TOI-2257 b
| Discovery | |
|---|---|
| Discovered by | Schanche et al. |
| Discovery date | November 2021 |
| Transit | |
| Orbital characteristics | |
| 0.145±0.003 AU | |
| Eccentricity | 0.496+0.216 −0.133 |
| 35.189346(90) d | |
| Inclination | 89.786°+0.078° −0.062° |
| Star | TOI-2257 |
| Physical characteristics | |
| 2.194+0.113 −0.111 R🜨 | |
| Mass | 5.712+4.288 −2.311 M🜨 (predicted) |
| Temperature | 256+61 −17 K (−17 °C; 1 °F, equilibrium) |
TOI-2257 b is an extremely eccentric (0.496) exoplanet in or near the circumstellar habitable zone of the star TOI-2257, 188 light-years away. It is likely a sub-Neptune exoplanet, with a mass of 5.71 Mearth and a radius of 2.19 Rearth. As a small planet in the habitable zone, it is included in the Planetary Habitability Laboratory's list of potentially habitable exoplanets.