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{{Starbox begin
{{Zvezda
| name = Alfa Kentavra AB<ref group=note>[[Proxima Centauri]] is gravitationally bound to the α Centauri system, but for practical and historical reasons it is described in detail in its own article.</ref>
| image = [[Slika:Position Alpha Cen.png|250px]]
}}
{{Starbox image
| image = [[File:Position Alpha Cen.png|320px]]
| caption = Lega Alfe Kentavra
}}
| epoch = [[J2000,0]]
{{Starbox observe 2s
| ra = {{RA|14|39|36,4951 / 35,0803}}
| epoch = [[J2000.0]]
| ra_info = [http://nstars.nau.edu/index.cfm?fuseaction=singleSearch.astrometry&SystemID=1439m6050]
| dec = {{DEC|-60|50|02,308 / 13,761}}
| appmag_v = -0,01 / +1,33
| constell = [[Kentaver (ozvezdje)|Kentaver]]
| component1 = Alpha Centauri A
| class =G2V / K2IV
| ra1 = {{RA|14|39|36,49400}}<ref name="hipparcos">{{cite journal
| b-v = +0,69 / +0,90
| bibcode = 2007A&A...474..653V
| u-b = +0,23 / +0,63
| title = Validation of the new Hipparcos reduction
| variable =
| journal = Astronomy and Astrophysics
| radial_v = -21,6
| prop_mo_ravolume = -3678,19474
| prop_mo_decissue = 481,842
| parallaxpages = 747,23653–664
| p_errorlast1 = 1,17Van Leeuwen
| absmag_vfirst1 = 4,38 / 5,71F.
| ageyear = 4,85{{e|9}}2007
| doi = 10.1051/0004-6361:20078357
| metal = 1,51 / 1,60 Sončeve
| massarxiv = 1,100 /= 0,9070708.1752
}}</ref>
| radius = 1,227 / 0,865
| dec1={{DEC|–60|50|02,3737}}<ref name="hipparcos" />
| gravity = 4,30 / 4,37
| appmag_v1 = +0.01<ref name="ducati">{{cite journal
| rotation = 22&nbsp;d / 41&nbsp;d
| bibcode = 2002yCat.2237....0D
| luminosity = 1,519 / 0,500
| title = VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system
| temperature = 5790 / 5260
| journal = CDS/ADC Collection of Electronic Catalogues
| name = Alfa Kentavra AB
| periodvolume = 79,912237
| axispages = 17,570
| eccentricitylast1 = 0,5179Ducati
| inclinationfirst1 = 79,205J. R.
| nodeyear = 204,852002
}}</ref>
| periastron = 1875,66
| component2 = Alpha Centauri B
| periarg = 231,65
| referencera2 = {{RA|14|39|35,06311}}<ref name=Pourbaix>{{navedi"hipparcos" revijo/>
| dec2 = {{DEC|–60|50|15,0992}}<ref name="hipparcos" />
| author=Pourbaix, D.
| appmag_v2 = +1.33<ref name="ducati" />
| author2=Nidever, D.|author3=McCarthy, C.|author4=Butler, R. P.|author5=Tinney, C. G.|author6=Marcy, G. W.|author7=Jones, H. R. A.|author8=Penny, A. J.|author9=Carter, B. D.; Bouchy, F.
| title=Constraining the difference in convective blueshift between the components of alpha Centauri with precise radial velocities
| journal=Astronomy and Astrophysics
| year=2002 | volume=386 | issue=1 | pages=208–285
| url=http://adsabs.harvard.edu/abs/2002A%26A...386..280P
| accessdate=2008-06-15
| doi=10.1051/0004-6361:20020287 }}</ref>
| Simbad = alpha+centauri
| ARICNS = 01151
| names = Rigil Kentaurus, Rigil Kent, Toliman, Bungula, [[Osnovni katalog|FK5]]&nbsp;538, [[Durchmusterung|CP(D)]]−60°5483, GC&nbsp;19728, CCDM&nbsp;J14396-6050
 
'''α Cen A'''
 
[[zvezdni katalog|Gl]]&nbsp;559 A, [[Katalog svetlih zvezd|HR]]&nbsp;5459, [[Katalog Henryja Draperja|HD]]&nbsp;128620, [[Splošni katalog trigonometričnih paralaks|GCTP]]&nbsp;3309.00, [[zvezdni katalog|LHS]]&nbsp;50, [[Zvezdni katalog Smithsonovega astrofizkalnega observatorija|SAO]]&nbsp;252838, [[Hipparcos catalogue|HIP]]&nbsp;71683
 
