TOI-2202 c
TOI-2202 c 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 timing variations method.
Is TOI-2202 c in the Habitable Zone?
TOI-2202 c orbits inside the inner edge of the habitable zone of TOI-2202. So close to its star, surface conditions are far too hot for liquid water.
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 c — one full orbit around TOI-2202 — lasts 24.7 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.155 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.06).
How Was TOI-2202 c Discovered?
TOI-2202 c was discovered in 2021 using the transit timing variations method, with observations from Multiple Observatories.
Transit timing variations reveal a planet through its gravitational tug on a sibling planet, which makes that sibling's transits arrive slightly early or late. The pattern of these deviations betrays the hidden planet's mass and orbit.
How Far Away Is TOI-2202 c?
TOI-2202 c 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 c scores 0.13, ranking #4,303 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 c is one of 2 known planets in the TOI-2202 system. Its siblings:
- TOI-2202 b (Cold Gas Giant)
TOI-2202 c — Complete Data
| Mass | 117.28 Earth masses (0.369 Jupiter masses) |
|---|---|
| Orbital period | 24.67 days |
| Orbital distance | 0.155 AU |
| Eccentricity | 0.062 |
| Earth Similarity Index | 0.13 |
| Distance from Earth | 769.5 light-years (235.9 parsecs) |
| Constellation | Hydrus |
| Discovery method | Transit Timing Variations |
| Discovery facility | Multiple Observatories |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2021-08-23. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-2202 c
Is TOI-2202 c habitable?
No — TOI-2202 c orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is TOI-2202 c?
TOI-2202 c 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 long is a year on TOI-2202 c?
One orbit around TOI-2202 takes 24.7 Earth days — short enough that 15 of its years would fit into one Earth year.
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