TOI-3912 b
TOI-3912 b is a hot Jupiter orbiting TOI-3912 in the constellation Boötes. It lies about 1,520 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is TOI-3912 b?
TOI-3912 b has a radius of 14.28 times that of Earth, or 1.27 times the radius of Jupiter. Its mass is 129 times that of Earth, giving it a density of 0.24 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-3912 b in the Habitable Zone?
TOI-3912 b orbits inside the inner edge of the habitable zone of TOI-3912. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-3912: 1.031–2.433 AU (conservative: 1.306–2.307 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-3912 b
The equilibrium temperature of TOI-3912 b is about 1,512 K (1,239 °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 872 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-3912 b — one full orbit around TOI-3912 — lasts 3.49 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.046 AU — closer to its star than Mercury is to the Sun.
How Was TOI-3912 b Discovered?
TOI-3912 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-3912 b?
TOI-3912 b is 1,519.9 light-years (466.0 parsecs) from Earth. Light arriving here tonight left the planet about 1,520 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 26,750,240 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-3912 b scores 0.06, ranking #5,068 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-3912
TOI-3912
- Surface temperature
- 5,725 K (Sun: 5,772 K)
- Mass
- 1.09 M☉
- Radius
- 1.39 R☉
- Luminosity
- 1.8760 L☉
- Age
- 7.5 billion years (Sun: 4.6)
Planetary System
TOI-3912 b is the only planet known to orbit TOI-3912 so far.
TOI-3912 b — Complete Data
| Radius | 14.280 Earth radii (1.274 Jupiter radii) |
|---|---|
| Mass | 129.04 Earth masses (0.406 Jupiter masses) |
| Density | 0.24 g/cm³ (Earth: 5.51) |
| Orbital period | 3.49 days |
| Orbital distance | 0.046 AU |
| Equilibrium temperature | 1,512 K (1,239 °C) |
| Stellar irradiation | 872.20× Earth |
| Earth Similarity Index | 0.06 |
| Distance from Earth | 1,519.9 light-years (466.0 parsecs) |
| Constellation | Boötes |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2023-02-27. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-3912 b
Is TOI-3912 b habitable?
No — TOI-3912 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-3912 b?
TOI-3912 b is about 1,520 light-years from Earth in the constellation Boötes. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 26,750,240 years to get there.
How big is TOI-3912 b compared to Earth?
TOI-3912 b has 14.28 times the radius of Earth and about 129 times its mass.
How long is a year on TOI-3912 b?
One orbit around TOI-3912 takes 3.5 Earth days — short enough that 105 of its years would fit into one Earth year.
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