HD 219134 b

HD 219134 b
	An artist's impression of the hot rocky exoplanet HD 219134 b.
Discovery
Discovery site	HARPS-N of the Telescopio Nazionale Galileo
Discovery date	30 July 2015
Detection method	radial velocity method (HARPS-N)
Orbital characteristics
Semi-major axis	0.038764 (± 0.0047) AU
Eccentricity	0 (fixed)
Orbital period (sidereal)	3.092926 (± 0.0004) d
Inclination	85.058 ± 0.08
Star	HD 219134
Physical characteristics
Mean radius	1.602±0.055 R🜨
Mass	4.74 (± 0.19) ME
Mean density	6.36 (± 0.72) g cm−3
Surface gravity	1.847 +0.213; −0.19 g
Temperature	1,015 K (742 °C; 1,367 °F)

HD 219134 b (or HR 8832 b) is one of at least five exoplanets orbiting HD 219134, a main-sequence star in the constellation of Cassiopeia.^[3]^[1]^[4]^[5] HD 219134 b has a size of about 1.6 R_🜨, and a density of 6.4 g/cm³ and orbits at 21.25 light-years away.^[3] 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.^[3]^[4] The exoplanet has a mass of about 4.5 times that of Earth and orbits its host star every three days.^[3] In 2017, it was found that the planet likely hosts an atmosphere.

^ ^a ^b ^c ^d ^e ^f ^g Motalebi, F.; et al. (2015). "The HARPS-N Rocky Planet Search, I. HD 219134b: A transiting rocky planet in a multi-planet system at 6.5 pc from the Sun" (PDF). Astronomy & Astrophysics. 584: A72. arXiv:1507.08532. Bibcode:2015A&A...584A..72M. doi:10.1051/0004-6361/201526822. S2CID 45652878.
^ Cite error: The named reference Gillon2017 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference NASA-20150730-fc was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference NASA-20150730 was invoked but never defined (see the help page).
^ "HD 219134". exoplanetarchive.ipac.caltech.edu.

[harps39-1] ^ ^a ^b ^c ^d ^e ^f ^g Motalebi, F.; et al. (2015). "The HARPS-N Rocky Planet Search, I. HD 219134b: A transiting rocky planet in a multi-planet system at 6.5 pc from the Sun" (PDF). Astronomy & Astrophysics. 584: A72. arXiv:1507.08532. Bibcode:2015A&A...584A..72M. doi:10.1051/0004-6361/201526822. S2CID 45652878.

[Gillon2017-2] Cite error: The named reference Gillon2017 was invoked but never defined (see the help page).

[NASA-20150730-fc-3] Cite error: The named reference NASA-20150730-fc was invoked but never defined (see the help page).

[NASA-20150730-4] Cite error: The named reference NASA-20150730 was invoked but never defined (see the help page).

[5] "HD 219134". exoplanetarchive.ipac.caltech.edu.

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