TOI-206 b
TOI-206 b is a super-Earth orbiting TOI-206 in the constellation Dorado. It lies about 156 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is TOI-206 b?
TOI-206 b has a radius of 1.30 times that of Earth.
Is TOI-206 b in the Habitable Zone?
TOI-206 b orbits inside the inner edge of the habitable zone of TOI-206. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-206: 0.098–0.256 AU (conservative: 0.124–0.243 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-206 b
The equilibrium temperature of TOI-206 b is about 910 K (637 °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-206 b — one full orbit around TOI-206 — lasts just 17.7 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.011 AU — closer to its star than Mercury is to the Sun.
How Was TOI-206 b Discovered?
TOI-206 b was discovered in 2022 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-206 b?
TOI-206 b is 155.7 light-years (47.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1871. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,740,320 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. TOI-206 b scores 0.30, ranking #1,403 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-206
TOI-206
- Surface temperature
- 3,383 K (Sun: 5,772 K)
- Mass
- 0.35 M☉
- Radius
- 0.35 R☉
Planetary System
TOI-206 b is the only planet known to orbit TOI-206 so far.
TOI-206 b — Complete Data
| Radius | 1.300 Earth radii (0.116 Jupiter radii) |
|---|---|
| Orbital period | 0.74 days |
| Orbital distance | 0.011 AU |
| Equilibrium temperature | 910 K (637 °C) |
| Earth Similarity Index | 0.30 |
| Distance from Earth | 155.7 light-years (47.7 parsecs) |
| Constellation | Dorado |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2022-02-15. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-206 b
Is TOI-206 b habitable?
No — TOI-206 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-206 b?
TOI-206 b is about 156 light-years from Earth in the constellation Dorado. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,740,320 years to get there.
How big is TOI-206 b compared to Earth?
TOI-206 b has 1.30 times the radius of Earth.
How long is a year on TOI-206 b?
One orbit around TOI-206 takes 0.7 Earth days — short enough that 496 of its years would fit into one Earth year.
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