Location of HD 185351 (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19 36 37.977 |
| Declination | +44° 41′ 41.76″ |
| Apparent magnitude (V) | 5.17 |
| Characteristics | |
| Evolutionary stage | Subgiant |
| Spectral type | G8.5IIIb Fe−0.5 |
| B−V color index | 0.928±0.001 |
| Astrometry | |
| Radial velocity (Rv) | −5.422±0.006 km/s |
| Proper motion (μ) | RA: −95.016 mas/yr Dec.: −104.858 mas/yr |
| Parallax (π) | 24.261 ± 0.0573 mas |
| Distance | 134.4 ± 0.3 ly (41.22 ± 0.10 pc) |
| Absolute magnitude (MV) | 2.13 |
| Details | |
| Mass | 1.58 −0.02 M☉ |
| Radius | 4.92 −0.07 R☉ |
| Luminosity | 13.8 L☉ |
| Surface gravity (log g) | 3.25 −0.02 cgs |
| Temperature | 5,042±32 K K |
| Metallicity | 0.16 dex |
| Rotational velocity (v sin i) | 2.14±0.23 km/s |
| Age | 2.32 −0.07 Gyr |
| Other designations | |
| BD+44° 3185, HD 185351, HIP 96459, HR 7468, SAO 48649, PPM 58585 | |
| Database references | |
| SIMBAD | data |
HD 185351 is a star in the constellation of Cygnus, the swan. With an apparent visual magnitude of 5.17, it is faintly visible to the naked eye on a dark night. Based on parallax measurements, HD 185351 is located at a distance of 134 light years from the Sun. It is drifting closer with a heliocentric radial velocity of −5.4 km/s.
This was the third brightest star in the view field of the Kepler space telescope, with θ Cyg and CH Cyg being the brightest. The resulting data was used to measure asteroseismic oscillations that yielded a mass estimate for HD 185351, after incorporating interferometric and spectroscopic observations. The result is consistent with the value of 1.60 M☉ provided by a refined stellar model. In the past, the star was likely an A-type main-sequence star similar to Procyon. Hence, it is sometimes dubbed a "retired A star".
HD 185351 has a stellar classification of G8.5IIIb Fe−0.5, suggesting this is a late G-type giant star with a mild underabundance of iron compared to similar stars. However, its location on the H-R diagram is more consistent with being a less evolved subgiant star. It has expanded to nearly five times the radius of the Sun and is radiating 13.8 times the Sun's luminosity. The star has an estimated age of 2.3 billion years and is spinning with a projected rotational velocity of 2 km/s.
As of 2011, searches for planetary companions using Doppler Spectroscopy were unsuccessful.
References
- ^ 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.
- ^ 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.
- ^ Johnson, John Asher; et al. (October 2014), "The physical parameters of the retired A star HD 185351", The Astrophysical Journal, 794 (1), id. 15, arXiv:1407.2329, Bibcode:2014ApJ...794...15J, doi:10.1088/0004-637X/794/1/15.
- ^ Keenan, Philip C.; McNeil, Raymond C (1989), "The Perkins catalog of revised MK types for the cooler stars", The Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373, S2CID 123149047.
- ^ Jönsson, Henrik; et al. (August 17, 2020), "APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South", The Astronomical Journal, 160 (3), American Astronomical Society: 120, arXiv:2007.05537, Bibcode:2020AJ....160..120J, doi:10.3847/1538-3881/aba592, ISSN 0004-6256.
- ^ Hjørringgaard, J. G.; et al. (January 2017), "Testing stellar evolution models with the retired A star HD 185351", Monthly Notices of the Royal Astronomical Society, 464 (3): 3713–3719, arXiv:1610.05990, Bibcode:2017MNRAS.464.3713H, doi:10.1093/mnras/stw2559.
{{citation}}: CS1 maint: unflagged free DOI (link) - ^ Jofré, E.; et al. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics, 574: A50, arXiv:1410.6422, Bibcode:2015A&A...574A..50J, doi:10.1051/0004-6361/201424474, S2CID 53666931.
- "HD 185351", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2025-01-30.