TOI-912 b
TOI-912 b is a super-Earth orbiting the M3 star TOI-912 in the constellation Apus. It lies about 85 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-912 b?
TOI-912 b has a radius of 1.93 times that of Earth. Its mass is 5.1 times that of Earth, giving it a density of 4.00 g/cm³ — between that of rocky and gaseous planets.
Is TOI-912 b in the Habitable Zone?
TOI-912 b orbits inside the inner edge of the habitable zone of TOI-912. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-912: 0.131–0.339 AU (conservative: 0.166–0.321 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-912 b
The equilibrium temperature of TOI-912 b is about 551 K (278 °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 15.00 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-912 b — one full orbit around TOI-912 — lasts 4.68 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.041 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.58), swinging dramatically closer to and farther from its star.
How Was TOI-912 b Discovered?
TOI-912 b 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-912 b?
TOI-912 b is 85.2 light-years (26.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1941. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,499,520 years to make the journey.
The Host Star: TOI-912
TOI-912
- Spectral type
- M3
- Surface temperature
- 3,572 K (Sun: 5,772 K)
- Mass
- 0.42 M☉
- Radius
- 0.42 R☉
- Luminosity
- 0.0257 L☉
- Age
- 0.8 billion years (Sun: 4.6)
Planetary System
TOI-912 b is the only planet known to orbit TOI-912 so far.
TOI-912 b — Complete Data
| Radius | 1.930 Earth radii (0.172 Jupiter radii) |
|---|---|
| Mass | 5.10 Earth masses (0.016 Jupiter masses) |
| Density | 4.00 g/cm³ (Earth: 5.51) |
| Orbital period | 4.68 days |
| Orbital distance | 0.041 AU |
| Eccentricity | 0.580 |
| Equilibrium temperature | 551 K (278 °C) |
| Stellar irradiation | 15.00× Earth |
| Distance from Earth | 85.2 light-years (26.1 parsecs) |
| Constellation | Apus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-12-11. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-912 b
Is TOI-912 b habitable?
No — TOI-912 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-912 b?
TOI-912 b is about 85 light-years from Earth in the constellation Apus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,499,520 years to get there.
How big is TOI-912 b compared to Earth?
TOI-912 b has 1.93 times the radius of Earth and about 5.1 times its mass.
How long is a year on TOI-912 b?
One orbit around TOI-912 takes 4.7 Earth days — short enough that 78 of its years would fit into one Earth year.
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