HD 128429
HD 128429 is a binary star system located at a distance of 88 light years from the Sun in the southern zodiac constellation of Libra. It has a yellow-white hue and is just barely visible to the naked eye with an apparent visual magnitude of 6.20. The system is drifting closer to the Sun with a radial velocity of −66 km/s and has a high proper motion, traversing the celestial sphere at the rate of 0.945″ per year. It is a well-known high velocity star system with a net heliocentric velocity of 158.8 km/s. The system is orbiting the through the galaxy with a high eccentricity of 0.62, which carries it from as close as 4.1 out to 17.5 kpc away from the Galactic Center.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Libra |
| Right ascension | 14h 36m 59.79592s |
| Declination | −12° 18′ 19.0687″ |
| Apparent magnitude (V) | 6.197±0.005 |
| Characteristics | |
| Evolutionary stage | Blue straggler |
| Spectral type | F6V |
| B−V color index | 0.464±0.011 |
| Astrometry | |
| Radial velocity (Rv) | −66.1±0.5 km/s |
| Proper motion (μ) | RA: −868.62 mas/yr Dec.: −364.52 mas/yr |
| Parallax (π) | 37.1800 ± 0.4010 mas |
| Distance | 87.7 ± 0.9 ly (26.9 ± 0.3 pc) |
| Absolute magnitude (MV) | 3.66 |
| Orbit | |
| Companion | Ab |
| Period (P) | 1,086±77 d |
| Semi-major axis (a) | 1.589 AU |
| Eccentricity (e) | ≤ 0.15 |
| Details | |
| Aa | |
| Mass | 1.32 M☉ |
| Radius | 1.39±0.06 R☉ |
| Luminosity | 2.75 L☉ |
| Surface gravity (log g) | 4.28±0.10 cgs |
| Temperature | 6,341±70 K |
| Metallicity [Fe/H] | −0.10±0.06 dex |
| Rotational velocity (v sin i) | 16.2±0.5 km/s |
| Age | 1.7±0.6 Gyr 3.10 Gyr |
| Ab | |
| Mass | 0.49±0.09 M☉ 0.130+0.036 −0.015 M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
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