TOI-2379 b
TOI-2379 b is a hot Jupiter orbiting TOI-2379 in the constellation Phoenix. It lies about 689 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-2379 b?
TOI-2379 b has a radius of 11.72 times that of Earth, or 1.05 times the radius of Jupiter. Its mass is 1,831 times that of Earth, giving it a density of 6.21 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is TOI-2379 b in the Habitable Zone?
TOI-2379 b orbits inside the inner edge of the habitable zone of TOI-2379. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-2379: 0.209–0.536 AU (conservative: 0.264–0.508 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-2379 b
The equilibrium temperature of TOI-2379 b is about 624 K (351 °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 25.30 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-2379 b — one full orbit around TOI-2379 — lasts 5.47 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.053 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.34), swinging dramatically closer to and farther from its star.
How Was TOI-2379 b Discovered?
TOI-2379 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-2379 b?
TOI-2379 b is 689.0 light-years (211.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1337. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 12,126,400 years to make the journey.
The Host Star: TOI-2379
TOI-2379
- Surface temperature
- 3,707 K (Sun: 5,772 K)
- Mass
- 0.65 M☉
- Radius
- 0.62 R☉
- Age
- 10.4 billion years (Sun: 4.6)
Planetary System
TOI-2379 b is the only planet known to orbit TOI-2379 so far.
TOI-2379 b — Complete Data
| Radius | 11.725 Earth radii (1.046 Jupiter radii) |
|---|---|
| Mass | 1,830.69 Earth masses (5.760 Jupiter masses) |
| Density | 6.21 g/cm³ (Earth: 5.51) |
| Orbital period | 5.47 days |
| Orbital distance | 0.053 AU |
| Eccentricity | 0.342 |
| Equilibrium temperature | 624 K (351 °C) |
| Stellar irradiation | 25.30× Earth |
| Distance from Earth | 689.0 light-years (211.2 parsecs) |
| Constellation | Phoenix |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-09-17. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2379 b
Is TOI-2379 b habitable?
No — TOI-2379 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-2379 b?
TOI-2379 b is about 689 light-years from Earth in the constellation Phoenix. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 12,126,400 years to get there.
How big is TOI-2379 b compared to Earth?
TOI-2379 b has 11.72 times the radius of Earth and about 1,831 times its mass.
How long is a year on TOI-2379 b?
One orbit around TOI-2379 takes 5.5 Earth days — short enough that 67 of its years would fit into one Earth year.
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