HD 164922
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| Observation data Epoch J2000.0 |
|
|---|---|
| Constellation (pronunciation) |
Hercules |
| Right ascension | 18h 02m 30.86s |
| Declination | +26° 18′ 46.81″ |
| Apparent magnitude (V) | +7.01 |
| Characteristics | |
| Spectral type | K0V |
| U-B color index | 0.47 |
| B-V color index | 0.80 |
| V-R color index | 0.42 |
| R-I color index | 0.36 |
| Variable type | suspected |
| Astrometry | |
| Radial velocity (Rv) | +22.8 km/s |
| Proper motion (μ) | RA: 389.77 mas/yr Dec.: −602.44 mas/yr |
| Parallax (π) | 45.61 ± 0.71 mas |
| Distance | 71.5 ly (21.93 pc) |
| Absolute magnitude (MV) | 5.31 |
| Details | |
| Mass | 0.94 M☉ |
| Radius | 0.9 R☉ |
| Surface gravity (log g) | 4.53 |
| Luminosity | 0.608 L☉ |
| Temperature | 5385 K |
| Metallicity | 0.17 / 148% |
| Rotation | ? |
| Age | 13.4 × 109 years |
| Other designations | |
|
BD+26°3151, GJ 700.2, Wo 9613, LFT 1388, LTT 15327, SAO 85678, HIP 88348
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HD 164922 is a seventh magnitude star in the constellation of Hercules. It is an orange dwarf with a spectral type K0V. To view it, binoculars or a telescope are necessary, as it is too faint to be visible to the naked eye. It is 71.5 light years distant from the Earth. At an age of 13.4 billion years, it will soon evolve away from the main-sequence and expand to become a red giant. Its metallicity is nearly 50% more than the Sun.
On 15 July 2006, a long period Saturn-mass planet was announced orbiting HD 164922.
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