TOI-5799 c
TOI-5799 c is a super-Earth orbiting the M2 V star TOI-5799 in the constellation Aquila. It lies about 91 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-5799 c?
TOI-5799 c has a radius of 1.76 times that of Earth.
Is TOI-5799 c in the Habitable Zone?
TOI-5799 c orbits inside the inner edge of the habitable zone of TOI-5799. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-5799: 0.094–0.244 AU (conservative: 0.119–0.231 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-5799 c
The equilibrium temperature of TOI-5799 c is about 337 K (64 °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-5799 c — one full orbit around TOI-5799 — lasts 14.0 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.078 AU — closer to its star than Mercury is to the Sun.
How Was TOI-5799 c Discovered?
TOI-5799 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-5799 c?
TOI-5799 c is 90.7 light-years (27.8 parsecs) from Earth. Light arriving here tonight left the planet around the year 1936. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,596,320 years to make the journey.
The Host Star: TOI-5799
TOI-5799
- Spectral type
- M2 V
- Surface temperature
- 3,452 K (Sun: 5,772 K)
- Mass
- 0.33 M☉
- Radius
- 0.32 R☉
- Age
- 9.6 billion years (Sun: 4.6)
The TOI-5799 Planetary System
TOI-5799 c is one of 2 known planets in the TOI-5799 system. Its siblings:
- TOI-5799 b (Super Earth)
TOI-5799 c — Complete Data
| Radius | 1.760 Earth radii (0.157 Jupiter radii) |
|---|---|
| Orbital period | 14.01 days |
| Orbital distance | 0.078 AU |
| Equilibrium temperature | 337 K (64 °C) |
| Distance from Earth | 90.7 light-years (27.8 parsecs) |
| Constellation | Aquila |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-10-02. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-5799 c
Is TOI-5799 c habitable?
No — TOI-5799 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-5799 c?
TOI-5799 c is about 91 light-years from Earth in the constellation Aquila. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,596,320 years to get there.
How big is TOI-5799 c compared to Earth?
TOI-5799 c has 1.76 times the radius of Earth.
How long is a year on TOI-5799 c?
One orbit around TOI-5799 takes 14.0 Earth days — short enough that 26 of its years would fit into one Earth year.
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