NOTABLE STARS EXTRASOLAR PLANETS A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site Iota Horologii Dust disk around Iota Horologii Also known as HR 810, a Sun-like star with an extrasolar planet 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 miles) Orbital period 320 days Eccentricity 0.16 Discovery 1999, ESO Coudé Échelle Spectrometer, La Silla Method of discovery radial velocity Related categories    • NOTABLE STARS    • EXTRASOLAR PLANETS AND SUBSTELLAR OBJECTS Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP