Spica

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Alpha Virginis A/B
Location o Spica
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Location o Spica (circled) in the constellation Virgo
Observation data
Epoch J2000      Equinox J2000
Constellation Virgo
Pronunciation /ˈspkə/
Richt ascension 13h 25m 11.5793s[1]
Declination −11° 09′ 40.759″[1]
Apparent magnitude (V) +1.04
Characteristics
Spectral type B1 III-IV/B2 V[2]
U−B colour index −0.94[3]
B−V colour index −0.24[3]
Variable type β Cep,
Rotatin ellipsoid
Astrometry
Radial velocity (Rv) +1.0[4] km/s
Proper motion (μ) RA: −42.50[1] mas/yr
Dec.: −31.73[1] mas/yr
Parallax (π) 12.44 ± 0.86[1] mas
Distance 260 ± 20 ly
(80 ± 6 pc)
Absolute magnitude (MV) −3.55 (−3.5/−1.5)[5]
Orbit[6]
Period (P) 4.0145898 d
Eccentricity (e) 0.067 ± 0.014
Inclination (i) 54 ± 6°
Periastron epoch (T) 2440678.09
Argument o periastron (ω)
(secondary)
140 ± 10°
Details
Primary
Mass 10.25 ± 0.68[6] M
Radius 7.40 ± 0.57[6] R
Luminosity 12,100[7] L
Surface gravity (log g) 3.7 ± 0.1[5]
Temperatur 22,400[5] K
Rotational velocity (v sin i) 199 ± 5[6] km/s
Seicontary
Mass 6.97 ± 0.4[6] M
Radius 3.64 ± 0.28[6] R
Luminosity 1,500[7] L
Temperatur 18,500[7] K
Rotational velocity (v sin i) 87 ± 6[6] km/s
Ither 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.[8]

Spica (α Vir, α Virginis, Alpha Virginis, pronoonced /ˈspaɪkə/) is the brichtest starn in the constellation Virgo, an the 15t brightest starn in the nicht sky. It is a blue giant an a variable starn o the Beta Cephei type locatit 260 licht years frae Yird.

References[eedit | eedit soorce]

  1. 1.0 1.1 1.2 1.3 1.4 Perryman, M. A. C.; Lindegren; Kovalevsky; Hoeg; Bastian; Bernacca; Crézé; Donati; Grenon; et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics 323: L49–L52. Bibcode:1997A&A...323L..49P. 
  2. Schnerr, R. S.; et al. (June 2008). "Magnetic field measurements and wind-line variability of OB-type stars". Astronomy and Astrophysics 483 (3): 857–867. arXiv:1008.4260. Bibcode:2008A&A...483..857S. doi:10.1051/0004-6361:20077740. Retrieved 2010-04-16. 
  3. 3.0 3.1 Pfleiderer, J.; Mayer, U. (October 1971). "Near-ultraviolet surface photometry of the southern Milky Way". Astronomical Journal 76: 691. Bibcode:1971AJ.....76..691P. doi:10.1086/111186. 
  4. Wilson, Ralph Elmer (1953). General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. Bibcode:1953QB901.W495..... 
  5. 5.0 5.1 5.2 Herbison-Evans, D.; Hanbury Brown, R.; Davis, J.; Allen, L. R.; Hanbury Brown; Davis; Allen (1971). "A study of alpha Virginis with an intensity interferometer". Monthly Notices of the Royal Astronomical Society 151: 161−176. Bibcode:1971MNRAS.151..161H. 
  6. 6.0 6.1 6.2 6.3 6.4 6.5 6.6 Harrington, David; Koenigsberger, Gloria; Moreno, Edmundo; Kuhn, Jeffrey (October 2009). "Line-profile Variability from Tidal Flows in Alpha Virginis (Spica)". The Astrophysical Journal 704 (1): 813–830. arXiv:0908.3336. Bibcode:2009ApJ...704..813H. doi:10.1088/0004-637X/704/1/813. 
  7. 7.0 7.1 7.2 Kaler, Jim. "Spica". Stars. Retrieved 2010-04-15. 
  8. "V* alf Vir -- Variable Star of beta Cep type". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-04-13.