TOI-2202 b
TOI-2202 b is a cold gas giant orbiting TOI-2202 in the constellation Hydrus. It lies about 770 light-years from Earth and was discovered in 2021 using the transit method.
How Big Is TOI-2202 b?
TOI-2202 b has a radius of 10.95 times that of Earth, or 0.98 times the radius of Jupiter. Its mass is 287 times that of Earth.
Is TOI-2202 b in the Habitable Zone?
The position of TOI-2202 b relative to the habitable zone of TOI-2202 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-2202: 0.502–1.207 AU (conservative: 0.636–1.144 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 ›
Orbit and Year Length
A year on TOI-2202 b — one full orbit around TOI-2202 — lasts 11.9 Earth days, shorter than Mercury's 88-day year. Its orbit is nearly circular (eccentricity 0.022).
How Was TOI-2202 b Discovered?
TOI-2202 b was discovered in 2021 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-2202 b?
TOI-2202 b is 769.5 light-years (235.9 parsecs) from Earth. Light arriving here tonight left the planet around the year 1257. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 13,543,200 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-2202 b scores 0.10, ranking #4,427 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: TOI-2202
TOI-2202
- Surface temperature
- 5,169 K (Sun: 5,772 K)
- Mass
- 0.84 M☉
- Radius
- 0.81 R☉
- Age
- 6.4 billion years (Sun: 4.6)
The TOI-2202 Planetary System
TOI-2202 b is one of 2 known planets in the TOI-2202 system. Its siblings:
- TOI-2202 c (Cold Gas Giant)
TOI-2202 b — Complete Data
| Radius | 10.951 Earth radii (0.977 Jupiter radii) |
|---|---|
| Mass | 287.32 Earth masses (0.904 Jupiter masses) |
| Orbital period | 11.91 days |
| Eccentricity | 0.022 |
| Earth Similarity Index | 0.10 |
| Distance from Earth | 769.5 light-years (235.9 parsecs) |
| Constellation | Hydrus |
| Discovery method | Transit |
| Discovery facility | Transiting Exoplanet Survey Satellite (TESS) |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2025-04-16. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2202 b
Is TOI-2202 b habitable?
TOI-2202 b is not known to orbit within the habitable zone of TOI-2202, and as a cold gas giant it is an unlikely candidate for life as we know it.
How far away is TOI-2202 b?
TOI-2202 b is about 770 light-years from Earth in the constellation Hydrus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 13,543,200 years to get there.
How big is TOI-2202 b compared to Earth?
TOI-2202 b has 10.95 times the radius of Earth and about 287 times its mass.
How long is a year on TOI-2202 b?
One orbit around TOI-2202 takes 11.9 Earth days — short enough that 31 of its years would fit into one Earth year.
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