'''α Cen B'''
 
[[zvezdni katalog|Gl]]&nbsp;559 B, [[Katalog svetlih zvezd|HR]]&nbsp;5460, [[Katalog Henryja Draperja|HD]]&nbsp;128621, [[zvezdni katalog|LHS]]&nbsp;51, [[Katalog Hipparcosa|HIP]]&nbsp;71681
 
'''α Cen C''' (= '''Proxima Cen''')
 
[[zvezdni katalog|LHS]]&nbsp;49, [[Katalog Hipparcosa|HIP]]&nbsp;70890
}}
{{Starbox character
 
| engvar = en-UK
| component = A
| class = G2V<ref name=torres2006>{{cite journal
| last1 = Torres
| first1 = C. A. O.
| last2 = Quast
| first2 = G. R.
| last3 = da Silva
| first3 = L .
| last4 = de la Reza
| first4 = R.
| last5 = Melo
| first5 = C. H. F.
| last6 = Sterzik
| first6 = M.
| title = Search for associations containing young stars (SACY)
| journal = Astronomy and Astrophysics
| volume = 460
| issue = 3
| year = 2006
| pages = 695–708
| issn = 0004-6361
| doi = 10.1051/0004-6361:20065602
| arxiv = astro-ph/0609258
| bibcode = 2006A&A...460..695T
}}</ref>
| b-v = +0,71<ref name="ducati" />
| u-b = +0,24<ref name="ducati" />
| component2 = B
| class2 = K1V<ref name="torres2006" />
| b-v2 = +0,88<ref name="ducati" />
| u-b2 = +0,68<ref name="ducati" />
}}
{{Starbox astrometry
| component1 = A
| radial_v = {{val|−21.4|0.76}}<ref name="valenti2005">{{cite journal
| last1 = Valenti
| first1 = Jeff A.
| last2 = Fischer
| first2 = Debra A.
| title = Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs
| journal = The Astrophysical Journal Supplement Series
| volume = 159
| issue = 1
| year = 2005
| pages = 141–166
| issn = 0067-0049
| doi = 10.1086/430500
| bibcode = 2005ApJS..159..141V
}}</ref>
| prop_mo_ra = −3679,25<ref name="hipparcos" />
| prop_mo_dec = 473,67<ref name="hipparcos" />
| parallax = 754,81
| p_error = 4,11
| parallax_footnote =<ref name="hipparcos" />
| dist_ly = 4,37<ref name="wilkinson2012">{{cite book
| last1 = Wilkinson
| first1 = John
| title = New Eyes on the Sun
| year = 2012
| pages = 219–236
| issn = 1614-659X
| doi = 10.1007/978-3-642-22839-1_10
| chapter = The Sun and Stars
| series = Astronomers' Universe
| isbn = 978-3-642-22838-4
}}</ref>
| absmag_v = 4,38<ref name="Wiegert" />
| component2 = B
| radial_v2 = {{val|−18,6|1,64}}<ref name="valenti2005" />
| prop_mo_ra2 = −3614,39<ref name="hipparcos" />
| prop_mo_dec2 = 802,98<ref name="hipparcos" />
| parallax2 = 754,81
| p_error2 = 4,11
| parallax_footnote2 =<ref name="hipparcos" />
| dist_ly2 = 4,37<ref name="wilkinson2012" />
| absmag_v2 = 5,71<ref name="Wiegert">{{cite journal
| author1 = P. A. Wiegert
| author2 = M. J. Holman
| title = The stability of planets in the Alpha Centauri system
| journal = [[The Astronomical Journal]]
| year = 1997
| volume = 113
| pages = 1445&nbsp;– 1450
| bibcode = 1997AJ....113.1445W
| doi = 10.1086/118360
| arxiv = astro-ph/9609106
}}</ref>
}}
{{Starbox detail
| source = <!--[source url]-->
| component1 = Alpha Centauri A
| mass = 1,100<ref name="Thevenin02" />
| radius = {{Val|1,2234|0,0053}}<ref name="kervella2017">{{cite journal
| title = The radii and limb darkenings of α Centauri A and B. Interferometric measurements with VLTI/PIONIER
| journal = Astronomy & Astrophysics
| first1 = P.
