Astronomy:HD 219134 e

HD 219134 e

Discovery
Discovery site	HARPS-N of the Telescopio Nazionale Galileo
Discovery date	2015 July 30
Detection method	radial velocity method (HARPS-N);
Orbital characteristics
Semi-major axis	2.14+0.43 −0.02 AU
Eccentricity	0.27±0.11
Orbital period	1190+379 −34 d
Inclination	null
Star	HR 8832
Physical characteristics
Mass	62±6 M⊕

HD 219134 e, also known as HR 8832 e, is an exoplanet orbiting around the K-type star HR 8832 in the constellation of Cassiopeia. It has a mass of 62 Earth Masses, which indicates that the planet is likely a gas giant. The exoplanet was initially detected by the instrument HARPS-N of the Italian Telescopio Nazionale Galileo via the radial velocity method. Unlike HD 219134 b it has not been observed by the Spitzer telescope and thus its radius and density are unknown. It is in the ammonia habitable zone, so if it has a large moon with an atmosphere, liquid ammonia could flow on the moon's surface.

Star HR 8832 (circled) lies just off the "W" shape of the constellation Cassiopeia.