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HD 219134 b
Super-Earth orbiting HD 219134 / From Wikipedia, the free encyclopedia
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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.
![]() 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 |
radial velocity method (HARPS-N) | |
Orbital characteristics | |
0.038764 (± 0.0047)[1] AU | |
Eccentricity | 0 (fixed)[1] |
3.092926 (± 0.0004)[1] d | |
Inclination | 85.058 ± 0.08[1] |
Star | HD 219134 |
Physical characteristics | |
1.602±0.055[2] R🜨 | |
Mass | 4.74 (± 0.19)[1] ME |
Mean density | 6.36 (± 0.72)[1] g cm−3 |
1.847 +0.213 −0.19 g | |
Temperature | 1,015 K (742 °C; 1,367 °F) |