  | |
| 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 | Subgiant[3] |
| Spectral type | G8.5IIIb Fe−0.5[4] |
| B−Vcolor index | 0.928±0.001[1] |
| Astrometry | |
| Radial velocity (Rv) | −5.422±0.006[5] km/s |
| Proper motion (μ) | RA: −95.016mas/yr[2] Dec.: −104.858mas/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[3] |
| Details | |
| Mass | 1.58+0.04 −0.02[6] M☉ |
| Radius | 4.946±0.043[7] R☉ |
| Luminosity | 14.008±0.133[7] L☉ |
| Surface gravity (log g) | 3.288±0.046[7] cgs |
| Temperature | 5,025±22[7] K |
| Metallicity [Fe/H] | −0.02±0.07[7] dex |
| Rotational velocity (v sin i) | 2.14±0.23[8] km/s |
| Age | 2.32+0.04 −0.07[6] Gyr |
| Other designations | |
| BD+44°3185,HD 185351,HIP 96459,HR 7468,SAO 48649,PPM 58585[9] | |
| Database references | |
| SIMBAD | data |
HD 185351 is astar in theconstellation ofCygnus, the swan. With anapparent visual magnitude of 5.17,[1] it is faintly visible to thenaked eye on a dark night. Based onparallax measurements, HD 185351 is located at a distance of 134 light years from theSun.[2] It is drifting closer with a heliocentricradial velocity of −5.4 km/s.[5]
This was the third brightest star in the view field of theKepler space telescope, with onlyθ Cyg andCH Cyg being brighter. The resulting data was used to measureasteroseismic oscillations that yielded a mass estimate for HD 185351, after incorporatinginterferometric andspectroscopic observations.[3] The result is consistent with the value of 1.60 M☉ provided by a refined stellar model.[6] In the past, the star was likely anA-type main-sequence star similar toProcyon. Hence, it is sometimes dubbed a "retired A star".[3]
HD 185351 has astellar classification of G8.5IIIb Fe−0.5,[4] suggesting this is alateG-typegiant star with a mild underabundance of iron compared to similar stars. However, its location on theH-R diagram is more consistent with being a lessevolvedsubgiant star.[3] It has expanded to nearly five times the radius of the Sun and is radiating 14 times the Sun's luminosity.[7] The star has an estimated age of 2.3 billion years[6] and is spinning with aprojected rotational velocity of 2 km/s.[8]
As of 2011, searches for planetary companions usingDoppler spectroscopy were unsuccessful.[3]