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HD 23472 d is a Rocky exoplanet (a small, dense world with a solid surface), smaller than Earth at 0.75 Earth radii. It has an equilibrium temperature of 909 K (636°C). The planet completes one orbit around its star every 4.0 Earth days. It was discovered in 2022 using the transit method. It orbits the K-type star HD 23472, located approximately 39 parsecs (127 light-years) from Earth.
2022
Discovered
0.6
Earth Masses
0.75
Earth Radii
909
Temperature (K)
Discovery Information
Discovery MethodTransit
Discovery Year2,022
Discovery FacilityTransiting Exoplanet Survey Satellite (TESS)
Orbital Properties
Orbital Period3.9766 days
Semi-Major Axis0.043 AU
Eccentricity0.07
Inclination87.95 deg
Physical Properties
Mass (Jupiter)0.0017 MJ
Mass (Earth)0.55 M⊕
Radius (Jupiter)0.0669 RJ
Radius (Earth)0.75 R⊕
Density7.5 g/cm3
Eq. Temperature909 K
Insolation Flux117 S⊕
Planetary Extremes
Where HD 23472 d sits on the spectrum of all known exoplanets.
Mass0.6 M⊕
FeatherweightColossus
Radius0.75 R⊕
TinyEnormous
Temperature909 K
FrozenInferno
Year Length4.0 days
LightningGlacial
Density7.50 g/cm³
FluffyIron-dense
Star Distance0.043 AU
ScorchedFrozen exile
Star System View
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Size Comparison
0.75x Earth's radius
Orbit Comparison
Earth: 365.25 days (1 AU)HD 23472 d: 4.0 Earth days (0.043 AU)
Host Star: HD 23472
Spectral TypeK4 V
Effective Temperature4,684 K
Mass0.67 M☉
Radius0.71 R☉
Size vs Sun1.41x smaller
Luminosity0.237 L☉
Luminosity vs Sun4.2x dimmer
Metallicity [Fe/H]-0.2
Distance (pc)39.0341 pc
Distance (ly)127.3 light-years
What If You Lived Here?
68.4 kg
Your weight (from 70 kg)
0.98g
Earth-like
Feels just like home — comfortably familiar.
4.0 Earth days
Year length
Orange sunrise
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