TOI-2136 b
TOI-2136 b is a super-Earth orbiting the M4.5 V star TOI-2136 in the constellation Lyra. It lies about 109 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is TOI-2136 b?
TOI-2136 b has a radius of 2.19 times that of Earth. Its mass is 6.4 times that of Earth, giving it a density of 3.34 g/cm³ — between that of rocky and gaseous planets.
Is TOI-2136 b in the Habitable Zone?
TOI-2136 b orbits inside the inner edge of the habitable zone of TOI-2136. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-2136: 0.093–0.244 AU (conservative: 0.118–0.232 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-2136 b
The equilibrium temperature of TOI-2136 b is about 395 K (122 °C) — hotter than anywhere on Earth. This estimate ignores any atmosphere, which could change surface temperatures dramatically — Earth's greenhouse effect adds about 33 °C. It receives 4.00 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-2136 b — one full orbit around TOI-2136 — lasts 7.85 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.057 AU — closer to its star than Mercury is to the Sun.
How Was TOI-2136 b Discovered?
TOI-2136 b was discovered in 2022 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-2136 b?
TOI-2136 b is 108.8 light-years (33.4 parsecs) from Earth. Light arriving here tonight left the planet around the year 1918. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,914,880 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-2136 b scores 0.50, ranking #252 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-2136
TOI-2136
- Spectral type
- M4.5 V
- Surface temperature
- 3,342 K (Sun: 5,772 K)
- Mass
- 0.34 M☉
- Radius
- 0.34 R☉
- Luminosity
- 0.0130 L☉
- Age
- 4.6 billion years (Sun: 4.6)
Planetary System
TOI-2136 b is the only planet known to orbit TOI-2136 so far.
TOI-2136 b — Complete Data
| Radius | 2.190 Earth radii (0.195 Jupiter radii) |
|---|---|
| Mass | 6.37 Earth masses (0.020 Jupiter masses) |
| Density | 3.34 g/cm³ (Earth: 5.51) |
| Orbital period | 7.85 days |
| Orbital distance | 0.057 AU |
| Equilibrium temperature | 395 K (122 °C) |
| Stellar irradiation | 4.00× Earth |
| Earth Similarity Index | 0.50 |
| Distance from Earth | 108.8 light-years (33.4 parsecs) |
| Constellation | Lyra |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2022-07-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2136 b
Is TOI-2136 b habitable?
No — TOI-2136 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-2136 b?
TOI-2136 b is about 109 light-years from Earth in the constellation Lyra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,914,880 years to get there.
How big is TOI-2136 b compared to Earth?
TOI-2136 b has 2.19 times the radius of Earth and about 6.4 times its mass.
How long is a year on TOI-2136 b?
One orbit around TOI-2136 takes 7.9 Earth days — short enough that 47 of its years would fit into one Earth year.
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