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Iota Horologii
Iota Horologii (ι Hor, ι Horologii) is a solar twin, yellow dwarf star approximately 56 light-years away〔 in the Horologium constellation. The star is classified as a G0Vp〔 yellow dwarf (it has previously been classified as G3 and a subgiant ()). It has a mass and radius larger than the Sun, and is about 50% more luminous.
In 1999, a planet of the star was discovered.〔 Because the planet orbits in a near Earth orbit, Iota Horologii was ranked 69th in the list of candidates for NASA's planned Terrestrial Planet Finder mission. In 2000, a dust disc was announced around the star, but this was later determined to be an instrumental artifact.〔
== Distance and visibility ==
Since Iota Horologii is in the minor constellation of Horologium and is quite dim in the sky, it has not been given a traditional name. It lies roughly between the stars Eta Horologii and R Horologii (though it is not close to them in real space).
In its current position, Iota Horologii is closest to the star Chi Eridani (a yellow subgiant), approximately 7 light-years away. The closest planetary systems to Iota Horologii are HD 10647 (a yellow dwarf), approximately 9 light-years away, and Epsilon Reticuli (an orange subgiant), approximately 16 light-years away. Other star systems close to Iota Horologii include Nu Phoenicis and Zeta Reticuli.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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