HD 219134 d

HD 219134 d
Discovery
Discovery site	HARPS-N of the Telescopio Nazionale Galileo
Discovery date	2015 July 30
Detection method	radial velocity method (HARPS-N);
Orbital characteristics
Apastron	0.2697 (± 0.0059) AU
Periastron	0.2043 (± 0.0059) AU
Semi-major axis	0.2370 (± 0.003) AU
Eccentricity	0.138 (± 0.025)
Orbital period (sidereal)	46.8590 (± 0.028) d
Inclination	null
Star	HD 219134
Physical characteristics
Mean radius	>1.61 (± 0.02) R🜨
Mass	>16.17 (± 0.64) ME
Mean density	<21.4 g cm−3
Surface gravity	<6.24 g
Temperature	410.5 K (137.4 °C; 279.2 °F)

HD 219134 d, also known as HR 8832 d, is an exoplanet orbiting around the K-type star HD 219134 in the constellation of Cassiopeia. It has a minimum mass over 16 times that of Earth, indicating that it is likely a Hot Neptune. 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 and HD 219134 c it was not observed by the Spitzer Space Telescope and thus its radius and density are unknown. Only a minimum possible radius can be given.

^ ^a ^b ^c ^d ^e ^f "HD 219134 d CONFIRMED PLANET OVERVIEW PAGE". NASA Exoplanet Archive. Retrieved 2015-10-08.