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{{Starbox begin
| name=Eta Centauri
}}{{Starbox image
| image={{Location mark
|image=Centaurus constellation map.svg|alt=|float=center|width=280
|label=|position=right
|mark=Red circle.svg|mark_width=12|mark_link=Eta Centauri|x=254|y=461
}}
|caption=Location of η Centauri (circled)}}{{Starbox observe
| constell = Centaurus
| epoch = J2000.0
| ra = {{RA|14|35|30.42416}}
| dec = {{DEC|−42|09|28.1708}}
| appmag_v = +2.35[3] {{nowrap|(2.30 - 2.41[1])}}
}}{{Starbox character
| class = B1.5 Vne[5]
| b-v = −0.215[3]
| u-b = −0.862[3]
| variable = GCAS[1] + LERI
}}{{Starbox astrometry
| radial_v = –0.2[9]
| prop_mo_ra = −34.73
| prop_mo_dec = −32.72
| parallax = 10.67
| p_error = 0.21
| parallax_footnote =
| absmag_v = −2.53[13]
}}{{Starbox detail
| mass = {{nowrap|12.0 ± 0.3}}[14]
| radius = 5-6 [2]
| luminosity = 8,700[5]
| temperature = 25,700[5]
| metal_fe =
| gravity = 3.20[18]
| age_myr = {{nowrap|5.6 ± 1.0}}[14]
| rotational_velocity = 330[5]
}}{{Starbox catalog
| names = η Cen, CD−41°8917, CPD−41°6839, FK5 537, HD 127972, HIP 71352, HR 5440, SAO 225044.[21]
}}{{Starbox reference
| Simbad=HD+127972
}}{{Starbox end}}Eta Centauri, Latinized from η Centauri, is a star in the southern constellation of Centaurus. It has an apparent visual magnitude of +2.35[3] and is located at a distance of around {{Convert|306|ly|pc|abbr=off|lk=on}}.[ In traditional Chinese astronomy, Eta Centauri was known as {{lang|zh|庫樓二}}[3] (meaning: the Second (Star) of Koo Low).[25]]The stellar classification of this star is B1.5 Vne,[5] indicating that it is a B-type main sequence star. The 'n' suffix means that the absorption lines are broadened from rapid rotation. It has a projected rotational velocity of 330 km s−1[5] and completes a full rotation in less than a day. This is a Be star as shown by the 'e' suffix,[28] which means it has variable emissions in its hydrogen spectral lines. This emission can be modeled by a decretion disk of gas that has been ejected from the star and now follows a near Keplerian orbit around the central body.[29] Finally it is slightly variable, and classified as a Gamma Cassiopeiae variable star with multiple periods of variability.[1] The International Variable Star Index lists Eta Centauri as both a Gamma Cassiopeiae variable and a Lambda Eridani variable.[4] Eta Centauri has about 12[14] times the mass of the Sun, placing it above the dividing line between stars that evolve into white dwarfs and those that turn into supernovae. It is radiating 8,700[5] times as much luminosity as the Sun from its outer atmosphere at an effective temperature of 25,700 K.[5] This heat causes the star to glow with the blue-white hue common to B-type stars.[35] Eta Centauri is a proper motion member of the Upper-Centaurus Lupus sub-group in the Scorpius-Centaurus OB association, the nearest such co-moving association of massive stars to the Sun.[18] See also - Centaurus (Chinese astronomy)
References 1. ^1 2 {{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007–2013)|journal=VizieR On-line Data Catalog: B/gcvs. |volume=1|pages=02025|author1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009|display-authors=etal}}
2. ^{{cite web | title=ETA CEN (Eta Centauri) | publisher=University of Illinois | first1=James B. | last1=Kaler | url=http://stars.astro.illinois.edu/sow/etacen.html | accessdate=2018-09-16}}
3. ^{{zh icon}} 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, {{ISBN|978-986-7332-25-7}}.
