TOI-5720 b
TOI-5720 b is a terrestrial planet orbiting the M3.5 +/- 1.0 star TOI-5720 in the constellation Leo. It lies about 117 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-5720 b?
TOI-5720 b has a radius of 1.09 times that of Earth. Its mass is 4.3 times that of Earth.
Is TOI-5720 b in the Habitable Zone?
TOI-5720 b orbits inside the inner edge of the habitable zone of TOI-5720. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-5720: 0.104–0.273 AU (conservative: 0.132–0.258 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-5720 b
The equilibrium temperature of TOI-5720 b is about 708 K (435 °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 41.70 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-5720 b — one full orbit around TOI-5720 — lasts just 34.4 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.018 AU — closer to its star than Mercury is to the Sun.
How Was TOI-5720 b Discovered?
TOI-5720 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-5720 b?
TOI-5720 b is 116.8 light-years (35.8 parsecs) from Earth. Light arriving here tonight left the planet around the year 1910. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,055,680 years to make the journey.
The Host Star: TOI-5720
TOI-5720
- Spectral type
- M3.5 +/- 1.0
- Surface temperature
- 3,325 K (Sun: 5,772 K)
- Mass
- 0.38 M☉
- Radius
- 0.38 R☉
- Luminosity
- 0.0161 L☉
- Age
- 5.0 billion years (Sun: 4.6)
Planetary System
TOI-5720 b is the only planet known to orbit TOI-5720 so far.
TOI-5720 b — Complete Data
| Radius | 1.090 Earth radii (0.097 Jupiter radii) |
|---|---|
| Mass | 4.30 Earth masses (0.014 Jupiter masses) |
| Orbital period | 1.43 days |
| Orbital distance | 0.018 AU |
| Equilibrium temperature | 708 K (435 °C) |
| Stellar irradiation | 41.70× Earth |
| Distance from Earth | 116.8 light-years (35.8 parsecs) |
| Constellation | Leo |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-05-29. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-5720 b
Is TOI-5720 b habitable?
No — TOI-5720 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-5720 b?
TOI-5720 b is about 117 light-years from Earth in the constellation Leo. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,055,680 years to get there.
How big is TOI-5720 b compared to Earth?
TOI-5720 b has 1.09 times the radius of Earth and about 4.3 times its mass.
How long is a year on TOI-5720 b?
One orbit around TOI-5720 takes 1.4 Earth days — short enough that 255 of its years would fit into one Earth year.
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