| last1 = Kervella
| first2 = L.
| last2 = Bigot
| first3 = A.
| last3 = Gallenne
| first4 = F.
| last4 = Thévenin
| volume = 597
| at = A137
| date = January 2017
| doi = 10.1051/0004-6361/201629505
| bibcode = 2017A&A...597A.137K
| arxiv = 1610.06185
}}</ref>
| gravity = 4,30<ref name="aaa449">{{cite journal
| author1 = Gilli G.
| author2 = Israelian G.
| author3 = Ecuvillon A.
| author4 = Santos N. C.
| author5 = Mayor M.
| year = 2006
| title = Abundances of Refractory Elements in the Atmospheres of Stars with Extrasolar Planets
| journal = [[Astronomy and Astrophysics]]
| volume = 449
| issue = 2
| pages = 723–36
| id = libcode 2005astro.ph.12219G
| doi = 10.1051/0004-6361:20053850
| arxiv = astro-ph/0512219
| bibcode = 2006A&A...449..723G
}}</ref>
| luminosity = 1,519<ref name="Thevenin02" />
| luminosity_bolometric = <!--Luminosity (in solar luminosities), bolometric-->
| luminosity_visual = <!--Luminosity (in solar luminosities), visual (V)-->
| temperature = 5.790<ref name="Thevenin02" />
| metal_fe = 0,20<ref name="Thevenin02" />
| rotational_velocity = {{val|2,7|0,7}}<ref name="aaa470">{{cite journal
| last = Bazot
| first = M.
| year = 2007
| title = Asteroseismology of α Centauri A. Evidence of rotational splitting
| journal = [[Astronomy and Astrophysics]]
| volume = 470
| issue = 1
| pages = 295–302
| doi = 10.1051/0004-6361:20065694
| bibcode = 2007A&A...470..295B
| arxiv = 0706.1682
| display-authors = etal
}}</ref>
| rotation = {{val|22|5,9||ul=dni}}<ref name="aaa470"/>
| age_gyr =
| component2 = Alpha Centauri B
| mass2 = 0,907<ref name="Thevenin02" />
| radius2 = {{Val|0,8632|0,0037}}<ref name="kervella2017" />
| gravity2 = 4,37<ref name="aaa449" />
| luminosity2 = 0,5002<ref name="Thevenin02" />
| luminosity_bolometric2 = <!--Luminosity (in solar luminosities), bolometric-->
| luminosity_visual2 = <!--Luminosity (in solar luminosities), visual (V)-->
| temperature2 = 5.260<ref name="Thevenin02" />
| metal2 = 0,23<ref name="Thevenin02">{{cite journal|author1=Thévenin, F.|author2=Provost, J.|author3=Morel, P.|author4=Berthomieu, G.|author5=Bouchy, F.|author6=Carrier, F.|year=2002|title=Asteroseismology and calibration of alpha Cen binary system|journal=Astronomy & Astrophysics|volume=392|page=L9|arxiv=astro-ph/0206283|bibcode=2002A&A...392L...9T|doi=10.1051/0004-6361:20021074}}</ref>
| rotational_velocity2 = {{val|1,1|0,8}}<ref name=raassen2003>{{cite journal|bibcode=2003A&A...400..671R|doi=10.1051/0004-6361:20021899|title=Chandra-LETGS X-ray observation of α Centauri: A nearby (G2V + K1V) binary system|journal=Astronomy & Astrophysics|volume=400|issue=2|pages=671–678|year=2003|last1=Raassen|first1=A. J. J|last2=Ness|first2=J.-U|last3=Mewe|first3=R|last4=Van Der Meer|first4=R. L. J|last5=Burwitz|first5=V|last6=Kaastra|first6=J. S}}</ref>
| rotation2 = 36<ref name="dewarf2010">{{cite journal
| last1 = DeWarf
| first1 = L.
| last2 = Datin
| first2 = K.
| last3 = Guinan
| first3 = E.
| title = X-ray, FUV, and UV Observations of α Centauri B: Determination of Long-term Magnetic Activity Cycle and Rotation Period
| journal = The Astrophysical Journal
