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HD 219828 b

Coordinates: Sky map 23h 18m 46.7353s, +18° 38′ 44.590″
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HD 219828 b
Discovery
Discovered byMelo et al.
Discovery site Chile
Discovery dateFeb 18, 2007
radial velocity
Orbital characteristics
0.052 AU (7,800,000 km)
Eccentricity0.021
3.8335 ± 0.0013 d
2,453,898.6289 ± 0.072
0
Semi-amplitude7 ± 50
StarHD 219828

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]

References

  1. ^ 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. S2CID 13524822.


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