WASP-121 b
A confirmed exoplanet orbiting WASP-121.
Compared with Earth
- Size
- About 20 times Earth's width.
- Mass
- About 372 times Earth's mass.
- Temperature
- About 2,136 °C (3,877 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Year
- A year here lasts about 1.3 Earth days.
Planet
- Radius
- 19.53 × Earth
- Mass
- 371.9 × Earth
- Density
- 0.275 g/cm³
- Equilibrium temperature
- 2,409 K
- Starlight received
- Unknown
- Orbital period
- 1.275 days
- Average distance from its star
- 0.02571 AU
Star
- Host star
- WASP-121
- Spectral class
- F — yellow-white
- Surface temperature
- 6,628 K
- Radius
- 1.461 × Sun
- Mass
- 1.33 × Sun
- Age
- 1.11 billion years
System
- Distance from Earth
- 880.3 light-years (269.9 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.