TOI-2420 b
TOI-2420 b is a hot Jupiter orbiting TOI-2420 in the constellation Cetus. It lies about 1,419 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-2420 b?
TOI-2420 b has a radius of 15.02 times that of Earth, or 1.34 times the radius of Jupiter. Its mass is 295 times that of Earth, giving it a density of 0.48 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-2420 b in the Habitable Zone?
The position of TOI-2420 b relative to the habitable zone of TOI-2420 cannot be precisely determined from the available orbital data.
Temperature on TOI-2420 b
The equilibrium temperature of TOI-2420 b is about 1,572 K (1,298 °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. It receives 1,017 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-2420 b — one full orbit around TOI-2420 — lasts 5.84 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.068 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.06).
How Was TOI-2420 b Discovered?
TOI-2420 b was discovered in 2024 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-2420 b?
TOI-2420 b is 1,419.3 light-years (435.2 parsecs) from Earth. Light arriving here tonight left the planet about 1,419 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 24,979,680 years to make the journey.
The Host Star: TOI-2420
TOI-2420
- Mass
- 1.16 M☉
- Radius
- 2.37 R☉
- Luminosity
- 4.8600 L☉
- Age
- 5.3 billion years (Sun: 4.6)
Planetary System
TOI-2420 b is the only planet known to orbit TOI-2420 so far.
TOI-2420 b — Complete Data
| Radius | 15.020 Earth radii (1.340 Jupiter radii) |
|---|---|
| Mass | 294.63 Earth masses (0.927 Jupiter masses) |
| Density | 0.48 g/cm³ (Earth: 5.51) |
| Orbital period | 5.84 days |
| Orbital distance | 0.068 AU |
| Eccentricity | 0.055 |
| Equilibrium temperature | 1,572 K (1,298 °C) |
| Stellar irradiation | 1,017.00× Earth |
| Distance from Earth | 1,419.3 light-years (435.2 parsecs) |
| Constellation | Cetus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-10-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2420 b
Is TOI-2420 b habitable?
TOI-2420 b is not known to orbit within the habitable zone of TOI-2420, and as a hot Jupiter it is an unlikely candidate for life as we know it.
How far away is TOI-2420 b?
TOI-2420 b is about 1,419 light-years from Earth in the constellation Cetus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 24,979,680 years to get there.
How big is TOI-2420 b compared to Earth?
TOI-2420 b has 15.02 times the radius of Earth and about 295 times its mass.
How long is a year on TOI-2420 b?
One orbit around TOI-2420 takes 5.8 Earth days — short enough that 63 of its years would fit into one Earth year.
Explore TOI-2420 b in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
