TOI-2427 b
TOI-2427 b is a super-Earth orbiting the K7 V star TOI-2427 in the constellation Fornax. It lies about 93 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is TOI-2427 b?
TOI-2427 b has a radius of 1.64 times that of Earth. Its mass is 5.7 times that of Earth, giving it a density of 7.10 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is TOI-2427 b in the Habitable Zone?
TOI-2427 b orbits inside the inner edge of the habitable zone of TOI-2427. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-2427: 0.268–0.671 AU (conservative: 0.339–0.636 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-2427 b
The equilibrium temperature of TOI-2427 b is about 1,148 K (875 °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 289 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-2427 b — one full orbit around TOI-2427 — lasts just 31.3 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.020 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.07).
How Was TOI-2427 b Discovered?
TOI-2427 b was discovered in 2022 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-2427 b?
TOI-2427 b is 93.0 light-years (28.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1933. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,636,800 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. TOI-2427 b scores 0.27, ranking #2,629 of 5,565 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-2427
TOI-2427
- Spectral type
- K7 V
- Surface temperature
- 4,203 K (Sun: 5,772 K)
- Mass
- 0.64 M☉
- Radius
- 0.65 R☉
- Luminosity
- 0.1100 L☉
- Age
- 1.6 billion years (Sun: 4.6)
The TOI-2427 Planetary System
TOI-2427 b is one of 2 known planets in the TOI-2427 system. Its siblings:
- TOI-2427 c (Super Earth)
TOI-2427 b — Complete Data
| Radius | 1.640 Earth radii (0.146 Jupiter radii) |
|---|---|
| Mass | 5.69 Earth masses (0.018 Jupiter masses) |
| Density | 7.10 g/cm³ (Earth: 5.51) |
| Orbital period | 1.31 days |
| Orbital distance | 0.020 AU |
| Eccentricity | 0.074 |
| Equilibrium temperature | 1,148 K (875 °C) |
| Stellar irradiation | 289.20× Earth |
| Earth Similarity Index | 0.27 |
| Distance from Earth | 93.0 light-years (28.5 parsecs) |
| Constellation | Fornax |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2026-10-01. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2427 b
Is TOI-2427 b habitable?
No — TOI-2427 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-2427 b?
TOI-2427 b is about 93 light-years from Earth in the constellation Fornax. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,636,800 years to get there.
How big is TOI-2427 b compared to Earth?
TOI-2427 b has 1.64 times the radius of Earth and about 5.7 times its mass.
How long is a year on TOI-2427 b?
One orbit around TOI-2427 takes 1.3 Earth days — short enough that 280 of its years would fit into one Earth year.
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