![]() 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 |