{"id":15378,"date":"2022-06-03T15:37:19","date_gmt":"2022-06-03T15:37:19","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=15378"},"modified":"2022-06-12T15:36:20","modified_gmt":"2022-06-12T15:36:20","slug":"partez-a-la-decouverte-des-crateres-lunaires-jumeaux-messier","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/06\/03\/partez-a-la-decouverte-des-crateres-lunaires-jumeaux-messier\/","title":{"rendered":"Observation lunaire : d\u00e9couvrez les crat\u00e8res jumeaux Messier"},"content":{"rendered":"<p><strong>Parmi les formations lunaires qui suscitent encore des interrogations, les crat\u00e8res Messier tiennent une place de choix.<\/strong><\/p>\n<h5>Un nom \u00e9vocateur :<\/h5>\n<p>Quand on parle de Messier, on pense d&#8217;abord au c\u00e9l\u00e8bre <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/astronomie-astronomie-catalogue-messier-250-ans-16597\/\" target=\"_blank\" rel=\"noopener\">catalogue<\/a> qui recense les principaux objets n\u00e9buleux du ciel nocturne. Ce qu&#8217;on sait moins, c&#8217;est que l&#8217;astronome fran\u00e7ais Charles Messier (1730-1817) a \u00e9galement son nom sur la Lune. Tous les possesseurs d&#8217;une lunette astronomique ont d\u00e9j\u00e0 observ\u00e9 une curieuse formation dans la Mer de la F\u00e9condit\u00e9 :<\/p>\n<figure id=\"attachment_15380\" aria-describedby=\"caption-attachment-15380\" style=\"width: 444px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/carte_lune_messier.jpg\" rel=\"lightbox[15378]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15380\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/carte_lune_messier-444x450.jpg\" alt=\"\" width=\"444\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/carte_lune_messier-444x450.jpg 444w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/carte_lune_messier.jpg 691w\" sizes=\"auto, (max-width: 444px) 100vw, 444px\" \/><\/a><figcaption id=\"caption-attachment-15380\" class=\"wp-caption-text\">Position des crat\u00e8res lunaires Messier dans la Mer de la F\u00e9condit\u00e9. \u00a9 Sky Publishing Corp.<\/figcaption><\/figure>\n<p>Il s&#8217;agit de deux crat\u00e8res allong\u00e9s dans le prolongement desquels s&#8217;\u00e9tirent des train\u00e9es claires, le tout dispos\u00e9 selon un axe Est-Ouest. \u00c0 l&#8217;\u00e9poque de la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/12\/01\/superbe-palette-de-couleurs-pour-un-lever-de-pleine-lune\/\" target=\"_blank\" rel=\"noopener\">Pleine Lune<\/a>, l&#8217;ensemble devient tr\u00e8s brillant, signe de la jeunesse (relative) de cette formation :<\/p>\n<figure id=\"attachment_15381\" aria-describedby=\"caption-attachment-15381\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/cratere_messier3.jpg\" rel=\"lightbox[15378]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15381\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/cratere_messier3-450x265.jpg\" alt=\"\" width=\"450\" height=\"265\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/cratere_messier3-450x265.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/cratere_messier3-1024x603.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/cratere_messier3-768x452.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/cratere_messier3.jpg 1100w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15381\" class=\"wp-caption-text\">Les crat\u00e8res Messier et leur rayonnement \u00e0 la Pleine Lune. \u00a9 LROC\/NASA<\/figcaption><\/figure>\n<p>Ces deux curieux crat\u00e8res ont \u00e9t\u00e9 imag\u00e9s \u00e0 haute r\u00e9solution par <a href=\"http:\/\/lroc.sese.asu.edu\/posts\/1136\" target=\"_blank\" rel=\"noopener\">LROC<\/a> (<em>Lunar Reconnaissance Orbiter Camera<\/em>). On peut \u00e9galement les admirer en relief (avec des lunettes appropri\u00e9es) sur cette <a href=\"https:\/\/apod.nasa.gov\/apod\/ap201211.html\" target=\"_blank\" rel=\"noopener\">image st\u00e9r\u00e9oscopique<\/a>.<!--more--><\/p>\n<h5>Triple impact rasant :<\/h5>\n<p>Situ\u00e9 le plus \u00e0 l&#8217;Est, Messier est le plus allong\u00e9 des deux crat\u00e8res. Il mesure 15X8 kilom\u00e8tres et sa profondeur n&#8217;exc\u00e8de pas 1.300 m\u00e8tres. Sa forme elliptique prouve que l&#8217;objet impacteur qui l&#8217;a frapp\u00e9 est arriv\u00e9 avec un angle tr\u00e8s faible, de l&#8217;ordre de 15 degr\u00e9s par rapport \u00e0 la surface lunaire :<\/p>\n<figure id=\"attachment_15383\" aria-describedby=\"caption-attachment-15383\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/crateres_messier.jpg\" rel=\"lightbox[15378]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15383\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/crateres_messier-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/crateres_messier-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/crateres_messier-1024x615.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/crateres_messier-768x462.