K2-18 b
A confirmed exoplanet orbiting K2-18.
Compared with Earth
- Size
- About 2.4 times Earth's width.
- Mass
- About 8.9 times Earth's mass.
- Temperature
- About 11 °C (52 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Year
- A year here lasts about 33 Earth days.
Planet
- Radius
- 2.37 × Earth
- Mass
- 8.92 × Earth
- Density
- 4.11 g/cm³
- Equilibrium temperature
- 284 K
- Starlight received
- Unknown
- Orbital period
- 32.94 days
- Average distance from its star
- 0.1429 AU
Star
- Host star
- K2-18
- Spectral class
- M — red dwarf
- Surface temperature
- 3,457 K
- Radius
- 0.411 × Sun
- Mass
- 0.359 × Sun
- Age
- Unknown
System
- Distance from Earth
- 124 light-years (38.03 parsecs)
- Stars in system
- 1
- Known planets
- 2
Discovery
- Year
- 2015
- Method
- Transit
- Facility
- K2
Data from the NASA Exoplanet Archive, synced October 14, 2026.