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 28.30960s[1] |
| Declination | +52° 16′ 34.79″[1] |
| Apparent magnitude (V) | 8.093[2] |
| Characteristics | |
| Spectral type | K0 |
| Apparent magnitude (B) | 8.71[2] |
| Apparent magnitude (J) | 6.966[3] |
| Apparent magnitude (H) | 6.713[3] |
| Apparent magnitude (K) | 6.639[3] |
| B−V color index | +0.64[4] |
| Astrometry | |
| Proper motion (μ) | RA: 113.90[1] mas/yr Dec.: 90.05[1] mas/yr |
| Parallax (π) | 14.41 ± 0.50[1] mas |
| Distance | 226 ± 8 ly (69 ± 2 pc) |
| Absolute magnitude (MV) | 3.89 ± 0.08[4] |
| Details[4] | |
| Mass | 1.14 ± 0.12 M☉ |
| Luminosity | 2.23 ± 0.16 L☉ |
| Surface gravity (log g) | 4.45 ± 0.03 cgs |
| Temperature | 6010 ± 30 K |
| Metallicity | +0.30 ± 0.02 |
| Rotation | 20.6 ± 6.9 d |
| Age | 2.9 ± 0.4 Gyr |
| Other designations | |
BD+51° 2782, HIP 99306, SAO 32320 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
See also
- List of extrasolar planets
References
- van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
- Høg, E.; Fabricius, C.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355. Bibcode:2000A&A...355L..27H.
- Cutri, R. M.; Skrutskie, M. F. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources". Bibcode:2003yCat.2246....0C. Cite journal requires
|journal=(help) - Daiz, R. F.; Rey, J.; et al. (2013). "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.
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