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HD 63433 d is a Rocky exoplanet (a small, dense world with a solid surface), roughly the same size as Earth at 1.07 Earth radii. Its scorching equilibrium temperature of 1040 K (767°C) makes it far too hot for liquid water. The planet completes one orbit around its star every 4.2 Earth days. It was discovered in 2023 using the transit method. It orbits the G-type star HD 63433, located approximately 22 parsecs (73 light-years) from Earth.
2023
Discovered
1.07
Earth Radii
1040
Temperature (K)
Discovery Information
Discovery MethodTransit
Discovery Year2,023
Discovery FacilityTransiting Exoplanet Survey Satellite (TESS)
Orbital Properties
Orbital Period4.2091 days
Semi-Major Axis0.0503 AU
Eccentricity0.16
Inclination88.73 deg
Physical Properties
Radius (Jupiter)0.0957 RJ
Radius (Earth)1.073 R⊕
Eq. Temperature1,040 K
Planetary Extremes
Where HD 63433 d sits on the spectrum of all known exoplanets.
Radius1.07 R⊕
TinyEnormous
Temperature1040 K
FrozenInferno
Year Length4.2 days
LightningGlacial
Star Distance0.050 AU
ScorchedFrozen exile
Star System View
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Size Comparison
1.07x Earth's radius (0.10x Jupiter)
Orbit Comparison
Earth: 365.25 days (1 AU)HD 63433 d: 4.2 Earth days (0.050 AU)
Host Star: HD 63433
Spectral TypeG5 V
Effective Temperature5,688 K
Mass0.99 M☉
Radius0.912 R☉
Size vs Sun1.10x smaller
Luminosity0.75 L☉
Luminosity vs Sun1.3x dimmer
Metallicity [Fe/H]0.03
Distance (pc)22.4035 pc
Distance (ly)73.1 light-years
Planets in the HD 63433 System
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