HD 189733 b
Description: HD 189733 b is an exoplanet in the constellation of Vulpecula approximately 64.5 light-years away from the Solar System. Astronomers in France discovered the planet orbiting the star HD 189733 on October 5, 2005, by observing its transit across the star's face. With a mass 11.2% higher than that of Jupiter and a radius 11.4% greater, HD 189733 b orbits its host star once every 2.2 days at an orbital speed of 152.0 kilometers per second, making it a hot Jupiter with poor prospects for extraterrestrial life.
Physical Properties
Mass (Jupiter mass): 1.13 MJ
Radius (Jupiter radius): 1.13 RJ
Density: 0.943 g/cm³
Equilibrium Temperature: 1209.0 K
Orbital Parameters
Orbital Period: 2.21857567 days
Semi-major Axis: 0.03126 AU
Eccentricity: Unknown
Inclination: 85.71°
Host Star Properties
Host Star: HD 189733
Spectral Type: K2 V
Temperature: 5052.0 K
Stellar Mass: 0.83 M☉
Stellar Radius: 0.75 R☉
Discovery Information
Planet Letter: b
Object ID: 3.11185
Host ID: 2.58705
Discovery Date: 2005-12
Discovery Year: 2005
Discovery Method: Radial Velocity
Discovery Locale: Ground
Discovery Facility: Haute-Provence Observatory
Discovery Instrument: ELODIE Spectrograph