HD 219134 d

HD 219134 d

Exoplanet		List of exoplanets
Parent star
Star		HR 8832
Constellation		Cassiopeia
Right ascension	(α)	23^h 13^m 16.97632^s
Declination	(δ)	+57° 10′ 06.0823″
Apparent magnitude	(mV)	5.574
Distance		21.25 ly (6.52 pc)
Spectral type		K3 V
Temperature	(T)	4710 K
Observed separation
Orbital elements
Semi-major axis	(a)	0.234 ± 0.002[1] AU
Eccentricity	(e)	0.32 ± 0.14[1]
Orbital period	(P)	46.78 ± 0.16[1] d
Inclination	(i)	null[1]°
Physical characteristics
Mass	(m)	8.67 ± 1.14[1] M⊕
Discovery information
Discovery date		2015 July 30
Discoverer(s)
Discovery method		radial velocity method (HARPS-N);
Discovery site		HARPS-N of the Telescopio Nazionale Galileo
Discovery status		Published

HD 219134 d also known as HR 8832 d is an exoplanet orbiting around the K-type star HR 8832 in the constellation of Cassiopeia. It has a mass of 8.67 Earth Masses which means that this planet may be a Super-Earth if rocky, a Water world, or a Mini-Neptune if Gaseous. 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.

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

References

1. "HD 219134 d CONFIRMED PLANET OVERVIEW PAGE". NASA Exoplanet Archive. Retrieved 2015-10-08.