HD 191806

From Wikipedia, the free encyclopedia
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] or G0IV-V
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[1] mas
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
Extrasolar Planets
Encyclopaedia		data

HD 191806 is an 8th magnitude K-type star located approximately 226 light years away in the 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 214.6 light years based on parallax, but is drifting towards the Solar System with a radial velocity of -15.28 km/s.

Properties[]

This is a star with 1.14 times the mass of the Sun and a radius 40% larger than that of the Sun. HD 191806 has twice the luminosity of the Sun and an effective temperature of 6,010 K, which gives it a yellow hue. The star is also younger than the Sun, with an age of almost 3 billion years, and rotates slightly faster than the Sun.

Planetary System[]

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[]

  • List of extrasolar planets

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 Díaz, Rodrigo F.; Rey, Javiera; Demangeon, Olivier D. S.; Hébrard, Guillaume; Boisse, Isabelle; Arnold, Luc; Astudillo-Defru, Nicola; Beuzit, Jean-Luc; Bonfils, Xavier; Borgniet, Simon; Bouchy, François; Bourrier, Vincent; Courcol, Bastien; Deleuil, Magali; Delfosse, Xavier; Ehrenreich, David; Forveille, Thierry; Lagrange, Anne-Marie; Mayor, Michel; Moutou, Claire; Pepe, Francesco; Queloz, Didier; Santerne, Alexandre; Santos, Nuno C.; Sahlmann, Johannes; Ségransan, Damien; Udry, Stéphane; Wilson, Paul A. (2016). "The SOPHIE search for northern extrasolar planets XI. Three new companions and an orbit update: Giant planets in the habitable zone". Astronomy & 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.

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

Retrieved from ""