{"id":1767,"date":"2015-02-03T06:02:00","date_gmt":"2015-02-03T06:02:00","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=1767"},"modified":"2015-02-09T06:07:09","modified_gmt":"2015-02-09T06:07:09","slug":"les-crateres-du-satellite-janus-vus-par-la-sonde-cassini","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/03\/les-crateres-du-satellite-janus-vus-par-la-sonde-cassini\/","title":{"rendered":"Les crat\u00e8res du satellite Janus vus par la sonde Cassini"},"content":{"rendered":"<p>Janus, l&#8217;un des nombreux satellites de la plan\u00e8te gazeuse g\u00e9ante <a title=\"Saturne dans l\u2019ombre des anneaux\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/08\/saturne-dans-lombre-des-anneaux\/\" target=\"_blank\">Saturne<\/a>, a \u00e9t\u00e9 d\u00e9couvert \u00e0 la fin de l&#8217;ann\u00e9e 1966 par <a title=\"Le dernier vol d'Audouin Dollfus\" href=\"http:\/\/www.futura-sciences.com\/magazines\/espace\/infos\/actu\/d\/astronomie-dernier-vol-audouin-dollfus-25426\/\" target=\"_blank\">Audouin Dollfus<\/a> (1924-2010).<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/01\/janus2.jpg\" rel=\"lightbox[1767]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-1769\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/01\/janus2-450x337.jpg\" alt=\"janus2\" width=\"450\" height=\"337\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/01\/janus2-450x337.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/01\/janus2-1024x768.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/01\/janus2.jpg 1199w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>L&#8217;<a title=\"Lumi\u00e8re rouge pour les astronomes\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/12\/14\/lumiere-rouge-les-astronomes\/\" target=\"_blank\">astronome<\/a> fran\u00e7ais avait alors choisi d&#8217;utiliser le t\u00e9lescope de 1m de l&#8217;Observatoire du Pic du Midi lors d&#8217;un des rares passages de la Terre dans le plan des anneaux de <a title=\"La Lune et Saturne se rapprochent\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/09\/28\/lune-saturne-se-rapprochent\/\" target=\"_blank\">Saturne <\/a>: vus par la tranche, les anneaux disparaissent presque compl\u00e8tement \u00e0 cette \u00e9poque et les plus petits satellites deviennent rep\u00e9rables.<\/p>\n<p><!--more-->Dans les <a title=\"En images : les t\u00e9lescopes des amateurs\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/14\/en-images-les-telescopes-amateurs\/\" target=\"_blank\">t\u00e9lescopes <\/a>et les <a title=\"La lunette astronomique\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/07\/07\/lunette-astronomique\/\" target=\"_blank\">lunettes astronomiques<\/a>\u00a0terrestres, Janus n&#8217;est qu&#8217;un petit point. Il a donc fallu attendre la mission <a title=\"Cassini Solstice Mission\" href=\"http:\/\/saturn.jpl.nasa.gov\/\" target=\"_blank\">Cassini <\/a>pour d\u00e9couvrir \u00e0 quoi ressemblait cette lune dont la forme g\u00e9n\u00e9rale rappelle celle d&#8217;une pomme de terre de 194\u00d7190\u00d7154 km.<\/p>\n<p>La surface de Janus (r\u00e9v\u00e9l\u00e9e sur cette image prise \u00e0 environ 87 000 km de distance) pr\u00e9sente de nombreux crat\u00e8res d&#8217;impact dont certains atteignent 30 km de diam\u00e8tre. Ce bombardement m\u00e9t\u00e9oritique est \u00e0 l&#8217;origine d&#8217;un petit anneau de poussi\u00e8res autour de Janus qui a \u00e9t\u00e9 mis en \u00e9vidence par la sonde Cassini en 2006.<\/p>\n<p>Dans la mythologie romaine, Janus \u00e9tait le dieu aux deux visages qui accueillit Saturne, chass\u00e9 du pouvoir par son fils <a title=\"Incroyable triple transit de satellites devant Jupiter\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/01\/25\/incroyable-triple-transit-de-satellites-devant-jupiter\/\" target=\"_blank\">Jupiter <\/a>(le seul de ses enfants qui n&#8217;ait pas \u00e9t\u00e9 d\u00e9vor\u00e9 par son p\u00e8re).