TOI-5322 b
TOI-5322 b is a hot Jupiter orbiting TOI-5322 in the constellation Pisces. It lies about 1,555 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-5322 b?
TOI-5322 b has a radius of 16.61 times that of Earth, or 1.48 times the radius of Jupiter. Its mass is 184 times that of Earth, giving it a density of 0.22 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-5322 b in the Habitable Zone?
TOI-5322 b orbits inside the inner edge of the habitable zone of TOI-5322. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-5322: 1.075–2.538 AU (conservative: 1.361–2.406 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-5322 b
The equilibrium temperature of TOI-5322 b is about 1,350 K (1,077 °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 554 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-5322 b — one full orbit around TOI-5322 — lasts 5.42 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.060 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.06).
How Was TOI-5322 b Discovered?
TOI-5322 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-5322 b?
TOI-5322 b is 1,555.4 light-years (476.9 parsecs) from Earth. Light arriving here tonight left the planet about 1,555 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 27,375,040 years to make the journey.
The Host Star: TOI-5322
TOI-5322
- Surface temperature
- 5,692 K (Sun: 5,772 K)
- Mass
- 1.00 M☉
- Radius
- 1.46 R☉
- Luminosity
- 2.0300 L☉
- Age
- 9.7 billion years (Sun: 4.6)
Planetary System
TOI-5322 b is the only planet known to orbit TOI-5322 so far.
TOI-5322 b — Complete Data
| Radius | 16.612 Earth radii (1.482 Jupiter radii) |
|---|---|
| Mass | 184.02 Earth masses (0.579 Jupiter masses) |
| Density | 0.22 g/cm³ (Earth: 5.51) |
| Orbital period | 5.42 days |
| Orbital distance | 0.060 AU |
| Eccentricity | 0.055 |
| Equilibrium temperature | 1,350 K (1,077 °C) |
| Stellar irradiation | 554.00× Earth |
| Distance from Earth | 1,555.4 light-years (476.9 parsecs) |
| Constellation | Pisces |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-07-29. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-5322 b
Is TOI-5322 b habitable?
No — TOI-5322 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-5322 b?
TOI-5322 b is about 1,555 light-years from Earth in the constellation Pisces. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 27,375,040 years to get there.
How big is TOI-5322 b compared to Earth?
TOI-5322 b has 16.61 times the radius of Earth and about 184 times its mass.
How long is a year on TOI-5322 b?
One orbit around TOI-5322 takes 5.4 Earth days — short enough that 67 of its years would fit into one Earth year.
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