TOI-5788 c
TOI-5788 c 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 c?
TOI-5788 c has a radius of 2.27 times that of Earth. Its mass is 6.4 times that of Earth, giving it a density of 3.03 g/cm³ — between that of rocky and gaseous planets.
Is TOI-5788 c in the Habitable Zone?
TOI-5788 c 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 c
The equilibrium temperature of TOI-5788 c is about 667 K (394 °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 49.80 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-5788 c — one full orbit around TOI-5788 — lasts 16.2 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.120 AU — closer to its star than Mercury is to the Sun. Its orbit is nearly circular (eccentricity 0.046).
How Was TOI-5788 c Discovered?
TOI-5788 c 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 c?
TOI-5788 c 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 c is one of 2 known planets in the TOI-5788 system. Its siblings:
- TOI-5788 b (Super Earth)
TOI-5788 c — Complete Data
| Radius | 2.272 Earth radii (0.203 Jupiter radii) |
|---|---|
| Mass | 6.40 Earth masses (0.020 Jupiter masses) |
| Density | 3.03 g/cm³ (Earth: 5.51) |
| Orbital period | 16.21 days |
| Orbital distance | 0.120 AU |
| Eccentricity | 0.046 |
| Equilibrium temperature | 667 K (394 °C) |
| Stellar irradiation | 49.80× 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 c
Is TOI-5788 c habitable?
No — TOI-5788 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-5788 c?
TOI-5788 c 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 c compared to Earth?
TOI-5788 c has 2.27 times the radius of Earth and about 6.4 times its mass.
How long is a year on TOI-5788 c?
One orbit around TOI-5788 takes 16.2 Earth days — short enough that 23 of its years would fit into one Earth year.
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