HD 128311 b

HD 128311 b

Exoplanet		List of exoplanets
Parent star
Star		HD 128311
Constellation		Boötes
Right ascension	(α)	14^h 36^m 00.5607^s
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
Semi-major 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		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

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

• "Notes for planet HD 128311 b". The Extrasolar Planets Encyclopaedia. Retrieved 2008-08-18.
• "HD 128311". Exoplanets. Retrieved 2008-08-18.

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