HD 142022 Ab

HD 142022 Ab is an exoplanet discovered by the radial velocity method by Eggenberger et al. in 2005, after finding that HD 142022 A is wobbling which indicated the presence of a massive planet, with a minimum mass 4.5 times Jupiter. It has a relatively wide separation between the planet and the star of nearly 3 AU, and takes 1928 days or 5.28 years to revolve. As is common for long-period planets, it has a relatively high eccentricity of 53±20%.^[1] In 2023, the inclination and true mass of HD 142022 Ab were determined via astrometry.^[2]

HD 142022 Ab

Discovery[1]
Discovered by	Eggenberger et al.
Discovery site	La Silla Observatory
Discovery date	14 February 2005
Detection method	Radial Velocity (CORALIE)
Orbital characteristics[2]
Semi-major axis	2.939±0.062 AU
Eccentricity	0.506+0.071 −0.06
Orbital period (sidereal)	1935+30 −27 d 5.297+0.082 −0.073 yr
Average orbital speed	16.6
Inclination	71°±13° or 109°±13°
Longitude of ascending node	141°±19°
Time of periastron	2456730+50 −44
Argument of periastron	168.5°+4.1° −5.0°
Semi-amplitude	92 ± 65
Star	HD 142022 A
Physical characteristics[2]
Mass	4.51+0.91 −0.61 MJ

See also

• HD 141937 b
• HD 142415 b