HD 174569
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 18h 50m 45.5515s |
| Declination | +10° 58′ 34.997″ |
| Apparent magnitude (V) | 6.36 |
| Characteristics | |
| Spectral type | K5III + K3III-IV |
| U−B color index | +1.63 |
| B−V color index | +1.44 |
| Astrometry | |
| A | |
| Radial velocity (Rv) | −25.61±0.14 km/s |
| Proper motion (μ) | RA: +8.168 mas/yr Dec.: +5.959 mas/yr |
| Parallax (π) | 4.4674±0.0200 mas |
| Distance | 730 ± 3 ly (224 ± 1 pc) |
| B | |
| Radial velocity (Rv) | −27 km/s |
| Proper motion (μ) | RA: +8.623 mas/yr Dec.: +6.146 mas/yr |
| Parallax (π) | 4.4157 ± 0.0232 mas |
| Distance | 739 ± 4 ly (226 ± 1 pc) |
| Details | |
| A | |
| Mass | 1.2 M☉ |
| Radius | 37 R☉ |
| Luminosity | 318 L☉ |
| Surface gravity (log g) | 1.52 cgs |
| Temperature | 3,922 K |
| Metallicity [Fe/H] | 0.51 dex |
| B | |
| Mass | 1.4 M☉ |
| Radius | 18 R☉ |
| Luminosity | 141 L☉ |
| Surface gravity (log g) | 2.46 cgs |
| Temperature | 4,808 K |
| Metallicity [Fe/H] | −0.09 dex |
| Other designations | |
| BD+10°3685, HD 174569, HIP 92475, HR 7099, SAO 104170. | |
| Database references | |
| SIMBAD | data |
| A | |
| B | |
HD 174569 is a spectroscopic binary star system in the equatorial constellation of Aquila. Based on stellar parallax measurements by Gaia, it is about 730-740 light-years (400 parsecs) away.
Both components are giant stars that exhausted their hydrogen supply. Star A has a class K5III, while star B has a class K3III-IV.