TOI-4443 c
TOI-4443 c is a mini-Neptune orbiting TOI-4443 in the constellation Hercules. It lies about 183 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-4443 c?
TOI-4443 c has a radius of 2.22 times that of Earth.
Is TOI-4443 c in the Habitable Zone?
The position of TOI-4443 c relative to the habitable zone of TOI-4443 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-4443: 0.777–1.829 AU (conservative: 0.985–1.734 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 ›
Orbit and Year Length
A year on TOI-4443 c — one full orbit around TOI-4443 — lasts 10.3 Earth days, shorter than Mercury's 88-day year.
How Was TOI-4443 c Discovered?
TOI-4443 c was discovered in 2026 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 c?
TOI-4443 c 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☉
- Luminosity
- 1.0802 L☉
The TOI-4443 Planetary System
TOI-4443 c is one of 2 known planets in the TOI-4443 system. Its siblings:
- TOI-4443.01 (Lava World)
TOI-4443 c — Complete Data
| Radius | 2.220 Earth radii (0.198 Jupiter radii) |
|---|---|
| Orbital period | 10.31 days |
| Distance from Earth | 182.9 light-years (56.1 parsecs) |
| Constellation | Hercules |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-10-08. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-4443 c
Is TOI-4443 c habitable?
TOI-4443 c is not known to orbit within the habitable zone of TOI-4443, and as a mini-Neptune it is an unlikely candidate for life as we know it.
How far away is TOI-4443 c?
TOI-4443 c 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 c compared to Earth?
TOI-4443 c has 2.22 times the radius of Earth.
How long is a year on TOI-4443 c?
One orbit around TOI-4443 takes 10.3 Earth days — short enough that 35 of its years would fit into one Earth year.
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