TOI-5301 b
TOI-5301 b is a hot Jupiter orbiting TOI-5301 in the constellation Pisces. It lies about 2,052 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-5301 b?
TOI-5301 b has a radius of 13.09 times that of Earth, or 1.17 times the radius of Jupiter. Its mass is 1,182 times that of Earth, giving it a density of 2.88 g/cm³ — between that of rocky and gaseous planets.
Is TOI-5301 b in the Habitable Zone?
TOI-5301 b orbits inside the inner edge of the habitable zone of TOI-5301. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-5301: 1.867–4.354 AU (conservative: 2.365–4.128 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-5301 b
The equilibrium temperature of TOI-5301 b is about 1,648 K (1,375 °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-5301 b — one full orbit around TOI-5301 — lasts 5.86 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. Its orbit is highly elliptical (eccentricity 0.33), swinging dramatically closer to and farther from its star.
How Was TOI-5301 b Discovered?
TOI-5301 b was discovered in 2024 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-5301 b?
TOI-5301 b is 2,052.0 light-years (629.2 parsecs) from Earth. Light arriving here tonight left the planet about 2,052 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 36,115,200 years to make the journey.
The Host Star: TOI-5301
TOI-5301
- Surface temperature
- 6,240 K (Sun: 5,772 K)
- Mass
- 1.48 M☉
- Radius
- 2.19 R☉
- Luminosity
- 6.5500 L☉
- Age
- 2.4 billion years (Sun: 4.6)
Planetary System
TOI-5301 b is the only planet known to orbit TOI-5301 so far.
TOI-5301 b — Complete Data
| Radius | 13.092 Earth radii (1.168 Jupiter radii) |
|---|---|
| Mass | 1,182.32 Earth masses (3.720 Jupiter masses) |
| Density | 2.88 g/cm³ (Earth: 5.51) |
| Orbital period | 5.86 days |
| Orbital distance | 0.073 AU |
| Eccentricity | 0.330 |
| Equilibrium temperature | 1,648 K (1,375 °C) |
| Distance from Earth | 2,052.0 light-years (629.2 parsecs) |
| Constellation | Pisces |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-07-23. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-5301 b
Is TOI-5301 b habitable?
No — TOI-5301 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-5301 b?
TOI-5301 b is about 2,052 light-years from Earth in the constellation Pisces. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 36,115,200 years to get there.
How big is TOI-5301 b compared to Earth?
TOI-5301 b has 13.09 times the radius of Earth and about 1,182 times its mass.
How long is a year on TOI-5301 b?
One orbit around TOI-5301 takes 5.9 Earth days — short enough that 62 of its years would fit into one Earth year.
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