4. ^{{cite journal|bibcode= 2006SASS...25...47W|title= The International Variable Star Index (VSX)|journal= The Society for Astronomical Sciences 25th Annual Symposium on Telescope Science. Held May 23–25|volume= 25|pages= 47|author1= Watson|first1= C. L.|year= 2006}}
5. ^1 {{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | postscript=. }}
6. ^1 2 3 4 5 6 7 8 {{citation | last1=Balona | first1=L. A. | last2=Dziembowski | first2=W. A. | title=Excitation and visibility of high-degree modes in stars | journal=Monthly Notices of the Royal Astronomical Society | volume=309 | issue=1 | pages=221–232 |date=October 1999 | doi=10.1046/j.1365-8711.1999.02821.x | bibcode=1999MNRAS.309..221B }}
7. ^1 {{citation | last1=Allen | first1=R. H. | date=1963 | title=Their Lore and Meaning | edition=Reprint | publisher=Dover Publications Inc. | location=New York, NY | isbn=0-486-21079-0 | page=154}}
8. ^1 {{citation | display-authors=3 | name-list-format=vanc | author=Janot-Pacheco | author2=E. | last3=Leister | first3=N. V. | last4=Hubert | first4=A. M. | last5=Floquet | first5=M. | date=1999 | title=Multi-periodicity of the Be star η Centauri from spectroscopic and photometric observations | journal=Astronomy and Astrophysics Supplement Series | volume=137 | issue=3 | pages=407 | bibcode=1999A&AS..137..407J | doi=10.1051/aas:1999256 }}
9. ^1 2 {{citation | last1=de Geus | first1=E. J. | last2=de Zeeuw | first2=P. T. | last3=Lub | first3=J. | title=Physical parameters of stars in the Scorpio-Centaurus OB association | journal=Astronomy and Astrophysics | volume=216 | issue=1–2 | pages=44–61 |date=June 1989 | bibcode=1989A&A...216...44D }}
10. ^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 }}
11. ^1 {{citation | display-authors=1 | title=Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions | journal=Veröff. Astron. Rechen-Inst. Heidelb | volume=35 | last1=Wielen | first1=R. | last2=Schwan | first2=H. | last3=Dettbarn | first3=C. | last4=Lenhardt | first4=H. | last5=Jahreiß | first5=H. | last6=Jährling | first6=R. | publisher=Astronomisches Rechen-Institut Heidelberg | issue=35 | date=1999 | bibcode=1999VeARI..35....1W }}
12. ^1 2 3 4 {{citation | last1=Gutierrez-Moreno | first1=Adelina | last2=Moreno | first2=Hugo | title=A photometric investigation of the Scorpio-Centaurus association | journal=Astrophysical Journal Supplement Series | volume=15 | page=459 |date=June 1968 | bibcode=1968ApJS...15..459G | doi=10.1086/190168 }}
13. ^1 {{cite simbad | title=eta Cen | accessdate=2012-03-03 }}
14. ^1 {{citation |title=The Colour of Stars |date=December 21, 2004 |work=Australia Telescope, Outreach and Education |publisher=Commonwealth Scientific and Industrial Research Organisation |url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |accessdate=2012-01-16 |deadurl=yes |archiveurl=https://www.webcitation.org/6630AbtJZ?url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |archivedate=2012-03-10 |df= }}
15. ^1 {{citation | last1=Silaj | first1= J. | last2=Jones | first2=C. E. | last3=Tycner | first3=C. | last4=Sigut | first4=T. A. A. | last5=Smith | first5=A. D. | title=A Systematic Study of Hα Profiles of Be Stars | journal=Astrophysical Journal Supplement Series | volume=187 | issue=1 | pages=228–250 |date=March 2010 | doi=10.1088/0067-0049/187/1/228 | bibcode=2010ApJS..187..228S }}
[5][6][7][8][9][10][11][12][13][14][15]
}} External links - [https://web.archive.org/web/20060206210545/http://www.astro.uiuc.edu/~kaler/sow/etacen.html Eta Centauri] by Jim Kaler.
{{Stars of Centaurus}} 11 : Centaurus (constellation)|Bayer objects|Be stars|Gamma Cassiopeiae variable stars|B-type main-sequence stars|Henry Draper Catalogue objects|Upper Centaurus Lupus|Lambda Eridani variables|Hipparcos objects|HR objects|Durchmusterung objects |