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HD 121504 is a star with an orbiting exoplanet in the southern constellation of Centaurus. It is located at a distance of 136 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of 19.6 km/s.<ref name=Soubiran_et_al_2018/> With an apparent visual magnitude of 7.54,<ref name=Anderson_Francis_2012/> this star is too faint to be visible to the naked eye. It shows a high proper motion, traversing the celestial sphere at an angular rate of Template:Val.<ref name=Luyten1995/>
The spectrum of this star presents as an ordinary G-type main-sequence star, a yellow dwarf similar in appearance to the Sun, having a stellar classification of G2V.<ref name=Houk1979/> It is roughly two billion years old and is spinning with a rotation period of 8.6 days. The star has 16% more mass than the Sun and a 15% greater radius.<ref name=Bonfanti_et_al_2016/> The metallicity (the abundance of elements more massive than helium) is higher than solar.<ref name="Mayor2004"/> The star is radiating 162% of the luminosity of the Sun from its photosphere at an effective temperature of 6,089 K.<ref name=Bonfanti_et_al_2016/>
A nearby visual companion, designated as SAO 241323 has been proposed as a component of the system. However, the pair form an optical binary with an angular separation of Template:Val,<ref name="Mayor2004"/> and in reality this is a white giant star located thousands of light years away.Template:Cn
ExoplanetEdit
In 2000 the Geneva Extrasolar Planet Search Team announced the discovery of an extrasolar planet orbiting the star.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>
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