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{{DISPLAYTITLE:Upsilon2 Centauri}}{{other stars by Bayer designation|Upsilon Centauri{{!}}υ Centauri}}{{Starbox begin
| name = Upsilon2 Centauri
}}{{Starbox observe
| epoch = J2000.0
| equinox = J2000.0 (ICRS)
| constell = Centaurus
| ra = {{RA|14|01|43.49909 }}
| dec = {{DEC|−45|36|12.2767}}
| appmag_v = +4.33[3]
}}{{Starbox character
| class = F7 II/III[4]
| b-v = +0.61[3]
| u-b = +0.26[3]
| variable = None[7]
}}{{Starbox astrometry
| radial_v = {{Val|−7.8|7.4}}[8]
| prop_mo_ra = {{Val|+8.64|1.09}}
| prop_mo_dec = {{Val|-16.25|0.88}}
| parallax = 2.57
| p_error = 1.05
| parallax_footnote =
| absmag_v = −3.51[7]
}}{{Starbox orbit
| reference = [13]
| period_unitless = 207.357 d
| eccentricity = 0.55
| periastron = 2423880.5 JD
| periarg = 88
| k1 = 12.7
}}{{Starbox detail
| source =
| mass = {{Val|6.86|0.39}}[14]
| radius =
| luminosity_bolometric = 3,919[14]
| temperature = 6,495[14]
| gravity = 2.00[17]
| metal_fe =
| rotational_velocity = 0.0[17]
| age_myr = {{Val|45.9|4.0}}[19]
}}{{Starbox catalog
| names = {{odlist | B=υ2 Cen | CD=−44° 9040 | HD=122223 | HIP=68523 | HR=5260 | SAO=224621 | GC=18939 }}[20]
}}{{Starbox reference
| Simbad = ups02+Cen
}}{{Starbox end}}Upsilon2 Centauri (υ2 Centauri) is a binary star[13] system in the southern constellation Centaurus. It is visible to the naked eye with an apparent visual magnitude of +4.33.[3] Based upon an annual parallax shift of just 2.57 mas as seen from Earth,[ this star is located roughly 1,300 light years from the Sun. Relative to its neighbors, the system has a peculiar velocity of {{Val|39.2|8.8|15.2|u=km/s}} and it may form a runaway star system.[19]]This is a single-lined spectroscopic binary star system with an orbital period of 207.357 days and an eccentricity of 0.55.[13] The primary component has the spectrum of an evolved F-type giant/bright giant hybrid with a stellar classification of F7 II/III.[4] It is around 46[19] million years old with 6.9 times the mass of the Sun. The star is radiating 3,919 times the Sun's luminosity from its photosphere at an effective temperature of 6,495 K.[14] References1. ^1 2 {{citation | title=Cepheids and nonvariable supergiants | last1=Eggen | first1=O. J. | postscript=. | journal=Astronomical Journal | volume=90 | pages=1260–1277 | date=July 1985 | doi=10.1086/113834 | bibcode=1985AJ.....90.1260E }}
2. ^1 2 {{citation | display-authors=1 | last1=Mallik | first1=Sushma V. | last2=Parthasarathy | first2=M. | last3=Pati | first3=A. K. | title=Lithium and rotation in F and G dwarfs and subgiants | journal=Astronomy and Astrophysics | postscript=. | volume=409 | pages=251–261 | date=October 2003 | doi=10.1051/0004-6361:20031084 | bibcode=2003A&A...409..251M }}
3. ^1 {{citation | last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C. | title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project | journal=Astronomy & Astrophysics | volume=546 | id=A61 | pages=14 | date=October 2012 | doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D | arxiv=1208.3048 | postscript=. }}
4. ^1 2 3 {{citation | last1=Tetzlaff | first1=N. | last2=Neuhäuser | first2=R. | last3=Hohle | first3=M. M. | title=A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun | journal=Monthly Notices of the Royal Astronomical Society | volume=410 | issue=1 | pages=190–200 | date=January 2011 | doi=10.1111/j.1365-2966.2010.17434.x | bibcode=2011MNRAS.410..190T | arxiv=1007.4883 | postscript=. }}
5. ^1 2 3 4 {{citation | display-authors=1 | last1=Hohle | first1=M. M. | last2=Neuhäuser | first2=R. | last3=Schutz | first3=B. F. | title=Masses and luminosities of O- and B-type stars and red supergiants | journal=Astronomische Nachrichten | volume=331 | issue=4 | page=349 | date=April 2010 | doi=10.1002/asna.200911355 | bibcode=2010AN....331..349H | arxiv=1003.2335 | postscript=. }}
6. ^1 2 3 {{citation | display-authors=1 | last1=Pourbaix | first1=D. | last2=Tokovinin | first2=A. A. | last3=Batten | first3=A. H. | last4=Fekel | first4=F. C. | last5=Hartkopf | first5=W. I. | last6=Levato | first6=H. | last7=Morrell | first7=N. I. | last8=Torres | first8=G. | last9=Udry | first9=S. | year=2004 | pages=727–732 | volume=424 | title=SB9: The Ninth Catalogue of Spectroscopic Binary Orbits | journal=Astronomy & Astrophysics | bibcode=2009yCat....102020P | doi=10.1051/0004-6361:20041213 | postscript=. | arxiv=astro-ph/0406573}}
7. ^1 2 {{citation |title=Michigan Catalogue of two dimensional spectral types for the HD stars | last1=Houk|first1=N. | journal=Michigan Spectral Survey | volume=2 | date=1987 | postscript=. | bibcode=1978mcts.book.....H }}
8. ^1 2 3 4 {{citation | title=New UBVRI photometry for 900 supergiants | last1=Fernie | first1=J. D. | journal=Astrophysical Journal Supplement Series | volume=52 | pages=7 | year=1983 | postscript=. | doi=10.1086/190856 | bibcode=1983ApJS...52....7F }}
9. ^1 {{cite simbad | title=ups02 Cen | accessdate=2017-08-29 | postscript=. }}
[1][2][3][4][5][6][7][8][9]
}}{{Stars of Centaurus|state=collapsed}} 7 : F-type bright giants|Bayer objects|Centaurus (constellation)|Durchmusterung objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects |