HD 23596 b

HD 23596 b is an exoplanet approximately 170 light years away in the constellation Perseus. The planet is very massive, with a minimum mass 7.8 times that of Jupiter, classifying it as mid-superjovian. Based on its mass, the planet would probably be a gas giant with no solid surface. The planet orbits at the average distance of 2.83 AU, taking 1565 days to complete its orbit with average velocity of 19.7 km/s. The eccentricity of the planet's orbit is higher than all the planets in the Solar System, bringing as close as 2.00 AU to as far as 3.66 AU from the parent star.[2]

HD 23596 b

Discovery
Discovered by	Perrier et al.
Discovery site	Haute-Provence Observatory
Discovery date	June 2002
Detection method	radial velocity
Orbital characteristics[1]
Semi-major axis	2.694+0.107 −0.118 AU
Eccentricity	0.282+0.017 −0.014
Orbital period (sidereal)	4.203+0.021 −0.025 yr
Inclination	38.898°+15.759° −77.179°
Longitude of ascending node	16.684°+148.950° −21.642°
Time of periastron	2450036.142+18.541 −15.360
Argument of periastron	264.570°+3.372° −3.544°
Semi-amplitude	128.315+2.480 −2.670 m/s
Star	HD 23596
Physical characteristics[1]
Mass	11.914+0.990 −1.768 MJ

The planet was discovered by Perrier et al. in 2002 using the radial velocity technique to look for changes in inward (blue-shifting) and outward (red-shifting) radial stellar motion in the sky.[2] In 2022, the inclination and true mass of HD 23596 b were measured via astrometry.[1]