TOI-1203 c
TOI-1203 c is a super-Earth orbiting the G3 V star TOI-1203 in the constellation Hydra. It lies about 212 light-years from Earth and was discovered in 2025 using the radial velocity method.
Is TOI-1203 c in the Habitable Zone?
The position of TOI-1203 c relative to the habitable zone of TOI-1203 cannot be precisely determined from the available orbital data.
Habitable zone of TOI-1203: 0.874–2.062 AU (conservative: 1.108–1.955 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-1203 c — one full orbit around TOI-1203 — lasts 13.1 Earth days, shorter than Mercury's 88-day year. Its orbit is mildly elliptical (eccentricity 0.09).
How Was TOI-1203 c Discovered?
TOI-1203 c was discovered in 2025 using the radial velocity method, with observations from La Silla Observatory.
The radial velocity method measures the subtle wobble of a star caused by the gravitational pull of an orbiting planet, visible as periodic shifts in the star's light spectrum. The size of the wobble reveals the planet's minimum mass.
How Far Away Is TOI-1203 c?
TOI-1203 c is 212.0 light-years (65.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 1814. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 3,731,200 years to make the journey.
The Host Star: TOI-1203
TOI-1203
- Spectral type
- G3 V
- Surface temperature
- 5,737 K (Sun: 5,772 K)
- Mass
- 0.89 M☉
- Radius
- 1.18 R☉
- Age
- 12.5 billion years (Sun: 4.6)
The TOI-1203 Planetary System
TOI-1203 c is one of 4 known planets in the TOI-1203 system. Its siblings:
- TOI-1203 b (Super Earth)
- TOI-1203 e (Neptune-like)
- TOI-1203.01 (Mini Neptune)
TOI-1203 c — Complete Data
| Mass (best estimate) | 5.46 Earth masses |
|---|---|
| Orbital period | 13.08 days |
| Eccentricity | 0.092 |
| Distance from Earth | 212.0 light-years (65.0 parsecs) |
| Constellation | Hydra |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-10-02. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About TOI-1203 c
Is TOI-1203 c habitable?
TOI-1203 c is not known to orbit within the habitable zone of TOI-1203, and as a super-Earth it is an unlikely candidate for life as we know it.
How far away is TOI-1203 c?
TOI-1203 c is about 212 light-years from Earth in the constellation Hydra. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 3,731,200 years to get there.
How long is a year on TOI-1203 c?
One orbit around TOI-1203 takes 13.1 Earth days — short enough that 28 of its years would fit into one Earth year.
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