TOI-1799 b
TOI-1799 b is a super-Earth orbiting TOI-1799 in the constellation Ursa Major. It lies about 203 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-1799 b?
TOI-1799 b has a radius of 1.64 times that of Earth.
Is TOI-1799 b in the Habitable Zone?
TOI-1799 b orbits inside the inner edge of the habitable zone of TOI-1799. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1799: 0.700–1.654 AU (conservative: 0.887–1.568 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-1799 b
TOI-1799 b receives 164 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-1799 b — one full orbit around TOI-1799 — lasts 7.09 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.073 AU — closer to its star than Mercury is to the Sun.
How Was TOI-1799 b Discovered?
TOI-1799 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-1799 b?
TOI-1799 b is 202.6 light-years (62.1 parsecs) from Earth. Light arriving here tonight left the planet around the year 1824. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,565,760 years to make the journey.
The Host Star: TOI-1799
TOI-1799
- Surface temperature
- 5,690 K (Sun: 5,772 K)
- Mass
- 1.01 M☉
- Radius
- 0.96 R☉
Planetary System
TOI-1799 b is the only planet known to orbit TOI-1799 so far.
TOI-1799 b — Complete Data
| Radius | 1.642 Earth radii (0.146 Jupiter radii) |
|---|---|
| Orbital period | 7.09 days |
| Orbital distance | 0.073 AU |
| Stellar irradiation | 164.26× Earth |
| Distance from Earth | 202.6 light-years (62.1 parsecs) |
| Constellation | Ursa Major |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-12-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1799 b
Is TOI-1799 b habitable?
No — TOI-1799 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1799 b?
TOI-1799 b is about 203 light-years from Earth in the constellation Ursa Major. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,565,760 years to get there.
How big is TOI-1799 b compared to Earth?
TOI-1799 b has 1.64 times the radius of Earth.
How long is a year on TOI-1799 b?
One orbit around TOI-1799 takes 7.1 Earth days — short enough that 51 of its years would fit into one Earth year.
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