TOI-2328 b
TOI-2328 b is a cold gas giant orbiting TOI-2328 in the constellation Hydrus. It lies about 756 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-2328 b?
TOI-2328 b has a radius of 9.98 times that of Earth, or 0.89 times the radius of Jupiter. Its mass is 50.9 times that of Earth, giving it a density of 0.29 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-2328 b in the Habitable Zone?
TOI-2328 b orbits inside the inner edge of the habitable zone of TOI-2328. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-2328: 0.626–1.486 AU (conservative: 0.793–1.409 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-2328 b
The equilibrium temperature of TOI-2328 b is about 842 K (569 °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.
Orbit and Year Length
A year on TOI-2328 b — one full orbit around TOI-2328 — lasts 17.1 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.127 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.06).
How Was TOI-2328 b Discovered?
TOI-2328 b was discovered in 2025 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-2328 b?
TOI-2328 b is 756.0 light-years (231.8 parsecs) from Earth. Light arriving here tonight left the planet around the year 1270. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 13,305,600 years to make the journey.
The Host Star: TOI-2328
TOI-2328
- Surface temperature
- 5,525 K (Sun: 5,772 K)
- Mass
- 0.95 M☉
- Radius
- 0.90 R☉
- Luminosity
- 0.6760 L☉
- Age
- 4.0 billion years (Sun: 4.6)
Planetary System
TOI-2328 b is the only planet known to orbit TOI-2328 so far.
TOI-2328 b — Complete Data
| Radius | 9.976 Earth radii (0.890 Jupiter radii) |
|---|---|
| Mass | 50.85 Earth masses (0.160 Jupiter masses) |
| Density | 0.29 g/cm³ (Earth: 5.51) |
| Orbital period | 17.10 days |
| Orbital distance | 0.127 AU |
| Eccentricity | 0.057 |
| Equilibrium temperature | 842 K (569 °C) |
| Distance from Earth | 756.0 light-years (231.8 parsecs) |
| Constellation | Hydrus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-03-03. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2328 b
Is TOI-2328 b habitable?
No — TOI-2328 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-2328 b?
TOI-2328 b is about 756 light-years from Earth in the constellation Hydrus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 13,305,600 years to get there.
How big is TOI-2328 b compared to Earth?
TOI-2328 b has 9.98 times the radius of Earth and about 50.9 times its mass.
How long is a year on TOI-2328 b?
One orbit around TOI-2328 takes 17.1 Earth days — short enough that 21 of its years would fit into one Earth year.
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