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Sigma Octantis
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{{short description|Star in the constellation Octans}} {{Starbox begin | name = Sigma Octantis }} {{Starbox image | image = {{Location mark | image=Octans IAU.svg | alt= | float=center | width=250 | label= | position=right | mark=Red circle.svg | mark_width=10 | mark_link=Ο Oct | x=364 | y=484 }} | caption=Location of Ο Octantis (circled) }} {{Starbox observe | epoch = [[J2000.0]] | equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]]) | constell = [[Octans]] | ra = {{RA|21|08|46.86357}}<ref name=dr3/> | dec = {{DEC|β88|57|23.3983}}<ref name=dr3/> | appmag_v = 5.47<ref name=Johnson1966/> }} {{Starbox character | class = F0 IV<ref name=houk1975/> | b-v = +0.26<ref name=Johnson1966/> | u-b = +0.13<ref name=Johnson1966/> | variable = [[Delta Scuti variable|Ξ΄ Sct]]<ref name=Rodriguez2000/> }} {{Starbox astrometry | radial_v = +11.9<ref name=Wilson1953/> | prop_mo_ra = +26.323<ref name=dr3/> | prop_mo_dec = +4.721<ref name=dr3/> | parallax = 11.1005 | p_error = 0.0616 | parallax_footnote = <ref name=dr3/> | absmag_v = {{Val|0.86|0.09}}<ref name=Antonello1997/> }} {{Starbox detail | source = | mass = 1.59<ref name=David2015/> | radius = 4.4<ref name=dr3/> | luminosity = 44<ref name=dr3/> | temperature = {{Val|7415|252|fmt=commas}}<ref name=David2015/> | gravity = 3.71<ref name=David2015/> | metal_fe = β0.5<ref name=dr3/> | rotational_velocity = 145<ref name=Rodriguez2000/> | age_myr = 912<ref name=David2015/> }} {{Starbox catalog | names = {{odlist | name=Polaris Australis | B=Ο Oct | CP=β89Β°47 | FK5=923 | HD=177482 | HIP=104382 | HR=7228 | SAO=258857 }}<ref name=SIMBAD/> }} {{Starbox reference | Simbad = HD+177482 }} {{Starbox end}} '''Sigma Octantis''' is a solitary<ref name=Eggleton2008/> [[star]] in the [[Octans]] [[constellation]] that forms the [[pole star]] of the [[southern celestial hemisphere|Southern Hemisphere]]. Its name is also written as '''Ο Octantis''', abbreviated as '''Sigma Oct''' or '''Ο Oct''', and it is officially named '''Polaris Australis''' ({{IPAc-en|p|ou|'|l|ΙΙr|I|s|_|ΙΛ|'|s|t|r|ei|l|I|s}}).<ref name="IAU-LSN"/> The star is positioned one degree away from the southern [[celestial pole]] of the [[southern celestial hemisphere|Southern Hemisphere]], lying in nearly opposite direction to the [[North Star]] on the [[celestial sphere]]. Located approximately {{val|294|ul=light-years}} from Earth, it is classified as a [[subgiant]] with a [[Stellar classification#Spectral types|spectral type]] of F0 IV. Sigma Octantis has an [[apparent magnitude]] of 5.5, but is slightly variable and is classified as a [[Delta Scuti variable]].
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