HD 171238 b

HD 171238 b
Exoplanet List of exoplanets
Parent star
Star HD 171238
Constellation Sagittarius
Right ascension (α) 18h 34m 43.6733s
Declination (δ) –28° 04′ 20.328″
Apparent magnitude (mV) 8.66
Distance163.99±9.49 ly
(50.28±2.91 pc)
Spectral type G8V
Orbital elements
Semi-major axis(a) 2.54±0.06 AU
Periastron (q) 1.52 AU
Apastron (Q) 3.56 AU
Eccentricity (e) 0.4+0.061
−0.065
Orbital period(P) 1523+40
−45 d
(4.17+0.11
−0.12 y)
Argument of
periastron		 (ω) 47+9.9
−9.8°
Time of periastron (T0) 5062±20 JD
Physical characteristics
Minimum mass(m sin i)2.6±0.15 MJ
Discovery information
Discovery date August 11, 2009
Discoverer(s) Segransan et al.
Discovery method Radial velocity (CORALIE)
Discovery site La Silla Observatory
Discovery status Published
Other designations
HIP 91085 b
Database references
Extrasolar Planets
Encyclopaedia		data
SIMBADdata
Exoplanet Archivedata
Open Exoplanet Cataloguedata

HD 171238 b is an extrasolar planet which orbits the G-type main sequence star HD 171238, located approximately 164 light years away in the constellation Sagittarius. This planet has minimum mass two and a half times greater than Jupiter and orbits two times closer to the star than Jupiter to the Sun. However this planet orbits in an eccentric orbit, about two astronomical units difference between periastron and apastron distances. This planet was discovered in August 2009 by using the radial velocity method in La Silla Observatory, Chile.

References

  • Segransan; et al. (2009). "The CORALIE survey for southern extrasolar planets. XVI. Discovery of a planetary system around HD 147018 and of two long period and massive planets orbiting HD 171238 and HD 204313". Astronomy & Astrophysics. 511: A45. arXiv:0908.1479. Bibcode:2010A&A...511A..45S. doi:10.1051/0004-6361/200912136.

Coordinates: 18h 34m 43.6733s, −28° 04′ 20.328″


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