Download - 2.3 Luas Asteróides e Cometas
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AGA0100
3.8 Luas e anéis
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A Lua satélite da Terra
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Luas de Marte NASA: Mars Reconaissance Orbiter
Fobos (2008) Deimos (2009)
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Luas de Júpiter: 67
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Io (Júpiter I)
(NASA: Voyager 1-1979
Voyager 2 e Galileo-1999)
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Europa Júpiter II
(NASA: Galileo, 1998)
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Ganimedes (Júpiter III)
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Calisto
Júpiter IV
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Luas de Saturno: 62
Titan (VI) e Encélado (II)
(NASA: Cassini)
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Titan: vulcões de gelo (criovulcanismo)
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Encélado D = 500 km
(Herschel, 28/8/1789)
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Encélado (NASA: Cassini)
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Encélado e o anel E de Saturno
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Confirmação do lago no polo sul de Encélado (Science 4/4/2014)
Modelo
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Nave Cassini:
Mimas e Febe
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Dione (Saturno IV)
(NASA-Cassini)
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Iapetus (Saturno VIII)
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Ephimeteus
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Urano (total de 28): Puck, Miranda, Ariel, Umbriel, Titânia e Oberon
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Voyager 2:
Miranda e Oberon (Urano)
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Voyager 2: Ariel e Ubriel (Urano)
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Netuno (14)
Tritão, a maior lua de
Netuno (Voyager 2, 1989)
tem Gêiseres
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O número de luas
• Mercúrio 0
• Vênus 0
• Terra 1
• Marte 2
• Júpiter 67
• Saturno 62
• Urano 28
• Netuno 14
O número de luas depende da massa do planeta e de sua distância ao
Sol.
Formação: Acidentais nos planetas rochosos; discos primordiais nos
planetas gasosos.
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Atividade “geológica” em ação
• Terra: vulcões, terremotos, deriva continental
• Vênus: 3 vulcões ativos confirmados em 2010
• Mercúrio, Marte, Lua, Ganimedes, Tétis e Miranda: não
há evidência de atividade atual; vulcões fósseis.
• Io: vulcões de enxofre; o mais ativo do sistema solar.
• Atividade tectônica e criovulcanismo: Europa e Titan,
além de Encélado e Triton, com gêiseres .
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Água e chuva
• Água (em estado líquido) abaixo da superfície
(sob camada de gelo): Oceanos em Europa,
Ganimedes, Calisto, Titan ; lago em Encélado.
• Ceres: vapor de água do quê?
• Titan: chuva de metano e lagos de
hidrocarbonetos.
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Anéis:
Saturno (HST)
Júpiter (Cassini)
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Voyager 2: Urano
e Netuno
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O centauro Chariklo tem dois anéis (É o maior Centauro, com 260 km)
Descoberto o primeiro par de anéis em torno de um asteroide
(Centauro) por Felipe Braga-Ribas (Observatório Nacional) e outros
60 autores, sendo 11 brasileiros (publicado na revista Nature em
26/3/2014). Os anéis se chamam Oiapoque e Chui.
Concepção artística
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Os anéis de Chariklo
ocultação de estrela