{"id":3678,"date":"2015-09-29T05:04:16","date_gmt":"2015-09-29T05:04:16","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=3678"},"modified":"2015-10-06T04:46:41","modified_gmt":"2015-10-06T04:46:41","slug":"la-planete-mercure-tourne-plus-vite-que-prevu","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/09\/29\/la-planete-mercure-tourne-plus-vite-que-prevu\/","title":{"rendered":"La plan\u00e8te Mercure tourne plus vite que pr\u00e9vu"},"content":{"rendered":"

L’analyse des donn\u00e9es de la sonde Messenger a r\u00e9v\u00e9l\u00e9 que Mercure tourne sur elle-m\u00eame 9 sec plus vite que pr\u00e9vu, peut-\u00eatre \u00e0 cause de Jupiter.<\/strong><\/p>\n

La sonde am\u00e9ricaine\u00a0Messenger<\/a>, initialement con\u00e7ue pour une mission d’un an autour de Mercure<\/a>, a finalement pass\u00e9 4 ans (de mars 2011 jusqu’\u00e0 sa chute finale <\/a>en avril 2015) et r\u00e9alis\u00e9 plusieurs milliers d’orbites autour de la premi\u00e8re plan\u00e8te du Syst\u00e8me solaire.<\/p>\n

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

La surface de Mercure r\u00e9v\u00e9l\u00e9e en fausses couleurs <\/strong>par la sonde am\u00e9ricaine Messenger<\/strong><\/p>\n

Jusqu’\u00e0 l’arriv\u00e9e de Messenger, Mercure <\/a>\u00e9tait la moins bien connue des plan\u00e8tes, n’ayant re\u00e7u la visite que d’une seule sonde, Mariner 10 dans les ann\u00e9es 1970. C’est dire comme les observations accumul\u00e9es par Messenger vont faire \u00e9voluer l’image que nous avons de ce corps c\u00e9leste.<\/p>\n

C’est \u00e0 l’occasion du congr\u00e8s annuel de l’Union am\u00e9ricaine de g\u00e9ophysique<\/a> que Jean-Luc Margot<\/a>, chercheur \u00e0 l’Universit\u00e9 de Californie<\/a>, a pr\u00e9sent\u00e9 les r\u00e9sultats d’une nouvelle \u00e9tude sur la vitesse de rotation de Mercure<\/a>. En utilisant les donn\u00e9es enregistr\u00e9es par l’altim\u00e8tre laser et la cam\u00e9ra haute r\u00e9solution de la sonde Messenger, le chercheur et ses coll\u00e8gues ont calcul\u00e9 le temps que mettait Mercure \u00e0 faire un tour sur elle-m\u00eame : l’\u00e9quivalent de\u00a058,6462 jours terrestres, soit 9 sec de moins que la vitesse estim\u00e9e jusqu’\u00e0 pr\u00e9sent.<\/p>\n

On savait d\u00e9j\u00e0 que Mercure ne tourne pas sur son axe de fa\u00e7on r\u00e9guli\u00e8re, mais qu’elle subit des fluctuations selon un cycle de 88 jours, le temps qu’elle met \u00e0 faire le tour du Soleil<\/a>\u00a0(l’attraction gravitationnelle de notre \u00e9toile acc\u00e9l\u00e8re ou ralentit la rotation de Mercure). Mais ces oscillations ne suffisent pas \u00e0 expliquer le d\u00e9calage de 9 sec. L’\u00e9quipe de scientifiques autour de Jean-Luc Margot a cherch\u00e9 si un autre corps c\u00e9leste que le Soleil pourrait avoir une influence sur Mercure : seule Jupiter<\/a>, malgr\u00e9 sa distance, semble assez massive pour jouer ce r\u00f4le.<\/p>\n","protected":false},"excerpt":{"rendered":"

L’analyse des donn\u00e9es de la sonde Messenger a r\u00e9v\u00e9l\u00e9 que Mercure tourne sur elle-m\u00eame 9 sec plus vite que pr\u00e9vu, peut-\u00eatre \u00e0 cause de Jupiter. La sonde am\u00e9ricaine\u00a0Messenger, initialement con\u00e7ue pour une mission d’un an autour de Mercure, a finalement pass\u00e9 4 ans (de mars 2011 jusqu’\u00e0 sa chute finale en avril 2015) et r\u00e9alis\u00e9 … Continuer la lecture de La plan\u00e8te Mercure tourne plus vite que pr\u00e9vu<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":3777,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[1249,90,140,114,559,1248],"class_list":["post-3678","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-jean-luc-margot","tag-jupiter","tag-mercure","tag-planete","tag-sonde-messenger","tag-union-americaine-de-geophysique"],"yoast_head":"\nLa plan\u00e8te Mercure tourne plus vite que pr\u00e9vu<\/title>\n<meta name=\"description\" content=\"L'analyse des 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