TOI-375 b
TOI-375 b is a hot Jupiter orbiting TOI-375 in the constellation Hydrus. It lies about 1,292 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-375 b?
TOI-375 b has a radius of 10.77 times that of Earth, or 0.96 times the radius of Jupiter. Its mass is 237 times that of Earth, giving it a density of 1.04 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-375 b in the Habitable Zone?
TOI-375 b 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 b
The equilibrium temperature of TOI-375 b is about 1,373 K (1,100 °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 593 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-375 b — one full orbit around TOI-375 — lasts 9.45 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.099 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.09).
How Was TOI-375 b Discovered?
TOI-375 b 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-375 b?
TOI-375 b 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 b is one of 3 known planets in the TOI-375 system. Its siblings:
TOI-375 b — Complete Data
| Radius | 10.772 Earth radii (0.961 Jupiter radii) |
|---|---|
| Mass | 236.78 Earth masses (0.745 Jupiter masses) |
| Density | 1.04 g/cm³ (Earth: 5.51) |
| Orbital period | 9.45 days |
| Orbital distance | 0.099 AU |
| Eccentricity | 0.087 |
| Equilibrium temperature | 1,373 K (1,100 °C) |
| Stellar irradiation | 593.30× Earth |
| Distance from Earth | 1,292.3 light-years (396.2 parsecs) |
| Constellation | Hydrus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-02-26. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-375 b
Is TOI-375 b habitable?
No — TOI-375 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-375 b?
TOI-375 b 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 big is TOI-375 b compared to Earth?
TOI-375 b has 10.77 times the radius of Earth and about 237 times its mass.
How long is a year on TOI-375 b?
One orbit around TOI-375 takes 9.5 Earth days — short enough that 39 of its years would fit into one Earth year.
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