Spica
| 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 |
| Jarak | 260 ± 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 | |
| Massa | 10.25 ± 0.68[6] M☉ |
| Radius | 7.40 ± 0.57[6] R☉ |
| Luminositas | 12,100[7] L☉ |
| Gravitasi permukaan (log g) | 3.7 ± 0.1[5] |
| Suhu | 22,400[5] K |
| Kecepatan rotasi (v sin i) | 199 ± 5[6] km/s |
| Secondary | |
| Massa | 6.97 ± 0.4[6] M☉ |
| Radius | 3.64 ± 0.28[6] R☉ |
| Luminositas | 1,500[7] L☉ |
| Suhu | 18,500[7] K |
| Kecepatan rotasi (v sin i) | 87 ± 6[6] km/s |
| Penamaan lain | |
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 2 3 4 5 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. ;
- ↑ 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]
- 1 2 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. Pemeliharaan CS1: Banyak nama: authors list (link)
- ↑ Wilson, Ralph Elmer (1953). General Catalogue of Stellar Radial Velocities. Washington: Carnegie Institution of Washington. Bibcode:1953QB901.W495.....
- 1 2 3 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. Pemeliharaan CS1: Banyak nama: authors list (link)
- 1 2 3 4 5 6 7 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. Pemeliharaan CS1: Banyak nama: authors list (link)
- 1 2 3 Kaler, Jim. "Spica". Stars. Diakses tanggal 2010-04-15.
- ↑ "V* alf Vir -- Variable Star of beta Cep type". SIMBAD. Centre de Données astronomiques de Strasbourg. Diakses tanggal 2010-04-13.
- Evans, James (1998). The History and Practice of Ancient Astronomy. Oxford University Press. hlm. 259. ISBN 0195095391.
- Allen, Richard Hinckley (2003). Star Names and Their Meanings. Kessinger Publishing. hlm. 468. ISBN 0766140288.
- Rufus, W. Carl (1943). "Copernicus, Polish Astronomer, 1473–1543". Journal of the Royal Astronomical Society of Canada. 37 (4): 134. Bibcode:1943JRASC..37..129R.
- Moesgaard, Kristian P. (1973). "Copernican influence on Tycho Brahe". 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. ;
- Breit, Derek C. (March 12, 2010). "Diary of Astronomical Phenomena 2010". Poyntsource.com. Diakses tanggal 2010-04-13.
- 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. Pemeliharaan CS1: Banyak nama: authors list (link)
- 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.
- Morris, S. L. (1985). "The ellipsoidal variable stars". Astrophysical Journal, Part 1. 295: 143–152. Bibcode:1985ApJ...295..143M. doi:10.1086/163359.
- 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. Pemeliharaan CS1: Banyak nama: authors list (link)