K2-257 b
A confirmed exoplanet orbiting K2-257.
Compared with Earth
- Size
- About 83% of Earth's width.
- Temperature
- About 516 °C (961 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Year
- A year here lasts about 1.6 Earth days.
Planet
- Radius
- 0.83 × Earth
- Mass
- Unknown
- Density
- Unknown
- Equilibrium temperature
- 789 K
- Starlight received
- Unknown
- Orbital period
- 1.606 days
- Average distance from its star
- 0.0216 AU
Star
- Host star
- K2-257
- Spectral class
- M — red dwarf
- Surface temperature
- 3,725 K
- Radius
- 0.5 × Sun
- Mass
- 0.52 × Sun
- Age
- Unknown
System
- Distance from Earth
- 208.8 light-years (64.01 parsecs)
- Stars in system
- 1
- Known planets
- 1
Discovery
- Year
- 2018
- Method
- Transit
- Facility
- K2
Data from the NASA Exoplanet Archive, synced October 14, 2026.