TOI-2141 b
TOI-2141 b is a super-Earth orbiting TOI-2141 in the constellation Hercules. It lies about 253 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is TOI-2141 b?
TOI-2141 b has a radius of 3.15 times that of Earth. Its mass is 20.1 times that of Earth, giving it a density of 3.54 g/cm³ — between that of rocky and gaseous planets.
Is TOI-2141 b in the Habitable Zone?
TOI-2141 b orbits inside the inner edge of the habitable zone of TOI-2141. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-2141: 0.684–1.618 AU (conservative: 0.866–1.534 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-2141 b
The equilibrium temperature of TOI-2141 b is about 728 K (455 °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 47.30 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-2141 b — one full orbit around TOI-2141 — lasts 18.3 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.132 AU — closer to its star than Mercury is to the Sun.
How Was TOI-2141 b Discovered?
TOI-2141 b was discovered in 2023 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-2141 b?
TOI-2141 b is 253.4 light-years (77.7 parsecs) from Earth. Light arriving here tonight left the planet around the year 1773. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 4,459,840 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. TOI-2141 b scores 0.23, ranking #3,489 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-2141
TOI-2141
- Surface temperature
- 5,635 K (Sun: 5,772 K)
- Mass
- 0.90 M☉
- Radius
- 0.95 R☉
- Age
- 9.0 billion years (Sun: 4.6)
The TOI-2141 Planetary System
TOI-2141 b is one of 3 known planets in the TOI-2141 system. Its siblings:
- TOI-2141 c (Super Earth)
- TOI-2141 d (Neptune-like)
TOI-2141 b — Complete Data
| Radius | 3.147 Earth radii (0.281 Jupiter radii) |
|---|---|
| Mass | 20.10 Earth masses (0.063 Jupiter masses) |
| Density | 3.54 g/cm³ (Earth: 5.51) |
| Orbital period | 18.26 days |
| Orbital distance | 0.132 AU |
| Equilibrium temperature | 728 K (455 °C) |
| Stellar irradiation | 47.30× Earth |
| Earth Similarity Index | 0.23 |
| Distance from Earth | 253.4 light-years (77.7 parsecs) |
| Constellation | Hercules |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2025-09-25. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2141 b
Is TOI-2141 b habitable?
No — TOI-2141 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-2141 b?
TOI-2141 b is about 253 light-years from Earth in the constellation Hercules. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 4,459,840 years to get there.
How big is TOI-2141 b compared to Earth?
TOI-2141 b has 3.15 times the radius of Earth and about 20.1 times its mass.
How long is a year on TOI-2141 b?
One orbit around TOI-2141 takes 18.3 Earth days — short enough that 20 of its years would fit into one Earth year.
Explore TOI-2141 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.
