{"id":8881,"date":"2019-06-27T05:04:22","date_gmt":"2019-06-27T05:04:22","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=8881"},"modified":"2019-07-08T07:02:51","modified_gmt":"2019-07-08T07:02:51","slug":"zoom-sur-pierazzo-un-cratere-lunaire-de-la-face-cachee","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/06\/27\/zoom-sur-pierazzo-un-cratere-lunaire-de-la-face-cachee\/","title":{"rendered":"J-15 : zoom sur Pierazzo, un crat\u00e8re lunaire de la face cach\u00e9e"},"content":{"rendered":"

En photographiant des d\u00e9tails sur la face cach\u00e9e de la Lune,\u00a0la sonde am\u00e9ricaine Lunar Reconnaissance Orbiter<\/em> nous d\u00e9voile en d\u00e9tail le crat\u00e8re Pierazzo.<\/strong><\/p>\n

15 jours avant On The Moon Again<\/a>, je vous propose de faire un petit tour du c\u00f4t\u00e9 obscur de notre satellite naturel. Invisible depuis la Terre, la face cach\u00e9e r\u00e9v\u00e8le ses reliefs aux orbiteurs lunaires.<\/p>\n

Lanc\u00e9e le 18 juin 2009 (au cours de l\u2019Ann\u00e9e mondiale de l\u2019astronomie<\/a>), LRO (Lunar Reconnaissance orbiter<\/a><\/em>) est une sonde d\u2019environ 2 tonnes qui a \u00e9t\u00e9 plac\u00e9e en orbite \u00e0 moins de 50 km de la\u00a0Lune\u00a0<\/a>pour en \u00e9tudier la surface de fa\u00e7on approfondie. Sa cam\u00e9ra haute r\u00e9solution (LROC) a m\u00eame \u00e9t\u00e9 capable de nous r\u00e9v\u00e9ler\u00a0les sites d\u2019atterrissage d\u2019Apollo<\/a>. Cette fois-ci c’est Pierazzo qui est \u00e0 l’honneur, un crat\u00e8re d’impact d’un peu plus de 9 kilom\u00e8tres de diam\u00e8tre situ\u00e9 sur la face cach\u00e9e.<\/p>\n

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

Ce crat\u00e8re a \u00e9t\u00e9 nomm\u00e9 en 2015 par l’UAI<\/a> (Union Astronomique Internationale) en l’honneur de\u00a0la plan\u00e9tologue italienne Elisabetta Pierazzo (1963-2011) sp\u00e9cialiste des crat\u00e8res d’impact.\u00a0<\/p>\n

Pourquoi la Lune a-t-elle une face cach\u00e9e ? C’est tout simplement parce que sa p\u00e9riode de rotation est \u00e9gale \u00e0 sa p\u00e9riode de r\u00e9volution (un peu plus de 27 jours). Il y a des millions d’ann\u00e9es notre satellite naturel tournait beaucoup plus vite, mais les forces de mar\u00e9e qui s’exercent entre la Terre et la Lune ont ralenti notre voisine qui d\u00e9sormais fait un tour sur elle-m\u00eame en m\u00eame temps qu’elle fait un tour autour de la Terre. Les premiers hommes \u00e0 avoir d\u00e9couvert la face cach\u00e9e de la Lune sont les membres d’\u00e9quipage d’Apollo 8<\/a> qui ont contourn\u00e9 notre satellite en 1968. C’est d\u00e9sormais la sonde LRO qui nous en envoie des images.<\/p>\n

\"\"<\/a>
Tycho est le plus c\u00e9l\u00e8bre exemple de crat\u00e8re lunaire rayonnant que l’on peut admirer sur la face visible avec une simple paire de jumelles. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n

Comme de nombreux crat\u00e8res sur la face visible (voir par exemple Tycho\u00a0<\/a>ou Copernic<\/a>), Pierazzo pr\u00e9sente un rayonnement qui s’\u00e9tend sur plus de 100 kilom\u00e8tres dans toutes les directions autour du point d’impact, des \u00e9jectas qui ont \u00e9t\u00e9 form\u00e9s au moment o\u00f9 l’ast\u00e9ro\u00efde a frapp\u00e9 la surface lunaire. Sur cette image propos\u00e9e par la NASA<\/a> on remarque des traces sombres sur les parois du crat\u00e8re : il s’agit de roches vitrifi\u00e9es par la puissance de l’impact qui se sont \u00e9coul\u00e9es avant de se figer sous la forme de d\u00e9p\u00f4ts vitreux sombres.<\/p>\n

L’angle du clich\u00e9 de Pierazzo acquis par la sonde\u00a0Lunar Reconnaissance Orbiter<\/em> d\u00e9but d\u00e9cembre 2017 est comparable \u00e0 la vision que nous pourrions avoir d’un crat\u00e8re terrestre depuis un avion, mais l’atmosph\u00e8re terrestre ne nous permettrait pas d’avoir une vue aussi nette de cette formation g\u00e9ologique !<\/p>\n

Si vous avez envie de d\u00e9couvrir la Lune (la face visible bien s\u00fbr), CIELMANIA vous propose r\u00e9guli\u00e8rement des paysages lunaires \u00e0 explorer<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

En photographiant des d\u00e9tails sur la face cach\u00e9e de la Lune,\u00a0la sonde am\u00e9ricaine Lunar Reconnaissance Orbiter nous d\u00e9voile en d\u00e9tail le crat\u00e8re Pierazzo. 15 jours avant On The Moon Again, je vous propose de faire un petit tour du c\u00f4t\u00e9 obscur de notre satellite naturel. Invisible depuis la Terre, la face cach\u00e9e r\u00e9v\u00e8le ses reliefs … Continuer la lecture de J-15 : zoom sur Pierazzo, un crat\u00e8re lunaire de la face cach\u00e9e<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":8882,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[83],"tags":[2455,2454,1283,82,2632,2456],"class_list":["post-8881","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-la-lune","tag-cratere-pierazzo","tag-elisabetta-pierazzo","tag-lro","tag-lune","tag-on-the-moon","tag-uai"],"yoast_head":"\nJ-15 : zoom sur Pierazzo, un crat\u00e8re lunaire de la face cach\u00e9e<\/title>\n<meta name=\"description\" content=\"En photographiant des d\u00e9tails sur la face cach\u00e9e de la Lune,\u00a0la sonde am\u00e9ricaine Lunar Reconnaissance Orbiter nous d\u00e9voile en d\u00e9tail le crat\u00e8re Pierazzo.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/06\/27\/zoom-sur-pierazzo-un-cratere-lunaire-de-la-face-cachee\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"J-15 : zoom sur Pierazzo, un crat\u00e8re lunaire de la face cach\u00e9e\" \/>\n<meta property=\"og:description\" content=\"En photographiant des d\u00e9tails sur la face cach\u00e9e de la Lune,\u00a0la sonde am\u00e9ricaine Lunar Reconnaissance Orbiter nous d\u00e9voile en d\u00e9tail le crat\u00e8re Pierazzo.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/06\/27\/zoom-sur-pierazzo-un-cratere-lunaire-de-la-face-cachee\/\" \/>\n<meta property=\"og:site_name\" content=\"CIELMANIA : le blog de 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