TOI-5786 b
TOI-5786 b is a hot Jupiter orbiting TOI-5786 in the constellation Cygnus. It lies about 628 light-years from Earth and was discovered in 2025 using the transit method.
How Big Is TOI-5786 b?
TOI-5786 b has a radius of 8.54 times that of Earth, or 0.76 times the radius of Jupiter. Its mass is 73.0 times that of Earth, giving it a density of 0.64 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-5786 b in the Habitable Zone?
TOI-5786 b orbits inside the inner edge of the habitable zone of TOI-5786. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-5786: 1.156–2.695 AU (conservative: 1.464–2.555 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-5786 b
The equilibrium temperature of TOI-5786 b is about 1,040 K (767 °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-5786 b — one full orbit around TOI-5786 — lasts 12.8 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.114 AU — closer to its star than Mercury is to the Sun.
How Was TOI-5786 b Discovered?
TOI-5786 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-5786 b?
TOI-5786 b is 627.8 light-years (192.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1399. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 11,049,280 years to make the journey.
The Host Star: TOI-5786
TOI-5786 b belongs to a system of 2 stars; it orbits TOI-5786.
TOI-5786
- Surface temperature
- 6,235 K (Sun: 5,772 K)
- Mass
- 1.23 M☉
- Radius
- 1.36 R☉
- Age
- 2.5 billion years (Sun: 4.6)
Planetary System
TOI-5786 b is the only planet known to orbit TOI-5786 so far.
TOI-5786 b — Complete Data
| Radius | 8.540 Earth radii (0.762 Jupiter radii) |
|---|---|
| Mass | 73.00 Earth masses (0.230 Jupiter masses) |
| Density | 0.64 g/cm³ (Earth: 5.51) |
| Orbital period | 12.78 days |
| Orbital distance | 0.114 AU |
| Equilibrium temperature | 1,040 K (767 °C) |
| Distance from Earth | 627.8 light-years (192.5 parsecs) |
| Constellation | Cygnus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-01-22. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-5786 b
Is TOI-5786 b habitable?
No — TOI-5786 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-5786 b?
TOI-5786 b is about 628 light-years from Earth in the constellation Cygnus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 11,049,280 years to get there.
How big is TOI-5786 b compared to Earth?
TOI-5786 b has 8.54 times the radius of Earth and about 73.0 times its mass.
How long is a year on TOI-5786 b?
One orbit around TOI-5786 takes 12.8 Earth days — short enough that 29 of its years would fit into one Earth year.
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