23 Librae b

23 Librae b (23 Lib b), also known as HD 134987 b, is an extrasolar Jovian planet discovered in November 1999 orbiting the star 23 Librae. It orbits in its star's habitable zone.^[1][2][3]

23 Librae b

23 Librae b (min mass ~1.59 MJ) as seen with Celestia
Discovery[1][2]
Discovered by	California and Carnegie Planet Search
Discovery site	W. M. Keck Observatory
Discovery date	November 1, 1999
Detection method	Doppler spectroscopy
Orbital characteristics
Semi-major axis	0.81 ± 0.02 AU (121,200,000 ± 3,000,000 km)
Eccentricity	0.233 ± 0.002
Orbital period (sidereal)	258.19 ± 0.07 d 0.7069 y
Time of periastron	2,450,331.7 ± 2.2
Argument of periastron	358.3 ± 3.7
Semi-amplitude	49.52 ± 0.57
Star	23 Librae

As of 1999, the planet was known to have at least 1.5 times Jupiter's mass. The planet orbits 23 Librae at an average distance of 0.82 AU, which is between that of Venus and the Earth in the Solar System.^[4]

See also

• List of exoplanets discovered before 2000