K2-138 d
A confirmed exoplanet orbiting K2-138.
Compared with Earth
- Size
- About 2.4 times Earth's width.
- Mass
- About 7.9 times Earth's mass.
- Year
- A year here lasts about 5.4 Earth days.
Planet
- Radius
- 2.39 × Earth
- Mass
- 7.92 × Earth
- Density
- 3.1 g/cm³
- Equilibrium temperature
- Unknown
- Starlight received
- Unknown
- Orbital period
- 5.405 days
- Average distance from its star
- 0.05893 AU
Star
- Host star
- K2-138
- Spectral class
- G — sun-like
- Surface temperature
- 5,356 K
- Radius
- 0.863 × Sun
- Mass
- 0.935 × Sun
- Age
- 2.8 billion years
System
- Distance from Earth
- 660.7 light-years (202.6 parsecs)
- Stars in system
- 1
- Known planets
- 6
Discovery
- Year
- 2017
- Method
- Transit
- Facility
- K2
Data from the NASA Exoplanet Archive, synced October 14, 2026.