TOI-5218 b
TOI-5218 b is a hot Jupiter orbiting TOI-5218 in the constellation Draco. It lies about 1,231 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-5218 b?
TOI-5218 b has a radius of 9.86 times that of Earth, or 0.88 times the radius of Jupiter. Its mass is 657 times that of Earth.
Is TOI-5218 b in the Habitable Zone?
TOI-5218 b orbits inside the inner edge of the habitable zone of TOI-5218. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-5218: 0.312–0.782 AU (conservative: 0.396–0.741 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-5218 b
The equilibrium temperature of TOI-5218 b is about 783 K (510 °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 62.00 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-5218 b — one full orbit around TOI-5218 — lasts 4.29 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.047 AU — closer to its star than Mercury is to the Sun.
How Was TOI-5218 b Discovered?
TOI-5218 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-5218 b?
TOI-5218 b is 1,231.2 light-years (377.5 parsecs) from Earth. Light arriving here tonight left the planet about 1,231 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 21,669,120 years to make the journey.
The Host Star: TOI-5218
TOI-5218
- Surface temperature
- 4,230 K (Sun: 5,772 K)
- Mass
- 0.74 M☉
- Radius
- 0.71 R☉
- Luminosity
- 0.1500 L☉
- Age
- 6.7 billion years (Sun: 4.6)
Planetary System
TOI-5218 b is the only planet known to orbit TOI-5218 so far.
TOI-5218 b — Complete Data
| Radius | 9.860 Earth radii (0.879 Jupiter radii) |
|---|---|
| Mass | 657.00 Earth masses (2.067 Jupiter masses) |
| Orbital period | 4.29 days |
| Orbital distance | 0.047 AU |
| Equilibrium temperature | 783 K (510 °C) |
| Stellar irradiation | 62.00× Earth |
| Distance from Earth | 1,231.2 light-years (377.5 parsecs) |
| Constellation | Draco |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-08-30. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-5218 b
Is TOI-5218 b habitable?
No — TOI-5218 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-5218 b?
TOI-5218 b is about 1,231 light-years from Earth in the constellation Draco. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 21,669,120 years to get there.
How big is TOI-5218 b compared to Earth?
TOI-5218 b has 9.86 times the radius of Earth and about 657 times its mass.
How long is a year on TOI-5218 b?
One orbit around TOI-5218 takes 4.3 Earth days — short enough that 85 of its years would fit into one Earth year.
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