{"id":1262,"date":"2014-11-30T17:07:10","date_gmt":"2014-11-30T17:07:10","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=1262"},"modified":"2014-12-03T13:08:55","modified_gmt":"2014-12-03T13:08:55","slug":"callisto-occulte-io","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/11\/30\/callisto-occulte-io\/","title":{"rendered":"Quand Callisto occulte Io"},"content":{"rendered":"

Tous les 6 ans en moyenne, les positions relatives du Soleil<\/a>, de la Terre et de Jupiter <\/a>offrent la possibilit\u00e9 d’observer les ph\u00e9nom\u00e8nes mutuels des satellites de Jupiter(on parle de ph\u00e9mus).<\/p>\n

On distingue deux grands types de ph\u00e9nom\u00e8nes : les \u00e9clipses (un satellite passe dans l’ombre d’un autre satellite) et les occultations (un satellite passe devant un autre satellite). Le 02 novembre dernier Callisto a occult\u00e9 Io, comme le montre ce montage r\u00e9alis\u00e9 par l’astronome amateur Marco Guidi<\/a> qui utilisait un t\u00e9lescope de Dobson<\/a> de 50 centim\u00e8tres de diam\u00e8tre (20 inch<\/em>).<\/p>\n

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

Callisto (quatri\u00e8me satellite en partant de Jupiter) est le plus grand (4820 kilom\u00e8tres) et le plus sombre (sa surface, un m\u00e9lange de roche et de glace, est tr\u00e8s ancienne). Io mesure 3640 kilom\u00e8tres et la brillance de sa surface s’explique par sa position : premier satellite en partant de Jupiter, Io (d\u00e9form\u00e9 par les formes 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

L’observation de telles occultations permet de suivre l’activit\u00e9 volcanique sur Io : la disparition du flux infrarouge \u00e9mis par un volcan lorsqu’il est occult\u00e9 par un satellite permet de localiser sa position sur Io.<\/p>\n","protected":false},"excerpt":{"rendered":"

Tous les 6 ans en moyenne, les positions relatives du Soleil, de la Terre et de Jupiter offrent la possibilit\u00e9 d’observer les ph\u00e9nom\u00e8nes mutuels des satellites de Jupiter(on parle de ph\u00e9mus). On distingue deux grands types de ph\u00e9nom\u00e8nes : les \u00e9clipses (un satellite passe dans l’ombre d’un autre satellite) et les occultations (un satellite passe … Continuer la lecture de Quand Callisto occulte Io<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":1263,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[415,338,316,585,542,586,413,90,583,106,582,584,568,97,96,175,3],"class_list":["post-1262","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-callisto","tag-dobson","tag-eclipse","tag-force-de-maree","tag-glace","tag-infrarouge","tag-io","tag-jupiter","tag-marco-guidi","tag-occultation","tag-phemus","tag-roche","tag-satellite","tag-soleil","tag-telescope","tag-terre","tag-volcan"],"yoast_head":"\ncallisto io<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/11\/30\/callisto-occulte-io\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"callisto io\" \/>\n<meta property=\"og:description\" content=\"Tous les 6 ans en moyenne, les positions relatives du Soleil, de la Terre et de Jupiter offrent la possibilit\u00e9 d’observer les ph\u00e9nom\u00e8nes mutuels des satellites de Jupiter(on parle de ph\u00e9mus). On distingue deux grands types de ph\u00e9nom\u00e8nes : les \u00e9clipses (un satellite passe dans l’ombre d’un autre satellite) et les occultations (un satellite passe … Continuer la lecture de Quand Callisto occulte Io →\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/11\/30\/callisto-occulte-io\/\" \/>\n<meta property=\"og:site_name\" content=\"CIELMANIA : le blog de Jean-Baptiste FELDMANN, photographe du ciel\" \/>\n<meta property=\"article:published_time\" content=\"2014-11-30T17:07:10+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2014-12-03T13:08:55+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/11\/IoCallistoSequenza_Guidi.png\" \/>\n\t<meta property=\"og:image:width\" content=\"824\" \/>\n\t<meta property=\"og:image:height\" content=\"579\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Jean-Baptiste FELDMANN\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jean-Baptiste FELDMANN\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/11\/30\/callisto-occulte-io\/\",\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/11\/30\/callisto-occulte-io\/\",\"name\":\"callisto io\",\"isPartOf\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/11\/30\/callisto-occulte-io\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/11\/30\/callisto-occulte-io\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/11\/IoCallistoSequenza_Guidi.png\",\"datePublished\":\"2014-11-30T17:07:10+00:00\",\"dateModified\":\"2014-12-03T13:08:55+00:00\",\"author\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#\/schema\/person\/62b391b709c307783237b759b62731ea\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/11\/30\/callisto-occulte-io\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/11\/30\/callisto-occulte-io\/#primaryimage\",\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/11\/IoCallistoSequenza_Guidi.png\",\"contentUrl\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2014\/11\/IoCallistoSequenza_Guidi.png\",\"width\":824,\"height\":579},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#website\",\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/\",\"name\":\"CIELMANIA : le blog de Jean-Baptiste FELDMANN, photographe du ciel\",\"description\":\""J'ai en moi un besoin terrible. 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