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HD 171238 is a 9th magnitude G-type main sequence star located approximately 146 light years away in the constellation Sagittarius. This star is a little bit cooler, less massive, older, and more metal-rich than the Sun,[5] although its age is poorly constrained.[6] In August 2009, it was announced that this star has a planet.[5]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 18h 34m 43.6760s[1] |
| Declination | −28° 04′ 20.3345″[1] |
| Apparent magnitude (V) | 8.606[2] |
| Characteristics | |
| Spectral type | G8 V[3] |
| Apparent magnitude (B) | 9.40 |
| Apparent magnitude (J) | 7.244[4] |
| Apparent magnitude (H) | 6.868[4] |
| Apparent magnitude (K) | 6.831[4] |
| B−V color index | 0.74[5] |
| Astrometry | |
| Radial velocity (Rv) | 21.1[2] km/s |
| Proper motion (μ) | RA: −29.578±0.105[1] mas/yr Dec.: −109.110±0.085[1] mas/yr |
| Parallax (π) | 22.2871 ± 0.0551 mas[1] |
| Distance | 146.3 ± 0.4 ly (44.9 ± 0.1 pc) |
| Absolute magnitude (MV) | 5.15[5] |
| Details | |
| Mass | 0.92±0.03[6] M☉ |
| Luminosity | 0.627±0.018[6] L☉ |
| Surface gravity (log g) | 4.43±0.04[5] cgs |
| Temperature | 5467±55[5] K |
| Metallicity [Fe/H] | 0.17±0.007[5] dex |
| Rotational velocity (v sin i) | 1.48[5] km/s |
| Age | 4.92±4.11[5] Gyr |
| Other designations | |
CD–28°14719, HD 171238, HIP 91085, PPM 268605, SAO 186998. | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
Using astrometry from Gaia, astronomers were able to deduce the true mass of HD 171238 b as 8.8 MJ, higher than its minimum mass from radial velocity.[6]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 8.8+3.6 −1.3 MJ |
2.518+0.032 −0.033 |
4.148+0.045 −0.046 |
0.358+0.028 −0.026 |
19.1+7.9 −8.5° |
— |
See also
References
- Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- Nordström, B.; et al. (May 2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ˜14 000 F and G dwarfs", Astronomy and Astrophysics, 418: 989–1019, arXiv:astro-ph/0405198, Bibcode:2004A&A...418..989N, doi:10.1051/0004-6361:20035959, S2CID 11027621
- Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H
- Cutri, R. M.; et al. (June 2003), 2MASS All Sky Catalog of point sources, NASA/IPAC, Bibcode:2003tmc..book.....C
- Ségransan, D.; 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. S2CID 8864844.
- 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.
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HD 171238 — звезда в созвездии Стрельца на расстоянии около 164 световых лет от нас. Вокруг звезды обращается, как минимум, одна планета.Текст в блоке "Читать" взят с сайта "Википедия" и доступен по лицензии Creative Commons Attribution-ShareAlike; в отдельных случаях могут действовать дополнительные условия.
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