The TOI-1803 System
TOI-1803 is a planetary system in the constellation Ursa Major hosting 2 confirmed exoplanets, about 389 light-years from Earth.
Size Comparison: The Planets of TOI-1803
TOI-1803: Star and Habitable Zone
TOI-1803
- Surface temperature
- 4,687 K (Sun: 5,772 K)
- Mass
- 0.76 M☉
- Radius
- 0.72 R☉
- Luminosity
- 0.2220 L☉
- Age
- 1.4 billion years (Sun: 4.6)
Habitable zone of TOI-1803: 0.374–0.917 AU (conservative: 0.474–0.869 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 2 Planets in the TOI-1803 System
| Planet | Type | Orbit | Radius | ESI | Discovered |
|---|---|---|---|---|---|
| TOI-1803 b | Mini Neptune | 6.3 d | 2.99 R⊕ | — | 2025 |
| TOI-1803 c | Neptune-like | 13 d | 4.29 R⊕ | — | 2025 |
Discovery History
The first planet found here, TOI-1803 b, was discovered in 2025 using the transit method.
- 2025 — TOI-1803 b (Transit)
- 2025 — TOI-1803 c (Transit)
Frequently Asked Questions About TOI-1803
How many planets does TOI-1803 have?
TOI-1803 has 2 confirmed exoplanets. More may await discovery.
Are any planets in the TOI-1803 system habitable?
None of the known planets in TOI-1803 orbit within the star's habitable zone.
How far away is TOI-1803?
TOI-1803 is about 389 light-years from Earth in the constellation Ursa Major.
Explore the TOI-1803 system in the app
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