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Bianca (satélite)

 Nota: Para o asteroide, veja 218 Bianca.
Bianca
Satélite Urano VIII
Bianca está dentro do círculo.
Características orbitais[1]
Semieixo maior 59165,550 ± 0,045 km
Excentricidade 0,00092 ± 0,000118
Período orbital 0,434578986 ± 0,000000022 d
Velocidade orbital média 9,90 km/s
Inclinação 0,19308 ± 0,05° (com
equador de Urano) °
Características físicas
Dimensões 64 × 46 × 46 km[2]
Diâmetro médio 51,4 ± 4 km[2]
Área da superfície ~8 300 km²
Volume ~71 000 km³
Massa ~9,2 × 1016 kg
Densidade média ~1,3[3] g/cm³
Gravidade superficial ~0,0086 m/s2
Período de rotação rotação sincronizada[2]
Velocidade de escape ~0,022 km/s
Inclinação axial zero[2]
Albedo 0,08 ± 0,01[4]
0,065 ± 0,010[3]
0,07[5]
Temperatura média: ~64 K / -209 ºC
Magnitude aparente 22,52 ± 0,24[3]

Bianca é um satélite natural interno de Urano. Foi descoberto com imagens tiradas pela sonda Voyager 2 em 23 de janeiro de 1986 e recebeu a designação provisória de S/1986 U 9.[6] Bianca recebeu o nome da irmã de Katherine da obra de Shakespeare The Taming of the Shrew. Bianca também é chamada de Urano VIII.[7]

Pouco se sabe sobre Bianca além de sua órbita,[1] diâmetro médio de 51,4 km[2] e albedo geométrico de 0,08.[4] Nas imagens da Voyager 2 Bianca aparece como um objeto alongado com seu eixo maior apontando em direção a Urano. A razão dos eixos de Bianca é de 0,7 ± 0,2.[2] Sua superfície tem coloração cinza.[2]

Bianca pertence ao grupo de satélites Pórcia, o qual também inclui Créssida, Desdémona, Julieta, Pórcia, Rosalinda, Cupido, Belinda e Perdita.[4] Esses satélites possuem órbitas e propriedades fotométricas similares.[4]

Referências

  1. a b Jacobson, R. A (março de 1998). «The Orbits of the Inner Uranian Satellites from Hubble Space Telescope and Voyager 2 Observations». The Astronomical Journal. 115 (3). pp. 1195–1199. Bibcode:1998AJ....115.1195J. doi:10.1086/300263 
  2. a b c d e f g Karkoschka, Erich (maio de 2001). «Voyager's Eleventh Discovery of a Satellite of Uranus and Photometry and the First Size Measurements of Nine Satellite». Icarus. 151 (1). pp. 69–77. Bibcode:2001Icar..151...69K. doi:10.1006/icar.2001.6597 
  3. a b c «Planetary Satellite Physical Parameters». JPL (Solar System Dynamics). 19 de fevereiro de 2015. Consultado em 18 de novembro de 2015 
  4. a b c d Karkoschka, Erich (maio de 2001). «Comprehensive Photometry of the Rings and 16 Satellites of Uranus with the Hubble Space Telescope». Icarus. 151 (1). pp. 51–68. Bibcode:2001Icar..151...51K. doi:10.1006/icar.2001.6596 
  5. Williams, Dr. David R (13 de outubro de 2015). «Uranian Satellite Fact Sheet». NASA (National Space Science Data Center). Consultado em 18 de novembro de 2015 
  6. Smith, B. A (27 de janeiro de 1986). «IAU Circular No. 4168». Consultado em 18 de novembro de 2015 
  7. «Planet and Satellite Names and Discoverers». Gazetteer of Planetary Nomenclature. USGS Astrogeology. Consultado em 18 de novembro de 2015 

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