TOI-4443.01
TOI-4443.01 is a lava world orbiting TOI-4443 in the constellation Hercules. It lies about 183 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-4443.01?
TOI-4443.01 has a radius of 1.72 times that of Earth.
Is TOI-4443.01 in the Habitable Zone?
TOI-4443.01 orbits inside the inner edge of the habitable zone of TOI-4443. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-4443: 0.776–1.825 AU (conservative: 0.983–1.730 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Temperature on TOI-4443.01
The equilibrium temperature of TOI-4443.01 is about 1,639 K (1,366 °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 1,194 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-4443.01 — one full orbit around TOI-4443 — lasts just 44.4 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.030 AU — closer to its star than Mercury is to the Sun.
How Was TOI-4443.01 Discovered?
TOI-4443.01 was discovered in 2024 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-4443.01?
TOI-4443.01 is 182.9 light-years (56.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1844. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,219,040 years to make the journey.
The Host Star: TOI-4443
TOI-4443
- Surface temperature
- 5,834 K (Sun: 5,772 K)
- Mass
- 1.05 M☉
- Radius
- 1.02 R☉
Planetary System
TOI-4443.01 is the only planet known to orbit TOI-4443 so far.
TOI-4443.01 — Complete Data
| Radius | 1.719 Earth radii (0.153 Jupiter radii) |
|---|---|
| Orbital period | 1.85 days |
| Orbital distance | 0.030 AU |
| Equilibrium temperature | 1,639 K (1,366 °C) |
| Stellar irradiation | 1,194.21× Earth |
| Distance from Earth | 182.9 light-years (56.1 parsecs) |
| Constellation | Hercules |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-06-11. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-4443.01
Is TOI-4443.01 habitable?
No — TOI-4443.01 orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-4443.01?
TOI-4443.01 is about 183 light-years from Earth in the constellation Hercules. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,219,040 years to get there.
How big is TOI-4443.01 compared to Earth?
TOI-4443.01 has 1.72 times the radius of Earth.
How long is a year on TOI-4443.01?
One orbit around TOI-4443 takes 1.8 Earth days — short enough that 197 of its years would fit into one Earth year.
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