":"Alruba – Wikipedia","description":"From Wikipedia, the free encyclopedia Star in the constellation Draco Alruba,[9] a name derived from Arabic for “the foal”, is","datePublished":"2019-08-05","dateModified":"2019-08-05","author":{"@type":"Person","@id":"https:\/\/wiki.edu.vn\/en\/wiki19\/author\/lordneo\/#Person","name":"lordneo","url":"https:\/\/wiki.edu.vn\/en\/wiki19\/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\/wiki19\/alruba-wikipedia\/","about":["Wiki"],"wordCount":3438,"articleBody":"From Wikipedia, the free encyclopediaStar in the constellation DracoAlruba,[9] a name derived from Arabic for “the foal”, is a suspected astrometric binary[10]star system in the northern circumpolar constellation of Draco. It is just barely visible to the naked eye as a dim point of light with an apparent visual magnitude of 5.76.[2] Based on parallax measurements obtained during the Gaia mission, it is located at a distance of about 457 light-years (140 parsecs) from the Sun. The system is drifting closer with a radial velocity of \u22122\u00a0km\/s.[5]The visible component is an A-type main-sequence star with a stellar classification of A0\u00a0V.[4] It is about 58[7]\u00a0million years old with three[3] times the mass of the Sun and has a high rate of spin, showing a projected rotational velocity of 170\u00a0km\/s.[3] The star is radiating 147[3] times the luminosity of the Sun from its photosphere at an effective temperature of 9,226\u00a0K.[3] The system is a source for X-ray emission, which is most likely coming from the unseen companion.[11]Nomenclature[edit]In the Henry Draper catalogue this system has the designation HD 161693, while it has the identifier HR 6618 in the Bright Star Catalogue.[8]It bore the traditional Arabic name \u0627\u0644\u0631\u0628\u0639 Al Ruba\u02bd “the foal” (specifically a young camel born in the spring), a member of the Mother Camels asterism in early Arabic astronomy.[12][13]In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[14] to catalogue and standardize proper names for stars. The WGSN approved the name Alruba for this star on 1 June 2018 and it is now so entered on the List of IAU-approved Star Names.[9]References[edit]^ a b c d e 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 Oja, T. (March 1985), “UBV photometry of stars whose positions are accurately known. II”, Astronomy and Astrophysics Supplement Series, 59: 461\u2013464, Bibcode:1985A&AS…59..461O.^ a b c d e f g h i Zorec, J.; Royer, F. (2012), “Rotational velocities of A-type stars. IV. Evolution of rotational velocities”, Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A…537A.120Z, doi:10.1051\/0004-6361\/201117691, S2CID\u00a055586789.^ a b Abt, Helmut A.; Morrell, Nidia I. (1995), “The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars”, The Astrophysical Journal Supplement Series, 99: 135, Bibcode:1995ApJS…99..135A, doi:10.1086\/192182.^ a b 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.^ a b Wu, Yue;  et\u00a0al. (2010), “Coud\u00e9-feed stellar spectral library \u2013 atmospheric parameters”, Astronomy & Astrophysics, 525: A71, arXiv:1009.1491, Bibcode:2011A&A…525A..71W, doi:10.1051\/0004-6361\/201015014, S2CID\u00a053480665.^ a b Gullikson, Kevin;  et\u00a0al. (2016), “The Close Companion Mass-Ratio Distribution of Intermediate-Mass Stars”, The Astronomical Journal, 152 (2): 40, arXiv:1604.06456, Bibcode:2016AJ….152…40G, doi:10.3847\/0004-6256\/152\/2\/40, S2CID\u00a0119179065.^ a b “HD 161693 — Star”, SIMBAD Astronomical Database, Centre de Donn\u00e9es astronomiques de Strasbourg, retrieved 2018-07-01.^ a b Naming Stars, IAU.org, retrieved 2018-07-01.^ 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.^ Schr\u00f6der, C.; Schmitt, J. H. M. M. (November 2007), “X-ray emission from A-type stars”, Astronomy and Astrophysics, 475 (2): 677\u2013684, Bibcode:2007A&A…475..677S, doi:10.1051\/0004-6361:20077429.^ Allen, R. H. (1963), Star Names: Their Lore and Meaning (rep.\u00a0ed.), New York, NY: Dover Publications Inc., pp.\u00a0207\u2013212, ISBN\u00a00-486-21079-0, retrieved 2020-01-07.^ Garfinkle, Robert A. (2008), Star-Hopping: Your Visa to Viewing the Universe (2nd\u00a0ed.), Cambridge University Press, p.\u00a0183, ISBN\u00a0978-0521598897.^ “International Astronomical Union | IAU”, www.iau.org, retrieved 2018-07-01.  "},{"@context":"http:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"https:\/\/wiki.edu.vn\/en\/wiki19\/#breadcrumbitem","name":"Enzyklop\u00e4die"}},{"@type":"ListItem","position":2,"item":{"@id":"https:\/\/wiki.edu.vn\/en\/wiki19\/alruba-wikipedia\/#breadcrumbitem","name":"Alruba – Wikipedia"}}]}]