TOI-836 b
TOI-836 b is a super-Earth orbiting the K V star TOI-836 in the constellation Libra. It lies about 90 light-years from Earth and was discovered in 2023 using the transit method.
How Big Is TOI-836 b?
TOI-836 b has a radius of 1.70 times that of Earth. Its mass is 4.5 times that of Earth, giving it a density of 5.02 g/cm³ — comparable to rocky planets like Earth (5.51 g/cm³).
Is TOI-836 b in the Habitable Zone?
TOI-836 b orbits inside the inner edge of the habitable zone of TOI-836. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-836: 0.329–0.812 AU (conservative: 0.417–0.770 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-836 b
The equilibrium temperature of TOI-836 b is about 871 K (598 °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 78.84 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-836 b — one full orbit around TOI-836 — lasts 3.82 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.042 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.05).
How Was TOI-836 b Discovered?
TOI-836 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-836 b?
TOI-836 b is 89.7 light-years (27.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1937. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 1,578,720 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-836 b scores 0.29, ranking #2,016 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-836
TOI-836
- Spectral type
- K V
- Surface temperature
- 4,552 K (Sun: 5,772 K)
- Mass
- 0.68 M☉
- Radius
- 0.67 R☉
- Age
- 5.4 billion years (Sun: 4.6)
The TOI-836 Planetary System
TOI-836 b is one of 2 known planets in the TOI-836 system. Its siblings:
- TOI-836.01 (Super Earth)
TOI-836 b — Complete Data
| Radius | 1.704 Earth radii (0.152 Jupiter radii) |
|---|---|
| Mass | 4.53 Earth masses (0.014 Jupiter masses) |
| Density | 5.02 g/cm³ (Earth: 5.51) |
| Orbital period | 3.82 days |
| Orbital distance | 0.042 AU |
| Eccentricity | 0.053 |
| Equilibrium temperature | 871 K (598 °C) |
| Stellar irradiation | 78.84× Earth |
| Earth Similarity Index | 0.29 |
| Distance from Earth | 89.7 light-years (27.5 parsecs) |
| Constellation | Libra |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2023 |
Data: NASA Exoplanet Archive, last updated 2023-02-25. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-836 b
Is TOI-836 b habitable?
No — TOI-836 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-836 b?
TOI-836 b is about 90 light-years from Earth in the constellation Libra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 1,578,720 years to get there.
How big is TOI-836 b compared to Earth?
TOI-836 b has 1.70 times the radius of Earth and about 4.5 times its mass.
How long is a year on TOI-836 b?
One orbit around TOI-836 takes 3.8 Earth days — short enough that 96 of its years would fit into one Earth year.
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