HD 219828 b

HD 219828 b
Exoplanet List of exoplanets
Parent star
Star HD 219828
Constellation Pegasus
Right ascension (α) 23h 18m 46.7353s
Declination (δ) +18° 38 44.590
Distance264.5 ly
(81.1 pc)
Spectral type G0IV
Orbital elements
Semi-major axis(a) 0.052 AU
Periastron (q) 0.051 AU
Apastron (Q) 0.053 AU
Eccentricity (e) 0.021
Orbital period(P) 3.8335 ± 0.0013 d
Argument of
periastron
(ω) 0°
Time of periastron (T0) 2,453,898.6289 ± 0.072 JD
Semi-amplitude (K) 7 ± 50 m/s
Physical characteristics
Mass(m)>0.066 MJ
(>21 M)
Discovery information
Discovery date Feb 18, 2007
Discoverer(s) Melo et al.
Discovery method radial velocity
Discovery site  Chile
Discovery status Published

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.

External links

Coordinates: 23h 18m 46.7353s, +18° 38′ 44.590″


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