Mu2 Scorpii
Mu2 Scorpii (μ2 Scorpii, abbreviated Mu2 Sco, μ2 Sco), also named Pipirima /pɪˈpɪrɪmə/, is a star in the zodiac constellation of Scorpius. It has an apparent visual magnitude of +3.56, which is bright enough to be seen with the naked eye. Its distance from the Sun is about 474 light-years, as determined by parallax measurements. It is a member of the Upper Centaurus–Lupus subgroup of the Scorpius–Centaurus association.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16h 52m 20.14532s |
| Declination | −38° 01′ 03.1258″ |
| Apparent magnitude (V) | +3.56 |
| Characteristics | |
| Spectral type | B2 IV |
| U−B color index | −0.878 |
| B−V color index | −0.219 |
| Astrometry | |
| Radial velocity (Rv) | +1.4 km/s |
| Proper motion (μ) | RA: −11.09 mas/yr Dec.: −23.32 mas/yr |
| Parallax (π) | 6.88 ± 0.12 mas |
| Distance | 474 ± 8 ly (145 ± 3 pc) |
| Absolute magnitude (MV) | −2.25 |
| Details | |
| Mass | 8.7±0.2 M☉ |
| Radius | 7.0 R☉ |
| Luminosity | 2,385 L☉ |
| Temperature | 23,113 K |
| Rotational velocity (v sin i) | 58 km/s |
| Age | 18.5±3.2 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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