HD 191806
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.
| 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 | — | — |
| 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[1] mas |
| Distance | 214.6 ± 0.4 ly (65.8 ± 0.1 pc) |
| Absolute magnitude (MV) | 3.89±0.08[5] |
| Details[5] | |
| Mass | 1.14±0.12 M☉ |
| Radius | 1.40+0.03 −0.02[1] R☉ |
| Luminosity | 2.23±0.16 L☉ |
| Surface gravity (log g) | 4.45±0.03 cgs |
| Temperature | 6,010±30 K |
| Metallicity [Fe/H] | +0.30±0.02 dex |
| Rotation | 20.6±6.9 d |
| Rotational velocity (v sin i) | 3.3 km/s |
| Age | 2.9±0.4 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
See also
- List of extrasolar planets
References
- 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.
- 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.
- 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.
- Cutri, R. M.; Skrutskie, M. F. (2003). "2MASS All-Sky Catalog of Point Sources". VizieR Online Data Catalog: II/246. Bibcode:2003yCat.2246....0C.
- 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.
- "HD 191806". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-09.
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