| HD 4203 b | |
| Discoverer: | Vogt et al. |
| Discovery Site: | Keck telescope |
| Discovered: | 15 October 2001 |
| Apsis: | astron |
| Aphelion: | 3.14AU |
| Perihelion: | 0.996AU |
| Semimajor: | 2.07± |
| Eccentricity: | 0.519 ± 0.027 |
| Period: | 431.88 ± 0.85 d 1.1824 y |
| Time Periastron: | 2,451,918.9 ± 2.7 |
| Arg Peri: | 329.1 ± 3.1 |
| Semi-Amplitude: | 60.3 ± 2.2 |
| Mass: | >1.16 (>369) |
HD 4203 b is an exoplanet more massive than Jupiter. It orbits two times further from the star than Earth to the Sun. The planet takes 1.1824 year to orbit the star very eccentrically from 1.00 AU to 3.14 AU. The planet was discovered by Steve Vogt using the Keck telescope.