TOI-6330 b
TOI-6330 b is a hot Jupiter orbiting TOI-6330 in the constellation Cassiopeia. It lies about 454 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-6330 b?
TOI-6330 b has a radius of 10.89 times that of Earth, or 0.97 times the radius of Jupiter. Its mass is 3,179 times that of Earth, giving it a density of 13.57 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is TOI-6330 b in the Habitable Zone?
TOI-6330 b orbits inside the inner edge of the habitable zone of TOI-6330. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-6330: 0.157–0.407 AU (conservative: 0.199–0.386 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-6330 b
The equilibrium temperature of TOI-6330 b is about 495 K (222 °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. It receives 9.97 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-6330 b — one full orbit around TOI-6330 — lasts 6.85 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.058 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-6330 b Discovered?
TOI-6330 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-6330 b?
TOI-6330 b is 453.5 light-years (139.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1573. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 7,981,600 years to make the journey.
The Host Star: TOI-6330
TOI-6330
- Surface temperature
- 3,539 K (Sun: 5,772 K)
- Mass
- 0.53 M☉
- Radius
- 0.49 R☉
- Luminosity
- 0.0370 L☉
- Age
- 7.6 billion years (Sun: 4.6)
Planetary System
TOI-6330 b is the only planet known to orbit TOI-6330 so far.
TOI-6330 b — Complete Data
| Radius | 10.890 Earth radii (0.972 Jupiter radii) |
|---|---|
| Mass | 3,179.00 Earth masses (10.000 Jupiter masses) |
| Density | 13.57 g/cm³ (Earth: 5.51) |
| Orbital period | 6.85 days |
| Orbital distance | 0.058 AU |
| Eccentricity | 0.340 |
| Equilibrium temperature | 495 K (222 °C) |
| Stellar irradiation | 9.97× Earth |
| Distance from Earth | 453.5 light-years (139.0 parsecs) |
| Constellation | Cassiopeia |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-09-17. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-6330 b
Is TOI-6330 b habitable?
No — TOI-6330 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-6330 b?
TOI-6330 b is about 454 light-years from Earth in the constellation Cassiopeia. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 7,981,600 years to get there.
How big is TOI-6330 b compared to Earth?
TOI-6330 b has 10.89 times the radius of Earth and about 3,179 times its mass.
How long is a year on TOI-6330 b?
One orbit around TOI-6330 takes 6.9 Earth days — short enough that 53 of its years would fit into one Earth year.
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