TOI-5108 b
TOI-5108 b is a hot Jupiter orbiting TOI-5108 in the constellation Leo. It lies about 427 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-5108 b?
TOI-5108 b has a radius of 6.60 times that of Earth, or 0.59 times the radius of Jupiter. Its mass is 32.0 times that of Earth, giving it a density of 0.60 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-5108 b in the Habitable Zone?
TOI-5108 b orbits inside the inner edge of the habitable zone of TOI-5108. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-5108: 0.976–2.299 AU (conservative: 1.237–2.179 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-5108 b
The equilibrium temperature of TOI-5108 b is about 1,180 K (907 °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-5108 b — one full orbit around TOI-5108 — lasts 6.75 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.073 AU — closer to its star than Mercury is to the Sun.
How Was TOI-5108 b Discovered?
TOI-5108 b was discovered in 2025 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-5108 b?
TOI-5108 b is 427.0 light-years (130.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1599. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 7,515,200 years to make the journey.
The Host Star: TOI-5108
TOI-5108
- Surface temperature
- 5,808 K (Sun: 5,772 K)
- Mass
- 1.10 M☉
- Radius
- 1.29 R☉
- Age
- 5.8 billion years (Sun: 4.6)
Planetary System
TOI-5108 b is the only planet known to orbit TOI-5108 so far.
TOI-5108 b — Complete Data
| Radius | 6.600 Earth radii (0.589 Jupiter radii) |
|---|---|
| Mass | 32.00 Earth masses (0.101 Jupiter masses) |
| Density | 0.60 g/cm³ (Earth: 5.51) |
| Orbital period | 6.75 days |
| Orbital distance | 0.073 AU |
| Equilibrium temperature | 1,180 K (907 °C) |
| Distance from Earth | 427.0 light-years (130.9 parsecs) |
| Constellation | Leo |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-01-22. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-5108 b
Is TOI-5108 b habitable?
No — TOI-5108 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-5108 b?
TOI-5108 b is about 427 light-years from Earth in the constellation Leo. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 7,515,200 years to get there.
How big is TOI-5108 b compared to Earth?
TOI-5108 b has 6.60 times the radius of Earth and about 32.0 times its mass.
How long is a year on TOI-5108 b?
One orbit around TOI-5108 takes 6.8 Earth days — short enough that 54 of its years would fit into one Earth year.
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