TOI-332 b
TOI-332 b is a super-Earth orbiting the K0 V star TOI-332 in the constellation Grus. It lies about 727 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is TOI-332 b?
TOI-332 b has a radius of 3.20 times that of Earth. Its mass is 57.2 times that of Earth, giving it a density of 9.60 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is TOI-332 b in the Habitable Zone?
TOI-332 b orbits inside the inner edge of the habitable zone of TOI-332. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-332: 0.556–1.331 AU (conservative: 0.704–1.262 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-332 b
The equilibrium temperature of TOI-332 b is about 1,871 K (1,598 °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-332 b — one full orbit around TOI-332 — lasts just 18.6 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.016 AU — closer to its star than Mercury is to the Sun.
How Was TOI-332 b Discovered?
TOI-332 b was discovered in 2023 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-332 b?
TOI-332 b is 726.8 light-years (222.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1300. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 12,791,680 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-332 b scores 0.20, ranking #3,857 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-332
TOI-332
- Spectral type
- K0 V
- Surface temperature
- 5,251 K (Sun: 5,772 K)
- Mass
- 0.88 M☉
- Radius
- 0.87 R☉
- Age
- 5.0 billion years (Sun: 4.6)
Planetary System
TOI-332 b is the only planet known to orbit TOI-332 so far.
TOI-332 b — Complete Data
| Radius | 3.200 Earth radii (0.285 Jupiter radii) |
|---|---|
| Mass | 57.20 Earth masses (0.180 Jupiter masses) |
| Density | 9.60 g/cm³ (Earth: 5.51) |
| Orbital period | 0.78 days |
| Orbital distance | 0.016 AU |
| Equilibrium temperature | 1,871 K (1,598 °C) |
| Earth Similarity Index | 0.20 |
| Distance from Earth | 726.8 light-years (222.9 parsecs) |
| Constellation | Grus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2023-09-05. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-332 b
Is TOI-332 b habitable?
No — TOI-332 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-332 b?
TOI-332 b is about 727 light-years from Earth in the constellation Grus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 12,791,680 years to get there.
How big is TOI-332 b compared to Earth?
TOI-332 b has 3.20 times the radius of Earth and about 57.2 times its mass.
How long is a year on TOI-332 b?
One orbit around TOI-332 takes 0.8 Earth days — short enough that 470 of its years would fit into one Earth year.
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