Astronomy:HD 219828 b
|Discovered by||Melo et al.|
|Discovery date||Feb 18, 2007|
|0.052 AU (7,800,000 km)|
|Orbital period||3.8335 ± 0.0013 d|
|Time of periastron||2,453,898.6289 ± 0.072|
|Semi-amplitude||7 ± 50|
HD 219828 b is an extrasolar planet approximately 265 light years away in the constellation of Pegasus. This is a Neptune-mass planet at least 21 times more massive than Earth. The planet's composition is unknown, but it may be similar to the ice giants Uranus and Neptune, or alternatively it may be a mainly rocky like Super-Earth.
- "HD 219828 b". The Extrasolar Planets Encyclopaedia. http://exoplanet.eu/planet.php?p1=HD+219828&p2=b.
Original source: https://en.wikipedia.org/wiki/ HD 219828 b. Read more