TOI-5422 b
TOI-5422 b is a hot Jupiter orbiting TOI-5422 in the constellation Taurus. It lies about 1,129 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-5422 b?
TOI-5422 b has a radius of 9.10 times that of Earth, or 0.81 times the radius of Jupiter. Its mass is 8,899 times that of Earth, giving it a density of 65.80 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is TOI-5422 b in the Habitable Zone?
TOI-5422 b orbits inside the inner edge of the habitable zone of TOI-5422. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-5422: 1.123–2.642 AU (conservative: 1.422–2.505 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-5422 b
The equilibrium temperature of TOI-5422 b is about 1,369 K (1,096 °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 580 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-5422 b — one full orbit around TOI-5422 — lasts 5.38 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.062 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.09).
How Was TOI-5422 b Discovered?
TOI-5422 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-5422 b?
TOI-5422 b is 1,129.0 light-years (346.1 parsecs) from Earth. Light arriving here tonight left the planet about 1,129 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 19,870,400 years to make the journey.
The Host Star: TOI-5422
TOI-5422
- Surface temperature
- 5,820 K (Sun: 5,772 K)
- Mass
- 1.07 M☉
- Radius
- 1.47 R☉
- Luminosity
- 2.2500 L☉
- Age
- 7.6 billion years (Sun: 4.6)
Planetary System
TOI-5422 b is the only planet known to orbit TOI-5422 so far.
TOI-5422 b — Complete Data
| Radius | 9.102 Earth radii (0.812 Jupiter radii) |
|---|---|
| Mass | 8,899.20 Earth masses (28.000 Jupiter masses) |
| Density | 65.80 g/cm³ (Earth: 5.51) |
| Orbital period | 5.38 days |
| Orbital distance | 0.062 AU |
| Eccentricity | 0.094 |
| Equilibrium temperature | 1,369 K (1,096 °C) |
| Stellar irradiation | 580.00× Earth |
| Distance from Earth | 1,129.0 light-years (346.1 parsecs) |
| Constellation | Taurus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-01-29. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-5422 b
Is TOI-5422 b habitable?
No — TOI-5422 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-5422 b?
TOI-5422 b is about 1,129 light-years from Earth in the constellation Taurus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 19,870,400 years to get there.
How big is TOI-5422 b compared to Earth?
TOI-5422 b has 9.10 times the radius of Earth and about 8,899 times its mass.
How long is a year on TOI-5422 b?
One orbit around TOI-5422 takes 5.4 Earth days — short enough that 68 of its years would fit into one Earth year.
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