{"id":11219,"date":"2022-09-26T18:30:03","date_gmt":"2022-09-26T16:30:03","guid":{"rendered":"https:\/\/www.culturalusa.com\/news\/?p=11219"},"modified":"2022-09-26T18:30:03","modified_gmt":"2022-09-26T16:30:03","slug":"le-vaisseau-de-la-nasa-pret-a-secraser-sur-un-asteroide-pour-devier-sa-trajectoire","status":"publish","type":"post","link":"https:\/\/www.culturalusa.com\/news\/monde\/le-vaisseau-de-la-nasa-pret-a-secraser-sur-un-asteroide-pour-devier-sa-trajectoire\/","title":{"rendered":"Le vaisseau de la Nasa pr\u00eat \u00e0 s&rsquo;\u00e9craser sur un ast\u00e9ro\u00efde pour d\u00e9vier sa trajectoire"},"content":{"rendered":"<p>Les dinosaures auraient s\u00fbrement aim\u00e9 y penser. Les films de science-fiction, \u00e0 l&rsquo;image d'\u00a0\u00bbArmageddon\u00a0\u00bb ou plus r\u00e9cemment de \u00ab\u00a0Don&rsquo;t Look Up: D\u00e9ni cosmique\u00a0\u00bb, l&rsquo;envisagent eux depuis longtemps.<\/p>\n<blockquote><p>Cette fois, la Nasa va enfin tenter ce qui n&rsquo;a jamais \u00e9t\u00e9 fait auparavant: d\u00e9vier la trajectoire d&rsquo;un ast\u00e9ro\u00efde en projetant sur lui un vaisseau kamikaze. Un test de \u00ab\u00a0d\u00e9fense plan\u00e9taire\u00a0\u00bb, qui doit permettre de mieux prot\u00e9ger l&rsquo;humanit\u00e9 face \u00e0 une \u00e9ventuelle menace future.<\/p><\/blockquote>\n<p>La mission Dart (fl\u00e9chette, en anglais) a d\u00e9coll\u00e9 en novembre depuis la Californie. Apr\u00e8s dix mois de voyage, le vaisseau doit frapper l&rsquo;ast\u00e9ro\u00efde Dimorphos \u00e0 23H14 GMT lundi, \u00e0 une vitesse de plus de 20.000 km\/h.<\/p>\n<p>Le vaisseau n&rsquo;est pas plus grand qu&rsquo;une voiture, et sa cible fait environ 160 m\u00e8tres de diam\u00e8tre (la moiti\u00e9 de la hauteur de la Tour Eiffel).<\/p>\n<p>Pas de panique, Dimorphos ne repr\u00e9sente en aucun cas une menace pour la Terre: son orbite autour du Soleil ne passe qu&rsquo;\u00e0 sept millions de kilom\u00e8tres de nous au plus proche.<\/p>\n<p>Mais la mission \u00ab\u00a0est importante \u00e0 r\u00e9aliser avant que nous ne d\u00e9couvrions un r\u00e9el besoin\u00a0\u00bb, a d\u00e9clar\u00e9 Andrea Riley, charg\u00e9 de la mission \u00e0 la Nasa.<\/p>\n<p>Le moment de l&rsquo;impact s&rsquo;annonce spectaculaire et pourra \u00eatre suivi en direct sur la cha\u00eene vid\u00e9o de l&rsquo;agence am\u00e9ricaine.<\/p>\n<h3>Il ne s&rsquo;agit pas de d\u00e9truire l&rsquo;ast\u00e9ro\u00efde mais de le pousser l\u00e9g\u00e8rement. La technique est dite \u00e0 impact cin\u00e9tique.<\/h3>\n<p>Dimorphos est en r\u00e9alit\u00e9 le satellite d&rsquo;un plus gros ast\u00e9ro\u00efde, Didymos (780 m\u00e8tres de diam\u00e8tre), dont il fait le tour en 11 heures et 55 minutes.<\/p>\n<p>Le but est de r\u00e9duire l&rsquo;orbite de Dimorphos autour de Didymos d&rsquo;environ dix minutes.<\/p>\n<p>Ce changement pourra \u00eatre mesur\u00e9 par des t\u00e9lescopes depuis la Terre, en observant la variation de l&rsquo;\u00e9clat lorsque le petit ast\u00e9ro\u00efde passe devant le gros.<\/p>\n<p>L&rsquo;objectif peut para\u00eetre modeste mais cette d\u00e9monstration est cruciale pour l&rsquo;avenir.<\/p>\n<p>Il s&rsquo;agit de mieux comprendre comment r\u00e9agira Dimorphos, repr\u00e9sentatif d&rsquo;une population d&rsquo;ast\u00e9ro\u00efde assez communs mais dont on ne conna\u00eet pas la composition exacte. L&rsquo;effet de l&rsquo;impact d\u00e9pendra en grande partie de sa porosit\u00e9, c&rsquo;est-\u00e0-dire s&rsquo;il est plus ou moins compact.<\/p>\n<h3>Une image par seconde<\/h3>\n<p>Pour atteindre une cible si petite, le vaisseau se dirigera de fa\u00e7on autonome durant les quatre derni\u00e8res heures, comme un missile auto-guid\u00e9.<\/p>\n<p>Sa cam\u00e9ra, appel\u00e9e Draco, prendra au dernier moment les toutes premi\u00e8res images de l&rsquo;ast\u00e9ro\u00efde, dont on ne conna\u00eet pas encore la forme (ronde, oblongue&#8230;). A un rythme d&rsquo;une image par seconde, visibles en direct sur Terre avec un d\u00e9lai de seulement quelque 45 secondes.