{"id":634,"date":"2017-06-14T12:52:34","date_gmt":"2017-06-14T12:52:34","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/frankel\/?p=634"},"modified":"2018-01-12T21:57:49","modified_gmt":"2018-01-12T21:57:49","slug":"reports-en-cascade","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/frankel\/2017\/06\/14\/reports-en-cascade\/","title":{"rendered":"Reports en cascade"},"content":{"rendered":"

Volont\u00e9 de ne pas courir trop de li\u00e8vres \u00e0 la fois et retards techniques pris par les principaux constructeurs de fus\u00e9es font que le calendrier des grands travaux martiens, pour pr\u00e9parer une mission habit\u00e9e, a gliss\u00e9 d\u2019au moins deux ans. Les observateurs d\u00e9sabus\u00e9s pourront commenter que c\u2019est d\u00e9sormais la routine\u2026<\/p>\n

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La super fus\u00e9e SLS de la NASA ne conna\u00eetra son premier vol qu’en 2019… au plus t\u00f4t (NASA\/MSFC)<\/figcaption><\/figure>\n

Emp\u00eatr\u00e9e dans un programme sans queue ni t\u00eate d\u2019exploration pilot\u00e9e de l\u2019espace profond, la NASA a report\u00e9 le premier vol d\u2019essai\u2014Exploration Mission\u00a01<\/em>\u2014de son nouveau lanceur lourd SLS (Space Launch System<\/em>, en attendant un nom plus sexy), qui devait propulser une cabine Orion sans \u00e9quipage autour de la Lune en novembre 2018. Le vol est d\u00e9sormais report\u00e9 \u00e0 une date ind\u00e9termin\u00e9e en 2019. La seconde mission (Exploration Mission\u00a02<\/em>) doit r\u00e9it\u00e9rer la mission circumlunaire, cette fois avec \u00e9quipage\u00a0: initialement pr\u00e9vue en octobre 2021, elle est d\u00e9sormais report\u00e9e \u00e0 avril 2023. Six ans pour mettre au point un vol type Apollo 8 que la NASA de l\u2019\u00e9poque avait improvis\u00e9e en un mois\u00a0: sans commentaire\u2026<\/p>\n

Les raisons de ces glissements de programme\u00a0? Dommages inflig\u00e9s \u00e0 l\u2019usine de Louisiane par un ouragan, probl\u00e8mes de soudure dans la construction du premier \u00e9tage, et retards dans la construction et la livraison par l\u2019Europe du module de service de la cabine Orion\u2026<\/p>\n

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Red Dragon de SpaceX devait partir pour Mars en 2018. Il faudra d\u00e9sormais attendre 2020… (SpaceX)<\/figcaption><\/figure>\n

C\u00f4t\u00e9 entreprise priv\u00e9e et donc SpaceX d\u2019Elon Musk, c\u2019est aussi un glissement de calendrier qui a d\u00e9j\u00e0 \u00e9t\u00e9 annonc\u00e9 pour le vol\u2014tr\u00e8s audacieux\u2014vers Mars d\u2019une cabine inhabit\u00e9e Dragon, cens\u00e9e se poser sur la plan\u00e8te rouge apr\u00e8s freinage r\u00e9trofus\u00e9e en mode supersonique, ce qui n\u2019a jamais \u00e9t\u00e9 tent\u00e9 auparavant. Annonc\u00e9 d’abord pour 2018, on sait que le vol a \u00e9t\u00e9 report\u00e9 \u00e0 la fen\u00eatre de tir suivante de 2020. Outre les retards pris par SpaceX dans le d\u00e9veloppement de sa fus\u00e9e Heavy Falcon qui sera utilis\u00e9e \u00e0 l\u2019occasion et qui n\u2019a toujours pas vol\u00e9\u00a0(on parle aujourd\u2019hui de la mi-septembre), l\u2019entreprise d\u2019Elon Musk a accumul\u00e9 les retards sur d\u2019autres projets comme la mise au point de la cabine Dragon elle-m\u00eame pour des vols pilot\u00e9s vers la Station spatiale Internationale, avec pour client la NASA. Celle-ci met la pression sur SpaceX pour que leur commande soit prioritaire.<\/p>\n

Pour que la pilule passe aupr\u00e8s des fans martiens, des rumeurs sugg\u00e8rent que pour compenser le glissement, ce sont deux Dragons plut\u00f4t qu\u2019un qui partiront vers Mars en 2020. Un seul, ce serait d\u00e9j\u00e0 pas mal\u2026<\/p>\n","protected":false},"excerpt":{"rendered":"

Volont\u00e9 de ne pas courir trop de li\u00e8vres \u00e0 la fois et retards techniques pris par les principaux constructeurs de fus\u00e9es font que le calendrier des grands travaux martiens, pour pr\u00e9parer une mission habit\u00e9e, a gliss\u00e9 d\u2019au moins deux ans. Les observateurs d\u00e9sabus\u00e9s pourront commenter que c\u2019est d\u00e9sormais la routine\u2026 Emp\u00eatr\u00e9e dans un programme sans … Continuer la lecture de Reports en cascade<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[13,4],"tags":[],"class_list":["post-634","post","type-post","status-publish","format-standard","hentry","category-actualites","category-sciences"],"yoast_head":"\nReports en cascade - Carnets de bord d\u2019un martien, le blog de Charles FRANKEL, g\u00e9ologue<\/title>\n<meta name=\"description\" content=\"Le premier vol de fus\u00e9e "lunaire" SLS (NASA) est report\u00e9 de 2018 \u00e0 2019. 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