Mu1 Scorpii
Mu1 Scorpii (μ1 Scorpii, abbreviated Mu1 Sco, μ1 Sco) is a binary star system in the southern zodiac constellation of Scorpius. The combined apparent visual magnitude of the pair is about magnitude 3, making it one of the brighter members of Scorpius. Based upon parallax measurements, the distance of this system from the Sun is roughly 500 light-years (150 parsecs). This system is a member of the Scorpius–Centaurus association, the nearest OB association of co-moving stars to the Sun.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| Right ascension | 16h 51m 52.23111s |
| Declination | −38° 02′ 50.5694″ |
| Apparent magnitude (V) | 2.94 - 3.22 |
| Characteristics | |
| Spectral type | B1.5 V + B6.5 V |
| U−B color index | −0.859 |
| B−V color index | −0.202 |
| Variable type | β Lyr |
| Astrometry | |
| Radial velocity (Rv) | −25 km/s |
| Proper motion (μ) | RA: −10.58 mas/yr Dec.: −22.06 mas/yr |
| Parallax (π) | 6.51 ± 0.91 mas |
| Distance | approx. 500 ly (approx. 150 pc) |
| Absolute magnitude (MV) | −2.9±0.3 |
| Orbit | |
| Period (P) | 1.44627 days |
| Semi-major axis (a) | 12.90±0.04 R☉ |
| Eccentricity (e) | 0.0 |
| Inclination (i) | 65.4±1° |
| Periastron epoch (T) | 2412374.434 HJD |
| Details | |
| μ1 Sco A | |
| Mass | 8.3±1.0 M☉ |
| Radius | 3.9±0.2 R☉ |
| Surface gravity (log g) | 4.17±0.10 cgs |
| Temperature | 24,000±1,000 K |
| Rotational velocity (v sin i) | 191.5 km/s |
| μ1 Sco B | |
| Mass | 4.6±1.0 M☉ |
| Radius | 4.6±0.3 R☉ |
| Surface gravity (log g) | 3.77±0.12 cgs |
| Temperature | 17,000±700 K |
| Rotational velocity (v sin i) | 165.0 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
The primary (Mu1 Scorpii Aa) is formally named Xamidimura /ˌkæmidiˈmʊərə/, from the Khoekhoe xami di mûra IPA: [xami ti mũːɾa] 'the (two) eyes of the lion'.
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