<\/p>\n<p>\u00ab\u00a0Cela va commencer par un petit point de lumi\u00e8re, jusqu&rsquo;\u00e0 remplir tout le cadre\u00a0\u00bb, a d\u00e9clar\u00e9 Nancy Chabot, du Laboratoire de physique appliqu\u00e9e (APL) de l&rsquo;universit\u00e9 Johns Hopkins, o\u00f9 se trouve le centre de contr\u00f4le.<\/p>\n<p>\u00ab\u00a0Ces images continueront \u00e0 arriver, jusqu&rsquo;\u00e0 ce qu&rsquo;elles n&rsquo;arrivent plus\u00a0\u00bb, a-t-elle ajout\u00e9, en r\u00e9f\u00e9rence au moment de l&rsquo;explosion.<\/p>\n<p>Trois minutes plus tard, un satellite de la taille d&rsquo;une bo\u00eete \u00e0 chaussures, appel\u00e9 LICIACube et rel\u00e2ch\u00e9 par le vaisseau il y a quelques jours, passera \u00e0 environ 55 km de l&rsquo;ast\u00e9ro\u00efde pour capturer des images des \u00e9jecta. Elles seront renvoy\u00e9es vers la Terre dans les semaines et mois suivants.<\/p>\n<p>L&rsquo;\u00e9v\u00e9nement sera \u00e9galement observ\u00e9 par les t\u00e9lescopes spatiaux Hubble et James Webb, qui devraient pouvoir d\u00e9tecter un nuage de poussi\u00e8re brillant.<\/p>\n<p>Puis, la sonde europ\u00e9enne Hera, qui doit d\u00e9coller en 2024, ira observer de pr\u00e8s Dimorphos en 2026 pour \u00e9valuer les cons\u00e9quences de l&rsquo;impact et calculer, pour la premi\u00e8re fois, la masse de l&rsquo;ast\u00e9ro\u00efde.<\/p>\n<h3>Trouvez-les tous<\/h3>\n<p>Tr\u00e8s peu des ast\u00e9ro\u00efdes connus sont consid\u00e9r\u00e9s comme potentiellement dangereux, et aucun ne l&rsquo;est sur les 100 prochaines ann\u00e9es.<\/p>\n<p>Mais \u00ab\u00a0je garantis que si vous attendez assez longtemps, il y aura un objet\u00a0\u00bb, a d\u00e9clar\u00e9 Thomas Zurbuchen, chef scientifique de la Nasa.<\/p>\n<p>Pr\u00e8s de 30.000 ast\u00e9ro\u00efdes de toutes tailles ont \u00e9t\u00e9 catalogu\u00e9s dans les environs de la Terre (on les appelle des g\u00e9ocroiseurs, c&rsquo;est-\u00e0-dire que leur orbite croise celle de notre plan\u00e8te). Environ 3.000 nouveaux sont trouv\u00e9s chaque ann\u00e9e.<\/p>\n<p>Ceux d&rsquo;un kilom\u00e8tre et plus ont quasiment tous \u00e9t\u00e9 rep\u00e9r\u00e9s, selon les scientifiques. Mais ils estiment n&rsquo;avoir connaissance que de 40 % des ast\u00e9ro\u00efdes mesurant 140 m\u00e8tres et plus &#8211;ceux capables de d\u00e9vaster une r\u00e9gion enti\u00e8re.<\/p>\n<p>Si Dart manque sa cible, le vaisseau devrait avoir assez de carburant pour une nouvelle tentative dans deux ans.<\/p>\n<p>Et si la mission r\u00e9ussit, il s&rsquo;agira d&rsquo;un premier pas vers une v\u00e9ritable capacit\u00e9 de d\u00e9fense, selon Nancy Chabot. \u00ab\u00a0La Terre est frapp\u00e9e par des ast\u00e9ro\u00efdes depuis des milliards d&rsquo;ann\u00e9es, et cela se reproduira. En tant qu&rsquo;humains, faisons en sorte de vivre dans une civilisation o\u00f9 nous pouvons l&rsquo;\u00e9viter.\u00a0\u00bb (AFP)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les dinosaures auraient s\u00fbrement aim\u00e9 y penser. Les films de science-fiction, \u00e0 l&rsquo;image d&rsquo;\u00a0\u00bbArmageddon\u00a0\u00bb ou plus r\u00e9cemment de \u00ab\u00a0Don&rsquo;t Look Up: D\u00e9ni cosmique\u00a0\u00bb, l&rsquo;envisagent eux depuis longtemps. Cette fois, la Nasa va enfin tenter ce qui n&rsquo;a jamais \u00e9t\u00e9 fait auparavant: d\u00e9vier la trajectoire d&rsquo;un ast\u00e9ro\u00efde en projetant sur lui un vaisseau kamikaze. Un test [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":11220,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1372],"tags":[411,2465],"class_list":["post-11219","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-monde","tag-asteroide","tag-vaisseau-de-la-nasa"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.9 - aioseo.com -->\n\t<meta name=\"description\" content=\"Les dinosaures auraient s\u00fbrement aim\u00e9 y penser. Les films de science-fiction, \u00e0 l&#039;image d&#039;&quot;Armageddon&quot; ou plus r\u00e9cemment de &quot;Don&#039;t Look Up: D\u00e9ni cosmique&quot;, l&#039;envisagent eux depuis longtemps. Cette fois, la Nasa va enfin tenter ce qui n&#039;a jamais \u00e9t\u00e9 fait auparavant: d\u00e9vier la trajectoire d&#039;un ast\u00e9ro\u00efde en projetant sur lui un vaisseau kamikaze. 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