TOI-5788 b
TOI-5788 b is a super-Earth orbiting TOI-5788 in the constellation Lyra. It lies about 318 light-years from Earth and was discovered in 2026 using the transit method.
How Big Is TOI-5788 b?
TOI-5788 b has a radius of 1.53 times that of Earth. Its mass is 3.7 times that of Earth, giving it a density of 5.73 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is TOI-5788 b in the Habitable Zone?
TOI-5788 b orbits inside the inner edge of the habitable zone of TOI-5788. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-5788: 0.639–1.513 AU (conservative: 0.810–1.435 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-5788 b
The equilibrium temperature of TOI-5788 b is about 910 K (637 °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 175 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-5788 b — one full orbit around TOI-5788 — lasts 6.34 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.064 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.06).
How Was TOI-5788 b Discovered?
TOI-5788 b was discovered in 2026 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-5788 b?
TOI-5788 b is 318.4 light-years (97.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1708. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 5,603,840 years to make the journey.
The Host Star: TOI-5788
TOI-5788
- Surface temperature
- 5,615 K (Sun: 5,772 K)
- Mass
- 0.87 M☉
- Radius
- 0.87 R☉
- Luminosity
- 0.7120 L☉
- Age
- 5.7 billion years (Sun: 4.6)
The TOI-5788 Planetary System
TOI-5788 b is one of 2 known planets in the TOI-5788 system. Its siblings:
- TOI-5788 c (Super Earth)
TOI-5788 b — Complete Data
| Radius | 1.528 Earth radii (0.136 Jupiter radii) |
|---|---|
| Mass | 3.72 Earth masses (0.012 Jupiter masses) |
| Density | 5.73 g/cm³ (Earth: 5.51) |
| Orbital period | 6.34 days |
| Orbital distance | 0.064 AU |
| Eccentricity | 0.061 |
| Equilibrium temperature | 910 K (637 °C) |
| Stellar irradiation | 175.10× Earth |
| Distance from Earth | 318.4 light-years (97.6 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2026 |
Data: NASA Exoplanet Archive, last updated 2026-02-05. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-5788 b
Is TOI-5788 b habitable?
No — TOI-5788 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-5788 b?
TOI-5788 b is about 318 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 5,603,840 years to get there.
How big is TOI-5788 b compared to Earth?
TOI-5788 b has 1.53 times the radius of Earth and about 3.7 times its mass.
How long is a year on TOI-5788 b?
One orbit around TOI-5788 takes 6.3 Earth days — short enough that 58 of its years would fit into one Earth year.
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