HD 164509
HD 164509 is a binary star system in the constellation of Ophiuchus. The primary component has an orbiting exoplanet companion. This system is located at a distance of 175 light years based on parallax measurements, and is drifting further away with a radial velocity of 13.7 km/s. It has an absolute magnitude of 4.64, but at that distance the system has an apparent visual magnitude of 8.10, which is too faint to be seen with the naked eye.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 18h 01m 31.228s |
| Declination | 00° 06′ 16.40″ |
| Apparent magnitude (V) | 8.10 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | G2V + M6.5V |
| B−V color index | 0.665±0.018 |
| J−H color index | 0.28 |
| J−K color index | 0.36 |
| Astrometry | |
| Radial velocity (Rv) | 13.68±0.16 km/s |
| Proper motion (μ) | RA: −7.876 mas/yr Dec.: −20.462 mas/yr |
| Parallax (π) | 18.6155 ± 0.0219 mas |
| Distance | 175.2 ± 0.2 ly (53.72 ± 0.06 pc) |
| Absolute magnitude (MV) | 4.64 |
| Details | |
| HD 164509 A | |
| Mass | 1.103±0.004 M☉ |
| Radius | 1.041±0.003 R☉ |
| Luminosity | 1.150±0.001 L☉ |
| Surface gravity (log g) | 4.44±0.01 cgs |
| Temperature | 5,865±7 K |
| Metallicity [Fe/H] | 0.21 dex |
| Rotational velocity (v sin i) | 2.4±0.5 km/s |
| Age | 1.5±0.2 Gyr |
| HD 164509 B | |
| Mass | 0.45±0.01 M☉ |
| Temperature | 2,710 K |
| Other designations | |
| Database references | |
| SIMBAD | 164509 data |
The primary component is a Sun-like G-type main-sequence star with a stellar classification of G2V. It is young and metal rich, having heavy elements abundance 160% of solar. The star has a modest level of magnetic activity in its chromosphere. It has 1.10 times the mass of the Sun and 1.04 times the Sun's radius. This star is radiating 1.15 times the luminosity of the Sun from its photosphere at an effective temperature of 5,865 K.
Initially it was thought the system consisted of a single star, but in 2016 it was discovered the primary is accompanied by the M-class red dwarf star at a projected separation of 36.5±1.9 AU. The evidence for this stellar companion being on a bound orbit was further fortified in 2017.