| Discovery | |
|---|---|
| Discovered by | Segransan et al. |
| Discovery site | La Silla Observatory |
| Discovery date | August 11, 2009 |
| Detection method | Radial velocity (CORALIE) |
| Orbital characteristics | |
| Semi-major axis | 2.518+0.032 −0.033 AU |
| Eccentricity | 0.234±0.028 |
| Orbital period (sidereal) | 4.148+0.045 −0.046 yr |
| Inclination | 19.1+7.9 −8.5 or 162.9+5.0 −3.1 |
| Longitude of ascending node | 71+47 −13 |
| Time of periastron | 2455905±20 |
| Argument of periastron | 46.9+3.9 −3.7 |
| Semi-amplitude | 50.7±2.6 |
| Star | HD 171238 |
| Physical characteristics | |
| Mass | 8.8+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.
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.
References
- ^ Li, Yiting; Brandt, Timothy D.; Brandt, G. Mirek; Dupuy, Trent J.; Michalik, Daniel; Jensen-Clem, Rebecca; Zeng, Yunlin; Faherty, Jacqueline; Mitra, Elena L. (2021). "Precise Masses and Orbits for Nine Radial-velocity Exoplanets". The Astronomical Journal. 162 (6): 266. arXiv:2109.10422. Bibcode:2021AJ....162..266L. doi:10.3847/1538-3881/ac27ab. S2CID 237592581.
- Ment, Kristo; et al. (2018). "Radial Velocities from the N2K Project: Six New Cold Gas Giant Planets Orbiting HD 55696, HD 98736, HD 148164, HD 203473, and HD 211810". The Astronomical Journal. 156 (5). 213. arXiv:1809.01228. Bibcode:2018AJ....156..213M. doi:10.3847/1538-3881/aae1f5. S2CID 119243619.
- Ségransan, D.; et al. (2010). "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 and Astrophysics. 511. A45. arXiv:0908.1479. Bibcode:2010A&A...511A..45S. doi:10.1051/0004-6361/200912136. S2CID 8864844.
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