Antares A/B

The position of Antares in the Scorpius constellation.
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius
Right ascension 16
Declination -26° 25′ 55″
Apparent magnitude (V) +0.96
Characteristics
Spectral type M1.5Iab-b + B2.5V
U−B color index +1.34
B−V color index +1.83
Variable type LC
Astrometry
Radial velocity (Rv) –3.4 km/s
Proper motion (μ) RA: –12.11 mas/yr
Parallax (π) 5.89 ± 1.00mas
Distance approx. 550 ly
(approx. 170 pc)
Absolute magnitude (MV) –5.28
Details
A
Mass 12.4M
Radius 883R
Luminosity 57,500L
Surface gravity (log g) 0.1
Temperature 3400 ± 200K
Rotational velocity (v sin i) 10 km/s
B
Mass 10 M
Radius 4 R
Temperature 3,500K
Other designations
α Scorpii, 21 Sco,
Database references
SIMBAD data

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Antares, which is released under the Creative Commons Attribution-Share-Alike License 3.0