Back to Catalog
WASP-81 b is a Super-Jupiter exoplanet (an exceptionally massive gas giant), about 16.0 times the radius of Earth. Its scorching equilibrium temperature of 1623 K (1350°C) makes it far too hot for liquid water. The planet completes one orbit around its star every 2.7 Earth days. It was discovered in 2017 using the transit method. It orbits the star WASP-81, located approximately 399 parsecs (1300 light-years) from Earth.
2017
Discovered
231.7
Earth Masses
16.02
Earth Radii
1623
Temperature (K)
Discovery Information
Discovery MethodTransit
Discovery Year2,017
Discovery FacilityMultiple Facilities
Orbital Properties
Orbital Period2.7165 days
Semi-Major Axis0.0391 AU
Eccentricity0.066
Inclination88.69 deg
Physical Properties
Mass (Jupiter)0.729 MJ
Mass (Earth)231.6981 M⊕
Radius (Jupiter)1.429 RJ
Radius (Earth)16.0177 R⊕
Density0.332 g/cm3
Eq. Temperature1,623 K
Planetary Extremes
Where WASP-81 b sits on the spectrum of all known exoplanets.
Mass231.7 M⊕
FeatherweightColossus
Radius16.02 R⊕
TinyEnormous
Temperature1623 K
FrozenInferno
Year Length2.7 days
LightningGlacial
Density0.33 g/cm³
FluffyIron-dense
Star Distance0.039 AU
ScorchedFrozen exile
Star System View
Loading 3D view...
Size Comparison
16.02x Earth's radius (1.43x Jupiter)
Orbit Comparison
Earth: 365.25 days (1 AU)WASP-81 b: 2.7 Earth days (0.039 AU)
Host Star: WASP-81
Effective Temperature5,870 K
Mass1.08 M☉
Radius1.283 R☉
Size vs Sun1.28x larger
Luminosity1.76 L☉
Luminosity vs Sun1.760x brighter
Metallicity [Fe/H]-0.36
Distance (pc)398.505 pc
Distance (ly)1299.7 light-years
Planets in the WASP-81 System
What If You Lived Here?
63.2 kg
Your weight (from 70 kg)
0.90g
Earth-like
Feels just like home — comfortably familiar.
2.7 Earth days
Year length
Unknown sunrise
Test Your Knowledge
Related Research
Loading papers...