TOI-2374 b
TOI-2374 b is a hot Jupiter orbiting TOI-2374 in the constellation Capricornus. It lies about 439 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-2374 b?
TOI-2374 b has a radius of 7.49 times that of Earth, or 0.67 times the radius of Jupiter. Its mass is 61.7 times that of Earth, giving it a density of 0.80 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-2374 b in the Habitable Zone?
TOI-2374 b orbits inside the inner edge of the habitable zone of TOI-2374. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-2374: 0.418–1.011 AU (conservative: 0.530–0.958 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-2374 b
The equilibrium temperature of TOI-2374 b is about 926 K (653 °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 123 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-2374 b — one full orbit around TOI-2374 — lasts 4.31 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.048 AU — closer to its star than Mercury is to the Sun.
How Was TOI-2374 b Discovered?
TOI-2374 b 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-2374 b?
TOI-2374 b is 439.2 light-years (134.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1587. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 7,729,920 years to make the journey.
The Host Star: TOI-2374
TOI-2374 b belongs to a system of 2 stars; it orbits TOI-2374.
TOI-2374
- Surface temperature
- 5,002 K (Sun: 5,772 K)
- Mass
- 0.80 M☉
- Radius
- 0.71 R☉
- Luminosity
- 0.2850 L☉
- Age
- 4.5 billion years (Sun: 4.6)
Planetary System
TOI-2374 b is the only planet known to orbit TOI-2374 so far.
TOI-2374 b — Complete Data
| Radius | 7.488 Earth radii (0.668 Jupiter radii) |
|---|---|
| Mass | 61.66 Earth masses (0.194 Jupiter masses) |
| Density | 0.80 g/cm³ (Earth: 5.51) |
| Orbital period | 4.31 days |
| Orbital distance | 0.048 AU |
| Equilibrium temperature | 926 K (653 °C) |
| Stellar irradiation | 122.90× Earth |
| Distance from Earth | 439.2 light-years (134.7 parsecs) |
| Constellation | Capricornus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2026-05-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2374 b
Is TOI-2374 b habitable?
No — TOI-2374 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-2374 b?
TOI-2374 b is about 439 light-years from Earth in the constellation Capricornus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 7,729,920 years to get there.
How big is TOI-2374 b compared to Earth?
TOI-2374 b has 7.49 times the radius of Earth and about 61.7 times its mass.
How long is a year on TOI-2374 b?
One orbit around TOI-2374 takes 4.3 Earth days — short enough that 85 of its years would fit into one Earth year.
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