<\/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>Janus, l&#8217;un des nombreux satellites de la plan\u00e8te gazeuse g\u00e9ante Saturne, a \u00e9t\u00e9 d\u00e9couvert \u00e0 la fin de l&#8217;ann\u00e9e 1966 par Audouin Dollfus (1924-2010). L&#8217;astronome fran\u00e7ais avait alors choisi d&#8217;utiliser le t\u00e9lescope de 1m de l&#8217;Observatoire du Pic du Midi lors d&#8217;un des rares passages de la Terre dans le plan des anneaux de Saturne &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/03\/les-crateres-du-satellite-janus-vus-par-la-sonde-cassini\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Les crat\u00e8res du satellite Janus vus par la sonde Cassini<\/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":1768,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[622,94,816,108,815,90,553,570,170,104,817,568,136,96],"class_list":["post-1767","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-anneau","tag-astronome","tag-audouin-dollfus","tag-cratere","tag-janus","tag-jupiter","tag-meteorite","tag-mission-cassini-huygens","tag-mythologie","tag-observatoire","tag-pic-du-midi","tag-satellite","tag-saturne","tag-telescope"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Les crat\u00e8res du satellite Janus vus par la sonde Cassini<\/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\/2015\/02\/03\/les-crateres-du-satellite-janus-vus-par-la-sonde-cassini\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les crat\u00e8res du satellite Janus vus par la sonde Cassini\" \/>\n<meta property=\"og:description\" content=\"Janus, l&#8217;un des nombreux satellites de la plan\u00e8te gazeuse g\u00e9ante Saturne, a \u00e9t\u00e9 d\u00e9couvert \u00e0 la fin de l&#8217;ann\u00e9e 1966 par Audouin Dollfus (1924-2010). L&#8217;astronome fran\u00e7ais avait alors choisi d&#8217;utiliser le t\u00e9lescope de 1m de l&#8217;Observatoire du Pic du Midi lors d&#8217;un des rares passages de la Terre dans le plan des anneaux de Saturne &hellip; Continuer la lecture de Les crat\u00e8res du satellite Janus vus par la sonde Cassini &rarr;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/03\/les-crateres-du-satellite-janus-vus-par-la-sonde-cassini\/\" \/>\n<meta property=\"og:site_name\" content=\"CIELMANIA : le blog de Jean-Baptiste FELDMANN, photographe du ciel\" \/>\n<meta property=\"article:published_time\" content=\"2015-02-03T06:02:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2015-02-09T06:07:09+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/01\/janus1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\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\/2015\/02\/03\/les-crateres-du-satellite-janus-vus-par-la-sonde-cassini\/\",\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/03\/les-crateres-du-satellite-janus-vus-par-la-sonde-cassini\/\",\"name\":\"Les crat\u00e8res du satellite Janus vus par la sonde Cassini\",\"isPartOf\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/03\/les-crateres-du-satellite-janus-vus-par-la-sonde-cassini\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/03\/les-crateres-du-satellite-janus-vus-par-la-sonde-cassini\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/01\/janus1.jpg\",\"datePublished\":\"2015-02-03T06:02:00+00:00\",\"dateModified\":\"2015-02-09T06:07:09+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\/2015\/02\/03\/les-crateres-du-satellite-janus-vus-par-la-sonde-cassini\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/03\/les-crateres-du-satellite-janus-vus-par-la-sonde-cassini\/#primaryimage\",\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/01\/janus1.jpg\",\"contentUrl\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/01\/janus1.jpg\",\"width\":1200,\"height\":900},{\"@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\":\"&quot;J&#039;ai en moi un besoin terrible. 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