TOI-132 b
TOI-132 b is a super-Earth orbiting the G8 V star TOI-132 in the constellation Grus. It lies about 534 light-years from Earth and was discovered in 2020 using the transit method.
How Big Is TOI-132 b?
TOI-132 b has a radius of 3.42 times that of Earth. Its mass is 22.4 times that of Earth, giving it a density of 3.08 g/cm³ — between that of rocky and gaseous planets.
Is TOI-132 b in the Habitable Zone?
TOI-132 b orbits inside the inner edge of the habitable zone of TOI-132. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-132: 0.594–1.416 AU (conservative: 0.753–1.343 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-132 b
The equilibrium temperature of TOI-132 b is about 1,395 K (1,122 °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 860 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-132 b — one full orbit around TOI-132 — lasts 2.11 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.026 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.06).
How Was TOI-132 b Discovered?
TOI-132 b was discovered in 2020 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-132 b?
TOI-132 b is 533.8 light-years (163.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1493. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 9,394,880 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-132 b scores 0.20, ranking #3,923 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-132
TOI-132
- Spectral type
- G8 V
- Surface temperature
- 5,397 K (Sun: 5,772 K)
- Mass
- 0.97 M☉
- Radius
- 0.90 R☉
- Luminosity
- 0.6000 L☉
- Age
- 6.3 billion years (Sun: 4.6)
Planetary System
TOI-132 b is the only planet known to orbit TOI-132 so far.
TOI-132 b — Complete Data
| Radius | 3.420 Earth radii (0.305 Jupiter radii) |
|---|---|
| Mass | 22.40 Earth masses (0.070 Jupiter masses) |
| Density | 3.08 g/cm³ (Earth: 5.51) |
| Orbital period | 2.11 days |
| Orbital distance | 0.026 AU |
| Eccentricity | 0.059 |
| Equilibrium temperature | 1,395 K (1,122 °C) |
| Stellar irradiation | 860.00× Earth |
| Earth Similarity Index | 0.20 |
| Distance from Earth | 533.8 light-years (163.7 parsecs) |
| Constellation | Grus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2020 |
Data: NASA Exoplanet Archive, last updated 2020-02-21. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-132 b
Is TOI-132 b habitable?
No — TOI-132 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-132 b?
TOI-132 b is about 534 light-years from Earth in the constellation Grus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 9,394,880 years to get there.
How big is TOI-132 b compared to Earth?
TOI-132 b has 3.42 times the radius of Earth and about 22.4 times its mass.
How long is a year on TOI-132 b?
One orbit around TOI-132 takes 2.1 Earth days — short enough that 173 of its years would fit into one Earth year.
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