TOI-712 b
TOI-712 b is a mini-Neptune orbiting the K4.5 V star TOI-712 in the constellation Dorado. It lies about 191 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is TOI-712 b?
TOI-712 b has a radius of 2.05 times that of Earth.
Is TOI-712 b in the Habitable Zone?
TOI-712 b orbits inside the inner edge of the habitable zone of TOI-712. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-712: 0.344–0.846 AU (conservative: 0.436–0.802 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Temperature on TOI-712 b
The equilibrium temperature of TOI-712 b is about 650 K (377 °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 22.60 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-712 b — one full orbit around TOI-712 — lasts 9.53 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.079 AU — closer to its star than Mercury is to the Sun. Its orbit is highly elliptical (eccentricity 0.54), swinging dramatically closer to and farther from its star.
How Was TOI-712 b Discovered?
TOI-712 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-712 b?
TOI-712 b is 191.2 light-years (58.6 parsecs) from Earth. Light arriving here tonight left the planet around the year 1835. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,365,120 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-712 b scores 0.29, ranking #1,904 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-712
TOI-712
- Spectral type
- K4.5 V
- Surface temperature
- 4,622 K (Sun: 5,772 K)
- Mass
- 0.73 M☉
- Radius
- 0.67 R☉
- Luminosity
- 0.1871 L☉
- Age
- 0.8 billion years (Sun: 4.6)
The TOI-712 Planetary System
TOI-712 b is one of 3 known planets in the TOI-712 system. Its siblings:
TOI-712 b — Complete Data
| Radius | 2.049 Earth radii (0.183 Jupiter radii) |
|---|---|
| Orbital period | 9.53 days |
| Orbital distance | 0.079 AU |
| Eccentricity | 0.540 |
| Equilibrium temperature | 650 K (377 °C) |
| Stellar irradiation | 22.60× Earth |
| Earth Similarity Index | 0.29 |
| Distance from Earth | 191.2 light-years (58.6 parsecs) |
| Constellation | Dorado |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2022-08-29. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-712 b
Is TOI-712 b habitable?
No — TOI-712 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-712 b?
TOI-712 b is about 191 light-years from Earth in the constellation Dorado. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,365,120 years to get there.
How big is TOI-712 b compared to Earth?
TOI-712 b has 2.05 times the radius of Earth.
How long is a year on TOI-712 b?
One orbit around TOI-712 takes 9.5 Earth days — short enough that 38 of its years would fit into one Earth year.
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