TOI-426 b
TOI-426 b is a super-Earth orbiting the G2 V star TOI-426 in the constellation Lepus. It lies about 371 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-426 b?
TOI-426 b has a radius of 2.19 times that of Earth. Its mass is 6.7 times that of Earth, giving it a density of 3.52 g/cm³ — between that of rocky and gaseous planets.
Is TOI-426 b in the Habitable Zone?
TOI-426 b orbits inside the inner edge of the habitable zone of TOI-426. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-426: 0.733–1.728 AU (conservative: 0.928–1.638 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-426 b
The equilibrium temperature of TOI-426 b is about 1,790 K (1,517 °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. It receives 1,711 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-426 b — one full orbit around TOI-426 — lasts just 31.7 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.024 AU — closer to its star than Mercury is to the Sun.
How Was TOI-426 b Discovered?
TOI-426 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-426 b?
TOI-426 b is 370.5 light-years (113.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1656. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 6,520,800 years to make the journey.
The Host Star: TOI-426
TOI-426
- Spectral type
- G2 V
- Surface temperature
- 5,750 K (Sun: 5,772 K)
- Mass
- 1.00 M☉
- Radius
- 0.99 R☉
- Luminosity
- 0.9506 L☉
- Age
- 1.6 billion years (Sun: 4.6)
The TOI-426 Planetary System
TOI-426 b is one of 2 known planets in the TOI-426 system. Its siblings:
- TOI-426 c (Cold Gas Giant)
TOI-426 b — Complete Data
| Radius | 2.190 Earth radii (0.195 Jupiter radii) |
|---|---|
| Mass | 6.70 Earth masses (0.021 Jupiter masses) |
| Density | 3.52 g/cm³ (Earth: 5.51) |
| Orbital period | 1.32 days |
| Orbital distance | 0.024 AU |
| Equilibrium temperature | 1,790 K (1,517 °C) |
| Stellar irradiation | 1,711.00× Earth |
| Distance from Earth | 370.5 light-years (113.6 parsecs) |
| Constellation | Lepus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-09-25. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-426 b
Is TOI-426 b habitable?
No — TOI-426 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-426 b?
TOI-426 b is about 371 light-years from Earth in the constellation Lepus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 6,520,800 years to get there.
How big is TOI-426 b compared to Earth?
TOI-426 b has 2.19 times the radius of Earth and about 6.7 times its mass.
How long is a year on TOI-426 b?
One orbit around TOI-426 takes 1.3 Earth days — short enough that 277 of its years would fit into one Earth year.
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