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/crateres_messier.jpg 1499w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15383\" class=\"wp-caption-text\">De droite \u00e0 gauche (Est-Ouest), les crat\u00e8res lunaires Messier et Messier A. \u00a9 <a href=\"https:\/\/www.facebook.com\/elkolgr\" target=\"_blank\" rel=\"noopener\">Dimitris Kolovos<\/a> pour l&#8217;image de fond, LROC\/NASA pour les vignettes.<\/figcaption><\/figure>\n<p>Son voisin, Messier A, qui mesure 16X11 kilom\u00e8tres, a lui-m\u00eame \u00e9t\u00e9 form\u00e9 par un double impact. Pour les plan\u00e9tologues, un cort\u00e8ge de trois morceaux d&#8217;ast\u00e9ro\u00efde arrivant en rase-motte pourrait \u00eatre responsable de la formation de ces curieux crat\u00e8res et de leurs \u00e9jectas. Une probabilit\u00e9 sans doute tr\u00e8s rare qui ne se retrouve nulle part ailleurs sur la surface lunaire. L&#8217;artiste <a href=\"https:\/\/www.artstation.com\/justv23\" target=\"_blank\" rel=\"noopener\">Justinas Vitkus<\/a> a repr\u00e9sent\u00e9 cette collision cosmique :<\/p>\n<figure id=\"attachment_15384\" aria-describedby=\"caption-attachment-15384\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/crateres_messier2.jpg\" rel=\"lightbox[15378]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15384\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/crateres_messier2-450x158.jpg\" alt=\"\" width=\"450\" height=\"158\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/crateres_messier2-450x158.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/crateres_messier2-1024x360.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/crateres_messier2-768x270.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/01\/crateres_messier2.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15384\" class=\"wp-caption-text\">Repr\u00e9sentation artistique de la formation des crat\u00e8res Messier. \u00a9 Justinas Vitkus<\/figcaption><\/figure>\n<h5>\u00a0Quand l&#8217;observer :<\/h5>\n<p>Cette formation a la particularit\u00e9 d&#8217;\u00eatre int\u00e9ressante \u00e0 observer \u00e0 diff\u00e9rents moments de la lunaison. Elle est accessible avec un grossissement d&#8217;au moins 50 fois. Quatre ou cinq jours apr\u00e8s la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/04\/26\/lincroyable-finesse-du-croissant-juste-apres-la-nouvelle-lune\/\" target=\"_blank\" rel=\"noopener\">Nouvelle Lune<\/a>, les deux crat\u00e8res se d\u00e9tachent nettement sous un \u00e9clairage solaire rasant. On pourra ensuite les pointer \u00e0 nouveau \u00e0 l&#8217;\u00e9poque de la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/01\/25\/la-pleine-lune-de-janvier-se-leve-dans-le-massif-du-queyras\/\" target=\"_blank\" rel=\"noopener\">Pleine Lune<\/a>. M\u00eame si leurs d\u00e9tails s&#8217;estompent avec un Soleil de plus en plus haut dans le ciel lunaire, ils sont alors beaucoup plus brillants que le fond sombre de la Mer de la F\u00e9condit\u00e9.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/07\/10\/infographie-revivez-le-deroulement-de-la-mission-apollo-11\/\" target=\"_blank\" rel=\"noopener\">Infographie : revivez le d\u00e9roulement de la mission Apollo 11<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/01\/06\/insolite-le-telescope-spatial-hubble-photographie-la-lune\/\" target=\"_blank\" rel=\"noopener\">Insolite : le t\u00e9lescope spatial Hubble photographie la Lune<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/11\/11\/au-japon-les-astronomes-ont-vu-la-lune-passer-devant-venus\/\" target=\"_blank\" rel=\"noopener\">Au Japon, les astronomes ont vu la Lune passer devant V\u00e9nus<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/a>\u00a0ou\u00a0<a href=\"https:\/\/twitter.com\/cielmania\" target=\"_blank\" rel=\"noopener noreferrer\">Twitter<\/a>.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Parmi les formations lunaires qui suscitent encore des interrogations, les crat\u00e8res Messier tiennent une place de choix. Un nom \u00e9vocateur : Quand on parle de Messier, on pense d&#8217;abord au c\u00e9l\u00e8bre catalogue qui recense les principaux objets n\u00e9buleux du ciel nocturne. Ce qu&#8217;on sait moins, c&#8217;est que l&#8217;astronome fran\u00e7ais Charles Messier (1730-1817) a \u00e9galement son &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/06\/03\/partez-a-la-decouverte-des-crateres-lunaires-jumeaux-messier\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Observation lunaire : d\u00e9couvrez les crat\u00e8res jumeaux Messier<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":15383,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[83],"tags":[133,3158,2632],"class_list":["post-15378","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-la-lune","tag-charles-messier","tag-crateres-messier","tag-on-the-moon"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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