TOI-6324 b
TOI-6324 b is a terrestrial planet orbiting TOI-6324 in the constellation Cepheus. It lies about 67 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-6324 b?
TOI-6324 b has a radius of 1.06 times that of Earth. Its mass is 1.2 times that of Earth.
Is TOI-6324 b in the Habitable Zone?
The position of TOI-6324 b relative to the habitable zone of TOI-6324 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-6324: 0.076–0.199 AU (conservative: 0.096–0.189 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-6324 b
The equilibrium temperature of TOI-6324 b is about 1,216 K (943 °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-6324 b — one full orbit around TOI-6324 — lasts just 6.7 hours, shorter than Mercury's 88-day year.
How Was TOI-6324 b Discovered?
TOI-6324 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-6324 b?
TOI-6324 b is 67.0 light-years (20.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1959. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,179,200 years to make the journey.
The Host Star: TOI-6324
TOI-6324
- Surface temperature
- 3,247 K (Sun: 5,772 K)
- Mass
- 0.27 M☉
- Radius
- 0.29 R☉
Planetary System
TOI-6324 b is the only planet known to orbit TOI-6324 so far.
TOI-6324 b — Complete Data
| Radius | 1.059 Earth radii (0.094 Jupiter radii) |
|---|---|
| Mass | 1.17 Earth masses (0.004 Jupiter masses) |
| Orbital period | 0.28 days |
| Equilibrium temperature | 1,216 K (943 °C) |
| Distance from Earth | 67.0 light-years (20.5 parsecs) |
| Constellation | Cepheus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-05-05. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-6324 b
Is TOI-6324 b habitable?
TOI-6324 b is not known to orbit within the habitable zone of TOI-6324, and as a terrestrial planet it is an unlikely candidate for life as we know it.
How far away is TOI-6324 b?
TOI-6324 b is about 67 light-years from Earth in the constellation Cepheus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,179,200 years to get there.
How big is TOI-6324 b compared to Earth?
TOI-6324 b has 1.06 times the radius of Earth and about 1.2 times its mass.
How long is a year on TOI-6324 b?
One orbit around TOI-6324 takes 0.3 Earth days — short enough that 1,308 of its years would fit into one Earth year.
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