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HD 191806

Coordinates: Sky map 20h 11m 30.7166s, −64° 37′ 13.694″
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HD 191806
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cygnus
Right ascension 20h 09m 28.30930s[1]
Declination +52° 16′ 34.8018″[1]
Apparent magnitude (V) 8.093[2]
Characteristics
Spectral type K0[3]
Apparent magnitude (B) 8.71[2]
Apparent magnitude (J) 6.966[4]
Apparent magnitude (H) 6.713[4]
Apparent magnitude (K) 6.639[4]
B−V color index +0.64[5]
Astrometry
Radial velocity (Rv)−15.28±0.16[1] km/s
Proper motion (μ) RA: 114.051[1] mas/yr
Dec.: 91.193[1] mas/yr
Parallax (π)15.1995 ± 0.0258 mas[1]
Distance214.6 ± 0.4 ly
(65.8 ± 0.1 pc)
Absolute magnitude (MV)3.89±0.08[5]
Details[5]
Mass1.14±0.12 M
Radius1.40+0.03
−0.02
[1] R
Luminosity2.23±0.16 L
Surface gravity (log g)4.45±0.03 cgs
Temperature6,010±30 K
Metallicity [Fe/H]+0.30±0.02 dex
Rotation20.6±6.9 d
Rotational velocity (v sin i)3.3 km/s
Age2.9±0.4 Gyr
Other designations
BD+51°2782, HD 191806, HIP 99306, SAO 32320[6]
Database references
SIMBADdata
Exoplanet Archivedata

HD 191806 is an 8th magnitude K-type star located approximately 226 light years away in the constellation Cygnus. In 2016, a massive gas giant planet was found in orbit around the star.

The HD 191806 planetary system[5]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b ≥8.52 ± 0.63 MJ 2.8 ± 0.1 1606.3 ± 7.2 0.259 ± 0.017

See also

References

  1. ^ a b c d e f g 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.
  2. ^ a b Høg, E.; Fabricius, C.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H.
  3. ^ 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.
  4. ^ a b c Cutri, R. M.; Skrutskie, M. F. (2003). "2MASS All-Sky Catalog of Point Sources". VizieR Online Data Catalog: II/246. Bibcode:2003yCat.2246....0C.
  5. ^ a b c d Daiz, R. F.; Rey, J.; et al. (2016). "The SOPHIE search for northern extrasolar planets. XI. Three new companions and an orbit update: Giant planets in the habitable zone". Astronomy and Astrophysics. 591. A146. arXiv:1604.07610. Bibcode:2016A&A...591A.146D. doi:10.1051/0004-6361/201628331. S2CID 3282336.
  6. ^ "HD 191806". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-09.