{{Short description|Binary star in the constellation Centaurus}} {{For|'''n Centauri'''|HD 111968}} {{Starbox begin | name = N Centauri }} {{Starbox observe 2s | epoch = J2000.0 | constell = [[Centaurus]]<ref name=constellation/> | component1 = A | ra1 = {{RA|13|52|04.86231}}<ref name=dr3a/> | dec1 = {{DEC|−52|48|41.5063}}<ref name=dr3a/> | appmag_v1 = 5.26<ref name=xhipa/> | component2 = B | ra2 = {{RA|13|52|02.97130}}<ref name=dr3b/> | dec2 = {{DEC|−52|48|35.7079}}<ref name=dr3b/> | appmag_v2 = 7.49<ref name=xhipb/> }} {{Starbox character | component1 = A | type = [[main sequence]]<ref name=dr3a/> | class = B9V<ref name=skiff2014/><ref name=lindroos1983/> | b-v = {{Val|−0.084|0.003}}<ref name=xhipa/> | u-b = | variable = | component2 = B | type2 = [[main sequence]]<ref name=dr3b/> | class2 = F0Vn<ref name=skiff2014/><ref name=lindroos1983/> | b-v2 = {{Val|+0.286|0.009}}<ref name=xhipb/> | u-b2 = | variable2 = }} {{Starbox astrometry | component1 = A | radial_v = {{Val|+27.0|4.2}}<ref name=xhipa/> | prop_mo_ra = −38.997<ref name=dr3a/> | prop_mo_dec = −26.863<ref name=dr3a/> | parallax = 10.7449 | p_error = 0.0882 | parallax_footnote = <ref name=dr3a/> | absmag_v = +0.76<ref name=xhipa/> | component2 = B | radial_v2 = {{Val|+11.17|0.46}}<ref name=dr3b/> | prop_mo_ra2 = −38.997<ref name=dr3b/> | prop_mo_dec2 = −26.863<ref name=dr3b/> | parallax2 = 10.7449 | p_error2 = 0.0882 | parallax_footnote2 = <ref name=dr3b/> | absmag_v2 = }} {{Starbox detail | source = | component1 = A | mass = 3.04<ref name=tic/> | radius = 2.458<ref name=tic/> | luminosity = 70.18<ref name=xhipa/> | temperature = {{Val|13032|443|fmt=commas}}<ref name=David2015/> | metal_fe = | gravity = {{Val|4.32|0.14}}<ref name=David2015/> | rotational_velocity = 205<ref name=David2015/> | age_myr = 66<ref name=David2015/> | component2 = B | mass2 = {{Val|1.48|0.01}}<ref name=Bochanski2018/> | temperature2 = 7,354<ref name=GaiaDR2b/> | luminosity2 = 6.43<ref name=GaiaDR2b/> | radius2 = {{Val|1.61|0.08|0.09}}<ref name=Bochanski2018/> | gravity2 = 4.29<ref name=starhorse/> | metal2_fe = {{Val|−0.01|0.17|0.15}}<ref name=Bochanski2018/> | age_gyr2 = {{Val|1.07|1.56|0.42}}<ref name=Bochanski2018/> }} {{Starbox catalog | names = {{odlist | B=N Cen | CCDM=J13521-5249 | WDS=J13521-5249 }}<ref name=SIMBAD_A/> | component1 = A | names1 = {{odlist | CPD=−52°6787 | HR=5207 | HD=120642 | HIP=67703 | SAO=241239 | GC=18720 }}<ref name=SIMBAD_A/> | component2 = B | names2 = {{odlist | HD=120641 | HIP=67702 | SAO=241238 | GC=18718 | CD=−52°5831 }}<ref name=SIMBAD_B/> }} {{Starbox reference | Simbad = HD+120642 |sn=A | Simbad2 = HD+120641 |sn2=B }} {{Starbox end}}
'''N Centauri''' is a [[binary star]]<ref name=Eggleton2008/> in the southern [[constellation]] of [[Centaurus]]. The brighter star is dimly visible to the naked eye with an [[apparent visual magnitude]] of 5.26, and it is approximately 304 [[light year]]s away based on [[stellar parallax|parallax]]. It has an [[absolute magnitude]] of +0.76 and is drifting further away from the [[Sun]] with a [[radial velocity]] of +27 km/s. It is a candidate member of the [[Sco OB2]] moving group.<ref name=Rizzuto2011/>
The double nature of this system was discovered by German astronomer [[Carl Ludwig Christian Rümker|Carl Rümker]] in 1835. As of 2016, the companion lay at an [[angular separation]] of {{Val|18.5|ul=arcsecond}} along a [[position angle]] of 289° from the primary.<ref name=WDSC2014/> They form a co-moving pair with a projected separation of {{Val|1566|ul=AU|fmt=commas}}.<ref name=lindroos1985/> The more luminous member is a [[B-type main-sequence star]] with a [[stellar classification]] of B9V.<ref name=Eggleton2008/> Its fainter companion is an [[F-type main-sequence star]] with a class of F0Vn, where the 'n' suffix indicates that the metal [[absorption line]]s in its spectrum are unusual broad ("nebulous") and indicative of rapid rotation.<ref name=skiff2014/><ref name=lindroos1983/> Based upon discrepancies in the proper motion measurements, there are hints of a third member of this system.<ref name=Eggleton2008/>
== References == {{Reflist|colwidth=30em|refs=
<ref name=GaiaDR2b>{{cite DR2|6065984179910876032}}</ref>
<ref name=dr3a>{{cite Gaia DR3|6065984557860591360}}</ref>
<ref name=dr3b>{{cite Gaia DR3|6065984179910876032}}</ref>
<ref name=SIMBAD_A>{{cite simbad | title=N Cen | access-date=2020-03-03}}</ref>
<ref name=SIMBAD_B>{{cite simbad | title=HD 120641 | access-date=2020-03-03}}</ref>
