HD 181720 b

HD 181720 b
Exoplanet List of exoplanets
Parent star
Star HD 181720
Constellation Sagittarius
Right ascension (α) 19h 22m 52.99s[1]
Declination (δ) –32° 55′ 08.6″[1]
Apparent magnitude (mV) 7.84[2]
Distance190 ± 10[1] ly
(58 ± 4[1] pc)
Spectral type G1V[2]
Orbital elements
Semi-major axis(a) 1.78[2] AU
(266 Gm)
    30.8 mas
Periastron (q) 1.31 AU
(196 Gm)
Apastron (Q) 2.24 AU
(335 Gm)
Eccentricity (e) 0.26 ± 0.06[2]
Orbital period(P) 956 ± 14[2] d
(2.62 y)
Orbital speed (υ) 20.3 km/s
Argument of
periastron		 (ω) 177 ± 12[2]°
Time of periastron (T0) 2,453,631 ± 30[2] JD
Semi-amplitude (K) 8.4 ± 0.4[2] m/s
Physical characteristics
Minimum mass(m sin i)0.37[2] MJ
Discovery information
Discovery date October 19, 2009
Discoverer(s) Santos et al.
Discovery method radial velocity (HARPS)
Discovery site La Silla Observatory
Discovery status Published[2]
Database references
Extrasolar Planets
Encyclopaedia		data
SIMBADdata
Exoplanet Archivedata
Open Exoplanet Cataloguedata

HD 181720 b is an extrasolar planet which orbits the G-type main sequence star HD 181720, located approximately 190 light years away in the constellation Sagittarius. This planet has at least three-eighths the mass of Jupiter and takes over two and five-eighths years to orbit the star at a semimajor axis of 1.78 AU with an eccentricity of 0.26.[2] This planet was detected by HARPS on October 19, 2009, together with 29 other planets.

See also

References

Coordinates: 19h 22m 52.9859s, −32° 55′ 08.595″


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