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TOI-125 b is a Neptune-like exoplanet (an ice giant with a thick atmosphere), about 2.7 times the radius of Earth. Its scorching equilibrium temperature of 1037 K (764°C) makes it far too hot for liquid water. The planet completes one orbit around its star every 4.7 Earth days. It was discovered in 2019 using the transit method. It orbits the K-type star TOI-125, located approximately 111 parsecs (362 light-years) from Earth.
2019
Discovered
9.5
Earth Masses
2.73
Earth Radii
1037
Temperature (K)
Discovery Information
Discovery MethodTransit
Discovery Year2,019
Discovery FacilityTransiting Exoplanet Survey Satellite (TESS)
Orbital Properties
Orbital Period4.6538 days
Semi-Major Axis0.0519 AU
Eccentricity0.194
Inclination88.92 deg
Physical Properties
Mass (Jupiter)0.0299 MJ
Mass (Earth)9.5 M⊕
Radius (Jupiter)0.2432 RJ
Radius (Earth)2.726 R⊕
Density2.57 g/cm3
Eq. Temperature1,037 K
Insolation Flux185 S⊕
Planetary Extremes
Where TOI-125 b sits on the spectrum of all known exoplanets.
Mass9.5 M⊕
FeatherweightColossus
Radius2.73 R⊕
TinyEnormous
Temperature1037 K
FrozenInferno
Year Length4.7 days
LightningGlacial
Density2.57 g/cm³
FluffyIron-dense
Star Distance0.052 AU
ScorchedFrozen exile
Star System View
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Size Comparison
2.73x Earth's radius (0.24x Jupiter)
Orbit Comparison
Earth: 365.25 days (1 AU)TOI-125 b: 4.7 Earth days (0.052 AU)
Host Star: TOI-125
Spectral TypeK0 V
Effective Temperature5,320 K
Mass0.859 M☉
Radius0.848 R☉
Size vs Sun1.18x smaller
Luminosity0.519 L☉
Luminosity vs Sun1.9x dimmer
Metallicity [Fe/H]-0.02
Distance (pc)111.059 pc
Distance (ly)362.2 light-years
Planets in the TOI-125 System
What If You Lived Here?
89.5 kg
Your weight (from 70 kg)
1.28g
Heavy
Every step takes effort. Climbing stairs is exhausting.
4.7 Earth days
Year length
Orange sunrise
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