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 |
| radial velocity method (HARPS-N) | |
| Orbital characteristics | |
| 0.038764±0.0047 AU | |
| Eccentricity | 0 (fixed) |
| 3.092926±0.0004 days | |
| Inclination | 85.058±0.080 |
| Star | HD 219134 |
| Physical characteristics | |
| 1.542±0.054 R🜨 | |
| Mass | 4.59±0.16 M🜨 |
Mean density | 6.36±0.72 g cm−3 |
| 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. HD 219134 b has a size of about 1.5 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.