![]() ![]() Location of Spica (circled) in the constellation Virgo |
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Observation data Epoch J2000 Equinox J2000 |
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Constellation | Virgo |
Pronunciation | /ˈspaɪkə/ |
Right ascension | 13 |
Declination | −11° 09′ 40.759″ |
Apparent magnitude (V) | +1.04 |
Characteristics | |
Spectral type | B1 III-IV/B2 V |
U−B color index | −0.94 |
B−V color index | −0.24 |
Variable type | β Cep, Rotating ellipsoid |
Astrometry | |
Radial velocity (Rv) | +1.0 km/s |
Proper motion (μ) | RA: −42.50 mas/yr |
Parallax (π) | 12.44 ± 0.86mas |
Distance | 260 ± 20 ly (80 ± 6 pc) |
Absolute magnitude (MV) | −3.55 (−3.5/−1.5) |
Orbit | |
Period (P) | 4.0145898 d |
Eccentricity (e) | 0.067 ± 0.014 |
Inclination (i) | 54 ± 6° |
Periastron epoch (T) | 2440678.09 |
Argument of periastron (ω) (secondary) |
140 ± 10° |
Details | |
Primary | |
Mass | 10.25 ± 0.68M☉ |
Radius | 7.40 ± 0.57R☉ |
Luminosity | 12,100L☉ |
Surface gravity (log g) | 3.7 ± 0.1 |
Temperature | 22,400K |
Rotational velocity (v sin i) | 199 ± 5 km/s |
Secondary | |
Mass | 6.97 ± 0.4M☉ |
Radius | 3.64 ± 0.28R☉ |
Luminosity | 1,500L☉ |
Temperature | 18,500K |
Rotational velocity (v sin i) | 87 ± 6 km/s |
Other designations | |
Spica, Azimech, 角宿一, Spica Virginis, Alaraph, Dana, α Virginis, 67 Virginis, HR 5056, BD -10°3672, HD 116658, GCTP 18144, FK5 498, CCDM 13252-1109, SAO 157923, HIP 65474.
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