TOI-375 c
TOI-375 c is a cold gas giant orbiting TOI-375 in the constellation Hydrus. It lies about 1,292 light-years from Earth and was discovered in 2026 using the radial velocity method.
Is TOI-375 c in the Habitable Zone?
TOI-375 c orbits inside the inner edge of the habitable zone of TOI-375. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-375: 1.854–4.440 AU (conservative: 2.349–4.209 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-375 c
The equilibrium temperature of TOI-375 c is about 596 K (323 °C) — hotter than anywhere on Earth. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C. It receives 21.07 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-375 c — one full orbit around TOI-375 — lasts 115.5 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.524 AU — comparable to the inner Solar System.
How Was TOI-375 c Discovered?
TOI-375 c was discovered in 2026 using the radial velocity method, with observations from Multiple Observatories.
The radial velocity method measures the subtle wobble of a star caused by the gravitational pull of an orbiting planet, visible as periodic shifts in the star's light spectrum. The size of the wobble reveals the planet's minimum mass.
How Far Away Is TOI-375 c?
TOI-375 c is 1,292.3 light-years (396.2 parsecs) from Earth. Light arriving here tonight left the planet about 1,292 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 22,744,480 years to make the journey.
The Host Star: TOI-375
TOI-375
- Surface temperature
- 5,260 K (Sun: 5,772 K)
- Mass
- 1.44 M☉
- Radius
- 2.90 R☉
- Luminosity
- 5.7540 L☉
- Age
- 2.9 billion years (Sun: 4.6)
The TOI-375 Planetary System
TOI-375 c is one of 3 known planets in the TOI-375 system. Its siblings:
TOI-375 c — Complete Data
| Mass (best estimate) | 669.35 Earth masses |
|---|---|
| Orbital period | 115.50 days |
| Orbital distance | 0.524 AU |
| Equilibrium temperature | 596 K (323 °C) |
| Stellar irradiation | 21.07× Earth |
| Distance from Earth | 1,292.3 light-years (396.2 parsecs) |
| Constellation | Hydrus |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-02-26. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-375 c
Is TOI-375 c habitable?
No — TOI-375 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-375 c?
TOI-375 c is about 1,292 light-years from Earth in the constellation Hydrus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 22,744,480 years to get there.
How long is a year on TOI-375 c?
One orbit around TOI-375 takes 115.5 Earth days.
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