[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/upsilon-ophiuchi-wikipedia\/#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/en\/wiki24\/upsilon-ophiuchi-wikipedia\/","headline":"Upsilon Ophiuchi – Wikipedia","name":"Upsilon Ophiuchi – Wikipedia","description":"From Wikipedia, the free encyclopedia Multiple star in the constellation Ophiuchus Upsilon Ophiuchi Location of \u03c5 Ophiuchi (circled) Observation dataEpoch","datePublished":"2019-11-23","dateModified":"2019-11-23","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\/8\/83\/Ophiuchus_constellation_map.svg\/280px-Ophiuchus_constellation_map.svg.png","url":"https:\/\/upload.wikimedia.org\/wikipedia\/commons\/thumb\/8\/83\/Ophiuchus_constellation_map.svg\/280px-Ophiuchus_constellation_map.svg.png","height":"315","width":"280"},"url":"https:\/\/wiki.edu.vn\/en\/wiki24\/upsilon-ophiuchi-wikipedia\/","about":["Wiki"],"wordCount":4473,"articleBody":"From Wikipedia, the free encyclopediaMultiple star in the constellation OphiuchusUpsilon OphiuchiLocation of \u03c5 Ophiuchi (circled)Observation dataEpoch J2000\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Equinox J2000ConstellationOphiuchusRight ascension16h 27m 48.18720s[1]Declination\u22128\u00b0\u00a022\u2032\u00a018.2245\u2033[1]Apparent\u00a0magnitude\u00a0(V)4.62[2]CharacteristicsSpectral\u00a0typekA2hA5VmA5[3]U\u2212B color index+0.06[4]B\u2212V color index+0.16[4]AstrometryRadial velocity (Rv)\u221230.60[5]\u00a0km\/sProper motion (\u03bc) RA:\u00a0\u221267.49[1]\u00a0mas\/yr Dec.:\u00a0\u221211.75[1]\u00a0mas\/yr Parallax (\u03c0)24.42\u00a0\u00b1\u00a00.91\u00a0mas[1]Distance134 \u00b1 5\u00a0ly (41 \u00b1 2\u00a0pc)Absolute\u00a0magnitude\u00a0(MV)1.75[2]Orbit[6]PrimaryAaCompanionAbPeriod (P)27.218\u00b10.0005\u00a0dSemi-major axis (a)\u2265 0.0583\u00a0AUEccentricity (e)0.744\u00b10.002Periastron epoch (T)2,438,914.84\u00b10.01\u00a0JDArgument of periastron (\u03c9)(secondary)333.7\u00b10.7\u00b0Semi-amplitude (K1)(primary)34.9\u00b10.3 km\/sSemi-amplitude (K2)(secondary)41.1\u00b10.3 km\/sOrbit[7]PrimaryACompanionBPeriod (P)82.8\u00b11.4 yrSemi-major axis (a)0.79\u00b10.03\u2033Eccentricity (e)0.45\u00b10.03Inclination (i)31.2\u00b15.7\u00b0Longitude of the node (\u03a9)86.8\u00b16.9\u00b0Periastron epoch (T)B 1994.1\u00b11.0Argument of periastron (\u03c9)(secondary)177.9\u00b17.4\u00b0DetailsMass1.94[8]\u00a0M\u2609Radius1.9[8]\u00a0R\u2609Luminosity16.56[2]\u00a0L\u2609Surface gravity (log\u00a0g)4.45[9]\u00a0cgsTemperature8,364[9]\u00a0KMetallicity [Fe\/H]+0.14[2]\u00a0dexRotational velocity (v\u00a0sin\u00a0i)44[10]\u00a0km\/sOther designations Alkarab, \u03c5\u00a0Oph, 3\u00a0Ophiuchi, BD\u221208\u00b04243, FK5\u00a03299, GC\u00a022134, HD\u00a0148367, HIP\u00a080628, HR\u00a06129, SAO\u00a0141187, CCDM J16278-0822AB, WDS J16278-0822[11]Database referencesSIMBADdataUpsilon Ophiuchi is a triple star[12] system in the equatorial constellation of Ophiuchus. It has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.62.[2] The distance to this system is approximately 134\u00a0light years based on parallax.[1] It is drifting closer with a radial velocity of \u221230.6\u00a0km\/s.[5]The variable radial velocity of the brighter component was first observed by H. A. Abt in 1961. It is a double-lined spectroscopic binary system with an orbital period of 27.2\u00a0days and an eccentricity of 0.74.[6] They have a combined magnitude of 4.71. Both components are similar stars with a combined  stellar classification of kA2hA5VmA5, and one or both are Am stars.[3] The third component has an 82.8\u00a0year orbit with the inner pair at an eccentricity of 0.45.[7] The system is a source for X-ray emission.[13]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 e 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. Vizier catalog entry^ 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 Mallama, A. (2014). “Sloan Magnitudes for the Brightest Stars”. The Journal of the American Association of Variable Star Observers. 42 (2): 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry^ a b Wilson, R. E. (1953). “General Catalogue of Stellar Radial Velocities”. Carnegie Institute Washington D.C. Publication. Carnegie Institution for Science. Bibcode:1953GCRV..C……0W. ISBN\u00a09780598216885. LCCN\u00a054001336.^ a b Gutmann, F. (1965). “A study of the spectroscopic binary 3nu Ophiuchi (HD 148367)”. Publications of the Dominion Astrophysical Observatory Victoria. 12: 391\u2013399. Bibcode:1965PDAO…12..391G.^ a b “Sixth Catalog of Orbits of Visual Binary Stars”. United States Naval Observatory. Retrieved 24 May 2017.^ a b Allende Prieto, C.; Lambert, D. L. (1999). “Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures”. Astronomy and Astrophysics. 352: 555\u2013562. arXiv:astro-ph\/9911002. Bibcode:1999A&A…352..555A. Vizier catalog entry^ a b David, Trevor J.; Hillenbrand, Lynne A. (2015). “The Ages of Early-Type Stars: Str\u00f6mgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets”. The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ…804..146D. doi:10.1088\/0004-637X\/804\/2\/146. S2CID\u00a033401607. Vizier catalog entry^ 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.^ “ups Oph”. SIMBAD. Centre de donn\u00e9es astronomiques de Strasbourg. Retrieved 2019-10-21.{{cite web}}:  CS1 maint: postscript (link)^ Eggleton, P. P.; Tokovinin, A. A. (2008). “A catalogue of multiplicity among bright stellar systems”. Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111\/j.1365-2966.2008.13596.x. S2CID\u00a014878976. Vizier catalog entry^ 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  "},{"@context":"http:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/#breadcrumbitem","name":"Enzyklop\u00e4die"}},{"@type":"ListItem","position":2,"item":{"@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/upsilon-ophiuchi-wikipedia\/#breadcrumbitem","name":"Upsilon Ophiuchi – Wikipedia"}}]}]