TOI-2431 b
TOI-2431 b is a lava world orbiting the K7 V star TOI-2431 in the constellation Cetus. It lies about 118 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-2431 b?
TOI-2431 b has a radius of 1.53 times that of Earth. Its mass is 6.2 times that of Earth, giving it a density of 9.40 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is TOI-2431 b in the Habitable Zone?
TOI-2431 b orbits inside the inner edge of the habitable zone of TOI-2431. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-2431: 0.267–0.672 AU (conservative: 0.338–0.638 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Temperature on TOI-2431 b
The equilibrium temperature of TOI-2431 b is about 2,063 K (1,790 °C) — hot enough to melt many metals. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C.
Orbit and Year Length
A year on TOI-2431 b — one full orbit around TOI-2431 — lasts just 5.4 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.006 AU — closer to its star than Mercury is to the Sun.
How Was TOI-2431 b Discovered?
TOI-2431 b was discovered in 2026 using the transit method, with observations from Transiting Exoplanet Survey Satellite (TESS).
The transit method watches a star for the tiny, regular dip in brightness that occurs when a planet crosses in front of it. The depth and timing of these dips reveal the planet's size and orbital period.
How Far Away Is TOI-2431 b?
TOI-2431 b is 117.6 light-years (36.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1909. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,069,760 years to make the journey.
The Host Star: TOI-2431
TOI-2431
- Spectral type
- K7 V
- Surface temperature
- 4,109 K (Sun: 5,772 K)
- Mass
- 0.66 M☉
- Radius
- 0.65 R☉
- Luminosity
- 0.1090 L☉
- Age
- 2.0 billion years (Sun: 4.6)
Planetary System
TOI-2431 b is the only planet known to orbit TOI-2431 so far.
TOI-2431 b — Complete Data
| Radius | 1.534 Earth radii (0.137 Jupiter radii) |
|---|---|
| Mass | 6.20 Earth masses (0.020 Jupiter masses) |
| Density | 9.40 g/cm³ (Earth: 5.51) |
| Orbital period | 0.22 days |
| Orbital distance | 0.006 AU |
| Equilibrium temperature | 2,063 K (1,790 °C) |
| Distance from Earth | 117.6 light-years (36.1 parsecs) |
| Constellation | Cetus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-04-09. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2431 b
Is TOI-2431 b habitable?
No — TOI-2431 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-2431 b?
TOI-2431 b is about 118 light-years from Earth in the constellation Cetus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,069,760 years to get there.
How big is TOI-2431 b compared to Earth?
TOI-2431 b has 1.53 times the radius of Earth and about 6.2 times its mass.
How long is a year on TOI-2431 b?
One orbit around TOI-2431 takes 0.2 Earth days — short enough that 1,629 of its years would fit into one Earth year.
Explore TOI-2431 b in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
