The TOI-421 system contains 2 exoplanets. It is located 243.95 light years away from the solar system.
| Mass | 0.85 solar masses |
| Radius | 0.87 solar radiae |
| Temperature | 5325 kelvin |
| Stellar Metallicity | -0.02 decimal exponent |
| Age | 9.4 billion years |
At more than 10 Earth masses, TOI-421 b 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 | 7.170 Earth masses |
| Density | 2.050 grams per cubic centimeter |
| Radius | 2.680 Earth radiae |
| Semi-major Axis | 0.056 AU |
| Eccentricity | 0.163 |
| Orbital Period | 5.197 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 | 2020-09 |
| Reference | Carleo et al. 2020 |
At more than 10 Earth masses, TOI-421 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 | 16.420 Earth masses |
| Density | 0.685 grams per cubic centimeter |
| Radius | 5.090 Earth radiae |
| Semi-major Axis | 0.1189 AU |
| Eccentricity | 0.152 |
| Orbital Period | 16.068 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 | 2020-09 |
| Reference | Carleo et al. 2020 |