The TOI-1203 System
TOI-1203 is a planetary system in the constellation Hydra hosting 4 confirmed exoplanets, about 212 light-years from Earth.
Size Comparison: The Planets of TOI-1203
Planets without a measured radius are not shown.
TOI-1203: Star and Habitable Zone
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)
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 ›
All 4 Planets in the TOI-1203 System
| Planet | Type | Orbit | Radius | ESI | Discovered |
|---|---|---|---|---|---|
| TOI-1203 b | Super Earth | 4.2 d | 1.52 R⊕ | — | 2025 |
| TOI-1203 c | Super Earth | 13 d | — | — | 2025 |
| TOI-1203.01 | Mini Neptune | 26 d | 2.92 R⊕ | — | 2021 |
| TOI-1203 e | Neptune-like | 205 d | — | — | 2025 |
Discovery History
The first planet found here, TOI-1203.01, was discovered in 2021 using the transit method. The most recent addition, TOI-1203 e, followed in 2025.
- 2021 — TOI-1203.01 (Transit)
- 2025 — TOI-1203 b (Radial Velocity)
- 2025 — TOI-1203 c (Radial Velocity)
- 2025 — TOI-1203 e (Radial Velocity)
Frequently Asked Questions About TOI-1203
How many planets does TOI-1203 have?
TOI-1203 has 4 confirmed exoplanets. More may await discovery.
Are any planets in the TOI-1203 system habitable?
None of the known planets in TOI-1203 orbit within the star's habitable zone.
How far away is TOI-1203?
TOI-1203 is about 212 light-years from Earth in the constellation Hydra.
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