The L 98-59 system contains 4 exoplanets. It is located 34.64 light years away from the solar system.
| Mass | 0.27 solar masses |
| Radius | 0.3 solar radiae |
| Temperature | 3415 kelvin |
| Stellar Metallicity | -0.46 decimal exponent |
| Age | 0.8 billion years |
At less than 1.5 Earth masses, L 98-59 b is a terrestrial planet, much like the terrestrial planets we find in our solar system, namely Mercury, Venus, Earth and Mars.
| Mass | 0.400 Earth masses |
| Density | 3.600 grams per cubic centimeter |
| Radius | 0.850 Earth radiae |
| Semi-major Axis | 0.02191 AU |
| Eccentricity | 0.103 |
| Orbital Period | 2.253 days |
| Discovery Method | Transit |
| Discovery Facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery Telescope | 0.1 m TESS Telescope |
| Discovery Instrument | TESS CCD Array |
| Discovery Date | 2019-07 |
| Reference | Kostov et al. 2019 |
At 2.220 Earth masses, L 98-59 c is a so called Super Earth. Super Earths could be terrestrial worlds like Earth, but they could also be ocean worlds or terrestrial worlds wrapped in a substantial atmosphere, in which case some refer to them as Mini Neptunes.
| Mass | 2.220 Earth masses |
| Density | 4.570 grams per cubic centimeter |
| Radius | 1.385 Earth radiae |
| Semi-major Axis | 0.0304 AU |
| Eccentricity | 0.103 |
| Orbital Period | 3.691 days |
| Discovery Method | Transit |
| Discovery Facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery Telescope | 0.1 m TESS Telescope |
| Discovery Instrument | TESS CCD Array |
| Discovery Date | 2019-07 |
| Reference | Kostov et al. 2019 |
With a mass below 5 Earth masses, a density of 2.95, and a semi-major axis of 0.0486 astronomical units, L 98-59 d could, potentially, be an ocean world - a planet with no dry land.
| Mass | 1.940 Earth masses |
| Density | 2.950 grams per cubic centimeter |
| Radius | 1.521 Earth radiae |
| Semi-major Axis | 0.0486 AU |
| Eccentricity | 0.074 |
| Orbital Period | 7.451 days |
| Discovery Method | Transit |
| Discovery Facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery Telescope | 0.1 m TESS Telescope |
| Discovery Instrument | TESS CCD Array |
| Discovery Date | 2019-07 |
| Reference | Kostov et al. 2019 |
At 3.062 Earth masses, L 98-59 e is a so called Super Earth. Super Earths could be terrestrial worlds like Earth, but they could also be ocean worlds or terrestrial worlds wrapped in a substantial atmosphere, in which case some refer to them as Mini Neptunes.
| Mass | 3.060 Earth masses |
| Density | 4.430 grams per cubic centimeter |
| Radius | 1.560 Earth radiae |
| Semi-major Axis | 0.0717 AU |
| Eccentricity | 0.128 |
| Orbital Period | 12.796 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | Multiple Observatories |
| Discovery Telescope | Multiple Telescopes |
| Discovery Instrument | Multiple Instruments |
| Discovery Date | 2021-09 |
| Reference | Demangeon et al. 2021 |