L 98-59 b
Description: L 98-59 b is an exoplanet having a size between that of the Earth and Mars and a mass only half that of Venus. It orbits L 98-59, a red dwarf star 34.6 light-years away in the constellation Volans. There are at least 3 other planets in the system: L 98-59 c, d, e, and the unconfirmed L 98-59 f. Its discovery was announced on 27 June 2019 in The Astronomical Journal and in a NASA press release. It was the smallest planet discovered by TESS until the discovery of LHS 1678 b, and was the lowest-mass planet whose mass had been measured using radial velocities until Proxima Centauri d was found in 2022.
Physical Properties
Mass (Jupiter mass): 0.00125854074459745 MJ
Radius (Jupiter radius): 0.076 RJ
Density: 3.6 g/cm³
Equilibrium Temperature: 627.0 K
Orbital Parameters
Orbital Period: 2.2531136 days
Semi-major Axis: 0.02191 AU
Eccentricity: 0.103
Inclination: 87.71°
Host Star Properties
Host Star: L 98-59
Spectral Type: M3 V
Temperature: 3415.0 K
Stellar Mass: 0.27 M☉
Stellar Radius: 0.3 R☉
Discovery Information
Planet Letter: b
Object ID: 3.12372
Host ID: 2.103986
Discovery Date: 2019-07
Discovery Year: 2019
Discovery Method: Transit
Discovery Locale: Space
Discovery Facility: Transiting Exoplanet Survey Satellite (TESS)
Discovery Instrument: TESS CCD Array