TOI-2445 b
TOI-2445 b is a terrestrial planet orbiting TOI-2445 in the constellation Cetus. It lies about 159 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is TOI-2445 b?
TOI-2445 b has a radius of 1.25 times that of Earth.
Is TOI-2445 b in the Habitable Zone?
TOI-2445 b orbits inside the inner edge of the habitable zone of TOI-2445. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-2445: 0.074–0.193 AU (conservative: 0.093–0.183 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-2445 b
The equilibrium temperature of TOI-2445 b is about 1,060 K (787 °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-2445 b — one full orbit around TOI-2445 — lasts just 8.9 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.006 AU — closer to its star than Mercury is to the Sun.
How Was TOI-2445 b Discovered?
TOI-2445 b was discovered in 2022 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-2445 b?
TOI-2445 b is 158.5 light-years (48.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1868. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,789,600 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-2445 b scores 0.30, ranking #1,535 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-2445
TOI-2445
- Surface temperature
- 3,333 K (Sun: 5,772 K)
- Mass
- 0.25 M☉
- Radius
- 0.27 R☉
Planetary System
TOI-2445 b is the only planet known to orbit TOI-2445 so far.
TOI-2445 b — Complete Data
| Radius | 1.250 Earth radii (0.112 Jupiter radii) |
|---|---|
| Orbital period | 0.37 days |
| Orbital distance | 0.006 AU |
| Equilibrium temperature | 1,060 K (787 °C) |
| Earth Similarity Index | 0.30 |
| Distance from Earth | 158.5 light-years (48.6 parsecs) |
| Constellation | Cetus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2022-02-15. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2445 b
Is TOI-2445 b habitable?
No — TOI-2445 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-2445 b?
TOI-2445 b is about 159 light-years from Earth in the constellation Cetus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,789,600 years to get there.
How big is TOI-2445 b compared to Earth?
TOI-2445 b has 1.25 times the radius of Earth.
How long is a year on TOI-2445 b?
One orbit around TOI-2445 takes 0.4 Earth days — short enough that 984 of its years would fit into one Earth year.
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