HD 217107 c
Description: HD 217107 c is an extrasolar planet approximately 64 light-years away from Earth in the constellation of Pisces. The planet was the second planet to be discovered orbiting the star HD 217107. HD 217107 c's existence was hypothesized in 1998 due to the eccentricity of the inner planet's orbit and confirmed in 2005 when radial velocity studies of the star indicated another, more distant and massive companion orbiting the star. The planet has an eccentric orbit lasting on order of a decade.
Physical Properties
Mass (Jupiter mass): Unknown
Radius (Jupiter radius): 1.18 RJ
Density: 1.97 g/cm³
Equilibrium Temperature: Unknown
Orbital Parameters
Orbital Period: 4270.0 days
Semi-major Axis: 5.32 AU
Eccentricity: 0.517
Inclination: Unknown
Host Star Properties
Host Star: HD 217107
Spectral Type: G8 IV
Temperature: 5575.0 K
Stellar Mass: 0.98 M☉
Stellar Radius: 1.2 R☉
Discovery Information
Planet Letter: c
Object ID: 3.11234
Host ID: 2.60825
Discovery Date: 2005-10
Discovery Year: 2005
Discovery Method: Radial Velocity
Discovery Locale: Ground
Discovery Facility: Lick Observatory
Discovery Instrument: Hamilton Echelle Spectrograph