{"id":2955,"date":"2015-06-14T07:05:38","date_gmt":"2015-06-14T07:05:38","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=2955"},"modified":"2015-06-19T04:40:59","modified_gmt":"2015-06-19T04:40:59","slug":"phobos-saisi-a-contre-jour-par-la-sonde-martienne-mom","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/06\/14\/phobos-saisi-a-contre-jour-par-la-sonde-martienne-mom\/","title":{"rendered":"Phobos saisi \u00e0 contre-jour par la sonde martienne MOM"},"content":{"rendered":"

La sonde indienne MOM en orbite autour de la Plan\u00e8te rouge a r\u00e9alis\u00e9 une \u00e9tonnante image du satellite Phobos au-dessus de l’atmosph\u00e8re martienne.<\/strong><\/p>\n

Premi\u00e8re sonde spatiale martienne d\u00e9velopp\u00e9e par l’ISRO<\/a> (Indian Space Research Organisation<\/em>), MOM (Mars Orbiter Mission<\/em>) a \u00e9t\u00e9 lanc\u00e9e le 5 novembre 2013. Depuis le 24 septembre 2014 MOM tourne autour de la plan\u00e8te Mars <\/a>sur une orbite tr\u00e8s elliptique qui peut l’amener \u00e0 427 km d’altitude et l’\u00e9loigner jusqu’\u00e0 78 500 km.<\/p>\n

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

La sonde indienne a photographi\u00e9 le satellite Phobos a contre-jour. Phobos, le plus grand des deux satellites de Mars <\/a>(l’autre \u00e9tant Deimos) est un astre tr\u00e8s irr\u00e9gulier de 27X22X19 km.<\/p>\n

D\u00e9couvert par l’astronome am\u00e9ricain Asaph Hall le 18 ao\u00fbt 1877 \u00e0 l’aide d’une lunette astronomique<\/a> de 66 cm de diam\u00e8tre, Phobos se d\u00e9tache ici comme une tache d’encre sur la fine couche gazeuse qui ceinture Mars<\/a>.<\/p>\n

L’atmosph\u00e8re martienne, compos\u00e9e principalement de dioxyde de carbone, est tr\u00e8s t\u00e9nue ; la pression atmosph\u00e9rique sur la Plan\u00e8te rouge est environ 170 fois plus faible que la pression terrestre. Mais cela suffit pour cr\u00e9er une circulation des vents \u00e0 l’origine d’une lente \u00e9rosion des sols. Il arrive m\u00eame que ces vents donnent naissance \u00e0 de formidables temp\u00eates de sable capables de nous cacher les reliefs martiens pendant plusieurs semaines.<\/p>\n

Avec MOM, l’agence spatiale indienne a frapp\u00e9 un grand coup : forte de l’exp\u00e9rience acquise avec la sonde lunaire\u00a0Chandrayaan-1<\/a>, l’ISRO permet \u00e0 l’Inde de devenir la quatri\u00e8me puissance spatiale capable d’envoyer une sonde vers Mars<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

La sonde indienne MOM en orbite autour de la Plan\u00e8te rouge a r\u00e9alis\u00e9 une \u00e9tonnante image du satellite Phobos au-dessus de l’atmosph\u00e8re martienne. Premi\u00e8re sonde spatiale martienne d\u00e9velopp\u00e9e par l’ISRO (Indian Space Research Organisation), MOM (Mars Orbiter Mission) a \u00e9t\u00e9 lanc\u00e9e le 5 novembre 2013. Depuis le 24 septembre 2014 MOM tourne autour de la … Continuer la lecture de Phobos saisi \u00e0 contre-jour par la sonde martienne MOM<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":2957,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[1083,1082,1080,1079,116,1078,1081,568],"class_list":["post-2955","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-asaph-hall","tag-deimos","tag-inde","tag-isro","tag-mars","tag-mom","tag-phobos","tag-satellite"],"yoast_head":"\nPhobos saisi \u00e0 contre-jour par la sonde martienne MOM<\/title>\n<meta name=\"description\" content=\"La sonde indienne MOM en orbite autour de la Plan\u00e8te rouge a r\u00e9alis\u00e9 une \u00e9tonnante image du satellite Phobos au-dessus de l'atmosph\u00e8re martienne.\" \/>\n<meta name=\"robots\" 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