TOI-257 b
A confirmed exoplanet orbiting TOI-257.
Compared with Earth
- Size
- About 7.2 times Earth's width.
- Mass
- About 44 times Earth's mass.
- Temperature
- About 754 °C (1,389 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Starlight
- About 186 times the starlight Earth gets from the Sun.
- Year
- A year here lasts about 18 Earth days.
Planet
- Radius
- 7.163 × Earth
- Mass
- 43.86 × Earth
- Density
- 0.65 g/cm³
- Equilibrium temperature
- 1,027 K
- Starlight received
- 186 × Earth
- Orbital period
- 18.39 days
- Average distance from its star
- 0.1528 AU
Star
- Host star
- TOI-257
- Spectral class
- F — yellow-white
- Surface temperature
- 6,095 K
- Radius
- 1.867 × Sun
- Mass
- 1.407 × Sun
- Age
- Unknown
System
- Distance from Earth
- 250.8 light-years (76.9 parsecs)
- Stars in system
- 1
- Known planets
- 1
Discovery
- Year
- 2021
- Method
- Transit
- Facility
- Transiting Exoplanet Survey Satellite (TESS)
Data from the NASA Exoplanet Archive, synced October 14, 2026.