{"id":8305,"date":"2017-10-08T07:58:50","date_gmt":"2017-10-08T07:58:50","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=8305"},"modified":"2017-10-27T09:27:45","modified_gmt":"2017-10-27T09:27:45","slug":"sonde-juno-photographie-ensemble-jupiter-io-europe","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/10\/08\/sonde-juno-photographie-ensemble-jupiter-io-europe\/","title":{"rendered":"La sonde Juno photographie ensemble Jupiter, Io et Europe"},"content":{"rendered":"<p><strong>Au cours de sa huiti\u00e8me orbite autour de Jupiter, la sonde Juno a immortalis\u00e9 la plan\u00e8te gazeuse g\u00e9ante et deux de ses satellites, Io et Europe.\u00a0<\/strong><\/p>\n<p>Depuis leur d\u00e9couverte il y a un peu plus de quatre si\u00e8cles par le grand savant italien <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/01\/06\/galilee-le-savant-qui-a-ouvert-nos-yeux-sur-lunivers\/\" target=\"_blank\" rel=\"noopener\">Galil\u00e9e<\/a>\u00a0\u00e0 l&#8217;aide d&#8217;une modeste <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/05\/bien-choisir-sa-premiere-lunette-astronomique\/\" target=\"_blank\" rel=\"noopener\">lunette astronomique<\/a>, les quatre principaux satellites de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/08\/26\/25-aout-jupiter-avait-rendez-croissant-de-lune\/\" target=\"_blank\" rel=\"noopener\">Jupiter<\/a> (Io, Europe, Ganym\u00e8de et Callisto) fascinent les scientifiques tout autant que la plan\u00e8te g\u00e9ante gazeuse. La cam\u00e9ra de la sonde Juno a captur\u00e9 l&#8217;image des deux satellites les plus proches de Jupiter, Io et Europe.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/10\/juno.jpg\" rel=\"lightbox[8305]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-8306\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/10\/juno-450x284.jpg\" alt=\"\" width=\"450\" height=\"284\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/10\/juno-450x284.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/10\/juno-768x485.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/10\/juno-1024x647.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/10\/juno.jpg 1424w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>La sonde am\u00e9ricaine se trouve dans la banlieue de Jupiter depuis l&#8217;\u00e9t\u00e9 2016 et son programme d&#8217;observation pr\u00e9voit la r\u00e9alisation d&#8217;une trentaine d&#8217;orbites elliptiques jusqu&#8217;en f\u00e9vrier 2018.<!--more--><\/p>\n<p>Cette <a href=\"https:\/\/www.jpl.nasa.gov\/spaceimages\/details.php?id=PIA21968\" target=\"_blank\" rel=\"noopener\">image<\/a> a \u00e9t\u00e9 acquise le premier septembre au cours de sa huiti\u00e8me orbite par la cam\u00e9ra <a href=\"https:\/\/www.missionjuno.swri.edu\/junocam\" target=\"_blank\" rel=\"noopener\">JunoCam<\/a> alors que la sonde se trouvait \u00e0 un peu plus de 27.000 kilom\u00e8tres du sommet des nuages de Jupiter. L\u00e9g\u00e8rement \u00e0 gauche on d\u00e9couvre Io (\u00e0 481.000 km de la sonde) : premier satellite en partant de Jupiter, Io (d\u00e9form\u00e9 par les forces de mar\u00e9e engendr\u00e9es par la plan\u00e8te gazeuse g\u00e9ante) compte plus de 400 volcans en activit\u00e9 qui remod\u00e8lent en permanence sa surface.<\/p>\n<p>Beaucoup plus loin (\u00e0 730.000 km de la sonde) on distingue Europe : second\u00a0satellite galil\u00e9en (en partant de la plan\u00e8te g\u00e9ante), il est recouvert d\u2019une couche de glace parcourue de longues fractures, sous laquelle se trouve sans doute un oc\u00e9an.<\/p>\n<div class=\"PopinEmbedVideo__embedHtml___3b04u\">\n<!-- iframe plugin v.5.1 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" frameborder=\"0\" width=\"480\" height=\"270\" src=\"\/\/www.dailymotion.com\/embed\/video\/x39n69k\" 0=\"allowfullscreen&gt;&lt;\/iframe\" scrolling=\"yes\" class=\"iframe-class\"><\/iframe>\n<\/div>\n<div><\/div>\n<p>Les images de JunoCam (qui sont trait\u00e9es par des contributeurs citoyens, ici Roman Tkachenko), sont destin\u00e9es \u00e0 faire d\u00e9couvrir Jupiter et ses lunes au grand public, mais la sonde est bard\u00e9e d&#8217;instruments scientifiques qui commencent \u00e0 dresser un portrait in\u00e9dit de la plus grosse plan\u00e8te du Syst\u00e8me solaire.<\/p>\n<p>Les mesures r\u00e9alis\u00e9es depuis l&#8217;\u00e9t\u00e9 2016 laissent penser que le noyau de Jupiter pourrait ne pas \u00eatre totalement solide. Juno a \u00e9galement d\u00e9couvert que le champ magn\u00e9tique de la plan\u00e8te est 1,5 fois plus fort que ce que l&#8217;on pr\u00e9disait et que les superbes <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/09\/12\/juno-enregistre-aurore-polaire-australe-jupiter\/\" target=\"_blank\" rel=\"noopener\">aurores polaires<\/a> observ\u00e9es par le pass\u00e9 semblent trouver leur origine dans les particules \u00e9nerg\u00e9tiques qui s&#8217;\u00e9chappent de l&#8217;int\u00e9rieur de la plan\u00e8te.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Au cours de sa huiti\u00e8me orbite autour de Jupiter, la sonde Juno a immortalis\u00e9 la plan\u00e8te gazeuse g\u00e9ante et deux de ses satellites, Io et Europe.\u00a0 Depuis leur d\u00e9couverte il y a un peu plus de quatre si\u00e8cles par le grand savant italien Galil\u00e9e\u00a0\u00e0 l&#8217;aide d&#8217;une modeste lunette astronomique, les quatre principaux satellites de Jupiter &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/10\/08\/sonde-juno-photographie-ensemble-jupiter-io-europe\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">La sonde Juno photographie ensemble Jupiter, Io et Europe<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":8306,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[1906,412,158,413,1685,90,2331,2330],"class_list":["post-8305","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-aurores-polaires","tag-europe","tag-galilee","tag-io","tag-juno","tag-jupiter","tag-roman-tkachenko","tag-satellite-galileen"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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