HD 121504 b

HD 121504 b is an exoplanet that is likely to be slightly less massive than Jupiter. Although the radial velocity method that was used to detect the planet can only measure the minimum mass of the planet, it is very unlikely that its true mass would be much higher.^[1]

HD 121504 b

Discovery
Discovered by	Mayor et al.
Discovery site	La Silla Observatory
Discovery date	August 7, 2000
Detection method	Radial velocity (CORALIE)
Designations
Alternative names	HIP 68162 b
Orbital characteristics
Apastron	0.34 50 Gm
Periastron	0.32 48 Gm
Semi-major axis	0.33 AU 49 Gm
Eccentricity	0.03 ± 0.01
Orbital period (sidereal)	63.33 ± 0.03 d 0.1734 year
Angular distance	7 mas
Longitude of periastron	265° ± 12°
Time of periastron	2,451,450 ± 2 JD
Semi-amplitude	50.8 ± 0.9 m/s
Star	HD 121504
Physical characteristics
Mass	>1.22 MJ >388 ME

HD 121504 b orbits the star at a distance of about one third of Earth's distance from the Sun, and has a slightly eccentric orbit.