TOI-257 is 251 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this 6,095 K star; the first was found in 2021 by transit (Transiting Exoplanet Survey Satellite (TESS)).
Fly there in 3DTOI-257 b goes round its star every 18.4 days, 5 times as often as Mercury goes round the Sun.
| Surface temperature | 6,095 K |
| Mass | 1.407 solar masses |
| Radius | 1.867 solar radii |
| Luminosity | 4.33 times the Sun |
| Apparent magnitude | 7.57 |
| Distance from the Sun | 250.8 light-years (76.9 parsecs) |
| Position (J2000) | RA 47.5173°, Dec -50.8323° |
| Constellation | Horologium |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| TOI-257 b | 18.4 days | 0.153 AU | 7.1625 R⊕ | 43.86 M⊕ | Transit, 2021 |
Values are the NASA Exoplanet Archive’s composite parameters. A radius marked estimated comes from a mass–radius relation; a mass marked minimum is M sin i. Planet sizes and colours in the 3D view are renderings: none of these worlds has been photographed as more than a point of light.