HD 156846 b

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HD 156846 b
Extrasolar planet List of extrasolar planets
Parent star
Star HD 156846
Constellation Ophiuchus
Right ascension (α) 17h 20m 34.3100s
Declination (δ) –19° 20′ 01.486″
Distance 160 ly
(49 pc)
Spectral type G0V
Orbital elements
Semimajor axis (a) 0.99 AU
(148 Gm)
Periastron (q) 0.15 AU
(22 Gm)
Apastron (Q) 1.83 AU
(274 Gm)
Eccentricity (e) 0.8472±0.0016
Orbital period (P) 359.51±0.09 d
(0.98427 y)
Orbital speed (υ) 30.1 km/s
Argument of
periastron
(ω) 52.23±0.41°
Time of periastron (T0) 2453998.09±0.05 JD
Semi-amplitude (K) 123.9 m/s
Physical characteristics
Minimum mass (m sin i) 10.45±0.05 MJ
Discovery information
Discovery date Oct 26, 2007
Discoverer(s) Tamuz et al.
Discovery method radial velocity
Discovery site La Silla Observatory
Discovery status Published
Other designations
HIP 84856 b, HR 6441 b

HD 156846 b is an extrasolar planet located approximately 160 light-years away in the constellation of Ophiuchus, orbiting the star HD 156846. It has one of the most eccentric planetary orbits known. The high eccentricity of this planet's orbit is probably attributable to the presence of a red dwarf companion star. The average distance of the planet from HD 156846 is 0.99 AU, nearly identical to the distance of Earth from the Sun. The distance ranges from 0.15 AU to 1.83 AU with a 360 day period. It is also very massive with at least 10.45 Jupiter masses. The mass is a lower limit because the inclination of the orbit is not known; if its inclination and hence true mass became known, it would probably be found to be a brown dwarf.[1]

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Coordinates: Sky map 17h 20m 34.3100s, −19° 20′ 01.486″