The HD 118203 System
HD 118203 is a planetary system in the constellation Ursa Major hosting 2 confirmed exoplanets, about 301 light-years from Earth.
Size Comparison: The Planets of HD 118203
Planets without a measured radius are not shown.
HD 118203: Star and Habitable Zone
HD 118203
- Surface temperature
- 5,742 K (Sun: 5,772 K)
- Mass
- 1.27 M☉
- Radius
- 2.04 R☉
- Age
- 4.7 billion years (Sun: 4.6)
Habitable zone of HD 118203: 1.515–3.573 AU (conservative: 1.919–3.388 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 HD 118203 System
| Planet | Type | Orbit | Radius | ESI | Discovered |
|---|---|---|---|---|---|
| HD 118203 b | Hot Jupiter | 6.1 d | 12.78 R⊕ | 0.07 | 2005 |
| HD 118203 c | Cold Gas Giant | 5,103 d | — | — | 2024 |
Discovery History
The first planet found here, HD 118203 b, was discovered in 2005 using the radial velocity method. The most recent addition, HD 118203 c, followed in 2024.
- 2005 — HD 118203 b (Radial Velocity)
- 2024 — HD 118203 c (Radial Velocity)
Frequently Asked Questions About HD 118203
How many planets does HD 118203 have?
HD 118203 has 2 confirmed exoplanets. More may await discovery.
Are any planets in the HD 118203 system habitable?
None of the known planets in HD 118203 orbit within the star's habitable zone.
How far away is HD 118203?
HD 118203 is about 301 light-years from Earth in the constellation Ursa Major.
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