Spica

Alpha Virginis A/B

Atas : Lokasi Spica (sebelah kiri bawah tengah) Bawah : Spica dan Mars saat berkonjungsi
Data pengamatan
Epos J2000      Ekuinoks J2000
Rasi bintang Virgo
Pengucapan [ˈspaɪkə]
Asensio rekta  13j 25m 11.5793d[1]
Deklinasi  −11° 09′ 40.759″[1]
Magnitudo tampak (V) +1.04
Ciri-ciri
Kelas spektrum B1 III-IV/B2 V[2]
Indeks warna U−B −0.94[3]
Indeks warna B−V −0.24[3]
Jenis variabel β Cep,
Rotating ellipsoid
Astrometri
Kecepatan radial (Rv)+1.0[4] km/s
Gerak diri (μ) RA: −42.50[1] mdb/thn
Dek.: −31.73[1] mdb/thn
Paralaks (π)12,44±0,86[1] mdb
Jarak260 ± 20 tc
(80 ± 6 pc)
Magnitudo mutlak (MV)−3.55 (−3.5/−1.5)[5]
Orbit[6]
Periode (P)4.0145898 d
Eksentrisitas (e)0.067 ± 0.014
Inklinasi (i)54 ± 6°
Epos apsis (T)2440678.09
Argumen periapsis (ω)
(sekunder)		140 ± 10°
Detail
Primary
Massa10.25 ± 0.68[6] M☉
Radius7.40 ± 0.57[6] R☉
Luminositas12,100[7] L☉
Gravitasi permukaan (log g)3.7 ± 0.1[5]
Suhu22,400[5] K
Kecepatan rotasi (v sin i)199 ± 5[6] km/s
Secondary
Massa6.97 ± 0.4[6] M☉
Radius3.64 ± 0.28[6] R☉
Luminositas1,500[7] L☉
Suhu18,500[7] K
Kecepatan rotasi (v sin i)87 ± 6[6] km/s
Penamaan lain
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) adalah bintang yang paling terang pada rasi bintang Virgo, dan bintang terterang ke-15 yang terlihat pada malam hari. Bintang ini memiliki jarak sekitar 260 tahun cahaya dari Bumi. Bintang ini juga dikenal sebagai raksasa biru, dan merupakan Bintang variabel dari Tipe Beta Cephei

Spica merupakan bintang yang paling panas dan umumnya berwarna biru.

Rujukan

  1. ^ Gies, Douglas R.; Bagnuolo, William G., Jr.; Penny, Laura R.; Bagnuolo (1997). "Photospheric Heating in Colliding-Wind Binaries". Astrophysical Journal. 479: 408. Bibcode:1997ApJ...479..408G. doi:10.1086/303848. 
  2. ^ Allen, Richard Hinckley (2003). Star Names and Their Meanings. Kessinger Publishing. hlm. 468. ISBN 0766140288. 
  3. ^ Morris, S. L. (1985). "The ellipsoidal variable stars". Astrophysical Journal, Part 1. 295: 143–152. Bibcode:1985ApJ...295..143M. doi:10.1086/163359. 
  4. ^ Beech, M. (1986). "The ellipsoidal variables. III - Circularization and synchronization". Astrophysics and Space Science. 125 (1): 69–75. Bibcode:1986Ap&SS.125...69B. doi:10.1007/BF00643972. 
  5. ^ Riddle, R. L.; Bagnuolo, W. G.; Gies, D. R.; Bagnuolo; Gies (2001). "Spectroscopy of the temporal variations of α Vir". Bulletin of the American Astronomical Society. 33: 1312. Bibcode:2001AAS...199.0613R. 
  6. ^ Breit, Derek C. (March 12, 2010). "Diary of Astronomical Phenomena 2010". Poyntsource.com. Diakses tanggal 2010-04-13. 
  7. ^ Moesgaard, Kristian P. (1973). "Copernican influence on Tycho Brahe". Dalam Jerzy Dobrzycki. The reception of Copernicus' heliocentric theory: proceedings of a symposium organized by the Nicolas Copernicus Committee of the International Union of the History and Philosophy of Science. Toruń, Poland: Studia Copernicana, Springer. ISBN 9027703116. 
  8. ^ Rufus, W. Carl (1943). "Copernicus, Polish Astronomer, 1473–1543". Journal of the Royal Astronomical Society of Canada. 37 (4): 134. Bibcode:1943JRASC..37..129R. 
  9. ^ Evans, James (1998). The History and Practice of Ancient Astronomy. Oxford University Press. hlm. 259. ISBN 0195095391. 
  10. ^ a b c d e Perryman, M. A. C.; Lindegren; Kovalevsky; Hoeg; Bastian; Bernacca; Crézé; Donati; Grenon (1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics. 323: L49–L52. Bibcode:1997A&A...323L..49P. 
  11. ^ Schnerr, R. S. (2008). "Magnetic field measurements and wind-line variability of OB-type stars" (PDF). Astronomy and Astrophysics. 483 (3): 857–867. Bibcode:2008A&A...483..857S. doi:10.1051/0004-6361:20077740. Diakses tanggal 2010-04-16.  [pranala nonaktif permanen]
  12. ^ a b Pfleiderer, J.; Mayer, U. (1971). "Near-ultraviolet surface photometry of the southern Milky Way". Astronomical Journal. 76: 691. Bibcode:1971AJ.....76..691P. doi:10.1086/111186. 
  13. ^ Wilson, Ralph Elmer (1953). General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. Bibcode:1953QB901.W495..... 
  14. ^ a b c 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. 
  15. ^ a b c d e f g Harrington, David; Koenigsberger, Gloria; Moreno, Edmundo; Kuhn, Jeffrey (2009). "Line-profile Variability from Tidal Flows in Alpha Virginis (Spica)". The Astrophysical Journal. 704 (1): 813–830. Bibcode:2009ApJ...704..813H. doi:10.1088/0004-637X/704/1/813. 
  16. ^ a b c Kaler, Jim. "Spica". Stars. Diakses tanggal 2010-04-15. 
  17. ^ "V* alf Vir -- Variable Star of beta Cep type". SIMBAD. Centre de Données astronomiques de Strasbourg. Diakses tanggal 2010-04-13. 

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