{"id":839,"date":"2004-12-02T15:26:00","date_gmt":"2004-12-02T14:26:00","guid":{"rendered":"https:\/\/kids.esa.int\/countdown\/"},"modified":"2026-10-08T00:32:51","modified_gmt":"2026-10-07T22:32:51","slug":"countdown","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/countdown\/","title":{"rendered":"Compte \u00e0 rebours"},"content":{"rendered":"
\n

Une campagne de lancement Ariane 5 dure d\u2019habitude environ cinq semaines. Au d\u00e9but, les \u00e9quipes pr\u00e9parent et v\u00e9rifient la fus\u00e9e et les satellites. Les travaux sont effectu\u00e9s par des \u00e9quipes diff\u00e9rentes, mais la campagne est organis\u00e9e de fa\u00e7on que tout soit pr\u00eat en temps voulu.<\/p>\n<\/div>\n

12 jours avant le lancement, on commence \u00e0 int\u00e9grer les satellites en haut du lanceur. Cette op\u00e9ration est effectu\u00e9e dans le b\u00e2timent d\u2019assemblage final.<\/p>\n

Un jour avant le d\u00e9collage, la fus\u00e9e Ariane 5 est conduite sur des rails jusqu\u2019au pas de tir. Le compte \u00e0 rebours final commence d\u00e8s que la table de lancement mobile est reli\u00e9e au pas de tir.<\/p>\n

Les r\u00e9servoirs principaux de carburant sont remplis, les sous-syst\u00e8mes du lanceur contr\u00f4l\u00e9s et le programme de vol charg\u00e9 dans l\u2019ordinateur. Enfin \u00e0 -6 min 30s, le compte \u00e0 rebours devient automatique.<\/p>\n

\"10, 9, 8, \u2026 \". Le Directeur des Op\u00e9rations termine le compte \u00e0 rebours derri\u00e8re les vitres de s\u00e9curit\u00e9 du centre de commande Jupiter, \u00e0 12 km du pas de tir.<\/p>\n

\"\u2026 3, 2, 1, d\u00e9collage\". Les moteurs s\u2019allument et le lanceur d\u00e9colle. Guid\u00e9e par un pilote automatique, Ariane 5 est surveill\u00e9e attentivement lors de son d\u00e9part vers l\u2019est ou vers le nord au-dessus de l\u2019oc\u00e9an.<\/p>\n

40 minutes apr\u00e8s, la mise en orbite de l\u2019engin spatial est annonc\u00e9e. Mission accomplie.<\/p>","protected":false},"excerpt":{"rendered":"

An Ariane-5 launch campaign usually lasts about five weeks. During the early stages, the teams prepare and check the rocket and the satellites. Although the work is done by different […]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"esa_banner_image":"https:\/\/www.esa.int\/var\/esa\/storage\/images\/esa_multimedia\/images\/2001\/11\/countdown_to_launch2\/17863307-3-eng-GB\/Countdown_to_launch.gif","esa_banner_description":"Countdown to launch","esa_banner_credit":"ESA","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2001\/11\/Countdown_to_launch2","esa_external_url":"","esa_external_new_window":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":true},"categories":[10,41,40],"tags":[2],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-839","post","type-post","status-publish","format-standard","hentry","category-learn","category-rockets-technology","category-technology","tag-background-article"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/839","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/comments?post=839"}],"version-history":[{"count":1,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/839\/revisions"}],"predecessor-version":[{"id":1982,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/839\/revisions\/1982"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=839"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=839"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=839"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=839"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=839"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=839"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=839"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=839"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=839"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=839"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}