TOI-2458 b
TOI-2458 b is a super-Earth orbiting the F9-F9.5 star TOI-2458 in the constellation Orion. It lies about 368 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-2458 b?
TOI-2458 b has a radius of 2.83 times that of Earth. Its mass is 13.3 times that of Earth, giving it a density of 3.23 g/cm³ — between that of rocky and gaseous planets.
Is TOI-2458 b in the Habitable Zone?
TOI-2458 b orbits inside the inner edge of the habitable zone of TOI-2458. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-2458: 1.047–2.454 AU (conservative: 1.327–2.326 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-2458 b
The equilibrium temperature of TOI-2458 b is about 1,509 K (1,236 °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 865 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-2458 b — one full orbit around TOI-2458 — lasts 3.74 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.048 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.09).
How Was TOI-2458 b Discovered?
TOI-2458 b was discovered in 2024 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-2458 b?
TOI-2458 b is 368.4 light-years (113.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1658. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 6,483,840 years to make the journey.
The Host Star: TOI-2458
TOI-2458
- Spectral type
- F9-F9.5
- Surface temperature
- 6,005 K (Sun: 5,772 K)
- Mass
- 1.05 M☉
- Radius
- 1.31 R☉
- Age
- 5.7 billion years (Sun: 4.6)
The TOI-2458 Planetary System
TOI-2458 b is one of 2 known planets in the TOI-2458 system. Its siblings:
- TOI-2458 c (Neptune-like)
TOI-2458 b — Complete Data
| Radius | 2.830 Earth radii (0.252 Jupiter radii) |
|---|---|
| Mass | 13.31 Earth masses (0.042 Jupiter masses) |
| Density | 3.23 g/cm³ (Earth: 5.51) |
| Orbital period | 3.74 days |
| Orbital distance | 0.048 AU |
| Eccentricity | 0.087 |
| Equilibrium temperature | 1,509 K (1,236 °C) |
| Stellar irradiation | 865.00× Earth |
| Distance from Earth | 368.4 light-years (113.0 parsecs) |
| Constellation | Orion |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-12-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2458 b
Is TOI-2458 b habitable?
No — TOI-2458 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-2458 b?
TOI-2458 b is about 368 light-years from Earth in the constellation Orion. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 6,483,840 years to get there.
How big is TOI-2458 b compared to Earth?
TOI-2458 b has 2.83 times the radius of Earth and about 13.3 times its mass.
How long is a year on TOI-2458 b?
One orbit around TOI-2458 takes 3.7 Earth days — short enough that 98 of its years would fit into one Earth year.
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