{{Short description|Variable star in the constellation Centaurus}} {{distinguish|Tau Centauri|Theta Centauri}} {{Starbox begin}} {{Starbox image | image = {{Location mark |image=Centaurus constellation map.svg|alt=|float=center|width=280 |label=|position=right |mark=Red circle.svg|mark_width=10|mark_link=T Centauri |x=470|y=250 }} | caption = Location of T Centauri (circled in red) }} {{Starbox observe | epoch = J2000.0 | constell = [[Centaurus (constellation)|Centaurus]] | ra = {{RA|13|41|45.56353}}<ref name=dr3/> | dec = {{DEC|-33|35|50.5600}}<ref name=dr3/> | appmag_v = 5.56{{snd}}8.44<ref name=AAVSOT/> }} {{Starbox character | type = [[asymptotic giant branch|AGB]] or [[Post-AGB star|post-AGB]]<ref name=AAVSOT/> | class = K0:e-M4II:e<ref name=AAVSOT/> | variable = [[Semiregular variable star|semiregular]]<ref name=gcvs/> }} {{Starbox astrometry | radial_v = {{val|+32.6|2.5}}<ref name=dr3/> | prop_mo_ra = −27.747 | prop_mo_dec = +3.365 | pm_footnote = <ref name=dr3/> | parallax = 2.4007 | p_error = 0.0687 | parallax_footnote = <ref name=dr3/> }} {{Starbox catalog | names={{odlist|V=T Cen|CD=-32°9549|HD=119090|HIP=66825|HR=5147|SAO=204739}}<ref name=SIMBAD/> }} {{Starbox reference|Simbad=T+Cen}} {{Starbox end}}
[[File:TCenLightCurve.png|thumb|left|A [[Photometric_system#Photometric_letters|visual band]] [[light curve]] for T Centauri, plotted from [[All Sky Automated Survey|''ASAS'']] data<ref name=ASASServer/>]] '''T Centauri''' is a [[variable star]] located in the far southern constellation [[Centaurus]]. It varies between magnitudes 5.56 and 8.44 over 181.4 days, making it intermittently visible to the [[naked eye]].<ref name=AAVSOT/> Pulsating between spectral classes K0:e and M4II:e, it has been classed as a [[semiregular variable]],<ref name=gcvs/> though Sebastian Otero of the [[American Association of Variable Star Observers]] has noted its curve more aligned with [[RV Tauri variable]] stars and has classified it as one.<ref name=AAVSOT/>
The variability of the star was discovered in 1894 by Ernest Elliott Markwick, and independently by [[Williamina Fleming]] in 1895.<ref name="Markwick1895"/><ref name="IVSI"/> {{clear left}} ==References== <references> <ref name=SIMBAD>{{cite simbad |title=T Centauri |access-date=2025-05-25 }}</ref>
<ref name=dr3>{{cite Gaia DR3|6165341341986059520}}</ref>
<ref name=gcvs>{{cite journal |bibcode=2017ARep...61...80S |title=General catalogue of variable stars: Version GCVS 5.1 |last1=Samus' |first1=N. N. |last2=Kazarovets |first2=E. V. |last3=Durlevich |first3=O. V. |last4=Kireeva |first4=N. N. |last5=Pastukhova |first5=E. N. |journal=Astronomy Reports |date=2017 |volume=61 |issue=1 |page=80 |doi=10.1134/S1063772917010085 }}</ref>
<ref name=AAVSOT>{{cite web|url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=7300 |title=T Centauri |author =Watson, Christopher |date=27 December 2012 |work=AAVSO Website|publisher=[[American Association of Variable Star Observers]]|access-date=22 July 2014}}</ref>
<ref name="Markwick1895">{{cite journal |last1=Markwick |first1=E. E. |title=Note on the variable star T Centauri, Cord. GC. 18609 |journal=Astronomische Nachrichten |date=July 1895 |volume=138 |issue=13 |page=213 |doi=10.1002/asna.18951381304 |bibcode=1895AN....138..213M }}</ref>
<ref name="IVSI">{{cite web |title=T Cen |url=https://www.aavso.org/vsx/index.php?view=detail.top&oid=7300 |website=The International Variable Star Index |publisher=AAVSO |access-date=19 December 2024}}</ref>
<ref name=ASASServer>{{cite web |title=ASAS All Star Catalogue |url=http://www.astrouw.edu.pl/asas/?page=aasc |publisher=The All Sky Automated Survey |access-date=8 December 2021}}</ref> </references>
{{Stars of Centaurus}}
[[Category:Centaurus]] [[Category:Semiregular variable stars]] [[Category:Objects with variable star designations|Centauri, T]] [[Category:Durchmusterung objects|CD-32 09549]] [[Category:Henry Draper Catalogue objects|119090]] [[Category:Hipparcos objects|066825]] [[Category:K-type giants]] [[Category:Bright Star Catalogue objects|5147]] [[Category:M-type bright giants]] [[Category:Asymptotic-giant-branch stars]] [[Category:RV Tauri variables]]
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