TOI-6158 b
TOI-6158 b is a hot Jupiter orbiting the M2 star TOI-6158 in the constellation Pegasus. It lies about 590 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-6158 b?
TOI-6158 b has a radius of 10.40 times that of Earth, or 0.93 times the radius of Jupiter. Its mass is 135 times that of Earth, giving it a density of 0.66 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-6158 b in the Habitable Zone?
TOI-6158 b orbits inside the inner edge of the habitable zone of TOI-6158. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-6158: 0.144–0.373 AU (conservative: 0.182–0.354 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-6158 b
The equilibrium temperature of TOI-6158 b is about 636 K (363 °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 27.30 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-6158 b — one full orbit around TOI-6158 — lasts 3.04 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.033 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.06).
How Was TOI-6158 b Discovered?
TOI-6158 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-6158 b?
TOI-6158 b is 590.2 light-years (181.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1436. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 10,387,520 years to make the journey.
The Host Star: TOI-6158
TOI-6158
- Spectral type
- M2
- Surface temperature
- 3,467 K (Sun: 5,772 K)
- Mass
- 0.50 M☉
- Radius
- 0.48 R☉
- Luminosity
- 0.0308 L☉
Planetary System
TOI-6158 b is the only planet known to orbit TOI-6158 so far.
TOI-6158 b — Complete Data
| Radius | 10.400 Earth radii (0.930 Jupiter radii) |
|---|---|
| Mass | 135.00 Earth masses (0.425 Jupiter masses) |
| Density | 0.66 g/cm³ (Earth: 5.51) |
| Orbital period | 3.04 days |
| Orbital distance | 0.033 AU |
| Eccentricity | 0.059 |
| Equilibrium temperature | 636 K (363 °C) |
| Stellar irradiation | 27.30× Earth |
| Distance from Earth | 590.2 light-years (181.0 parsecs) |
| Constellation | Pegasus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-08-20. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-6158 b
Is TOI-6158 b habitable?
No — TOI-6158 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-6158 b?
TOI-6158 b is about 590 light-years from Earth in the constellation Pegasus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 10,387,520 years to get there.
How big is TOI-6158 b compared to Earth?
TOI-6158 b has 10.40 times the radius of Earth and about 135 times its mass.
How long is a year on TOI-6158 b?
One orbit around TOI-6158 takes 3.0 Earth days — short enough that 120 of its years would fit into one Earth year.
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