Tarvos (lúa)

Tarvos
Descubrimento[1]
Descuberta por B. J. Gladman, J. J. Kavelaars,
R. L. Allen, T. Rigg,
C. W. Hergenrother, S. M. Larson,
A. Doressoundiram e J. Romon[2][3]
Descuberta no 23 de setembro do 2000
Designación alternativa Saturno XXI
Características orbitais[4]
Época 2000 Feb. 26.00
Eixo semi-maior 17,983 Gm
Excentricidade 0,5305[4]
Período orbital 926.2 d
(2,63 a)
Inclinación 33,825° *
Características físicas
Diámetro medio 15 km **[5]
Período de rotación ?
Albedo 0,04[5] asumido
Cor vermello claro (variable)
B-V=0,77 R-V=0,57[6]
Tipo espectral ?
*respecto da eclíptica **baseado no albedo

Tarvos , ou tamén coñecido coma Saturno XXI, é un satélite irregular de movemento directo de Saturno. Foi descuberto por John J. Kavelaars, e o seu equipo o 23 de setembro do 2000 e recibiu a designación temporal de S/2000 S 4. O nome oficial outorgóuselle en agosto do 2003, Tarvos era unha deidade da mitoloxía gala vista coma un touro que portaba tres grúas ó longo do seu lombo.[7]

Tarvos orbita Saturno a unha distancia media de 18 millóns de km en 926 días e ten un diámetro aproximado de 15 km (asumindo un albedo do 0,04). Ten a órbita máis excéntrica entre os satélites de Saturno.[4]

Membro do grupo de satélites irregulares Gallic, que amosan características orbitais semellantes así coma unha cor vermella clara, pensase que é posible que Tarvos nacese da fragmentación do corpo proxenitor do grupo[6][8] ou que sexa un fragmento de Albiorix[9].

Notas

  1. ↑ Discovery Circumstances from JPL
  2. ↑ IAUC 7513: S/2000 S 3 and S/2000 S 4 Arquivado 16 de setembro de 2002 en Wayback Machine. 25 de outubro do 2000 (descubrimento)
  3. ↑ MPEC 2000-Y14: S/2000 S 3, S/2000 S 4, S/2000 S 5, S/2000 S 6, S/2000 S 10 19 de decembro do 2000 (descubrimento é efemérides)
  4. ↑ 4,0 4,1 4,2 Jacobson, R.A. (2007) SAT270, SAT271 (28-06-2007). JPL/NASA, ed. "Planetary Satellite Mean Orbital Parameters". Consultado o 19-01-2008. 
  5. ↑ 5,0 5,1 Scott Sheppard. Department of Terrestrial Magnetism, ed. "Saturn's Known Satellites". Arquivado dende o orixinal o 15-05-2011. Consultado o 06-03-2007. 
  6. ↑ 6,0 6,1 Grav, T.; Holman, M. J.; Gladman, B. J.; Aksnes, K.; Photometric survey of the irregular satellites, Icarus, 166 (2003), pp. 33-45
  7. ↑ IAUC 8177: Satellites of Jupiter, Saturn, Uranus Arquivado 09 de xullo de 2008 en Wayback Machine. 8 de agosto do 2003 (bautizando a lúa)
  8. ↑ Gladman, B. J.; Nicholson, P. D.; Burns, J. A.; Kavelaars, J. J.; Marsden, B. G.; Holman, M. J.; Grav, T.; Hergenrother, C. W.; Petit, J.-M.; Jacobson, R. A.; e Gray, W. J.; Discovery of 12 satellites of Saturn exhibiting orbital clustering, Nature, 412 (12 de xullo do 2001), pp. 163–166
  9. ↑ Grav, T.; and Bauer, J.; A deeper look at the colors of Saturnian irregular satellites

Véxase tamén

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