TOI-4406 b
TOI-4406 b is a cold gas giant orbiting TOI-4406 in the constellation Phoenix. It lies about 854 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is TOI-4406 b?
TOI-4406 b has a radius of 11.21 times that of Earth, or 1.00 times the radius of Jupiter. Its mass is 95.3 times that of Earth.
Is TOI-4406 b in the Habitable Zone?
TOI-4406 b orbits inside the inner edge of the habitable zone of TOI-4406. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-4406: 1.108–2.584 AU (conservative: 1.403–2.450 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-4406 b
The equilibrium temperature of TOI-4406 b is about 904 K (631 °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-4406 b — one full orbit around TOI-4406 — lasts 30.1 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.201 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.15).
How Was TOI-4406 b Discovered?
TOI-4406 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-4406 b?
TOI-4406 b is 854.0 light-years (261.8 parsecs) from Earth. Light arriving here tonight left the planet around the year 1172. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 15,030,400 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-4406 b scores 0.10, ranking #4,463 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-4406
TOI-4406
- Surface temperature
- 6,219 K (Sun: 5,772 K)
- Mass
- 1.19 M☉
- Radius
- 1.29 R☉
- Luminosity
- 2.3000 L☉
- Age
- 2.9 billion years (Sun: 4.6)
Planetary System
TOI-4406 b is the only planet known to orbit TOI-4406 so far.
TOI-4406 b — Complete Data
| Radius | 11.209 Earth radii (1.000 Jupiter radii) |
|---|---|
| Mass | 95.35 Earth masses (0.300 Jupiter masses) |
| Orbital period | 30.08 days |
| Orbital distance | 0.201 AU |
| Eccentricity | 0.150 |
| Equilibrium temperature | 904 K (631 °C) |
| Earth Similarity Index | 0.10 |
| Distance from Earth | 854.0 light-years (261.8 parsecs) |
| Constellation | Phoenix |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2023-04-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-4406 b
Is TOI-4406 b habitable?
No — TOI-4406 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-4406 b?
TOI-4406 b is about 854 light-years from Earth in the constellation Phoenix. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 15,030,400 years to get there.
How big is TOI-4406 b compared to Earth?
TOI-4406 b has 11.21 times the radius of Earth and about 95.3 times its mass.
How long is a year on TOI-4406 b?
One orbit around TOI-4406 takes 30.1 Earth days — short enough that 12 of its years would fit into one Earth year.
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