HD 171238 b

HD 171238 b
Discovery
Discovered bySegransan et al.
Discovery siteLa Silla Observatory
Discovery dateAugust 11, 2009
Radial velocity (CORALIE)
Orbital characteristics[1]
2.518+0.032
−0.033 AU
Eccentricity0.234±0.028
4.148+0.045
−0.046 yr
Inclination19.1+7.9
−8.5 or 162.9+5.0
−3.1
71+47
−13
2455905±20
46.9+3.9
−3.7
Semi-amplitude50.7±2.6[2]
StarHD 171238
Physical characteristics[1]
Mass8.8+3.6
−1.3 MJ

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.[3]

Astrometry of HD 171238 has determined an orbital inclination of either 19.1° or 162.9°, depending on whether the solution is prograde or retrograde. This, combined with the minimum mass, gives a true mass of 8.8 MJ.[1]

  1. ^ a b c Cite error: The named reference Li2021 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Ment2018 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Ségransan2010 was invoked but never defined (see the help page).