{"id":793,"date":"2011-09-30T12:53:00","date_gmt":"2011-09-30T10:53:00","guid":{"rendered":"https:\/\/kids.esa.int\/european_firsts_for_galileo_satnav_and_soyuz\/"},"modified":"2026-10-08T00:32:19","modified_gmt":"2026-10-07T22:32:19","slug":"european_firsts_for_galileo_satnav_and_soyuz","status":"publish","type":"post","link":"https:\/\/kids.esa.int\/fr\/european_firsts_for_galileo_satnav_and_soyuz\/","title":{"rendered":"Deux grandes premi\u00e8res europ\u00e9ennes pour Galileo et Soyuz"},"content":{"rendered":"<div class=\"lede\">\n<p>Le compte \u00e0 rebours est enclench\u00e9 pour deux rendez-vous historiques dans l'histoire spatiale europ\u00e9enne. Si tout se d\u00e9roule comme pr\u00e9vu, la premi\u00e8re fus\u00e9e Soyuz d\u00e9collera le 20 octobre du Centre spatial de Kourou, en Guyane fran\u00e7aise. Le v\u00e9hicule Soyuz ST-B transportera les deux premiers satellites du syst\u00e8me de navigation europ\u00e9en Galileo.<\/p>\n<\/div>\n<p>La fus\u00e9e russe Soyuz est l'un des lanceurs les plus fiables au monde. Lorsque le nouveau site de lancement de Kourou sera termin\u00e9, la fus\u00e9e \u00e0 trois \u00e9tages pourra lancer en orbite des charges utiles plus lourdes.<\/p>\n<p>Le premier satellite d'essai du syst\u00e8me de navigation europ\u00e9en Galileo a \u00e9t\u00e9 lanc\u00e9 en d\u00e9cembre 2005, suivi d'un deuxi\u00e8me en 2008. Le succ\u00e8s de ces satellites pionniers a ouvert la voie au lancement prochain des deux premiers satellites Galileo de validation en orbite (IOV). L'ann\u00e9e prochaine, ils seront rejoints par une deuxi\u00e8me paire de satellites.<\/p>\n<figure class=\"wp-block-image size-natural\" data-width=\"190\" data-credit=\"ESA - S. Corvaja, 2011\" data-detail-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Images\/2011\/09\/Soyuz_LNB_Next_launch_image2\" data-licence=\"ESA Standard Licence\" data-licence-url=\"https:\/\/www.esa.int\/ESA_Multimedia\/Terms_and_conditions_of_use_of_images_and_videos_available_on_the_esa_website\"><img decoding=\"async\" loading=\"lazy\" style=\"max-width:100%;height:auto\" src=\"https:\/\/media.esa.int\/legacy\/web\/images\/esa_multimedia\/images\/2011\/09\/soyuz_lnb_next_launch_image2\/17884102-2-eng-GB\/Soyuz_LNB_Next_launch_image.jpg\" alt=\"\"><\/figure>\n<p>Les quatre engins spatiaux IOV, pesant chacun environ 730 kg, sont construits par un consortium industriel dirig\u00e9 par la soci\u00e9t\u00e9 allemande EADS Astrium. Ils serviront \u00e0 valider la conception du syst\u00e8me Galileo, avant l\u2019arriv\u00e9e des 26 autres satellites qui viendront les rejoindre. L'un des \u00e9l\u00e9ments \u00e0 tester est la meilleure horloge atomique jamais embarqu\u00e9e \u00e0 des fins de navigation \u2013 pr\u00e9cise \u00e0 une seconde pr\u00e8s tous les trois millions d'ann\u00e9es. Les satellites sont \u00e9galement \u00e9quip\u00e9s d'un puissant \u00e9metteur permettant de diffuser des donn\u00e9es de navigation pr\u00e9cises dans le monde entier.<\/p>\n<p>Une fois la constellation compl\u00e8te, le syst\u00e8me comptera 30 satellites, orbitant \u00e0 plus de 23 000 km au-dessus de la Terre. O\u00f9 que vous soyez dans le monde, il y aura toujours au moins quatre satellites au-dessus de l'horizon, garantissant une disponibilit\u00e9 24\/24 heures et 7\/7 jours de Galileo pour aider les utilisateurs \u00e0 trouver leur chemin.<\/p>","protected":false},"excerpt":{"rendered":"<p>The countdown is under way for two landmark events in the history of European space. If all goes according to plan, the first Soyuz rocket to fly from the Kourou [&hellip;]<\/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:\/\/media.esa.int\/legacy\/web\/images\/esa_multimedia\/images\/2011\/01\/first_two_galileo_iov_satellites2\/17908124-2-eng-GB\/First_two_Galileo_IOV_satellites.jpg","esa_banner_description":"First two Galileo IOV satellites","esa_banner_credit":"ESA \u2013 P. 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