Gamma Librae
Gamma Librae (γ Librae, abbreviated Gamma Lib, γ Lib) is a suspected binary star system in the constellation of Libra. It is visible to the naked eye, having an apparent visual magnitude of +3.91. Based upon an annual parallax shift of 19.99 mas as seen from Earth, it lies 163 light years from the Sun.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Libra |
| Right ascension | 15h 35m 31.57881s |
| Declination | −14° 47′ 22.3278″ |
| Apparent magnitude (V) | +3.91 |
| Characteristics | |
| Spectral type | G8.5 III |
| Astrometry | |
| Radial velocity (Rv) | −26.71 km/s |
| Proper motion (μ) | RA: +65.34 mas/yr Dec.: +7.45 mas/yr |
| Parallax (π) | 19.99 ± 0.20 mas |
| Distance | 163 ± 2 ly (50.0 ± 0.5 pc) |
| Absolute magnitude (MV) | −1.59 |
| Details | |
| γ Lib A | |
| Mass | 1.15 M☉ |
| Radius | 11.14 R☉ |
| Luminosity | 72 L☉ |
| Surface gravity (log g) | 2.81±0.18 cgs |
| Temperature | 4826±48 K |
| Metallicity [Fe/H] | −0.26±0.03 dex |
| Rotational velocity (v sin i) | 1.60 km/s |
| Age | 4.31 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
The primary component (designated Gamma Librae A) has been formally named Zubenelhakrabi /zuːˌbɛnɛlˈhækrəbi/, the traditional name of the system.
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