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HD 169830 is a star in the southern constellation of Sagittarius. It has a yellow-white hue and is dimly visible to the naked eye with an apparent visual magnitude of +5.90.[2] The star is located at a distance of 120 light years from the Sun based on parallax. It is drifting closer with a radial velocity of −17.3 km/s,[4] and is predicted to come as close as 20.7 ly (6.4 pc) in 2.08 million years.[10] HD 169830 is known to be orbited by two large Jupiter-like exoplanets.

HD 169830
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Sagittarius
Right ascension 18h 27m 49.48500s[1]
Declination –29° 49′ 00.7008″[1]
Apparent magnitude (V) +5.90[2]
Characteristics
Spectral type F7V[3]
B−V color index 0.517±0.004[2]
Variable type “None”
Astrometry
Radial velocity (Rv)−17.271±0.0004[4] km/s
Proper motion (μ) RA: −0.341[1] mas/yr
Dec.: 16.103[1] mas/yr
Parallax (π)27.1461 ± 0.1469 mas[1]
Distance120.1 ± 0.7 ly
(36.8 ± 0.2 pc)
Absolute magnitude (MV)+3.08[2]
Details[5]
Mass1.4 M☉
Radius1.84 R☉
Luminosity4.63[6] L☉
Surface gravity (log g)4.06 cgs
Temperature6,300±50[6] K
Metallicity [Fe/H]0.15 dex
Rotation8.3 d[7]
Rotational velocity (v sin i)3.83 km/s
Age4.95[8] Gyr
Other designations
CD−29°14965, Gaia DR2 4048037707717866880, GC 25175, HD 169830, HIP 90485, HR 6907, SAO 186838, GSC 06869-01277, 2MASS J18274949-2949007[9]
Database references
SIMBADdata
ARICNSdata

This is an F-type main-sequence star[6] with a stellar classification of F7V.[3] It is 3.83[8] billion years old and chromospherically inactive[8] with a slow rotation rate,[8] having a projected rotational velocity of 3.83 km/s.[5] This star is 40% more massive and 84% larger than the Sun. Combining the mass and radius makes the surface gravity only 41% that of the Sun. It is radiating 4.6[6] times the luminosity of the Sun from its photosphere at an effective temperature of 6,300 K.[6]

A candidate stellar companion, designated component B, lies at an angular separation of 11″ along a position angle of 265°.[11]


Planetary system


On April 15, 2000, the Geneva Extrasolar Planet Search Team announced the discovery of a minimum mass 3 MJ planet in a 226-day orbit.[12][6] Three years later on June 30, 2003, the same team, using the same method, discovered a minimum mass 3.5 MJ second planet orbiting the star.[7] In 2022, the inclination and true mass of HD 169830 c were measured via astrometry.[13]

The HD 169830 planetary system[14][13]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b ≥2.956+0.070
−0.069 MJ		 0.8130+0.0083
−0.0084		 225.789+0.074
−0.081		 0.306+0.012
−0.013		 — —
c 7.669+1.937
−2.755 MJ		 3.075+0.132
−0.146		 1818.8+5.7
−6.4		 0.246+0.022
−0.018		 24.469+12.739
−7.205°		 —

See also



References


  1. Vallenari, A.; et al. (Gaia Collaboration) (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. arXiv:2208.00211. doi:10.1051/0004-6361/202243940. Gaia DR3 record for this source at VizieR.
  2. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  3. Gray, R. O.; et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. S2CID 119476992.
  4. 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.
  5. Fischer, Debra A.; Valenti, Jeff (2005). "The Planet‐Metallicity Correlation". The Astrophysical Journal. 622 (2): 1102. Bibcode:2005ApJ...622.1102F. doi:10.1086/428383.
  6. Naef, D.; et al. (2001). "The CORALIE survey for southern extrasolar planets V. 3 new extrasolar planets". Astronomy and Astrophysics. 375 (1): 205–218. arXiv:astro-ph/0106255. Bibcode:2001A&A...375..205N. doi:10.1051/0004-6361:20010841. S2CID 16606841.
  7. Mayor, M.; et al. (2004). "The CORALIE survey for southern extra-solar planets XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE". Astronomy and Astrophysics. 415 (1): 391–402. arXiv:astro-ph/0310316. Bibcode:2004A&A...415..391M. doi:10.1051/0004-6361:20034250. S2CID 5233877.
  8. Saffe, C.; et al. (2005). "On the Ages of Exoplanet Host Stars". Astronomy and Astrophysics. 443 (2): 609–626. arXiv:astro-ph/0510092. Bibcode:2005A&A...443..609S. doi:10.1051/0004-6361:20053452. S2CID 11616693.
  9. "HD 169830". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-03-16.
  10. Bailer-Jones, C.A.L.; Rybizki, J; Andrae, R.; Fouesnea, M. (2018). "New stellar encounters discovered in the second Gaia data release". Astronomy & Astrophysics. 616: A37. arXiv:1805.07581. Bibcode:2018A&A...616A..37B. doi:10.1051/0004-6361/201833456. S2CID 56269929.
  11. Raghavan, Deepak; et al. (2006). "Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems". The Astrophysical Journal. 646 (1): 523–542. arXiv:astro-ph/0603836. Bibcode:2006ApJ...646..523R. doi:10.1086/504823. S2CID 5669768.
  12. "Exoplanets Galore!" (Press release). Garching, Germany: European Southern Observatory. April 15, 2000. Retrieved December 30, 2012.
  13. Feng, Fabo; Butler, R. Paul; et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series. 262 (21). arXiv:2208.12720. Bibcode:2022arXiv220812720F. doi:10.3847/1538-4365/ac7e57.
  14. "HD 169830". NASA Exoplanet Archive. Retrieved 2 September 2022.



На других языках

[de] HD 169830

HD 169830 ist ein etwa 120 Lichtjahre entfernter Hauptreihenstern der Spektralklasse F8 im Sternbild Schütze. Seine Masse liegt bei etwa 1,4 Sonnenmassen. Der Stern wird von zwei spektroskopischen Begleitern umrundet, die als HD 169830 b und HD 169830 c bezeichnet werden und bei denen es sich um Exoplaneten handeln könnte. Die Entdeckung des ersten Begleiters wurde im Jahr 2001 veröffentlicht, diejenige des zweiten folgte drei Jahre später.
- [en] HD 169830

[es] HD 169830

HD 169830 (HR 6907 / HIP 90485 / SAO 186838)[1] es una estrella de magnitud aparente +5,91 situada 1,5º al oeste de Kaus Medius (δ Sagittarii) en la constelación de Sagitario. Se encuentra a 118,5 años luz del Sistema Solar. Desde 2003 se conoce la existencia de dos planetas en órbita alrededor de esta estrella.[2]

[ru] HD 169830

HD 169830 — жёлто-белый карлик в созвездии Стрельца. Спектральный класс F9V. Расположена на расстоянии 118.46 световых лет от нашей солнечной системы. На данный момент известно 2 больших планеты на орбите этой звезды.


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