Astronomy:HD 9578 b

Short description: Exoplanet in the constellation of Sculptor

HD 9578 b

Discovery
Discovered by	Segransan et al.
Discovery site	La Silla Observatory
Discovery date	October 19, 2009
Detection method	radial velocity (HARPS)
Orbital characteristics
Semi-major axis	1.27 AU (190,000,000 km)
Orbital period	494 d 1.35 y
Star	HD 9578

HD 9578 b is an extrasolar planet which orbits the G-type main sequence star HD 9578, located approximately 187 light years away in the constellation Sculptor. This planet has at least five-eighths the mass of Jupiter and takes four-thirds years to orbit the star at a semimajor axis of 1.27 AU. However unlike most other known exoplanets, its eccentricity is not known, but it is typical that its inclination is not known. This planet was detected by HARPS on October 19, 2009, together with 29 other planets.