TOI-2196 b
TOI-2196 b is a super-Earth orbiting the G V star TOI-2196 in the constellation Pavo. It lies about 848 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is TOI-2196 b?
TOI-2196 b has a radius of 3.51 times that of Earth. Its mass is 26.0 times that of Earth, giving it a density of 3.31 g/cm³ — between that of rocky and gaseous planets.
Is TOI-2196 b in the Habitable Zone?
TOI-2196 b orbits inside the inner edge of the habitable zone of TOI-2196. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-2196: 0.753–1.781 AU (conservative: 0.954–1.689 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-2196 b
The equilibrium temperature of TOI-2196 b is about 1,860 K (1,587 °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 2,000 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-2196 b — one full orbit around TOI-2196 — lasts just 28.7 hours, shorter than Mercury's 88-day year. It orbits at an average distance of 0.022 AU — closer to its star than Mercury is to the Sun.
How Was TOI-2196 b Discovered?
TOI-2196 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-2196 b?
TOI-2196 b is 847.8 light-years (259.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1179. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 14,921,280 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-2196 b scores 0.19, ranking #3,961 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-2196
TOI-2196
- Spectral type
- G V
- Surface temperature
- 5,634 K (Sun: 5,772 K)
- Mass
- 1.03 M☉
- Radius
- 1.04 R☉
- Luminosity
- 0.9900 L☉
- Age
- 4.5 billion years (Sun: 4.6)
Planetary System
TOI-2196 b is the only planet known to orbit TOI-2196 so far.
TOI-2196 b — Complete Data
| Radius | 3.510 Earth radii (0.313 Jupiter radii) |
|---|---|
| Mass | 26.00 Earth masses (0.082 Jupiter masses) |
| Density | 3.31 g/cm³ (Earth: 5.51) |
| Orbital period | 1.19 days |
| Orbital distance | 0.022 AU |
| Equilibrium temperature | 1,860 K (1,587 °C) |
| Stellar irradiation | 2,000.00× Earth |
| Earth Similarity Index | 0.19 |
| Distance from Earth | 847.8 light-years (259.9 parsecs) |
| Constellation | Pavo |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2022-08-23. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2196 b
Is TOI-2196 b habitable?
No — TOI-2196 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-2196 b?
TOI-2196 b is about 848 light-years from Earth in the constellation Pavo. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 14,921,280 years to get there.
How big is TOI-2196 b compared to Earth?
TOI-2196 b has 3.51 times the radius of Earth and about 26.0 times its mass.
How long is a year on TOI-2196 b?
One orbit around TOI-2196 takes 1.2 Earth days — short enough that 306 of its years would fit into one Earth year.
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