Epsilon Circini
{{Short description|Star in the constellation Circinus}}
{{Starbox begin
| name = ε Circini
}}
{{Starbox observe
| epoch = J2000.0
| constell = Circinus
| dec = {{DEC|−63|36|37.6831}}
}}
{{Starbox character
| r-i =
| variable =
}}
{{Starbox astrometry
| radial_v = {{Val|−3.72|0.42}}
| parallax = 7.5809
| p_error = 0.1085
}}
{{Starbox detail
| source =
| metal_fe =
| rotational_velocity =
| age_myr =
}}
{{Starbox catalog
| names = {{odlist | B=ε Cir | CPD=−63°3544 | FK5=3205 | HD=135291 | HIP=74837 | HR=5666 | SAO=253088 }}
}}
{{Starbox reference
| Simbad = eps+Cir
}}
{{Starbox end}}
Epsilon Circini, Latinized from ε Circini, is a solitary star located in the southern constellation of Circinus. It is faintly visible to the naked eye, having an apparent visual magnitude of 4.86. The distance to this star, as determined by a measured annual parallax shift of {{val|7.63|ul=mas}}, is around 430 light years. It is drifting closer to the Sun with a radial velocity of −4 km/s.
This is an evolved K-type giant star with a stellar classification of K2.5 III. With the supply of hydrogen at its core exhausted, the star has cooled and expanded to 24 times the girth of the Sun. It radiates about 338 times the solar luminosity from its photosphere at an effective temperature of {{val|fmt=commas|4,767|ul=K}}.
References
{{reflist|refs=
{{Cite Gaia DR3|5873439421661664128}}
| 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 | s2cid=119257644 | postscript=. }}
| title=Spectral Types on the MK System for Forty-Three Bright Southern Stars, K2-M6
| last1=Landi Dessy | first1=J. | last2=Keenan | first2=P. C.
| journal=Astrophysical Journal | postscript=.
| volume=146 | pages=587 | date=November 1966
| doi=10.1086/148925 | bibcode=1966ApJ...146..587L | doi-access=free }}
| 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
| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free
| bibcode=2008MNRAS.389..869E
| arxiv=0806.2878 | s2cid=14878976
| postscript=. }}
| last1=Johnson | first1=H. L. | last2=Iriarte | first2=B.
| last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z.
| display-authors = 1 | title=UBVRIJKL photometry of the bright stars
| journal=Communications of the Lunar and Planetary Laboratory
| volume=4 | issue=99 | year=1966
| page=99 | bibcode=1966CoLPL...4...99J | postscript = . }}
| title=eps Cir -- Star
| work=SIMBAD Astronomical Database
| publisher=Centre de Données astronomiques de Strasbourg
| url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=eps+Cir
| accessdate=2017-01-18 | postscript=. }}
}}
{{Stars of Circinus|state=collapsed}}
{{DEFAULTSORT:Epsilon Circini}}