TOI-5143 c
TOI-5143 c is a hot Jupiter orbiting the K V star TOI-5143 in the constellation Leo. It lies about 592 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-5143 c?
TOI-5143 c has a radius of 16.25 times that of Earth, or 1.45 times the radius of Jupiter.
Is TOI-5143 c in the Habitable Zone?
TOI-5143 c orbits inside the inner edge of the habitable zone of TOI-5143. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-5143: 0.532–1.278 AU (conservative: 0.674–1.211 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 ›
Orbit and Year Length
A year on TOI-5143 c — one full orbit around TOI-5143 — lasts 5.21 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.056 AU — closer to its star than Mercury is to the Sun.
How Was TOI-5143 c Discovered?
TOI-5143 c 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-5143 c?
TOI-5143 c is 591.6 light-years (181.4 parsecs) from Earth. Light arriving here tonight left the planet around the year 1435. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 10,412,160 years to make the journey.
The Host Star: TOI-5143
TOI-5143
- Spectral type
- K V
- Surface temperature
- 5,183 K (Sun: 5,772 K)
- Mass
- 0.86 M☉
- Radius
- 0.85 R☉
- Age
- 7.4 billion years (Sun: 4.6)
Planetary System
TOI-5143 c is the only planet known to orbit TOI-5143 so far.
TOI-5143 c — Complete Data
| Radius | 16.253 Earth radii (1.450 Jupiter radii) |
|---|---|
| Orbital period | 5.21 days |
| Orbital distance | 0.056 AU |
| Distance from Earth | 591.6 light-years (181.4 parsecs) |
| Constellation | Leo |
| 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-5143 c
Is TOI-5143 c habitable?
No — TOI-5143 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-5143 c?
TOI-5143 c is about 592 light-years from Earth in the constellation Leo. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 10,412,160 years to get there.
How big is TOI-5143 c compared to Earth?
TOI-5143 c has 16.25 times the radius of Earth.
How long is a year on TOI-5143 c?
One orbit around TOI-5143 takes 5.2 Earth days — short enough that 70 of its years would fit into one Earth year.
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