Mu1 Scorpii

For other stars with this Bayer designation, see μ Scorpii.
μ1 Scorpii
Location of μ1 Scorpii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius
Right ascension 16h 51m 52.23111s[1]
Declination −38° 02′ 50.5694″[1]
Apparent magnitude (V) 2.94 - 3.22[2]
Characteristics
Spectral type B1.5 V + B6.5 V[3]
U−B color index −0.859[4]
B−V color index −0.202[4]
Variable type β Lyr[2]
Astrometry
Radial velocity (Rv)−25[5] km/s
Proper motion (μ) RA: −10.58[1] mas/yr
Dec.: −22.06[1] mas/yr
Parallax (π)6.51 ± 0.91 mas[1]
Distanceapprox. 500 ly
(approx. 150 pc)
Absolute magnitude (MV)−2.9±0.3[3]
Orbit[3]
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[6]
μ1 Sco A
Mass8.3±1.0 M☉
Radius3.9±0.2 R☉
Surface gravity (log g)4.17±0.10 cgs
Temperature24,000±1,000 K
Rotational velocity (v sin i)191.5 km/s
μ1 Sco B
Mass4.6±1.0 M☉
Radius4.6±0.3 R☉
Surface gravity (log g)3.77±0.12 cgs
Temperature17,000±700 K
Rotational velocity (v sin i)165.0 km/s
Other designations
Xamidimura, CD−37°11033, FK5 1439, HD 151890, HIP 82514, HR 6247, SAO 208102, WDS 16519-3803
Database references
SIMBADdata

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).[1] This system is a member of the Scorpius–Centaurus association, the nearest OB association of co-moving stars to the Sun.[3]

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'.[7]

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