{"id":4662,"date":"2016-01-08T05:57:14","date_gmt":"2016-01-08T05:57:14","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=4662"},"modified":"2016-02-24T07:06:48","modified_gmt":"2016-02-24T07:06:48","slug":"jupiter-sera-plus-pres-de-terre-deux-mois","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/01\/08\/jupiter-sera-plus-pres-de-terre-deux-mois\/","title":{"rendered":"Jupiter sera au plus pr\u00e8s de la Terre dans deux mois"},"content":{"rendered":"

Les astronomes ont d\u00e9j\u00e0 commenc\u00e9 \u00e0 tirer le portrait de Jupiter sans attendre le 8 mars, date de la prochaine opposition de la plan\u00e8te gazeuse g\u00e9ante.<\/strong><\/p>\n

Le 8 mars prochain Jupiter <\/a>sera en opposition, la meilleure p\u00e9riode pour l’observer puisque la plan\u00e8te gazeuse g\u00e9ante sera \u00e0 l’oppos\u00e9 du Soleil <\/a>par rapport \u00e0 nous (elle se l\u00e8vera quand notre \u00e9toile se couchera).<\/p>\n

Jupiter<\/a>, observable toute la nuit dans la constellation du Lion, sera \u00e9galement \u00e0 sa plus courte distance de la Terre, 664 millions de km, soit un diam\u00e8tre apparent de 44,4 sec d\u2019arc. La pr\u00e9c\u00e9dente opposition de Jupiter <\/a>avait eu lieu le 6 f\u00e9vrier 2015 avec un diam\u00e8tre apparent de 45,3″.<\/p>\n

\"jup2\"<\/a><\/p>\n

L’image ci-dessus, particuli\u00e8rement d\u00e9taill\u00e9e, a \u00e9t\u00e9 obtenue le 2 janvier par Efrain Morales Rivera<\/a> depuis Aguadilla, sur l\u2019\u00eele de Porto Rico. Il y a un an cet astronome amateur avait d\u00e9j\u00e0 photographi\u00e9 un incroyable triple transit de satellites devant Jupiter<\/a>.<\/p>\n

Cette photographie permet d’admirer les diff\u00e9rentes bandes gazeuses qui ceinturent la plan\u00e8te. Ces bandes, parcourues par des vents violents qui peuvent atteindre 600 km\/h, n’ont pas toutes la m\u00eame teinte.<\/p>\n

Ces diff\u00e9rences de couleurs s’expliquent par l’altitude et la composition chimique des nuages : on trouve dans l\u2019atmosph\u00e8re de la plan\u00e8te de l’hydrog\u00e8ne (90%) et de l’h\u00e9lium (10%) avec des traces d\u2019ammoniac, de m\u00e9thane et de vapeur d\u2019eau. La combinaison de ces gaz soumis au rayonnement solaire produit diff\u00e9rents compos\u00e9s responsables des variations de couleurs. L\u2019hydrog\u00e9nosulfure d\u2019ammonium par exemple, un m\u00e9lange de sulfure d’hydrog\u00e8ne et d’ammoniac, est \u00e0 l’origine de la couleur ocre des nuages.<\/p>\n

On note \u00e9galement sur cette image la pr\u00e9sence de la Grande Tache Rouge qui fut d\u00e9couverte en 1665 par Jean-Dominique Cassini, l’astronome \u00e0 qui Louis XIV confia la direction de l’Observatoire de Paris 6 ans plus tard. Cette tache orang\u00e9e qui fait trois fois la taille de la Terre est un anticyclone situ\u00e9 aux latitudes tropicales de l\u2019h\u00e9misph\u00e8re austral de Jupiter.<\/p>\n","protected":false},"excerpt":{"rendered":"

Les astronomes ont d\u00e9j\u00e0 commenc\u00e9 \u00e0 tirer le portrait de Jupiter sans attendre le 8 mars, date de la prochaine opposition de la plan\u00e8te gazeuse g\u00e9ante. Le 8 mars prochain Jupiter sera en opposition, la meilleure p\u00e9riode pour l’observer puisque la plan\u00e8te gazeuse g\u00e9ante sera \u00e0 l’oppos\u00e9 du Soleil par rapport \u00e0 nous (elle se … Continuer la lecture de Jupiter sera au plus pr\u00e8s de la Terre dans deux mois<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":4663,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[372,790,1442,90,190],"class_list":["post-4662","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-constellation-du-lion","tag-efrain-morales-rivera","tag-grande-tache-rouge","tag-jupiter","tag-opposition"],"yoast_head":"\nJupiter sera au plus pr\u00e8s de la Terre dans deux mois<\/title>\n<meta name=\"description\" content=\"Les astronomes ont d\u00e9j\u00e0 commenc\u00e9 \u00e0 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