TOI-4465 b
TOI-4465 b is a cold gas giant orbiting the G V star TOI-4465 in the constellation Hercules. It lies about 395 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-4465 b?
TOI-4465 b has a radius of 14.01 times that of Earth, or 1.25 times the radius of Jupiter. Its mass is 1,872 times that of Earth, giving it a density of 3.73 g/cm³ — between that of rocky and gaseous planets.
Is TOI-4465 b in the Habitable Zone?
TOI-4465 b orbits inside the inner edge of the habitable zone of TOI-4465. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-4465: 0.711–1.685 AU (conservative: 0.900–1.598 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Temperature on TOI-4465 b
The equilibrium temperature of TOI-4465 b is about 427 K (154 °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.
Orbit and Year Length
A year on TOI-4465 b — one full orbit around TOI-4465 — lasts 101.9 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.416 AU — comparable to the inner Solar System. Its orbit is mildly elliptical (eccentricity 0.24).
How Was TOI-4465 b Discovered?
TOI-4465 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-4465 b?
TOI-4465 b is 395.1 light-years (121.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1631. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 6,953,760 years to make the journey.
The Host Star: TOI-4465
TOI-4465
- Spectral type
- G V
- Surface temperature
- 5,545 K (Sun: 5,772 K)
- Mass
- 0.93 M☉
- Radius
- 1.01 R☉
Planetary System
TOI-4465 b is the only planet known to orbit TOI-4465 so far.
TOI-4465 b — Complete Data
| Radius | 14.011 Earth radii (1.250 Jupiter radii) |
|---|---|
| Mass | 1,872.01 Earth masses (5.890 Jupiter masses) |
| Density | 3.73 g/cm³ (Earth: 5.51) |
| Orbital period | 101.94 days |
| Orbital distance | 0.416 AU |
| Eccentricity | 0.240 |
| Equilibrium temperature | 427 K (154 °C) |
| Distance from Earth | 395.1 light-years (121.1 parsecs) |
| Constellation | Hercules |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-07-17. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-4465 b
Is TOI-4465 b habitable?
No — TOI-4465 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-4465 b?
TOI-4465 b is about 395 light-years from Earth in the constellation Hercules. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 6,953,760 years to get there.
How big is TOI-4465 b compared to Earth?
TOI-4465 b has 14.01 times the radius of Earth and about 1,872 times its mass.
How long is a year on TOI-4465 b?
One orbit around TOI-4465 takes 101.9 Earth days.
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