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TOI-1266 d is a Super-Earth exoplanet (a planet larger than Earth but smaller than Neptune) with a mass of 3.7 Earth masses. With an equilibrium temperature of 288 K (15°C), it lies within the habitable zone where liquid water could potentially exist on its surface. The planet completes one orbit around its star every 32.5 Earth days. It was discovered in 2025 using the transit timing variations method. It orbits the M-type star TOI-1266, located approximately 36 parsecs (117 light-years) from Earth.
2025
Discovered
3.7
Earth Masses
288
Temperature (K)
Discovery Information
Discovery MethodTransit Timing Variations
Discovery Year2,025
Discovery FacilityTransiting Exoplanet Survey Satellite (TESS)
Orbital Properties
Orbital Period32.509 days
Semi-Major Axis0.1513 AU
Eccentricity0.087
Physical Properties
Mass (Jupiter)0.0116 MJ
Mass (Earth)3.68 M⊕
Eq. Temperature288 K
Planetary Extremes
Where TOI-1266 d sits on the spectrum of all known exoplanets.
Mass3.7 M⊕
FeatherweightColossus
Temperature288 K
FrozenInferno
Year Length32.5 days
LightningGlacial
Star Distance0.151 AU
ScorchedFrozen exile
Star System View
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Orbit Comparison
Earth: 365.25 days (1 AU)TOI-1266 d: 32.5 Earth days (0.151 AU)
Host Star: TOI-1266
Spectral TypeM2
Effective Temperature3,563 K
Mass0.437 M☉
Radius0.4232 R☉
Size vs Sun2.36x smaller
Luminosity0.0263 L☉
Luminosity vs Sun38.0x dimmer
Metallicity [Fe/H]-0.109
Distance (pc)36.0118 pc
Distance (ly)117.5 light-years
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