HD 191104
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Right ascension | 20h 07m 50.36773s |
| Declination | +09° 23′ 59.4022″ |
| Apparent magnitude (V) | 6.443 |
| Characteristics | |
| Spectral type | F3V |
| U−B color index | −0.033 |
| B−V color index | +0.472 |
| Astrometry | |
| Radial velocity (Rv) | −27 km/s |
| Proper motion (μ) | RA: +46.75 mas/yr Dec.: +28.81 mas/yr |
| Parallax (π) | 25.40±1.00 mas |
| Distance | 128 ± 5 ly (39 ± 2 pc) |
| Absolute magnitude (MV) | +3.46 |
| Orbit | |
| Primary | A |
| Companion | B |
| Period (P) | 604.7 yr |
| Semi-major axis (a) | 3.4″ |
| Orbit | |
| Primary | Ba |
| Companion | Bb |
| Period (P) | 23.8 days |
| Eccentricity (e) | 0.123 |
| Semi-amplitude (K1) (primary) | 16.2 km/s |
| Semi-amplitude (K2) (secondary) | 16.6 km/s |
| Details | |
| A | |
| Mass | 1.2 M☉ |
| Radius | 1.4 R☉ |
| Luminosity | 2.9 L☉ |
| Temperature | 6,615 K |
| Rotation | 9.34 days |
| Age | 722 Myr |
| Ba | |
| Mass | 0.74 M☉ |
| Bb | |
| Mass | 0.72 M☉ |
| Other designations | |
| BD+08°4344, HD 191104, HIP 99158, HR 7693, SAO 125478 | |
| Database references | |
| SIMBAD | data |
| A | |
| B | |
HD 191104 is a star system in the equatorial constellation of Aquila. Two of the components form a close spectroscopic binary system, while a third star, also thought to be a spectroscopic binary, orbits the pair at a greater distance.