HR 5183 b

HR 5183 b is an exoplanet located 102.7 light years away in the constellation of Virgo orbiting the star HR 5183. It has a mass of 3.31 M_J.^[2] It has a highly eccentric (e≃0.87) orbit which takes it from within the orbit of Jupiter to beyond the orbit of Neptune (2.87 to 41.8 AU) which classifies it as an eccentric Jupiter and it has been nicknamed the "whiplash planet".^[3][1] It was discovered in 2019 based on two decades of radial velocity observations.^[1]

HR 5183

The planet's orbit and comparison to Jupiter
Discovery[1]
Discovered by	Blunt et al.
Discovery date	2019
Detection method	Radial velocity
Orbital characteristics[2]
Periastron	2.87±0.08 AU
Apoastron	41.8+22.1 −10.6 AU
Semi-major axis	22.3+11.0 −5.3 AU
Eccentricity	0.87±0.04
Orbital period (sidereal)	102+84 −34 yr
Inclination	89.9+13.3 −13.5
Longitude of ascending node	224.0+18.2 −20.3
Time of periastron	2458122±12
Argument of periastron	339.9±1.8
Semi-amplitude	38.4±0.6
Star	HR 5183
Physical characteristics[2]
Mass	3.31+0.18 −0.14 MJ

In 2021, astrometric observations revealed that HR 5183 b has a nearly edge-on orbital inclination, and thus its true mass is close to its minimum mass.^[2]

See also

• Eccentric Jupiter
• HD 80606 b
• HD 20782 b