TOI-5319 b
TOI-5319 b is a mini-Neptune orbiting the M star TOI-5319 in the constellation Aries. It lies about 200 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-5319 b?
TOI-5319 b has a radius of 2.83 times that of Earth.
Is TOI-5319 b in the Habitable Zone?
TOI-5319 b orbits inside the inner edge of the habitable zone of TOI-5319. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-5319: 0.152–0.394 AU (conservative: 0.193–0.373 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Temperature on TOI-5319 b
The equilibrium temperature of TOI-5319 b is about 695 K (422 °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-5319 b — one full orbit around TOI-5319 — lasts 4.08 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.051 AU — closer to its star than Mercury is to the Sun.
How Was TOI-5319 b Discovered?
TOI-5319 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-5319 b?
TOI-5319 b is 199.5 light-years (61.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1827. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,511,200 years to make the journey.
The Host Star: TOI-5319
TOI-5319
- Spectral type
- M
- Surface temperature
- 3,580 K (Sun: 5,772 K)
- Mass
- 0.50 M☉
- Radius
- 0.49 R☉
- Luminosity
- 0.0347 L☉
Planetary System
TOI-5319 b is the only planet known to orbit TOI-5319 so far.
TOI-5319 b — Complete Data
| Radius | 2.830 Earth radii (0.252 Jupiter radii) |
|---|---|
| Orbital period | 4.08 days |
| Orbital distance | 0.051 AU |
| Equilibrium temperature | 695 K (422 °C) |
| Distance from Earth | 199.5 light-years (61.2 parsecs) |
| Constellation | Aries |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-10-22. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-5319 b
Is TOI-5319 b habitable?
No — TOI-5319 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-5319 b?
TOI-5319 b is about 200 light-years from Earth in the constellation Aries. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,511,200 years to get there.
How big is TOI-5319 b compared to Earth?
TOI-5319 b has 2.83 times the radius of Earth.
How long is a year on TOI-5319 b?
One orbit around TOI-5319 takes 4.1 Earth days — short enough that 90 of its years would fit into one Earth year.
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