HD 219134 b
Description: HD 219134 b is one of at least five exoplanets orbiting HD 219134, a main-sequence star in the constellation of Cassiopeia. HD 219134 b has a size of about 1.5 R🜨, and a density of 6.4 g/cm3 and orbits at 21.25 light-years away. The exoplanet was initially detected by the instrument HARPS-N of the Italian Telescopio Nazionale Galileo via the radial velocity method and subsequently observed by the Spitzer telescope as transiting in front of its star. The exoplanet has a mass of about 4.5 times that of Earth and orbits its host star every three days. In 2017, it was found that the planet likely hosts an atmosphere.
Physical Properties
Mass (Jupiter mass): 0.014913633074285 MJ
Radius (Jupiter radius): 0.143 RJ
Density: 6.34 g/cm³
Equilibrium Temperature: 1015.0 K
Orbital Parameters
Orbital Period: 3.092926 days
Semi-major Axis: 0.03876 AU
Eccentricity: Unknown
Inclination: 85.05°
Host Star Properties
Host Star: HD 219134
Spectral Type: K3 V
Temperature: 4699.0 K
Stellar Mass: 0.81 M☉
Stellar Radius: 0.78 R☉
Discovery Information
Planet Letter: b
Object ID: 3.11795
Host ID: 2.61402
Discovery Date: 2015-12
Discovery Year: 2015
Discovery Method: Radial Velocity
Discovery Locale: Ground
Discovery Facility: Roque de los Muchachos Observatory
Discovery Instrument: HARPS-N Spectrograph