The LP 791-18 system contains 2 exoplanets. It is located 86.41 light years away from the solar system.
| Mass | 0.14 solar masses |
| Radius | 0.17 solar radiae |
| Temperature | 2960 kelvin |
| Stellar Metallicity | -0.09 decimal exponent |
| Age | 0.5 billion years |
At less than 1.5 Earth masses, LP 791-18 b is a terrestrial planet, much like the terrestrial planets we find in our solar system, namely Mercury, Venus, Earth and Mars.
| Mass | 1.460 Earth masses |
| Density | 5.710 grams per cubic centimeter |
| Radius | 1.120 Earth radiae |
| Semi-major Axis | 0.00969 AU |
| Eccentricity | 0 |
| Orbital Period | 0.948 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 | 2019-09 |
| Reference | Crossfield et al. 2019 |
At more than 10 Earth masses, LP 791-18 c is an ice giant, a planet that is made up mostly of volatiles like water, amonia and methane, and enveloped by a dense hydrogen and helium atmosphere, much like Uranus and Neptune.
| Mass | 5.950 Earth masses |
| Density | 2.650 grams per cubic centimeter |
| Radius | 2.310 Earth radiae |
| Semi-major Axis | 0.029392 AU |
| Eccentricity | 0 |
| Orbital Period | 4.990 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 | 2019-09 |
| Reference | Crossfield et al. 2019 |