| Observation data Epoch J2000.0 Equinox J2000.0 |
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|---|---|
| Constellation | Libra |
| Right ascension | 15h 04m 4.26s |
| Declination | -25° 16' 54.7" |
| Apparent magnitude (V) | +3.25 |
| Absolute magnitude (V) | -1.51 |
| Distance | 292 ly (89.57 pc) |
| Spectral type | M3/M4III |
| Other designations | |
Sigma Librae (σ Lib, σ Librae) is a star in the constellation Libra. It has the traditional names Brachium ("Arm"Latin), Cornu ("Horn"Latin), and Zubenalgubi ("Southern Claw"Arabic).
This star was originally given the Bayer designation "Gamma Scorpii" (γ Sco) despite the fact that it is well within the constellation Libra and far from the boundary with Scorpius. It did not receive its current Bayer designation as Sigma Librae until the 19th century.
Sigma Librae is of apparent magnitude +3.25 and belongs to the spectral class M3-III. It is approximately 292 light years from Earth.
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