HD 212771 b
Extrasolar planet orbiting the star HD 212771 in the constellation Aquarius
From Wikipedia, the free encyclopedia
HD 212771 b is an extrasolar planet orbiting the G-type star HD 212771 approximately 364 light years away[3] in the constellation Aquarius.[1]
| Discovery[1] | |
|---|---|
| Discovered by | Johnson et al. |
| Discovery site | Keck Observatory |
| Discovery date | 2010-03-17 |
| Doppler spectroscopy | |
| Orbital characteristics[2] | |
| 1.19±0.13 AU | |
| Eccentricity | 0.076±0.051 |
| 380.7±1.4 d | |
| 2454920±52 JD | |
| 29±65 º | |
| Semi-amplitude | 50.0±5.8 m/s |
| Star | HD 212771 |
| Physical characteristics[2] | |
| Mass | ≥2.39±0.27 MJ |
Nomenclature
HD 212771 b is named Victoriapeak. The name was selected in the NameExoWorlds campaign by Hong Kong, during the 100th anniversary of the IAU. It is named after the Victoria Peak, the highest point on Hong Kong Island. The host star HD 212771 is named Lionrock, after the Lion Rock.[4][5]
Properties
Orbit
HD 212771 b's orbit period and distance are similar to Earth's, with the values being 380 days and 1.19 AU respectively. It orbits in a nearly perfect circular orbit compared to long period gas giants.
Characteristics
| Jupiter | HD 212771 / Victoriapeak |
|---|---|
 |
 |
Due to the unknown orbital parameters, the planets true mass is not known, with a minimum of 2.39 times Jupiter's mass. HD 212771 b's radius is unknown, so NASA's Eyes on Exoplanets gives an estimate of 1.18 times the radius.[6]
