TOI-4364 b
TOI-4364 b is a mini-Neptune orbiting the M4 V star TOI-4364 in the constellation Orion. It lies about 143 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-4364 b?
TOI-4364 b has a radius of 2.01 times that of Earth.
Is TOI-4364 b in the Habitable Zone?
TOI-4364 b orbits inside the inner edge of the habitable zone of TOI-4364. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-4364: 0.143–0.372 AU (conservative: 0.182–0.352 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-4364 b
The equilibrium temperature of TOI-4364 b is about 488 K (215 °C) — hotter than anywhere on Earth. 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-4364 b — one full orbit around TOI-4364 — lasts 5.42 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. Its orbit is mildly elliptical (eccentricity 0.29).
How Was TOI-4364 b Discovered?
TOI-4364 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-4364 b?
TOI-4364 b is 143.4 light-years (44.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1883. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,523,840 years to make the journey.
The Host Star: TOI-4364
TOI-4364
- Spectral type
- M4 V
- Surface temperature
- 3,528 K (Sun: 5,772 K)
- Mass
- 0.49 M☉
- Radius
- 0.47 R☉
- Luminosity
- 0.0308 L☉
- Age
- 0.7 billion years (Sun: 4.6)
Planetary System
TOI-4364 b is the only planet known to orbit TOI-4364 so far.
TOI-4364 b — Complete Data
| Radius | 2.010 Earth radii (0.179 Jupiter radii) |
|---|---|
| Orbital period | 5.42 days |
| Orbital distance | 0.048 AU |
| Eccentricity | 0.290 |
| Equilibrium temperature | 488 K (215 °C) |
| Distance from Earth | 143.4 light-years (44.0 parsecs) |
| Constellation | Orion |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-03-17. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-4364 b
Is TOI-4364 b habitable?
No — TOI-4364 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-4364 b?
TOI-4364 b is about 143 light-years from Earth in the constellation Orion. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,523,840 years to get there.
How big is TOI-4364 b compared to Earth?
TOI-4364 b has 2.01 times the radius of Earth.
How long is a year on TOI-4364 b?
One orbit around TOI-4364 takes 5.4 Earth days — short enough that 67 of its years would fit into one Earth year.
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