{"id":5084,"date":"2021-04-24T14:24:49","date_gmt":"2021-04-24T14:24:49","guid":{"rendered":"https:\/\/www.africa-press.net\/tchad\/?p=5084"},"modified":"2021-04-24T14:21:16","modified_gmt":"2021-04-24T14:21:16","slug":"mars-lhelicoptere-ingenuity-de-la-nasa-a-reussi-le-tout-premier-vol-sur-une-autre-planete","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/mars-lhelicoptere-ingenuity-de-la-nasa-a-reussi-le-tout-premier-vol-sur-une-autre-planete","title":{"rendered":"Mars : l\u2019h\u00e9licopt\u00e8re Ingenuity de la Nasa a r\u00e9ussi le tout premier vol sur une autre plan\u00e8te"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong><a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a> &#8211; <a href=\"https:\/\/www.africa-press.net\/tchad\">Tchad<\/a>. <\/strong><\/span>Il ne s\u2019est \u00e9lev\u00e9 qu\u2019\u00e0 3 m\u00e8tres de la surface de Mars, mais c\u2019est un bond de g\u00e9ant dans l\u2019histoire de l\u2019exploration spatiale. L\u2019h\u00e9licopt\u00e8re Ingenuity a r\u00e9ussi le tout premier vol sur une autre plan\u00e8te, ce 19 avril 2021.<\/p>\n<p>En quelques secondes, Ingenuity a r\u00e9alis\u00e9 un progr\u00e8s historique dans l\u2019histoire de l\u2019exploration spatiale. Ce lundi 19 avril 2021, la Nasa a confirm\u00e9 lors d\u2019un \u00e9v\u00e9nement diffus\u00e9 en direct que son petit h\u00e9licopt\u00e8re \u00e9tait parvenu \u00e0 voler sur Mars. Le vol a eu lieu aux alentours de 9h30, mais il a fallu patienter quelques heures pour que les premi\u00e8res donn\u00e9es parviennent aux \u00e9quipes.<\/p>\n<p>Ce premier essai de vol \u00e9tait tr\u00e8s attendu, mais la Nasa a avait \u00e9t\u00e9 contrainte d\u2019en d\u00e9caler la date. Initialement pr\u00e9vue pour le 11 avril, l\u2019\u00e9ch\u00e9ance a d\u00fb \u00eatre report\u00e9e en raison d\u2019un souci rencontr\u00e9 pendant une s\u00e9quence de tests de rotation des pales \u00e0 pleine vitesse (qui s\u2019\u00e9tait achev\u00e9e pr\u00e9matur\u00e9ment). Un nouveau test de rotation rapide a pu \u00eatre men\u00e9 sans probl\u00e8me, a fait savoir l\u2019agence spatiale le 17 avril. Peu apr\u00e8s, la Nasa a arr\u00eat\u00e9 son choix sur la date du 19 avril pour tenter de faire d\u00e9coller son h\u00e9lico martien.<\/p>\n<p><b>L\u2019H\u00c9LICO S\u2019EST \u00c9LEV\u00c9 \u00c0 3 M\u00c8TRES D\u2019ALTITUDE<\/b><\/p>\n<p>Le tout premier vol men\u00e9 par Ingenuity peut sembler bien modeste, \u00e0 premi\u00e8re vue. Lors de son envol, il \u00e9tait pr\u00e9vu que l\u2019h\u00e9licopt\u00e8re atteigne une altitude maximale de 3 m\u00e8tres. Il devait \u00e9galement s\u2019\u00e9lever \u00e0 la vitesse de 1 m\u00e8tre par seconde, planer pendant une vingtaine de secondes, avant de se reposer. Aucun d\u00e9placement horizontal n\u2019a eu lieu. Pourtant, c\u2019est d\u00e9j\u00e0 un \u00e9norme d\u00e9fi pour un petit h\u00e9licopt\u00e8re de voler ainsi sur Mars. Il a fallu concevoir un engin \u00e0 la fois l\u00e9ger, autonome et r\u00e9sistant au froid (la nuit, il peut faire jusqu\u2019\u00e0 -90\u00b0C en surface dans le crat\u00e8re Jezero, o\u00f9 s\u2019est pos\u00e9e la mission Mars 2020).