HD 6434 b
| Exoplanet | List of exoplanets | |
|---|---|---|
| Parent star | ||
| Star | HD 6434 | |
| Constellation | Phoenix | |
| Right ascension | (α) | 01h 04m 40.1511s |
| Declination | (δ) | –39° 29′ 17.583″ |
| Distance | 131.5 ly (40.34 pc) | |
| Spectral type | G2/G3V | |
| Orbital elements | ||
| Semi-major axis | (a) | 0.14 AU |
| Periastron | (q) | 0.12 AU |
| Apastron | (Q) | 0.16 AU |
| Eccentricity | (e) | 0.17±0.03 |
| Orbital period | (P) | 21.998±0.009 d (0.060226 y) |
| Orbital speed | (υ) | 69 km/s |
| Argument of periastron |
(ω) | 156±11° |
| Time of periastron | (T0) | 2,451,490.8 ±0.6 JD |
| Semi-amplitude | (K) | 34.2±1.1 m/s |
| Physical characteristics | ||
| Mass | (m) | >0.39 MJ (>120 M⊕) |
| Discovery information | ||
| Discovery date | 7 August 2000 | |
| Discoverer(s) | Queloz et al. | |
| Discovery method | Doppler Spectroscopy | |
| Discovery site | California and Carnegie Planet Search | |
| Discovery status | Published | |
| Database references | ||
| Extrasolar Planets Encyclopaedia | data | |
| SIMBAD | data | |
| Exoplanet Archive | data | |
| Open Exoplanet Catalogue | data | |
HD 6434 b is an extrasolar planet orbiting the star HD 6434. It has a minimum mass about half that of Jupiter. It orbits the star very close, over 2.5 times as close as Mercury orbits the Sun. For this reason it completes one orbit in only 22 days. Unlike true "hot Jupiters" like 51 Pegasi b, HD 6434 b does not have a circular orbit, but rather an eccentric one.[1]
By studying observations taken by the Hipparcos astrometric mission, a group of scientists proposed that the planet has an inclination of 179.9° (almost exactly face-on) and a mass of 196 Jupiters. If that was the case, the planet would be a red dwarf instead. However, the data was anything but conclusive, and statistically it is extremely unlikely to lie in such a position. But because the inclination is unknown, so is the true mass of the planet. Still, it is very probable that the object is a true planet.
See also
References
- ↑ Mayor, M.; et al. (2004). "The CORALIE survey for southern extra-solar planets XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE". Astronomy and Astrophysics. 415 (1): 391–402. arXiv:astro-ph/0310316
. Bibcode:2004A&A...415..391M. doi:10.1051/0004-6361:20034250.
- "European Southern Observatory: Six Extrasolar Planets Discovered". SpaceRef Interactive Inc. 7 August 2000. Retrieved 15 August 2009.
External links
- "HD 6434". Exoplanets.
Coordinates: 
01h 04m 40.1511s, −39° 29′ 17.583″