TOI-2207 b
TOI-2207 b is a hot Jupiter orbiting TOI-2207 in the constellation Microscopium. It lies about 1,218 light-years from Earth and was discovered in 2022 using the transit method.
How Big Is TOI-2207 b?
TOI-2207 b has a radius of 11.15 times that of Earth, or 1.00 times the radius of Jupiter. Its mass is 203 times that of Earth, giving it a density of 0.80 g/cm³ — closer to gas planets like Jupiter (1.33 g/cm³).
Is TOI-2207 b in the Habitable Zone?
TOI-2207 b orbits inside the inner edge of the habitable zone of TOI-2207. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of TOI-2207: 1.285–3.005 AU (conservative: 1.628–2.849 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-2207 b
The equilibrium temperature of TOI-2207 b is about 1,259 K (986 °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 406 times the stellar energy that Earth gets from the Sun.
Orbit and Year Length
A year on TOI-2207 b — one full orbit around TOI-2207 — lasts 8.00 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.085 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.17).
How Was TOI-2207 b Discovered?
TOI-2207 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-2207 b?
TOI-2207 b is 1,217.7 light-years (373.3 parsecs) from Earth. Light arriving here tonight left the planet about 1,218 years ago. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 21,431,520 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-2207 b scores 0.08, ranking #4,644 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-2207
TOI-2207
- Surface temperature
- 6,101 K (Sun: 5,772 K)
- Mass
- 1.30 M☉
- Radius
- 1.56 R☉
- Luminosity
- 3.0500 L☉
- Age
- 3.3 billion years (Sun: 4.6)
Planetary System
TOI-2207 b is the only planet known to orbit TOI-2207 so far.
TOI-2207 b — Complete Data
| Radius | 11.153 Earth radii (0.995 Jupiter radii) |
|---|---|
| Mass | 203.41 Earth masses (0.640 Jupiter masses) |
| Density | 0.80 g/cm³ (Earth: 5.51) |
| Orbital period | 8.00 days |
| Orbital distance | 0.085 AU |
| Eccentricity | 0.174 |
| Equilibrium temperature | 1,259 K (986 °C) |
| Stellar irradiation | 406.00× Earth |
| Earth Similarity Index | 0.08 |
| Distance from Earth | 1,217.7 light-years (373.3 parsecs) |
| Constellation | Microscopium |
| 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-2207 b
Is TOI-2207 b habitable?
No — TOI-2207 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-2207 b?
TOI-2207 b is about 1,218 light-years from Earth in the constellation Microscopium. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 21,431,520 years to get there.
How big is TOI-2207 b compared to Earth?
TOI-2207 b has 11.15 times the radius of Earth and about 203 times its mass.
How long is a year on TOI-2207 b?
One orbit around TOI-2207 takes 8.0 Earth days — short enough that 46 of its years would fit into one Earth year.
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