<\/p>\n<p>Pour assister aux activit\u00e9s de son compagnon, le rover Perseverance stationne \u00e0 une distance d\u2019environ 100 m\u00e8tres. De son emplacement, il peut obtenir des images d\u2019Ingenuity, tout en restant en s\u00e9curit\u00e9 si jamais la mission de l\u2019h\u00e9lico est un \u00e9chec. Ingenuity sert avant tout de d\u00e9monstration technologique du vol sur Mars : pour la Nasa, il serait impensable que le rover, qui reste l\u2019acteur principal de la mission, soit perturb\u00e9 de quelque fa\u00e7on que ce soit par l\u2019h\u00e9licopt\u00e8re. Il reste cependant assez proche pour assurer les communications radio avec Ingenuity : l\u2019astromobile sert de relais pour transmettre les donn\u00e9es de l\u2019h\u00e9licopt\u00e8re vers la Terre.<\/p>\n<p><b>ET ENSUITE ?<\/b><\/p>\n<p>Et maintenant que la Nasa a re\u00e7u la confirmation qu\u2019Ingenuity a vol\u00e9, que va-t-il se passer ? \u00c9tant donn\u00e9 les d\u00e9lais de communication entre Mars et la Terre, on peut s\u2019attendre \u00e0 ce que l\u2019agence spatiale pr\u00e9sente progressivement des images de ce premier vol. Perseverance devrait envoyer peu \u00e0 peu ses images du vol, et relayer \u00e9galement celles prises par Ingenuity, qui est \u00e9quip\u00e9 de deux cam\u00e9ras \u00e0 son bord. Un briefing est d\u2019ores et d\u00e9j\u00e0 pr\u00e9vu ce 19 avril \u00e0 20h, afin d\u2019\u00e9voquer les r\u00e9sultats de ce premier vol plus en d\u00e9tail.<\/p>\n<p>Quant \u00e0 la suite de la mission de l\u2019h\u00e9licopt\u00e8re, la Nasa a d\u00e9j\u00e0 envisag\u00e9 que d\u2019autres vols pourraient suivre cette premi\u00e8re tentative. Au maximum, jusqu\u2019\u00e0 5 vols sont possibles, sous r\u00e9serve de disposer d\u2019assez de temps et sur la base des r\u00e9sultats des vols pr\u00e9c\u00e9dents. Si tout se passe bien, l\u2019agence pourrait d\u00e9cider de faire monter Ingenuity plus haut (jusqu\u2019\u00e0 5 m\u00e8tres d\u2019altitude), de le faire voler \u00e0 l\u2019horizontale sur quelques m\u00e8tres, avec des vols plus longs (jusqu\u2019\u00e0 90 secondes).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Tchad. Il ne s\u2019est \u00e9lev\u00e9 qu\u2019\u00e0 3 m\u00e8tres de la surface de Mars, mais c\u2019est un bond de g\u00e9ant dans l\u2019histoire de l\u2019exploration spatiale. L\u2019h\u00e9licopt\u00e8re Ingenuity a r\u00e9ussi le tout premier vol sur une autre plan\u00e8te, ce 19 avril 2021. En quelques secondes, Ingenuity a r\u00e9alis\u00e9 un progr\u00e8s historique dans l\u2019histoire de l\u2019exploration [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":5083,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,11,10],"tags":[37,292,29],"class_list":["post-5084","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-homepage-french","category-toutes-les-actualites","tag-africa-press","tag-africa-press-tchad","tag-tchad"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Mars : l\u2019h\u00e9licopt\u00e8re Ingenuity de la Nasa a r\u00e9ussi le tout premier vol sur une autre plan\u00e8te - tchad<\/title>\n<meta name=\"description\" content=\"Il ne s\u2019est \u00e9lev\u00e9 qu\u2019\u00e0 3 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