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TOI-4308 b is a Neptune-like exoplanet (an ice giant with a thick atmosphere), about 2.4 times the radius of Earth. It has an equilibrium temperature of 763 K (490°C). The planet completes one orbit around its star every 9.2 Earth days. It was discovered in 2023 using the transit method. It orbits the star TOI-4308, located approximately 109 parsecs (355 light-years) from Earth.
2023
Discovered
2.42
Earth Radii
763
Temperature (K)
Discovery Information
Discovery MethodTransit
Discovery Year2,023
Discovery FacilityTransiting Exoplanet Survey Satellite (TESS)
Orbital Properties
Orbital Period9.1512 days
Semi-Major Axis0.0827 AU
Inclination89.07 deg
Physical Properties
Radius (Jupiter)0.2158 RJ
Radius (Earth)2.4189 R⊕
Eq. Temperature763.05 K
Planetary Extremes
Where TOI-4308 b sits on the spectrum of all known exoplanets.
Radius2.42 R⊕
TinyEnormous
Temperature763 K
FrozenInferno
Year Length9.2 days
LightningGlacial
Star Distance0.083 AU
ScorchedFrozen exile
Star System View
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Size Comparison
2.42x Earth's radius (0.22x Jupiter)
Orbit Comparison
Earth: 365.25 days (1 AU)TOI-4308 b: 9.2 Earth days (0.083 AU)
Host Star: TOI-4308
Effective Temperature5,243 K
Mass0.9 M☉
Radius0.7934 R☉
Size vs Sun1.26x smaller
Distance (pc)108.932 pc
Distance (ly)355.3 light-years
Planets in the TOI-4308 System
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