<ref name=constellation>{{cite constellation|N Cen}}</ref>
<ref name=xhipa>{{cite XHIP|67703}}</ref>
<ref name=xhipb>{{cite XHIP|67702}}</ref>
<ref name=Eggleton2008>{{citation | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869–879 | date=September 2008 | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | s2cid=14878976 | postscript=. }}</ref>
<ref name=David2015>{{citation | last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A. | title=The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets | journal=The Astrophysical Journal | volume=804 | issue=2 | pages=146 | year=2015 | bibcode=2015ApJ...804..146D | arxiv=1501.03154 | doi=10.1088/0004-637X/804/2/146 | s2cid=33401607 | postscript=. }}</ref>
<ref name=Bochanski2018>{{citation | title=Fundamental Properties of Co-moving Stars Observed by Gaia | last1=Bochanski | first1=John J. | last2=Faherty | first2=Jacqueline K. | last3=Gagné | first3=Jonathan | last4=Nelson | first4=Olivia | last5=Coker | first5=Kristina | last6=Smithka | first6=Iliya | last7=Desir | first7=Deion | last8=Vasquez | first8=Chelsea | display-authors=1 | journal=The Astronomical Journal | volume=155 | issue=4 | id=149 | pages=17 | date=April 2018 | arxiv=1801.00537 | bibcode=2018AJ....155..149B | doi=10.3847/1538-3881/aaaebe | s2cid=119256051 | postscript=. | doi-access=free }}</ref>
<ref name=Rizzuto2011>{{citation | display-authors=1 | last1=Rizzuto | first1=Aaron | last2=Ireland| first2=Michael | last3=Robertson | first3=J. G. | title=Multidimensional Bayesian membership analysis of the Sco OB2 moving group | journal=Monthly Notices of the Royal Astronomical Society | date=October 2011 | volume=416 | issue=4 | pages=3108–3117 | bibcode=2011MNRAS.416.3108R | arxiv=1106.2857 | doi=10.1111/j.1365-2966.2011.19256.x | doi-access=free | s2cid=54510608 | postscript=. }}</ref>
<ref name=WDSC2014>{{citation | display-authors=1 | last1=Mason | first1=B. D. | last2=Wycoff | first2=G. L. | last3=Hartkopf | first3=W. I. | last4=Douglass | first4=G. G. | last5=Worley | first5=C. E. | title=The Washington Visual Double Star Catalog | journal=The Astronomical Journal | year=2014 | volume=122 | issue=6 | page=3466 | bibcode=2001AJ....122.3466M | doi=10.1086/323920 | url=https://vizier.u-strasbg.fr/viz-bin/VizieR?-source=B/wds | access-date=2015-07-22 | doi-access=free }}</ref>
<ref name=lindroos1985>{{citation | last=Lindroos | first=K. P. | postscript=. | title=A study of visual double stars with early type primaries. IV Astrophysical data | journal=Astronomy and Astrophysics Supplement Series | volume=60 | pages=183 | year=1985 | bibcode=1985A&AS...60..183L }}</ref>
<ref name=skiff2014>{{citation |postscript=. |bibcode=2014yCat....1.2023S |title=VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009- ) |last1=Skiff |first1=B. A. |journal=VizieR On-line Data Catalog |year=2014 }}</ref>
<ref name=lindroos1983>{{citation |postscript=. |bibcode=1983A&AS...51..143G |title=A study of visual double stars with early type primaries. I. Spectroscopic results |last1=Gahm |first1=G. F. |last2=Ahlin |first2=P. |last3=Lindroos |first3=K. P. |journal=Astronomy and Astrophysics Supplement Series |volume=51 |pages=143 |year=1983 }}</ref>
<ref name=tic>{{citation | postscript=. |bibcode=2019AJ....158..138S |title=The revised TESS Input Catalog and Candidate Target List |author=Stassun K.G.| display-authors=etal |date=October 2019 | journal=[[The Astronomical Journal]] |volume=158 |issue=4 |page=138 |arxiv=1905.10694 |doi=10.3847/1538-3881/ab3467 |s2cid=166227927 |doi-access=free }}</ref>
<ref name=starhorse>{{Citation|postscript=.|last1=Anders|first1=F.|last2=Khalatyan|first2=A.|last3=Chiappini|first3=C.|last4=Queiroz|first4=A. B.|last5=Santiago|first5=B. X.|last6=Jordi|first6=C.|last7=Girardi|first7=L.|last8=Brown|first8=A. G. A.|last9=Matijevic|first9=G.|last10=Monari|first10=G.|last11=Cantat-Gaudin|first11=T.|date=2019-08-01|title=Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18|bibcode=2019A&A...628A..94A|journal=Astronomy and Astrophysics|volume=628|pages=A94|doi=10.1051/0004-6361/201935765|arxiv=1904.11302|s2cid=131780028|issn=0004-6361}}</ref>
}}
{{Stars of Centaurus}}
[[Category:B-type main-sequence stars]] [[Category:F-type main-sequence stars]] [[Category:Double stars]] [[Category:Bayer objects|Centauri, N]] [[Category:Durchmusterung objects]] [[Category:Centaurus]] [[Category:Henry Draper Catalogue objects|120642]] [[Category:Hipparcos objects|067703]] [[Category:Bright Star Catalogue objects|5207]]