{"id":346,"date":"2009-05-15T08:08:00","date_gmt":"2009-05-15T06:08:00","guid":{"rendered":"https:\/\/kids.esa.int\/launch_events_of_herschel_and_planck\/"},"modified":"2026-10-08T00:27:07","modified_gmt":"2026-10-07T22:27:07","slug":"launch_events_of_herschel_and_planck","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/launch_events_of_herschel_and_planck\/","title":{"rendered":"Manifestations autour du lancement de Herschel et Planck"},"content":{"rendered":"
\n

L\u2019excitation monte partout dans le monde, alors qu\u2019approche l\u2019heure du lancement de deux nouveaux puissants observatoires spatiaux de l\u2019ESA - Herschel et Planck. Les vaisseaux seront lanc\u00e9s au m\u00eame moment depuis le port spatial de l\u2019ESA \u00e0 Kourou, en Guyane fran\u00e7aise, \u00e0 15 h 12 (heure d'\u00e9t\u00e9 d'Europe centrale), le 14 mai. Fix\u00e9s tout en haut de leur fus\u00e9e g\u00e9ante Ariane 5, les deux combin\u00e9s mesureront pr\u00e8s de 11 m de haut sur 4,5 m de large et p\u00e8seront 5,7 tonnes.<\/p>\n<\/div>\n

Environ 2 minutes et demie apr\u00e8s le d\u00e9collage, les acc\u00e9l\u00e9rateurs \u00e0 combustible solide d\u2019Ariane 5 se d\u00e9tacheront. Le car\u00e9nage de protection des satellites sera largu\u00e9 une cinquantaine de secondes plus tard. L\u2019\u00e9tage sup\u00e9rieur se d\u00e9tachera ensuite et son moteur s\u2019allumera pendant pr\u00e8s de 9 minutes. Au moment o\u00f9 les satellites se s\u00e9pareront, l\u2019\u00e9tage se d\u00e9placera \u00e0 une vitesse approximative de 10 km\/s. Herschel sera le premier \u00e0 \u00eatre largu\u00e9, environ 26 minutes apr\u00e8s le d\u00e9collage, suivi de Planck, environ 2 minutes et demie plus tard.<\/p>\n

\"\"<\/figure>\n

Lors des phases initiales de la mission, les contr\u00f4leurs de mission surveilleront les satellites 22 heures par jour depuis les stations au sol de l\u2019ESA en Australie, en Espagne et en Am\u00e9rique du Sud. Les deux satellites se dirigeront ensuite vers L2, un point donn\u00e9 dans l\u2019espace qui se situe \u00e0 1,5 million de kilom\u00e8tres de notre plan\u00e8te, sur sa face nocturne. L2 est un endroit propice car il leur permettra d\u2019observer le ciel sans subir les inconv\u00e9nients de la lumi\u00e8re du Soleil, tout en consommant tr\u00e8s peu de combustible. Planck devrait commencer \u00e0 renvoyer des donn\u00e9es en juillet, suivi de Herschel en septembre.<\/p>\n

Updates on the launch and the progress of the satellites are provided at www.esa.int\/herschelplanck<\/a> and several other ESA websites. Information is also available on Flickr at www.flickr.com\/eurospaceagency<\/a> and on Twitter at www.twitter.com\/eurospaceagency<\/a> .<\/p>","protected":false},"excerpt":{"rendered":"

Excitement is building around the world as the clock counts down to the launch of two powerful new ESA space observatories \u2013 Herschel and Planck. The spacecraft will be launched […]<\/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\/2009\/03\/herschel_separates_from_upper_stage2\/17913295-2-eng-GB\/Herschel_separates_from_upper_stage.jpg","esa_banner_description":"Herschel separates from upper stage","esa_banner_credit":"ESA \u2013 D. Ducros, 2009","esa_banner_licence":"ESA Standard Licence","esa_banner_detail_url":"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2009\/03\/Herschel_separates_from_upper_stage2","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":[10,11,21],"tags":[],"panel":[],"language":[],"age":[],"duration":[],"resource_type":[],"audience":[],"wf_post_folders":[],"class_list":["post-346","post","type-post","status-publish","format-standard","hentry","category-learn","category-our-universe","category-stars-and-galaxies"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/346","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=346"}],"version-history":[{"count":5,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/346\/revisions"}],"predecessor-version":[{"id":4408,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/posts\/346\/revisions\/4408"}],"wp:attachment":[{"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/media?parent=346"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/categories?post=346"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/tags?post=346"},{"taxonomy":"panel","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/panel?post=346"},{"taxonomy":"language","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/language?post=346"},{"taxonomy":"age","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/age?post=346"},{"taxonomy":"duration","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/duration?post=346"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/resource_type?post=346"},{"taxonomy":"audience","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/audience?post=346"},{"taxonomy":"wf_post_folders","embeddable":true,"href":"https:\/\/kids.esa.int\/fr\/wp-json\/wp\/v2\/wf_post_folders?post=346"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}