K2-139 b
A confirmed exoplanet orbiting K2-139.
Compared with Earth
- Size
- About 9.1 times Earth's width.
- Temperature
- About 251 °C (484 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Year
- A year here lasts about 28 Earth days.
Planet
- Radius
- 9.11 × Earth
- Mass
- Unknown
- Density
- Unknown
- Equilibrium temperature
- 524 K
- Starlight received
- Unknown
- Orbital period
- 28.38 days
- Average distance from its star
- 0.1796 AU
Star
- Host star
- K2-139
- Spectral class
- G — sun-like
- Surface temperature
- 5,370 K
- Radius
- 0.88 × Sun
- Mass
- 0.96 × Sun
- Age
- Unknown
System
- Distance from Earth
- 501.8 light-years (153.9 parsecs)
- Stars in system
- 1
- Known planets
- 1
Discovery
- Year
- 2017
- Method
- Transit
- Facility
- K2
Data from the NASA Exoplanet Archive, synced October 14, 2026.