Astronomy:HD 169830

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Short description: Star in the constellation Sagittarius
HD 169830
Observation data
Equinox J2000.0]] (ICRS)
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[1] mas
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

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.

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 |♃|J}}}}}} 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. ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.0 3.1 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. doi:10.1086/504637. Bibcode: 2006AJ....132..161G. 
  4. ↑ 4.0 4.1 Soubiran, C. et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics 616: A7. doi:10.1051/0004-6361/201832795. Bibcode: 2018A&A...616A...7S. 
  5. ↑ 5.0 5.1 Fischer, Debra A.; Valenti, Jeff (2005). "The Planet‐Metallicity Correlation". The Astrophysical Journal 622 (2): 1102. doi:10.1086/428383. Bibcode: 2005ApJ...622.1102F. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 Naef, D. et al. (2001). "The CORALIE survey for southern extrasolar planets V. 3 new extrasolar planets". Astronomy and Astrophysics 375 (1): 205–218. doi:10.1051/0004-6361:20010841. Bibcode: 2001A&A...375..205N. http://www.aanda.org/articles/aa/full/2001/31/aa10239/aa10239.html. 
  7. ↑ 7.0 7.1 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. doi:10.1051/0004-6361:20034250. Bibcode: 2004A&A...415..391M. http://www.aanda.org/articles/aa/full/2004/07/aa0250/aa0250.html. 
  8. ↑ 8.0 8.1 8.2 8.3 Saffe, C. et al. (2005). "On the Ages of Exoplanet Host Stars". Astronomy and Astrophysics 443 (2): 609–626. doi:10.1051/0004-6361:20053452. Bibcode: 2005A&A...443..609S. 
  9. ↑ "HD 169830". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+169830. 
  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. doi:10.1051/0004-6361/201833456. Bibcode: 2018A&A...616A..37B. 
  11. ↑ Raghavan, Deepak et al. (2006). "Two Suns in The Sky: Stellar Multiplicity in Exoplanet Systems". The Astrophysical Journal 646 (1): 523–542. doi:10.1086/504823. Bibcode: 2006ApJ...646..523R. 
  12. ↑ "Exoplanets Galore!" (Press release). Garching, Germany: European Southern Observatory. April 15, 2000. Retrieved December 30, 2012.
  13. ↑ 13.0 13.1 Feng, Fabo et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series 262 (21): 21. doi:10.3847/1538-4365/ac7e57. Bibcode: 2022ApJS..262...21F. 
  14. ↑ "HD 169830". https://exoplanetarchive.ipac.caltech.edu/overview/HD%20169830. Retrieved 2 September 2022. 

External links

Coordinates: Sky map 18h 27m 49.4838s, −29° 49′ 00.715″



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