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HD 171238

Coordinates: Sky map 18h 34m 43.6733s, −28° 04′ 20.328″
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HD 171238
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagittarius
Right ascension 18h 34m 43.676s[1]
Declination −28° 04′ 20.33″[1]
Apparent magnitude (V) 8.606[2]
Characteristics
Evolutionary stage Main sequence
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)21.11±0.17[6] km/s
Proper motion (μ) RA: −29.539 mas/yr[1]
Dec.: −109.580 mas/yr[1]
Parallax (π)22.4809 ± 0.0324 mas[1]
Distance145.1 ± 0.2 ly
(44.48 ± 0.06 pc)
Absolute magnitude (MV)5.15[5]
Details
Mass0.99±0.01[7] M
Radius0.95±0.01[7] R
Luminosity0.774±0.003[7] L
Surface gravity (log g)4.47±0.01[7] cgs
Temperature5,570±21[7] K
Metallicity [Fe/H]0.17±0.007[5] dex
Rotational velocity (v sin i)1.48[5] km/s
Age4.0±1.2[7] Gyr
Other designations
CD–28°14719, HD 171238, HIP 91085, SAO 186998, PPM 268605[8]
Database references
SIMBADdata
Exoplanet Archivedata

HD 171238 is a star with an orbiting exoplanet in the southern constellation of Sagittarius. It is located at a distance of 145 light years from the Sun based on parallax measurements, and is drifting further away with a radial velocity of 21 km/s.[6] The star has an absolute magnitude of 5.15,[5] but at the distance of this system it is too faint to be viewed with the naked eye, having an apparent visual magnitude of 8.61.[2]

The spectrum of HD 171238 presents as an ordinary G-type main-sequence star with a stellar classification of G8 V.[3] At an estimated age of around four billion years,[7] it is spinning with a projected rotational velocity of 1.5 km/s.[5] The metallicity of the star – the abundance of elements more massive than helium – is 48% higher than solar, based on the abundance of iron.[5] There are indications of a significant level of magnetic activity in the chromosphere.[5] The star has 99% of the mass of the Sun and 95% of the Sun's girth. It is radiating just 77% of the luminosity of the Sun from its photosphere at an effective temperature of 5,570 K.[7]

Planetary system

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In August 2009, it was announced that this star has a super-jovian exoplanet.[5] Using astrometry from Gaia, astronomers were able to deduce the true mass of HD 171238 b as 8.8 MJ; higher than the minimum mass estimated from Doppler spectroscopy.[9]

The HD 171238 planetary system[9]
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

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References

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  1. ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b 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.
  3. ^ a b 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.
  4. ^ a b c Cutri, R. M.; et al. (June 2003), 2MASS All Sky Catalog of point sources, NASA/IPAC, Bibcode:2003tmc..book.....C
  5. ^ a b c d e f g h i 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.
  6. ^ a b Soubiran, C.; et al. (2018), "Gaia Data Release 2. The catalogue of radial velocity standard stars", Astronomy and Astrophysics, 616: A7, arXiv:1804.09370, Bibcode:2018A&A...616A...7S, doi:10.1051/0004-6361/201832795, S2CID 52952408.
  7. ^ a b c d e f g h Bonfanti, A.; et al. (2016), "Age consistency between exoplanet hosts and field stars", Astronomy & Astrophysics, 585: 14, arXiv:1511.01744, Bibcode:2016A&A...585A...5B, doi:10.1051/0004-6361/201527297, S2CID 53971692, A5.
  8. ^ "HD 171238". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-12-30.
  9. ^ a b Li, Yiting; et al. (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.