Iota Horologii, also known as HR 810, is a Sun-like star with an exoplanet that moves in the most Earth-like orbit yet found. Iota Horologii has a surface temperature of 6150 K and a mass 1.25 times that of the Sun. It is believed to be about 625 million years old and is more metal-rich than the Sun by about 50%. It has drifted to its present position from the Hyades cluster where it formed.

 

Host star
distance	50.5 light-years (15.5 pc)
spectral type	G0 V
apparent magnitude	5.4

 

Planet
mass (Jupiter=1)	2.26
semi-major axis	0.93 AU (140 million km, 86 million mi)
orbital period	320 days
eccentricity	0.16
discovery	1999, ESO Coudé Échelle Spectrometer, La Silla
method of discovery	radial velocity