Alpha Lupi
Alpha Lupi (α Lupi, α Lup) is a blue giant star, and the brightest star in the southern constellation of Lupus. According to the Bortle Dark-Sky Scale, its apparent visual magnitude of 2.3 makes it readily visible to the naked eye even from highly light-polluted locales. Based upon parallax measurements made during the Hipparcos mission, the star is around 460 light-years (140 parsecs) from the solar system. It is one of the nearest supernova candidates.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lupus |
| Right ascension | 14h 41m 55.75579s |
| Declination | –47° 23′ 17.5155″ |
| Apparent magnitude (V) | 2.30 (2.29 - 2.34) |
| Characteristics | |
| Spectral type | B1.5 III |
| U−B color index | –0.88 |
| B−V color index | –0.20 |
| Variable type | β Cep |
| Astrometry | |
| Radial velocity (Rv) | +5.4 ± 0.6 km/s |
| Proper motion (μ) | RA: −20.94 mas/yr Dec.: −23.67 mas/yr |
| Parallax (π) | 7.02 ± 0.17 mas |
| Distance | 460 ± 10 ly (142 ± 3 pc) |
| Absolute magnitude (MV) | −4.3 |
| Details | |
| Mass | 10.1 ± 1.0 M☉ |
| Luminosity | 25,000 L☉ |
| Surface gravity (log g) | 3.46 cgs |
| Temperature | 21,820 ± 2,160 K |
| Metallicity [Fe/H] | 0.04 dex |
| Rotational velocity (v sin i) | 16 km/s |
| Age | 16–20 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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