| volume = 722
| issue = 1
| year = 2010
| pages = 343–357
| doi = 10.1088/0004-637X/722/1/343
| arxiv = 1009.1652
| bibcode = 2010ApJ...722..343D
}}</ref> days
| age_gyr2 = {{val|5,3|0,3}}<ref name=joyce>{{cite journal|bibcode=2018ApJ...864...99J|title=Classically and Asteroseismically Constrained 1D Stellar Evolution Models of α Centauri a and B Using Empirical Mixing Length Calibrations|journal=The Astrophysical Journal|volume=864|issue=1|pages=99|last1=Joyce|first1=M.|last2=Chaboyer|first2=B.|year=2018|arxiv=1806.07567|doi=10.3847/1538-4357/aad464}}</ref>
}}
{{Starbox orbit
| primary=A
| name=B
| period={{val|79,91|0,011}}
| axis={{val|17,57|0,022}}
| eccentricity={{val|0,5179|0,00076}}
| inclination={{val|79,205|0,041}}
| node={{val|204,85|0,084}}
| periastron={{val|1875,66|0,012}}
| periarg={{val|231,65|0,076}}
| reference=<ref name="Pourbaix">{{cite journal
| last = Pourbaix
| first = D.
| year = 2002
| title = Constraining the difference in convective blueshift between the components of alpha Centauri with precise radial velocities
| journal = [[Astronomy and Astrophysics]]
| volume = 386
| issue = 1
| pages = 280–85
| bibcode = 2002A&A...386..280P
| doi = 10.1051/0004-6361:20020287
| arxiv = astro-ph/0202400
| display-authors = etal
}}</ref>
}}
{{Starbox catalog
| names = [[Gliese Catalogue of Nearby Stars|Gliese]]&nbsp;559, [[Fifth Fundamental Catalogue|FK5]]&nbsp;538, [[Cordoba Durchmusterung|CD]]−60°5483, [[Catalog of Components of Double and Multiple Stars|CCDM]]&nbsp;J14396-6050, [[Boss General Catalogue|GC]]&nbsp;19728
| component1 = α Cen A
| names1 = Rigil Kentaurus, Rigil Kent, [[Bayer designation|α<sup>1</sup>]]&nbsp;Centauri, [[Harvard Revised catalogue|HR]]&nbsp;5459, [[Henry Draper catalogue|HD]]&nbsp;128620, [[General Catalogue of Trigonometric Parallaxes|GCTP]]&nbsp;3309.00, [[Luyten Half-Second catalogue|LHS]]&nbsp;50, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;252838, [[Hipparcos catalogue|HIP]]&nbsp;71683
| component2 = α Cen B
| names2 = Toliman, [[Bayer designation|α<sup>2</sup>]]&nbsp;Centauri, [[Harvard Revised catalogue|HR]]&nbsp;5460, [[Henry Draper catalogue|HD]]&nbsp;128621, [[Luyten Half-Second catalogue|LHS]]&nbsp;51, [[Hipparcos catalogue|HIP]]&nbsp;71681
}}
{{Starbox reference
| Simbad=alpha+centauri|sn=AB
| Simbad2=TYC+9007-5849-1|sn2=A
| Simbad3=TYC+9007-5848-1|sn3=B
| NSTED =alpha+centauri
| ARICNS=01151
| EPE =alf+cen
}}
{{Starbox end}}
'''Alfa Kentavra''' (α Kentavra / α Cen), znana tudi kot '''Rigil Kentaurus''', '''Rigil Kent''' ali '''Toliman''', je najsvetlejša [[zvezda]] v južnem [[ozvezdje|ozvezdju]] [[Kentaver (ozvezdje)|Kentavra]]. Zvezda je [[dvojna zvezda|dvozvezdje]], Alfa Kentavra AB (α Cen AB). Z golim očesom jo vidimo kot eno zvezdo, s svojim [[navidezni sij|navideznim sijem]] pa je na tretjem mestu [[seznam najsvetlejših zvezd|najsvetlejših zvezd]] na nočnem nebu.
 
[[zvezdni sistem|Sistem]] Alfe Kentavra je nabližje [[Osončje|Osončju]] in je [[razdalja|oddaljen]] približno 1,3 [[parsek]]a, oziroma 4,3 [[svetlobno leto|svetlobna leta]].
 
== Opombe==
{{Reflist|group="note"}}
 
== Sklici ==