K2-251 b
A confirmed exoplanet orbiting K2-251.
Compared with Earth
- Size
- About 2.4 times Earth's width.
- Temperature
- About 164 °C (327 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Year
- A year here lasts about 9.3 Earth days.
Planet
- Radius
- 2.35 × Earth
- Mass
- Unknown
- Density
- Unknown
- Equilibrium temperature
- 437 K
- Starlight received
- Unknown
- Orbital period
- 9.301 days
- Average distance from its star
- 0.0694 AU
Star
- Host star
- K2-251
- Spectral class
- M — red dwarf
- Surface temperature
- 3,717 K
- Radius
- 0.49 × Sun
- Mass
- 0.52 × Sun
- Age
- Unknown
System
- Distance from Earth
- 479.5 light-years (147 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.