HD 185351
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  | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 19h 36m 37.977s[2] |
| Declination | +44° 41′ 41.76″[2] |
| Apparent magnitude (V) | 5.17[1] |
| Characteristics | |
| Evolutionary stage | Red-giant branch[3][4][2] |
| Spectral type | G8.5IIIb Fe−0.5[5] |
| B−V color index | 0.928±0.001[1] |
| Astrometry | |
| Radial velocity (Rv) | −5.422±0.006[6] km/s |
| Proper motion (μ) | RA: −95.016 mas/yr[2] Dec.: −104.858 mas/yr[2] |
| Parallax (π) | 24.261±0.0573 mas[2] |
| Distance | 134.4 ± 0.3 ly (41.22 ± 0.10 pc) |
| Absolute magnitude (MV) | 2.13[4] |
| Details | |
| Mass | 1.58+0.04 −0.02[7] M☉ |
| Radius | 4.946±0.043[8] R☉ |
| Luminosity | 14.008±0.133[8] L☉ |
| Surface gravity (log g) | 3.288±0.046[8] cgs |
| Temperature | 5,025±22[8] K |
| Metallicity [Fe/H] | −0.02±0.07[8] dex |
| Rotational velocity (v sin i) | 2.14±0.23[9] km/s |
| Age | 2.32+0.04 −0.07[7] Gyr |
| Other designations | |
| BD+44°3185, HD 185351, HIP 96459, HR 7468, SAO 48649, PPM 58585[10] | |
| Database references | |
| SIMBAD | data |
HD 185351 is a star in the constellation of Cygnus, the swan. With an apparent visual magnitude of 5.17,[1] 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.[2] It is drifting closer with a heliocentric radial velocity of −5.4 km/s.[6]
This was the third brightest star in the view field of the Kepler space telescope, with only θ Cyg and CH Cyg being brighter. The resulting data was used to measure asteroseismic oscillations that yielded a mass estimate for HD 185351, after incorporating interferometric and spectroscopic observations.[4] The result is consistent with the value of 1.60 M☉ provided by a refined stellar model.[7] 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".[4]
HD 185351 has a stellar classification of G8.5IIIb Fe−0.5,[5] suggesting this is a late G-type giant star with a mild underabundance of iron compared to similar stars. It has expanded to nearly five times the radius of the Sun and is radiating 14 times the Sun's luminosity.[8] The star has an estimated age of 2.3 billion years[7] and is spinning with a projected rotational velocity of 2 km/s.[9]
As of 2011, searches for planetary companions using Doppler spectroscopy were unsuccessful.[4]