HD 219134 g
HD 219134 g, also known as HR 8832 g, is an unconfirmed exoplanet orbiting around the K-type star HD 219134 in the constellation of Cassiopeia. It has a minimum mass of 11 or 15 Earth masses, suggesting that it is likely a Neptune-like ice giant. Unlike HD 219134 b and HD 219134 c it is not observed to transit and thus its radius and density are unknown. If it has an Earth-like composition, it would have a radius 1.9 times that of Earth. However, since it is probably a Neptune-like planet, it is likely larger.
| Discovery | |
|---|---|
| Discovered by | HARPS-N |
| Discovery site | La Palma, Canary Islands |
| Discovery date | 2015 November 17 |
Detection method | radial velocity method |
| Orbital characteristics | |
Semi-major axis | 0.3753±0.0004 AU, 0.603±0.001 |
| Eccentricity | 0, 0.16±0.1 |
Orbital period (sidereal) | 94.2±0.2 d, 192.0+0.5 −0.4 d |
| 0°, −0.4±0.6 rad | |
| Semi-amplitude | 1.8±0.2 m/s, 2.0±0.2 m/s |
| Star | HD 219134 |
| Physical characteristics | |
| Mass | ≥10.8±1.3 M🜨, ≥15.3±1.6 M🜨 |
| Temperature | 298 K (25 °C; 77 °F) |
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