HD 75289 b

HD 75289 b

Discovery
Discovered by	Udry et al.
Discovery date	February 1, 1999
Detection method	Radial velocity
Orbital characteristics
Semi-major axis	0.0482 ± 0.0028 AU
Eccentricity	0.034 ± 0.029
Orbital period (sidereal)	3.509267 ± 0.000064 d
Longitude of perihelion	141°
Time of perihelion	2,450,830.34 ± 0.48 JD
Semi-amplitude	54.9 ± 1.8 m/s
Physical characteristics
Mass	>0.467 ± 0.041 MJ

HD 75289 b is an extrasolar planet orbiting the star HD 75289 in Vela constellation. It has a minimum mass half that of Jupiter, and it orbits in a very short orbit completing one circular revolution around the star in three and a half days. By studying the starlight scientists have concluded that the planet must have an albedo less than 0.12, rather low for a gas giant. Otherwise its reflected light would have been detected.

This planet was discovered by the Geneva Extrasolar Planet Search team using Doppler spectroscopy.

See also

• List of exoplanets discovered before 2000

External links

• The Extrasolar Planets Encyclopaedia entry