HD 185269 b

HD 185269 b

Exoplanet		List of exoplanets
Parent star
Star		HD 185269
Constellation		Cygnus
Right ascension	(α)	19h 37m 11.7408s
Declination	(δ)	+28° 29′ 59.509″
Apparent magnitude	(mV)	6.67
Distance		153.3 ± 3.3 ly (47 ± 1 pc)
Spectral type		G0IV
Orbital elements
Semi-major axis	(a)	0.077 AU
Periastron	(q)	0.054 AU
Apastron	(Q)	0.100 AU
Eccentricity	(e)	0.3 ± 0.04
Orbital period	(P)	6.838 ± 0.001 d
Orbital speed	(υ)	119 km/s
Argument of periastron	(ω)	173 ± 6.8°
Time of periastron	(T0)	2,453,154.1 ± 0.18 JD
Semi-amplitude	(K)	86 ± 4.4 m/s
Physical characteristics
Minimum mass	(m sin i)	0.94 MJ
Discovery information
Discovery date		August 18, 2006
Discoverer(s)		Moutou and Johnson et al.
Discovery method		radial velocity
Discovery site		Observatoire de Haute Provence, Lick Observatory
Discovery status		Published
Database references
Extrasolar Planets Encyclopaedia		data
SIMBAD		data
Exoplanet Archive		data
Open Exoplanet Catalogue		data

HD 185269 b is a hot Jupiter extrasolar planet approximately 153 light years away in the constellation of Cygnus. The minimum mass is slightly less than Jupiter and the orbital period is about one week. Most hot Jupiters are thought to have undergone tidal circularization, making the eccentricity of HD 185269 b (e=0.3) unusual. Despite having a large transit probability, none have yet been detected by various photometric monitoring campaigns.

The planet was discovered nearly simultaneously by Johnson et al. as part of a search for planets around subgiants, and by Moutou et al. as part of a search for planets around metal-rich stars (the submission dates to the journals ApJ and Astronomy and Astrophysics were separated by only 9 days).