HD 191806
HD 191806 has a stellar classification of G0V, indicating that it is a G-type main sequence star. It has 110% the mass of the Sun and a slightly enlarged radius of 1.48 R☉. It radiates at 2.23 times the luminosity of the Sun from its photosphere at an effective temperature of 5,894 K, 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. It spins with a projected rotational velocity of 3.3 km/s, which corresponds to a rotational period of 21 days.
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. After ten years of, a team of astronomers found a super Jupiter orbiting the star. The star has a secular acceleration of >11 km/s, suggesting either the presence of a stellar companion or another planet. In 2022, the inclination and true mass of HD 191806 b were measured via astrometry.
| 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
References
- ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 – L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
- ^ 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. arXiv:1011.2020. Bibcode:2010PASP..122.1437P. doi:10.1086/657947. S2CID 54678796.
- ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 119257644.
- ^ Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256.
- ^ 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. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. ISSN 0004-6361.
- ^ Díaz, R. F.; et al. (July 2016). "The SOPHIE search for northern extrasolar planets". Astronomy & Astrophysics. 591: A146. arXiv:1604.07610. Bibcode:2016A&A...591A.146D. doi:10.1051/0004-6361/201628331. eISSN 1432-0746. ISSN 0004-6361.
- ^ "HD 191806". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-09.
- ^ 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. arXiv:astro-ph/0701631. Bibcode:2007ApJS..169..430R. doi:10.1086/513108. eISSN 1538-4365. ISSN 0067-0049.
- ^ 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): 21. arXiv:2208.12720. Bibcode:2022ApJS..262...21F. doi:10.3847/1538-4365/ac7e57. S2CID 251864022.