HD 128311 b

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HD 128311 b
Extrasolar planet List of extrasolar planets
Parent star
Star HD 128311
Constellation Boötes
Right ascension (α) 14h 36m 00.5607s
Declination (δ) +09° 44′ 47.466″
Distance 54.14 ly
(18.04 pc)
Spectral type K0V
Mass (m) 0.8 M
Radius (r) 0.73 R
Temperature (T) 4965 K
Metallicity [Fe/H] 0.03
Age 0.39 Gyr
Orbital elements
Semimajor axis (a) 1.100 ± 0.065 AU
Periastron (q) 0.820 AU
Apastron (Q) 1.380 AU
Eccentricity (e) 0.25 ± 0.10
Orbital period (P) 458.6 ± 6.8 d
(1.256 y)
Orbital speed (υ) 26.2 km/s
Argument of
periastron
(ω) 111° ± 36°°
Time of periastron (T0) 2,450,211 ± 76 JD
Semi-amplitude (K) 66.8 ± 8.7 m/s
Physical characteristics
Minimum mass (m sin i) 2.19 ± 0.20 MJ
(696 ± 64 M)
Discovery information
Discovery date 2002
Discoverer(s) Butler et al.
Discovery method Doppler Spectroscopy
Discovery site United States California, USA
Discovery status Published
Database references
Extrasolar Planets
Encyclopaedia
data
SIMBAD data
Exoplanet Archive data
Open Exoplanet Catalogue data

HD 128311 b is an exoplanet[1] located approximately 54 light-years away in the constellation of Boötes. This planet orbits in an eccentric orbit about 1.1 AU from its star (HD 128311). The planet has minimum mass 2.19 Jupiter masses.[2]

References[edit]

  1. ^ Butler, R. Paul et al. (2003). "Seven New Keck Planets Orbiting G and K Dwarfs". The Astrophysical Journal 582 (1): 455–466. Bibcode:2003ApJ...582..455B. doi:10.1086/344570. 
  2. ^ Vogt, Steven S. et al. (2005). "Five New Multicomponent Planetary Systems". The Astrophysical Journal 632 (1): 638–658. Bibcode:2005ApJ...632..638V. doi:10.1086/432901. 

External links[edit]

Coordinates: Sky map 14h 36m 00.5607s, +09° 44′ 47.466″