| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Lupus |
| Right ascension | 15h 35m 8.5s |
| Declination | −41° 10' 1" |
| Apparent magnitude (V) | 2.80 |
| Characteristics | |
| Spectral type | B2IV |
| Astrometry | |
| Distance | 567 ly (173.93 pc) |
| Absolute magnitude (MV) | -3.40 |
| Orbit[1] | |
| Companion | Gamma Lupi AB |
| Period (P) | 190.0 yr |
| Semimajor axis (a) | 0.655" |
| Eccentricity (e) | 0.51 |
| Inclination (i) | 95.0° |
| Longitude of the node (Ω) | 94.6° |
| Periastron epoch (T) | 1885.0 |
| Argument of periastron (ω) (secondary) |
311.5° |
| Other designations | |
Gamma Lupi (γ Lupi, γ Lup) is a 3rd-magnitude, B-type blue giant star in the constellation of Lupus. It is also known in ancient Chinese astronomy as 騎官一 or "the 1st (star) of the Cavalry Officer". With a telescope, Gamma Lupi can be resolved into a binary star system in close orbit. This is known as the Gamma Lupi AB system, often abbreviated as γ Lupi AB or γ Lup AB. Gamma Lupi A is itself a spectroscopic binary with a period of 2.8081[2] days.
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