TOI-5806 b
TOI-5806 b is a hot Jupiter orbiting the F3 V star TOI-5806 in the constellation Pegasus. It lies about 389 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-5806 b?
TOI-5806 b has a radius of 15.13 times that of Earth, or 1.35 times the radius of Jupiter. Its mass is 721 times that of Earth, giving it a density of 1.15 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-5806 b in the Habitable Zone?
TOI-5806 b orbits inside the inner edge of the habitable zone of TOI-5806. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-5806: 1.336–3.091 AU (conservative: 1.692–2.931 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-5806 b
The equilibrium temperature of TOI-5806 b is about 1,621 K (1,348 °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 1,660 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-5806 b — one full orbit around TOI-5806 — lasts 3.19 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.
How Was TOI-5806 b Discovered?
TOI-5806 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-5806 b?
TOI-5806 b is 388.8 light-years (119.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1638. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 6,842,880 years to make the journey.
The Host Star: TOI-5806
TOI-5806 b belongs to a system of 2 stars; it orbits TOI-5806.
TOI-5806
- Spectral type
- F3 V
- Surface temperature
- 6,730 K (Sun: 5,772 K)
- Mass
- 1.33 M☉
- Radius
- 1.39 R☉
- Luminosity
- 3.5470 L☉
Planetary System
TOI-5806 b is the only planet known to orbit TOI-5806 so far.
TOI-5806 b — Complete Data
| Radius | 15.132 Earth radii (1.350 Jupiter radii) |
|---|---|
| Mass | 721.47 Earth masses (2.270 Jupiter masses) |
| Density | 1.15 g/cm³ (Earth: 5.51) |
| Orbital period | 3.19 days |
| Orbital distance | 0.048 AU |
| Equilibrium temperature | 1,621 K (1,348 °C) |
| Stellar irradiation | 1,660.00× Earth |
| Distance from Earth | 388.8 light-years (119.2 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-5806 b
Is TOI-5806 b habitable?
No — TOI-5806 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-5806 b?
TOI-5806 b is about 389 light-years from Earth in the constellation Pegasus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 6,842,880 years to get there.
How big is TOI-5806 b compared to Earth?
TOI-5806 b has 15.13 times the radius of Earth and about 721 times its mass.
How long is a year on TOI-5806 b?
One orbit around TOI-5806 takes 3.2 Earth days — short enough that 115 of its years would fit into one Earth year.
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