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TOI-5789 b is a Super-Earth exoplanet (a planet larger than Earth but smaller than Neptune) with a mass of 2.1 Earth masses. Its scorching equilibrium temperature of 1201 K (928°C) makes it far too hot for liquid water. Despite its name, Super-Earths are not necessarily habitable; the term refers only to size. The planet completes one orbit around its star every 2.8 Earth days. It was discovered in 2026 using the radial velocity method. It orbits the K-type star TOI-5789, located approximately 20 parsecs (67 light-years) from Earth.
2026
Discovered
2.1
Earth Masses
1201
Temperature (K)
Discovery Information
Discovery MethodRadial Velocity
Discovery Year2,026
Discovery FacilityMultiple Observatories
Orbital Properties
Orbital Period2.7637 days
Semi-Major Axis0.0361 AU
Eccentricity0
Physical Properties
Mass (Jupiter)0.0067 MJ
Mass (Earth)2.12 M⊕
Eq. Temperature1,201 K
Planetary Extremes
Where TOI-5789 b sits on the spectrum of all known exoplanets.
Mass2.1 M⊕
FeatherweightColossus
Temperature1201 K
FrozenInferno
Year Length2.8 days
LightningGlacial
Star Distance0.036 AU
ScorchedFrozen exile
Star System View
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Orbit Comparison
Earth: 365.25 days (1 AU)TOI-5789 b: 2.8 Earth days (0.036 AU)
Host Star: TOI-5789
Spectral TypeK1 V
Effective Temperature5,185 K
Mass0.821 M☉
Radius0.833 R☉
Size vs Sun1.20x smaller
Luminosity0.469 L☉
Luminosity vs Sun2.1x dimmer
Metallicity [Fe/H]-0.12
Distance (pc)20.4581 pc
Distance (ly)66.7 light-years
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