Alpha Lupi
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| Observation data Epoch J2000 |
|
|---|---|
| Constellation (pronunciation) |
Lupus |
| Right ascension | 14h 41m 55.8s |
| Declination | -47° 23′ 18″ |
| Apparent magnitude (V) | 2.30 |
| Characteristics | |
| Spectral type | B1.5 III |
| U-B color index | -0.89 |
| B-V color index | -0.20 |
| Variable type | Beta Cephei |
| Astrometry | |
| Radial velocity (Rv) | 5 km/s |
| Proper motion (μ) | RA: -21.15 mas/yr Dec.: -24.22 mas/yr |
| Parallax (π) | 5.95 ± 0.76 mas |
| Distance | approx. 550 ly (approx. 170 pc) |
| Absolute magnitude (MV) | -3.83 |
| Details | |
| Mass | 10–11 M☉ |
| Radius | 10 R☉ |
| Luminosity | 18,000 L☉ |
| Temperature | 21,600 K |
| Metallicity | ? |
| Rotation | 24 km/s. |
| Age | 2 × 107 years |
| Other designations | |
Alpha Lupi (α Lup / α Lupi) is a star in the constellation Lupus. It is called the traditional Chinese name Men, and sometimes by the Arabic name Kakkab, which means "Guide Star" or "Star of Fortune".
It is a Beta Cephei variable with a period of just over 6 hours, 14 minutes, and the magnitude varies by about 0.03, or about 3% of the total luminosity. A small star situated near Alpha Lupi may just be an optical companion.
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