TOI-871 b
TOI-871 b is a super-Earth orbiting TOI-871 in the constellation Pictor. It lies about 222 light-years from Earth and was discovered in 2024 using the transit method.
How Big Is TOI-871 b?
TOI-871 b has a radius of 1.66 times that of Earth.
Is TOI-871 b in the Habitable Zone?
TOI-871 b orbits inside the inner edge of the habitable zone of TOI-871. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-871: 0.412–1.000 AU (conservative: 0.522–0.948 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-871 b
The equilibrium temperature of TOI-871 b is about 621 K (348 °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 24.78 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-871 b — one full orbit around TOI-871 — lasts 14.4 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.105 AU — closer to its star than Mercury is to the Sun.
How Was TOI-871 b Discovered?
TOI-871 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-871 b?
TOI-871 b is 221.9 light-years (68.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1805. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,905,440 years to make the journey.
The Host Star: TOI-871
TOI-871
- Surface temperature
- 4,929 K (Sun: 5,772 K)
- Mass
- 0.76 M☉
- Radius
- 0.72 R☉
- Luminosity
- 0.2754 L☉
- Age
- 5.9 billion years (Sun: 4.6)
Planetary System
TOI-871 b is the only planet known to orbit TOI-871 so far.
TOI-871 b — Complete Data
| Radius | 1.664 Earth radii (0.148 Jupiter radii) |
|---|---|
| Orbital period | 14.36 days |
| Orbital distance | 0.105 AU |
| Equilibrium temperature | 621 K (348 °C) |
| Stellar irradiation | 24.78× Earth |
| Distance from Earth | 221.9 light-years (68.0 parsecs) |
| Constellation | Pictor |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-04-15. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-871 b
Is TOI-871 b habitable?
No — TOI-871 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-871 b?
TOI-871 b is about 222 light-years from Earth in the constellation Pictor. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,905,440 years to get there.
How big is TOI-871 b compared to Earth?
TOI-871 b has 1.66 times the radius of Earth.
How long is a year on TOI-871 b?
One orbit around TOI-871 takes 14.4 Earth days — short enough that 25 of its years would fit into one Earth year.
Explore TOI-871 b in the app
Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.
