TOI-6420 b
TOI-6420 b is a hot Jupiter orbiting TOI-6420 in the constellation Puppis. It lies about 2,070 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-6420 b?
TOI-6420 b has a radius of 11.94 times that of Earth, or 1.07 times the radius of Jupiter. Its mass is 2,606 times that of Earth, giving it a density of 8.40 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is TOI-6420 b in the Habitable Zone?
TOI-6420 b orbits inside the inner edge of the habitable zone of TOI-6420. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-6420: 1.059–2.480 AU (conservative: 1.341–2.351 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-6420 b
The equilibrium temperature of TOI-6420 b is about 1,213 K (940 °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-6420 b — one full orbit around TOI-6420 — lasts 6.96 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.075 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.08).
How Was TOI-6420 b Discovered?
TOI-6420 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-6420 b?
TOI-6420 b is 2,070.2 light-years (634.7 parsecs) from Earth. Light arriving here tonight left the planet about 2,070 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 36,435,520 years to make the journey.
The Host Star: TOI-6420
TOI-6420
- Surface temperature
- 6,020 K (Sun: 5,772 K)
- Mass
- 1.17 M☉
- Radius
- 1.31 R☉
- Luminosity
- 2.0500 L☉
- Age
- 4.4 billion years (Sun: 4.6)
Planetary System
TOI-6420 b is the only planet known to orbit TOI-6420 so far.
TOI-6420 b — Complete Data
| Radius | 11.938 Earth radii (1.065 Jupiter radii) |
|---|---|
| Mass | 2,606.19 Earth masses (8.200 Jupiter masses) |
| Density | 8.40 g/cm³ (Earth: 5.51) |
| Orbital period | 6.96 days |
| Orbital distance | 0.075 AU |
| Eccentricity | 0.078 |
| Equilibrium temperature | 1,213 K (940 °C) |
| Distance from Earth | 2,070.2 light-years (634.7 parsecs) |
| Constellation | Puppis |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-09-25. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-6420 b
Is TOI-6420 b habitable?
No — TOI-6420 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-6420 b?
TOI-6420 b is about 2,070 light-years from Earth in the constellation Puppis. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 36,435,520 years to get there.
How big is TOI-6420 b compared to Earth?
TOI-6420 b has 11.94 times the radius of Earth and about 2,606 times its mass.
How long is a year on TOI-6420 b?
One orbit around TOI-6420 takes 7.0 Earth days — short enough that 52 of its years would fit into one Earth year.
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