Astronomy:HD 191806

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Short description: Star in the constellation Cygnus
HD 191806
Observation data
Equinox J2000.0]] (ICRS)
Constellation Cygnus
Right ascension  20h 09m 28.30936s[1]
Declination +52° 16′ 34.8000″[1]
Apparent magnitude (V) 8.08±0.01[2]
Characteristics
Spectral type rG0V[3]
B−V color index +0.63[2]
Astrometry
Radial velocity (Rv)−15.33±0.13[1] km/s
Proper motion (μ) RA: 114.022±0.022[1] mas/yr
Dec.: 91.296±0.022[1] mas/yr
Parallax (π)15.1975 ± 0.0182[1] mas
Distance214.6 ± 0.3 ly
(65.80 ± 0.08 pc)
Absolute magnitude (MV)+3.89[4]
Details
Mass1.1±0.1[5] M☉
Radius1.48+0.14−0.13[6] R☉
Luminosity2.23±0.16[7] L☉
Surface gravity (log g)4.15±0.15[6] cgs
Temperature5,894+155−86[5] K
Metallicity [Fe/H]+0.30±0.02[7] dex
Rotation20.6±6.9 d[7]
Rotational velocity (v sin i)3.3[7] km/s
Age2.9±0.4[7] Gyr
Other designations
BD+51°2782, HD 191806, HIP 99306, SAO 32320[8]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

HD 191806 is a star located in the northern constellation Cygnus. With an apparent magnitude of 8.093, it's undetectable with the naked eye, but can be seen with binoculars. HD 191806 is currently placed at a distance of 215 light years based on parallax measurements and is drifting towards the Solar System with a spectroscopic radial velocity of −15.28 km/s.

HD 191806 has a stellar classification of G0V,[3] indicating that it is a G-type main sequence star. It has 110% the mass of the Sun[5] and a slightly enlarged radius of 1.48 R☉.[6] It radiates at 2.23 times the luminosity of the Sun[7] from its photosphere at an effective temperature of 5,894 K,[5] giving a yellow hue. HD 191806 is estimated to be about 3 billion years old and has a metallicity nearly twice of the Sun's.[7] It spins with a projected rotational velocity of 3.3 km/s, which corresponds to a rotational period of 21 days.[7]

Planetary System

Observations for exoplanets orbiting the star began in 2007 when it was selected by the N2K Consortium as a potential host due to its high metallicity.[9] After ten years of, a team of astronomers found a super Jupiter orbiting the star.[7] The star has a secular acceleration of >11 km/s, suggesting either the presence of a stellar companion or another planet.[7] In 2022, the inclination and true mass of HD 191806 b were measured via astrometry.[10]

The HD 191806 planetary system[10]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(years) 		Eccentricity Inclination Radius
b 9.334+0.919
−0.852 MJ 		2.749+0.106
−0.118 		4.390+0.027
−0.031 		0.213+0.029
−0.028 		66.519+5.830
−4.851° 		—

See also

  • List of extrasolar planets

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 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 Pickles, A.; Depagne, É. (2010). "All-Sky Spectrally Matched UBVRI - ZY and u′ g′ r′ i′ z′ Magnitudes for Stars in the Tycho2 Catalog". Publications of the Astronomical Society of the Pacific 122 (898): 1437. doi:10.1086/657947. Bibcode: 2010PASP..122.1437P. 
  4. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A. 
  5. ↑ 5.0 5.1 5.2 5.3 Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S. 
  6. ↑ 6.0 6.1 6.2 Allende Prieto, C.; Lambert, D. L. (December 1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics 352: 555–562. ISSN 0004-6361. Bibcode: 1999A&A...352..555A. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 Díaz, R. F. et al. (July 2016). "The SOPHIE search for northern extrasolar planets". Astronomy & Astrophysics 591: A146. doi:10.1051/0004-6361/201628331. ISSN 0004-6361. Bibcode: 2016A&A...591A.146D. 
  8. ↑ "HD 191806". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+191806. 
  9. ↑ Robinson, Sarah E.; Ammons, S. Mark; Kretke, Katherine A.; Strader, Jay; Wertheimer, Jeremy G.; Fischer, Debra A.; Laughlin, Gregory (April 2007). "The N2K Consortium. VII. Atmospheric Parameters of 1907 Metal‐rich Stars: Finding Planet‐Search Targets". The Astrophysical Journal Supplement Series 169 (2): 430–438. doi:10.1086/513108. ISSN 0067-0049. Bibcode: 2007ApJS..169..430R. 
  10. ↑ 10.0 10.1 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. 

Coordinates: Sky map 20h 11m 30.7166s, −64° 37′ 13.694″



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