TOI-1691 b
TOI-1691 b is a sub-Neptune orbiting TOI-1691 in the constellation Ursa Minor. It lies about 364 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-1691 b?
TOI-1691 b has a radius of 3.66 times that of Earth.
Is TOI-1691 b in the Habitable Zone?
TOI-1691 b orbits inside the inner edge of the habitable zone of TOI-1691. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-1691: 0.746–1.759 AU (conservative: 0.945–1.668 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Temperature on TOI-1691 b
TOI-1691 b receives 59.13 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-1691 b — one full orbit around TOI-1691 — lasts 16.7 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.129 AU — closer to its star than Mercury is to the Sun.
How Was TOI-1691 b Discovered?
TOI-1691 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-1691 b?
TOI-1691 b is 363.5 light-years (111.4 parsecs) from Earth. Light arriving here tonight left the planet around the year 1663. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 6,397,600 years to make the journey.
The Host Star: TOI-1691
TOI-1691
- Surface temperature
- 5,759 K (Sun: 5,772 K)
- Mass
- 1.03 M☉
- Radius
- 1.00 R☉
Planetary System
TOI-1691 b is the only planet known to orbit TOI-1691 so far.
TOI-1691 b — Complete Data
| Radius | 3.660 Earth radii (0.327 Jupiter radii) |
|---|---|
| Orbital period | 16.74 days |
| Orbital distance | 0.129 AU |
| Stellar irradiation | 59.13× Earth |
| Distance from Earth | 363.5 light-years (111.4 parsecs) |
| Constellation | Ursa Minor |
| 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-1691 b
Is TOI-1691 b habitable?
No — TOI-1691 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-1691 b?
TOI-1691 b is about 364 light-years from Earth in the constellation Ursa Minor. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 6,397,600 years to get there.
How big is TOI-1691 b compared to Earth?
TOI-1691 b has 3.66 times the radius of Earth.
How long is a year on TOI-1691 b?
One orbit around TOI-1691 takes 16.7 Earth days — short enough that 22 of its years would fit into one Earth year.
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