HD 108147 b

HD 108147 b

Exoplanet		List of exoplanets
Parent star
Star		HD 108147
Constellation		Crux
Right ascension	(α)	12h 25m 46.2686s
Declination	(δ)	–64° 01′ 19.516″
Distance		125.7 ly (38.57 pc)
Spectral type		F8/G0V
Orbital elements
Semi-major axis	(a)	0.104 AU
Periastron	(q)	0.052 AU
Apastron	(Q)	0.156 AU
Eccentricity	(e)	0.498 ± 0.025
Orbital period	(P)	10.901 ± 0.001 d (0.029845 y)
Orbital speed	(υ)	104 km/s
Argument of periastron	(ω)	318 ± 3.03°
Time of periastron	(T0)	2,451,591.6 ± 0.1 JD
Semi-amplitude	(K)	25.1 ± 6.1 m/s
Physical characteristics
Minimum mass	(m sin i)	0.40 MJ (127 M⊕)
Discovery information
Discovery date		April 15, 2000
Discoverer(s)		Pepe, Mayor, Galland et al.
Discovery method		Doppler spectroscopy (CORALIE)
Discovery site		La Silla Observatory, Chile
Discovery status		Published
Database references
Extrasolar Planets Encyclopaedia		data
SIMBAD		data
Exoplanet Archive		data
Open Exoplanet Catalogue		data

HD 108147 b is a gas giant exoplanet with a minimum mass about half that of Jupiter. It orbits the star in a very tight "torch orbit". The distance between the planet and the star is only a tenth of the distance between Earth and the Sun (0.1AU). A number of such worlds are known to exist, but the eccentricity of this planet is unusually high. Planets orbiting very close to their parent stars usually have round orbits because of the tidal forces between the bodies.

See also

• HD 107148 b