TOI-1080 b
TOI-1080 b is a terrestrial planet orbiting the M4.0±1.0 V star TOI-1080 in the constellation Telescopium. It lies about 83 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-1080 b?
TOI-1080 b has a radius of 1.20 times that of Earth. Its mass is 10.7 times that of Earth.
Is TOI-1080 b in the Habitable Zone?
TOI-1080 b orbits inside the inner edge of the habitable zone of TOI-1080. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1080: 0.047–0.124 AU (conservative: 0.059–0.117 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-1080 b
The equilibrium temperature of TOI-1080 b is about 368 K (95 °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. It receives 4.35 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-1080 b — one full orbit around TOI-1080 — lasts 3.97 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.027 AU — closer to its star than Mercury is to the Sun.
How Was TOI-1080 b Discovered?
TOI-1080 b was discovered in 2026 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-1080 b?
TOI-1080 b is 83.4 light-years (25.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1943. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,467,840 years to make the journey.
The Host Star: TOI-1080
TOI-1080
- Spectral type
- M4.0±1.0 V
- Surface temperature
- 3,065 K (Sun: 5,772 K)
- Mass
- 0.17 M☉
- Radius
- 0.20 R☉
- Luminosity
- 0.0032 L☉
- Age
- 6.0 billion years (Sun: 4.6)
Planetary System
TOI-1080 b is the only planet known to orbit TOI-1080 so far.
TOI-1080 b — Complete Data
| Radius | 1.200 Earth radii (0.107 Jupiter radii) |
|---|---|
| Mass | 10.70 Earth masses (0.034 Jupiter masses) |
| Orbital period | 3.97 days |
| Orbital distance | 0.027 AU |
| Equilibrium temperature | 368 K (95 °C) |
| Stellar irradiation | 4.35× Earth |
| Distance from Earth | 83.4 light-years (25.6 parsecs) |
| Constellation | Telescopium |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-03-19. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1080 b
Is TOI-1080 b habitable?
No — TOI-1080 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1080 b?
TOI-1080 b is about 83 light-years from Earth in the constellation Telescopium. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,467,840 years to get there.
How big is TOI-1080 b compared to Earth?
TOI-1080 b has 1.20 times the radius of Earth and about 10.7 times its mass.
How long is a year on TOI-1080 b?
One orbit around TOI-1080 takes 4.0 Earth days — short enough that 92 of its years would fit into one Earth year.
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