The TOI-257 system contains 1 exoplanet. It is located 250.82 light years away from the solar system.
| Mass | 1.41 solar masses |
| Radius | 1.87 solar radiae |
| Temperature | 6095 kelvin |
| Stellar Metallicity | 0.175 decimal exponent |
| Age | - billion years |
At more than 10 Earth masses, TOI-257 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 | 43.860 Earth masses |
| Density | 0.650 grams per cubic centimeter |
| Radius | 7.163 Earth radiae |
| Semi-major Axis | 0.1528 AU |
| Eccentricity | 0 |
| Orbital Period | 18.388 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 | 2021-04 |
| Reference | Addison et al. 2021 |