WASP-138 b
A confirmed exoplanet orbiting WASP-138.
Compared with Earth
- Size
- About 12 times Earth's width.
- Mass
- About 388 times Earth's mass.
- Temperature
- About 1,317 °C (2,402 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Year
- A year here lasts about 3.6 Earth days.
Planet
- Radius
- 12.22 × Earth
- Mass
- 387.8 × Earth
- Density
- 1.2 g/cm³
- Equilibrium temperature
- 1,590 K
- Starlight received
- Unknown
- Orbital period
- 3.634 days
- Average distance from its star
- 0.0494 AU
Star
- Host star
- WASP-138
- Spectral class
- F — yellow-white
- Surface temperature
- 6,272 K
- Radius
- 1.36 × Sun
- Mass
- 1.22 × Sun
- Age
- 3.44 billion years
System
- Distance from Earth
- 1,351 light-years (414.2 parsecs)
- Stars in system
- 1
- Known planets
- 1
Discovery
- Year
- 2016
- Method
- Transit
- Facility
- SuperWASP
Data from the NASA Exoplanet Archive, synced October 14, 2026.