{"id":7949,"date":"2017-06-22T16:35:52","date_gmt":"2017-06-22T16:35:52","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=7949"},"modified":"2017-07-05T05:18:35","modified_gmt":"2017-07-05T05:18:35","slug":"pour-new-horizons-les-astronomes-traquent-2014-mu69","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/06\/22\/pour-new-horizons-les-astronomes-traquent-2014-mu69\/","title":{"rendered":"Pour New Horizons, les astronomes traquent 2014 MU69"},"content":{"rendered":"

Trois occultations d’\u00e9toiles par 2014 MU69 devraient permettre d’en savoir un peu plus sur ce petit corps que survolera la sonde New Horizons<\/em> en 2019.<\/strong><\/p>\n

Le 24 juin 2014 la cam\u00e9ra \u00e0 large champ (WFC3) du t\u00e9lescope spatial Hubble<\/a> d\u00e9couvrait 2014 MU69, un petit corps rocheux dont la taille est estim\u00e9e \u00e0 40 km. Tr\u00e8s faiblement lumineux (magnitude<\/a> 26,8), cet objet se situe \u00e0 plus de 43 Unit\u00e9s Astronomiques du Soleil<\/a> dans la ceinture de Kuiper. Cette derni\u00e8re ressemble \u00e0 la ceinture d’ast\u00e9ro\u00efdes situ\u00e9e entre Mars<\/a> et Jupiter<\/a> mais se trouve beaucoup plus loin, au del\u00e0 de l’orbite de Neptune<\/a>.<\/p>\n

\"\"<\/a><\/p>\n

2014 MU69 a \u00e9t\u00e9 choisi pour recevoir la visite de New Horizons<\/em><\/a> le 1er janvier 2019. \u00a0Les astronomes aimeraient bien que la sonde qui a survol\u00e9 la plan\u00e8te naine Pluton<\/a> et son compagnon Charon en 2015 leur permette d’en apprendre un peu plus sur les corps qui constituent la ceinture de Kuiper. On peut en effet imaginer que leur composition est rest\u00e9e inchang\u00e9e depuis la formation du Syst\u00e8me solaire.\u00a0\u00a0<\/p>\n

Les 3 juin, 10 juillet et 17 juillet, 2014 MU69 occulte trois \u00e9toiles diff\u00e9rentes. En se pla\u00e7ant judicieusement, des observateurs pourraient enregistrer la br\u00e8ve chute de lumi\u00e8re de l’\u00e9toile occult\u00e9e (pendant environ 2 sec) et en tirer des informations int\u00e9ressantes. C’est ce qu’a d\u00e9cid\u00e9 de faire un groupe d’astronomes<\/a> au sein de l’\u00e9quipe de New Horizons<\/em> : utilisant des t\u00e9lescopes<\/a> fixes et d’autres mobiles de 40 cm de diam\u00e8tre (photo ci-dessus), ils seront une cinquantaine \u00e0 se d\u00e9ployer tout les 10 \u00e0 25 km le long des 3 lignes d’occultation.<\/p>\n

Pour Alan Stern, l’un des responsables de de cette \u00e9quipe de chercheurs, l’objectif de ces campagnes d’observations\u00a0est de d\u00e9terminer s’il y a des des anneaux, de la poussi\u00e8re ou m\u00eame des satellites autour de 2014 MU69, ce qui n\u00e9cessiterait de modifier la trajectoire d’approche de la sonde. L’analyse des courbes de lumi\u00e8re permettrait \u00e9galement d’en apprendre davantage sur l’orbite, la taille et la forme de ce petit corps rocheux.<\/p>\n

On peut suivre cette campagne d’observations sur le compte Twitter de la mission<\/a>.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Trois occultations d’\u00e9toiles par 2014 MU69 devraient permettre d’en savoir un peu plus sur ce petit corps que survolera la sonde New Horizons en 2019. Le 24 juin 2014 la cam\u00e9ra \u00e0 large champ (WFC3) du t\u00e9lescope spatial Hubble d\u00e9couvrait 2014 MU69, un petit corps rocheux dont la taille est estim\u00e9e \u00e0 40 km. Tr\u00e8s … Continuer la lecture de Pour New Horizons, les astronomes traquent 2014 MU69<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":7951,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[2003,2244,631,626,1156,625,544],"class_list":["post-7949","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-2014-mu69","tag-astronomes","tag-ceinture-de-kuiper","tag-charon","tag-new-horizons","tag-pluton","tag-telescope-spatial-hubble"],"yoast_head":"\nPour New Horizons, les astronomes traquent 2014 MU69<\/title>\n<meta name=\"description\" content=\"Trois occultations d'\u00e9toiles par 2014 MU69 devraient permettre d'en savoir un peu plus sur ce petit corps que survolera la sonde New Horizons en 2019.\" \/>\n<meta name=\"robots\" content=\"index, follow, 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