{"id":7566,"date":"2017-05-04T18:53:49","date_gmt":"2017-05-04T18:53:49","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=7566"},"modified":"2017-05-13T09:02:00","modified_gmt":"2017-05-13T09:02:00","slug":"etonnant-transit-de-phobos-devant-la-planete-mars","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/04\/etonnant-transit-de-phobos-devant-la-planete-mars\/","title":{"rendered":"L&#8217;\u00e9tonnant transit de Phobos devant la plan\u00e8te Mars"},"content":{"rendered":"<p><strong>Le passage du satellite Phobos devant Mars reste l&#8217;une des images les plus extraordinaires prises au cours des missions vers la Plan\u00e8te rouge.<\/strong><\/p>\n<p>D\u00e9couvert par l\u2019astronome am\u00e9ricain Asaph Hall le 18 ao\u00fbt 1877 \u00e0 l\u2019aide d\u2019une <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/05\/05\/bien-choisir-sa-premiere-lunette-astronomique\/\" target=\"_blank\" rel=\"noopener noreferrer\">lunette astronomique<\/a> de 66 cm de diam\u00e8tre,\u00a0Phobos, un astre tr\u00e8s irr\u00e9gulier de 27X22X19 km, est le plus grand des deux satellites de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/02\/14\/planetes-mars-venus-a-lheure-ou-sonne-langelus\/\" target=\"_blank\" rel=\"noopener noreferrer\">Mars<\/a>, l\u2019autre \u00e9tant Deimos.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/03\/phobos.jpg\" rel=\"lightbox[7566]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-7571\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/03\/phobos-450x328.jpg\" alt=\"\" width=\"450\" height=\"328\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/03\/phobos-450x328.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/03\/phobos-768x560.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/03\/phobos-1024x747.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/03\/phobos.jpg 1234w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Mais pourquoi Phobos est-il un satellite si sombre, comme le montre ce clich\u00e9 r\u00e9alis\u00e9 en 2010 par l&#8217;orbiteur <a href=\"http:\/\/www.esa.int\/Our_Activities\/Space_Science\/Mars_Express\" target=\"_blank\" rel=\"noopener noreferrer\">Mars Express<\/a> qui fut lanc\u00e9 du cosmodrome de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/11\/16\/en-video-super-lune-leve-sur-baikonour\/\" target=\"_blank\" rel=\"noopener noreferrer\">Ba\u00efkonour<\/a> le 2 juin 2003 avant de se satelliser 6 mois plus tard autour de la Plan\u00e8te rouge ?<!--more--><\/p>\n<p>Phobos, la plus grande et la plus int\u00e9rieure des deux lunes martiennes, est le satellite le plus sombre de tout le Syst\u00e8me solaire. Son orbite et sa couleur inhabituelles laissent entendre qu&#8217;il peut s&#8217;agir d&#8217;un ast\u00e9ro\u00efde captur\u00e9 par la Plan\u00e8te rouge. Compos\u00e9 d&#8217;un m\u00e9lange de glace et de roche, il est recouvert comme la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/04\/19\/clair-de-lune-pont-arvaux\/\" target=\"_blank\" rel=\"noopener noreferrer\">Lune <\/a>d\u2019un \u00e9pais manteau de r\u00e9golithe, une couche de poussi\u00e8re qui r\u00e9sulte du bombardement m\u00e9t\u00e9oritique.<\/p>\n<p>Ce satellite orbite si pr\u00e8s de Mars que de certains endroits on peut le voir se lever et se coucher deux fois par jour alors qu&#8217;il est invisible depuis d&#8217;autres endroits. L&#8217;orbite de Phobos autour de Mars ne cesse de d\u00e9cro\u00eetre : dans 20 \u00e0 40 millions d\u2019ann\u00e9es le satellite sera tellement proche de la Plan\u00e8te rouge qu&#8217;il sera d\u00e9truit par les forces de mar\u00e9e. Ses morceaux tomberont sur la plan\u00e8te sans doute apr\u00e8s avoir form\u00e9 des anneaux autour de Mars pendant quelques dizaines de millions d\u2019ann\u00e9es.<\/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>Le passage du satellite Phobos devant Mars reste l&#8217;une des images les plus extraordinaires prises au cours des missions vers la Plan\u00e8te rouge. D\u00e9couvert par l\u2019astronome am\u00e9ricain Asaph Hall le 18 ao\u00fbt 1877 \u00e0 l\u2019aide d\u2019une lunette astronomique de 66 cm de diam\u00e8tre,\u00a0Phobos, un astre tr\u00e8s irr\u00e9gulier de 27X22X19 km, est le plus grand des &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/04\/etonnant-transit-de-phobos-devant-la-planete-mars\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">L&#8217;\u00e9tonnant transit de Phobos devant la plan\u00e8te Mars<\/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":7571,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[1083,240,1082,116,702,1081,115,2145],"class_list":["post-7566","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-asaph-hall","tag-asteroide","tag-deimos","tag-mars","tag-mars-express","tag-phobos","tag-planete-rouge","tag-regolithe"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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