HD 219828 b
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.[1]
| Discovery | |
|---|---|
| Discovered by | Melo et al. |
| Discovery site |  |
| Discovery date | Feb 18, 2007 |
| radial velocity | |
| Orbital characteristics | |
| 0.052 AU (7,800,000 km) | |
| Eccentricity | 0.021 |
| 3.8335 ± 0.0013 d | |
| 2,453,898.6289 ± 0.072 | |
| 0 | |
| Semi-amplitude | 7 ± 50 |
| Star | HD 219828 |
References
- Melo, C.; et al. (2007). "A new Neptune-mass planet orbiting HD 219828". Astronomy and Astrophysics. 467 (2): 721–727. arXiv:astro-ph/0702459. Bibcode:2007A&A...467..721M. doi:10.1051/0004-6361:20066845.
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