HD 6434 b

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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
(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
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[citation needed] 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[citation needed]. 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.

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Coordinates: Sky map 01h 04m 40.1511s, −39° 29′ 17.583″