TOI-5688 A b
TOI-5688 A b is a hot Jupiter orbiting TOI-5688 A in the constellation Hercules. It lies about 738 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-5688 A b?
TOI-5688 A b has a radius of 10.30 times that of Earth, or 0.92 times the radius of Jupiter. Its mass is 124 times that of Earth, giving it a density of 0.61 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-5688 A b in the Habitable Zone?
TOI-5688 A b orbits inside the inner edge of the habitable zone of TOI-5688 A. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-5688 A: 0.198–0.509 AU (conservative: 0.251–0.483 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-5688 A b
The equilibrium temperature of TOI-5688 A b is about 742 K (469 °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 50.30 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-5688 A b — one full orbit around TOI-5688 A — lasts 2.95 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.034 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.13).
How Was TOI-5688 A b Discovered?
TOI-5688 A 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-5688 A b?
TOI-5688 A b is 738.1 light-years (226.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1288. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 12,990,560 years to make the journey.
The Host Star: TOI-5688 A
TOI-5688 A b belongs to a system of 2 stars; it orbits TOI-5688 A.
TOI-5688 A
- Surface temperature
- 3,713 K (Sun: 5,772 K)
- Mass
- 0.60 M☉
- Radius
- 0.57 R☉
- Luminosity
- 0.0591 L☉
- Age
- 7.2 billion years (Sun: 4.6)
Planetary System
TOI-5688 A b is the only planet known to orbit TOI-5688 A so far.
TOI-5688 A b — Complete Data
| Radius | 10.300 Earth radii (0.920 Jupiter radii) |
|---|---|
| Mass | 124.00 Earth masses (0.390 Jupiter masses) |
| Density | 0.61 g/cm³ (Earth: 5.51) |
| Orbital period | 2.95 days |
| Orbital distance | 0.034 AU |
| Eccentricity | 0.128 |
| Equilibrium temperature | 742 K (469 °C) |
| Stellar irradiation | 50.30× Earth |
| Distance from Earth | 738.1 light-years (226.3 parsecs) |
| Constellation | Hercules |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2025-01-09. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-5688 A b
Is TOI-5688 A b habitable?
No — TOI-5688 A b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-5688 A b?
TOI-5688 A b is about 738 light-years from Earth in the constellation Hercules. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 12,990,560 years to get there.
How big is TOI-5688 A b compared to Earth?
TOI-5688 A b has 10.30 times the radius of Earth and about 124 times its mass.
How long is a year on TOI-5688 A b?
One orbit around TOI-5688 A takes 2.9 Earth days — short enough that 124 of its years would fit into one Earth year.
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