The TOI-2257 system contains 1 exoplanet. It is located 188.49 light years away from the solar system.
| Mass | 0.33 solar masses |
| Radius | 0.31 solar radiae |
| Temperature | 3430 kelvin |
| Stellar Metallicity | -0.27 decimal exponent |
| Age | - billion years |
At more than 10 Earth masses, TOI-2257 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 | 5.450 Earth masses |
| Density | 2.840 grams per cubic centimeter |
| Radius | 2.194 Earth radiae |
| Semi-major Axis | 0.145 AU |
| Eccentricity | 0.496 |
| Orbital Period | 35.189 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 | 2022-01 |
| Reference | Schanche et al. 2022 |