[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/en\/wiki24\/44-ophiuchi-wikipedia\/#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/en\/wiki24\/44-ophiuchi-wikipedia\/","headline":"44 Ophiuchi – Wikipedia","name":"44 Ophiuchi – Wikipedia","description":"before-content-x4 From Wikipedia, the free encyclopedia after-content-x4 Star in the constellation Ophiuchus 44 Ophiuchi after-content-x4 Location of 44 Ophiuchi (circled)","datePublished":"2022-06-14","dateModified":"2022-06-14","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\/44-ophiuchi-wikipedia\/","wordCount":4029,"articleBody":"     (adsbygoogle = window.adsbygoogle || []).push({});before-content-x4From Wikipedia, the free encyclopedia       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4Star in the constellation Ophiuchus44 Ophiuchi       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4Location of 44 Ophiuchi (circled)Observation dataEpoch J2000\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Equinox J2000ConstellationOphiuchusRight ascension17h 26m 22.21749s[1]Declination\u221224\u00b0\u00a010\u2032\u00a031.1190\u2033[1]Apparent\u00a0magnitude\u00a0(V)4.16[2]CharacteristicsSpectral\u00a0typekA5hA9mF1III[3]U\u2212B color index+0.12[4]B\u2212V color index+0.28[4]AstrometryRadial velocity (Rv)\u221237.20[5]\u00a0km\/sProper motion (\u03bc) RA:\u00a0+0.10[1]\u00a0mas\/yr Dec.:\u00a0\u2212118.18[1]\u00a0mas\/yr Parallax (\u03c0)39.22\u00a0\u00b1\u00a00.24\u00a0mas[1]Distance83.2 \u00b1 0.5\u00a0ly (25.5 \u00b1 0.2\u00a0pc)Absolute\u00a0magnitude\u00a0(MV)2.13[2]DetailsMass1.77[6]\u00a0M\u2609Radius1.9[7]\u00a0R\u2609Luminosity13[6]\u00a0L\u2609Surface gravity (log\u00a0g)4.15[8]\u00a0cgsTemperature7,559[8]\u00a0KMetallicity [Fe\/H]+0.30[2]\u00a0dexRotational velocity (v\u00a0sin\u00a0i)78[6]\u00a0km\/sAge1.028[8]\u00a0GyrOther designationsDatabase referencesSIMBADdata44 Ophiuchi is a single[10]star in the constellation Ophiuchus. It has the Bayer designation b Ophiuchi, while 44 Ophiuchi is the Flamsteed designation. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.16.[2] The distance to this object is approximately 83.2\u00a0light years based on parallax.[1] It is drifting closer to the Earth with a heliocentric radial velocity of -37.2\u00a0km\/s,[5] and is predicted to come within 30 light-years around 585,000\u00a0years from now.[11]This is an Am star with a stellar classification of kA5hA9mF1III,[3] indicating it has the luminosity class of a giant star with a spectrum that matches an A5 star based on the calcium K line, and an A9 star from the hydrogen and metal lines. It is around a billion years old[8] with 1.77[6] times the mass of the Sun and 1.9[7] times the Sun’s girth. The star is radiating 13[6] times the Sun’s luminosity from its photosphere at an effective temperature of 7,559\u00a0K.[8] It retains a moderately high rotation rate, showing a projected rotational velocity of 78\u00a0km\/s.[6]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 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 Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O’Donoghue, A. A.; Knox, E. R. (2006). “Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc–The Southern Sample”. The Astronomical Journal. 132 (1): 161\u2013170. arXiv:astro-ph\/0603770. Bibcode:2006AJ….132..161G. doi:10.1086\/504637. S2CID\u00a0119476992.^ 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 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 c d e f Zorec, J.; Royer, F. (2012). “Rotational velocities of A-type stars”. Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A…537A.120Z. doi:10.1051\/0004-6361\/201117691. S2CID\u00a055586789. Vizier catalog entry^ 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 c d e 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^ “b Oph”. SIMBAD. Centre de donn\u00e9es astronomiques de Strasbourg. Retrieved 2019-06-21.^ 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.^ Bailer-Jones, C. A. L. (March 2015). “Close encounters of the stellar kind”. Astronomy & Astrophysics. 575: 13. arXiv:1412.3648. Bibcode:2015A&A…575A..35B. doi:10.1051\/0004-6361\/201425221. S2CID\u00a059039482. A35.       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4"},{"@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\/44-ophiuchi-wikipedia\/#breadcrumbitem","name":"44 Ophiuchi – Wikipedia"}}]}]