HD 83443 b is an extrasolar planet (exoplanet) that orbits the G-type main‑sequence star HD 83443, located in the constellation Hydra at an approximate distance of 119 light‑years from the Sun. The planet was detected using the radial‑velocity method and announced in 2000 as part of a series of discoveries made by the European Southern Observatory’s CORALIE spectrograph.
Discovery and observations
- Discovery team: M. Mayor, D. Queloz, and collaborators (CORALIE survey)
- Discovery date: 2000
- Detection method: Radial‑velocity (Doppler spectroscopy)
Orbital characteristics
- Orbital period: ~2.985 days (≈71.6 hours)
- Semi‑major axis: ~0.039 AU (approximately 5.8 million km)
- Eccentricity: Near‑circular; reported values are ≤0.01
Physical properties
- Minimum mass (M sin i): ≈0.35 MJup (≈110 M⊕)
- Classification: Hot Jupiter (gas giant in a very close orbit)
Host star – HD 83443
- Spectral type: G5V (G‑type dwarf)
- Apparent magnitude: V ≈ 8.0 (not visible to the naked eye)
- Mass: ~0.88 M☉
- Radius: ~0.88 R☉
Scientific significance
HD 83443 b was among the early exoplanets identified with orbital periods of only a few days, helping to establish the prevalence of short‑period gas giants—commonly termed “hot Jupiters”—in planetary systems. Its discovery contributed to the statistical understanding of planet frequency around Sun‑like stars and informed models of planetary migration.
Subsequent studies
Follow‑up observations have refined the orbital parameters and confirmed the planet’s existence. A second planet, HD 83443 c, was initially reported but later refuted by additional data, leaving HD 83443 b as the sole confirmed companion to the star.
References
- Mayor, M.; et al. (2000). “The CORALIE Survey for Southern Extrasolar Planets.” Astronomy & Astrophysics 356: 590–604.
- Santos, N. C.; et al. (2001). “Spectroscopic Confirmation of the Planetary Companion to HD 83443.” Astronomy & Astrophysics 376: 622–630.
All data are compiled from peer‑reviewed astronomical literature and recognized exoplanet databases as of the knowledge cut‑off date.
