{"id":2943,"date":"2015-06-08T04:59:54","date_gmt":"2015-06-08T04:59:54","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=2943"},"modified":"2015-06-14T12:33:50","modified_gmt":"2015-06-14T12:33:50","slug":"hyperion-lun-des-satellites-de-saturne-en-gros-plan","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/06\/08\/hyperion-lun-des-satellites-de-saturne-en-gros-plan\/","title":{"rendered":"Hyp\u00e9rion, l’un des satellites de Saturne, en gros plan"},"content":{"rendered":"

Comme beaucoup de satellites de Saturne, Hyp\u00e9rion pr\u00e9sente d’\u00e9tonnantes caract\u00e9ristiques. Il a \u00e9t\u00e9 de nouveau survol\u00e9 de pr\u00e8s par la sonde Cassini. <\/strong><\/p>\n

La sonde Cassini <\/a>explore Saturne <\/a>et ses lunes depuis 2004, une aventure qu’aime \u00e9voquer l’astrophysicien Andr\u00e9 Brahic<\/a>. Quand l’orbiteur n’est pas en train de traquer les aurores polaires<\/a> ou de scruter les anneaux<\/a>, il se tourne vers les satellites de la sixi\u00e8me plan\u00e8te du Syst\u00e8me solaire pour leur tirer le portrait. Et on n’est jamais d\u00e9\u00e7u\u00a0!<\/p>\n

\"hyperion_saturne\"<\/a><\/p>\n

Japet<\/a>, le satellite noir et blanc, Titan <\/a>et ses \u00eeles myst\u00e9rieuses, ou encore Mimas et Rh\u00e9a<\/a> ont d\u00e9j\u00e0 re\u00e7u la visite de la sonde, qui s’est approch\u00e9e d’Hyp\u00e9rion le 29 mai dernier apr\u00e8s un premier survol en septembre 2005.<\/p>\n

Hyp\u00e9rion a \u00e9t\u00e9 d\u00e9couvert en 1848 par les astronomes Bond (p\u00e8re et fils) et Lassell. Ses dimensions sont approximativement de 370 \u00d7 280 \u00d7 230 km et sa surface fait penser \u00e0 celle d’une \u00e9ponge\u00a0: la glace d’eau ne repr\u00e9sente que 60 % du volume du satellite, le reste \u00e9tant du vide. Hyp\u00e9rion est peut-\u00eatre une ancienne com\u00e8te <\/a>qui a \u00e9t\u00e9 retenue dans le champ gravitationnel de Saturne.<\/p>\n

Apr\u00e8s ce passage \u00e0 pr\u00e8s de 30 000 km, Cassini a poursuivi son chemin\u00a0: Dion\u00e9 et Encelade sont les prochains satellites qui recevront sa visite.<\/p>\n","protected":false},"excerpt":{"rendered":"

Comme beaucoup de satellites de Saturne, Hyp\u00e9rion pr\u00e9sente d’\u00e9tonnantes caract\u00e9ristiques. Il a \u00e9t\u00e9 de nouveau survol\u00e9 de pr\u00e8s par la sonde Cassini. La sonde Cassini explore Saturne et ses lunes depuis 2004, une aventure qu’aime \u00e9voquer l’astrophysicien Andr\u00e9 Brahic. Quand l’orbiteur n’est pas en train de traquer les aurores polaires ou de scruter les anneaux, … Continuer la lecture de Hyp\u00e9rion, l’un des satellites de Saturne, en gros plan<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":2944,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[639,622,1045,1074,1017,570,136,567],"class_list":["post-2943","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-andre-brahic","tag-anneau","tag-aurore","tag-hyperion","tag-japet","tag-mission-cassini-huygens","tag-saturne","tag-titan"],"yoast_head":"\nHyp\u00e9rion, l'un des satellites de Saturne, en gros plan<\/title>\n<meta name=\"description\" content=\"Comme beaucoup de satellites de Saturne, Hyp\u00e9rion pr\u00e9sente d'\u00e9tonnantes caract\u00e9ristiques. 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