| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Hercules |
| Right ascension | 18h 02m 30.86234s[1] |
| Declination | +26° 18′ 46.8050″[1] |
| Apparent magnitude (V) | +6.99[2] |
| Characteristics | |
| Spectral type | G9V[3] |
| B−V color index | 0.799±0.005[2] |
| Astrometry | |
| Radial velocity (Rv) | 20.16±0.12[1] km/s |
| Proper motion (μ) | RA: 389.772 mas/yr[1] Dec.: -602.431 mas/yr[1] |
| Parallax (π) | 45.4954 ± 0.0167 mas[1] |
| Distance | 71.69 ± 0.03 ly (21.980 ± 0.008 pc) |
| Details | |
| Mass | 0.874 ± 0.012[3] M☉ |
| Radius | 0.999 ± 0.017[3] R☉ |
| Luminosity | 0.703 ± 0.017[3] L☉ |
| Surface gravity (log g) | 4.387 ± 0.014[3] cgs |
| Temperature | 5390±30[2] K |
| Metallicity [Fe/H] | 0.16 ± 0.05[3] dex |
| Rotation | 42.3+1.3 −0.7 d[2] |
| Rotational velocity (v sin i) | <2.0[2] km/s |
| Age | 13.4,[4] 9.58+1.99 −1.55[2] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 164922 is a seventh magnitude G-type main sequence star in the constellation of Hercules. To view it, binoculars or a telescope are necessary, as it is too faint to be visible to the naked eye. It is 71.7 light-years (22.0 parsecs) distant from the Earth.[1] It will soon evolve away from the main-sequence and expand to become a red giant.[citation needed]
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