HD 219134 b
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. 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. 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. The exoplanet has a mass of about 4.5 times that of Earth and orbits its host star every three days. 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 |
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) |
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