Alpha Virginis A/B

Location of Spica (circled) in the constellation Virgo
Observation data
Epoch J2000      Equinox J2000
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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Spica, which is released under the Creative Commons Attribution-Share-Alike License 3.0