HD 181433 c

HD 181433 c is an extrasolar planet located approximately 87 light-years away^[4] in the constellation of Pavo, orbiting the star HD 181433. This planet is at least 0.64 times as massive as Jupiter and takes 962 days to orbit the star at an orbital distance of 1.76 astronomical units (AU), or 263 gigametres (Gm). The orbit is eccentric, however, and ranges from 1.27 AU (190 Gm) at periastron to 2.25 AU (337 Gm) at apastron.^[3] François Bouchy et al. have published a paper detailing the HD 181433 planetary system in Astronomy and Astrophysics.^[1]

HD 181433 c

Discovery
Discovered by	Bouchy et al.[1]
Discovery site	La Silla Observatory, Chile[2]
Discovery date	June 16, 2008[2]
Detection method	Doppler spectroscopy[2]
Orbital characteristics
Apastron	2.25 AU (337 million km)
Periastron	1.27 AU (190 million km)
Semi-major axis	1.76 AU (263 million km)[3]
Eccentricity	0.28 ± 0.02[3]
Orbital period (sidereal)	962 ± 15[3] d 2.63 y
Average orbital speed	20.0
Time of periastron	2,453,235 ± 7.3[3]
Argument of periastron	21.4 ± 3.2[3]
Star	HD 181433