{"id":4183,"date":"2015-11-26T05:29:04","date_gmt":"2015-11-26T05:29:04","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=4183"},"modified":"2015-12-04T05:43:23","modified_gmt":"2015-12-04T05:43:23","slug":"gros-plan-sur-la-majestueuse-galaxie-spirale-ngc-6118","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/11\/26\/gros-plan-sur-la-majestueuse-galaxie-spirale-ngc-6118\/","title":{"rendered":"Gros plan sur la majestueuse galaxie spirale NGC 6118"},"content":{"rendered":"<p><strong>NGC 6118, une superbe galaxie spirale situ\u00e9e \u00e0 80 millions d&#8217;ann\u00e9es-lumi\u00e8re, a \u00e9t\u00e9 immortalis\u00e9e par l&#8217;un des t\u00e9lescopes de l&#8217;Observatoire du mont Lemmon.\u00a0<\/strong><\/p>\n<p>Difficile \u00e0 rep\u00e9rer car aucune de ses <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/10\/05\/du-mont-elbrouz-jaillissent-les-etoiles-de-la-voie-lactee\/\" target=\"_blank\">\u00e9toiles <\/a>n&#8217;est plus brillante que la 3e magnitude, la constellation du Serpent est \u00e0 cheval sur l&#8217;\u00e9quateur c\u00e9leste, La t\u00eate de l&#8217;animal dans l\u2019h\u00e9misph\u00e8re c\u00e9leste nord et la queue dans l\u2019h\u00e9misph\u00e8re c\u00e9leste sud.<\/p>\n<p>Cette constellation compte deux objets du <a href=\"http:\/\/www.futura-sciences.com\/magazines\/espace\/infos\/actu\/d\/astronomie-astronomie-catalogue-messier-250-ans-16597\/\" target=\"_blank\">catalogue Messier<\/a> (l&#8217;amas globulaire M 5 et la n\u00e9buleuse de l&#8217;Aigle M 16) et plusieurs objets NGC (<em>New General Catalogue of Nebulae and Clusters of Stars<\/em>) dont NGC 6118.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/11\/galaxie2.jpg\" rel=\"lightbox[4183]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-4184\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/11\/galaxie2-427x450.jpg\" alt=\"galaxie2\" width=\"427\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/11\/galaxie2-427x450.jpg 427w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/11\/galaxie2-971x1024.jpg 971w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2015\/11\/galaxie2.jpg 1200w\" sizes=\"auto, (max-width: 427px) 100vw, 427px\" \/><\/a><\/p>\n<p>NGC 6118 est une galaxie spirale (comme <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/01\/09\/le-telescope-hubble-zoome-sur-la-galaxie-d-andromede\/\" target=\"_blank\">M 31<\/a> ou <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/09\/21\/la-galaxie-m-96-nouvelle-cible-du-telescope-hubble\/\" target=\"_blank\">M 96<\/a>)\u00a0 qui mesure approximativement 110 000 ann\u00e9es-lumi\u00e8re dans sa plus grande longueur. Les nombreuses taches brillantes bleues que l&#8217;on voit dans ses bras spiraux sont des cocons gazeux qui abritent de jeunes \u00e9toiles chaudes. En 2004 une supernova (SN 2004dk) explosa dans un des bras de la galaxie.<\/p>\n<p><!--more-->Le mont Lemmon, point culminant des monts Santa Catalina en Arizona avec 2 791 m\u00e8tres d&#8217;altitude, a \u00e9t\u00e9 nomm\u00e9 en l&#8217;honneur de Sarah Lemmon, une botaniste qui l&#8217;explora au XIXe si\u00e8cle. C&#8217;est l\u00e0 qu&#8217;on a install\u00e9 depuis 1970 les diff\u00e9rentes coupoles de l&#8217;<a href=\"http:\/\/skycenter.arizona.edu\/\" target=\"_blank\">Observatoire du mont Lemmon<\/a>.<\/p>\n<p>L&#8217;une de ces coupoles abrite le <a href=\"http:\/\/skycenter.arizona.edu\/gallery\/Galaxies\/NGC6118\" target=\"_blank\">t\u00e9lescope Schulman<\/a> dont le miroir principal mesure 81 cm de diam\u00e8tre. Cet instrument a permis de r\u00e9aliser l&#8217;image ci-dessus au mois de mai 2013 avec une cam\u00e9ra ccd et un total de 4 heures de poses. Outre NGC 6118, d&#8217;autres galaxies beaucoup plus \u00e9loign\u00e9es sont visibles sous la forme de petites taches floues. Toutes les \u00e9toiles pr\u00e9sentes dans le champ sont beaucoup plus proches puisqu&#8217;elles font partie de notre galaxie, la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/04\/14\/la-voie-lactee-se-deploie-au-dessus-du-col-du-lautaret\/\" target=\"_blank\">Voie lact\u00e9e<\/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>NGC 6118, une superbe galaxie spirale situ\u00e9e \u00e0 80 millions d&#8217;ann\u00e9es-lumi\u00e8re, a \u00e9t\u00e9 immortalis\u00e9e par l&#8217;un des t\u00e9lescopes de l&#8217;Observatoire du mont Lemmon.\u00a0 Difficile \u00e0 rep\u00e9rer car aucune de ses \u00e9toiles n&#8217;est plus brillante que la 3e magnitude, la constellation du Serpent est \u00e0 cheval sur l&#8217;\u00e9quateur c\u00e9leste, La t\u00eate de l&#8217;animal dans l\u2019h\u00e9misph\u00e8re c\u00e9leste &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/11\/26\/gros-plan-sur-la-majestueuse-galaxie-spirale-ngc-6118\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Gros plan sur la majestueuse galaxie spirale NGC 6118<\/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":4185,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[748,765,1229,1354,1355],"class_list":["post-4183","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-arizona","tag-constellation-du-serpent","tag-galaxie-spirale","tag-ngc-6118","tag-observatoire-du-mont-lemmon"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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