{"id":16351,"date":"2022-09-07T05:49:20","date_gmt":"2022-09-07T05:49:20","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=16351"},"modified":"2022-09-21T13:45:40","modified_gmt":"2022-09-21T13:45:40","slug":"m83-quinze-amateurs-sunissent-pour-un-magnifique-portrait","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/09\/07\/m83-quinze-amateurs-sunissent-pour-un-magnifique-portrait\/","title":{"rendered":"M83 : quinze amateurs s&#8217;unissent pour un magnifique portrait"},"content":{"rendered":"<p><strong>Quinze astronomes amateurs ont mis en commun leurs comp\u00e9tences pour r\u00e9aliser une superbe image de la galaxie spirale M83.<\/strong><\/p>\n<h5>Une galaxie flamboyante :<\/h5>\n<p>M83 (NGC 5236) est une galaxie spirale interm\u00e9diaire vue de face et situ\u00e9e dans la constellation australe de l&#8217;Hydre. Elle se trouve \u00e0 environ 15,2 millions d&#8217;<a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-annee-lumiere-17\/\" target=\"_blank\" rel=\"noopener\">ann\u00e9es-lumi\u00e8re<\/a> de la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/10\/11\/le-volcan-chilien-villarrica-en-activite-sous-la-voie-lactee\/\" target=\"_blank\" rel=\"noopener\">Voie lact\u00e9e<\/a> et ressemble beaucoup \u00e0 la galaxie du Moulinet, <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/astronomie-astrophotographie-deux-visions-galaxie-m-101-31034\/\" target=\"_blank\" rel=\"noopener\">M101<\/a>. C&#8217;est pour cette raison que M83 est parfois appel\u00e9e la galaxie australe du Moulinet. Elle a \u00e9t\u00e9 d\u00e9couverte en 1752 par Nicolas-Louis de Lacaille. La m\u00eame ann\u00e9e, cet astronome fran\u00e7ais d\u00e9nichait \u00e9galement la c\u00e9l\u00e8bre <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/08\/15\/dans-la-carene-le-jwst-scrute-les-rivages-dun-ocean-cosmique\/\" target=\"_blank\" rel=\"noopener\">n\u00e9buleuse de la Car\u00e8ne<\/a>. En 2014, le <a href=\"https:\/\/esahubble.org\/images\/heic1403a\/\" target=\"_blank\" rel=\"noopener\">t\u00e9lescope spatial Hubble<\/a> avait immortalis\u00e9 cette galaxie :<\/p>\n<figure id=\"attachment_16353\" aria-describedby=\"caption-attachment-16353\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/messier83_hubble.jpg\" rel=\"lightbox[16351]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-16353\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/messier83_hubble-450x293.jpg\" alt=\"\" width=\"450\" height=\"293\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/messier83_hubble-450x293.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/messier83_hubble-1024x666.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/messier83_hubble-768x500.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/messier83_hubble.jpg 1280w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-16353\" class=\"wp-caption-text\">La galaxie australe du Moulinet (NGC 5236) photographi\u00e9e en 2014 par le t\u00e9lescope spatial Hubble. \u00a9 NASA\/ESA\/The Hubble Heritage Team (STScI\/AURA)<\/figcaption><\/figure>\n<p>Mais comment rivaliser avec les grands t\u00e9lescopes professionnels pour tirer le portrait de cette flamboyante galaxie ? C&#8217;est le projet un peu fou qui a mobilis\u00e9 quinze astronomes amateurs italiens. <!--more--><\/p>\n<h5>Astronomes unis :<\/h5>\n<p>Rassembl\u00e9s autour d&#8217;Alessandro Ravagnin (qui nous raconte cette aventure <a href=\"https:\/\/astrotrex.wordpress.com\/2022\/08\/09\/fotonicontest4-the-journey-ends\/\" target=\"_blank\" rel=\"noopener\">ici<\/a>), ces passionn\u00e9s ont lou\u00e9 un t\u00e9lescope de un m\u00e8tre de diam\u00e8tre situ\u00e9 au Chili, dans le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/07\/22\/chili-nuit-magique-dans-le-salar-datacama\/\" target=\"_blank\" rel=\"noopener\">d\u00e9sert d&#8217;Atacama<\/a>. L&#8217;instrument, g\u00e9r\u00e9 par l&#8217;agence <a href=\"http:\/\/www.chilescope.com\/\" target=\"_blank\" rel=\"noopener\">Chilescope<\/a>, avait servi en 2020 pour r\u00e9aliser <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/11\/08\/voici-la-plus-belle-image-de-la-planete-mars-jamais-realisee\/\" target=\"_blank\" rel=\"noopener\">la plus belle image de la plan\u00e8te Mars<\/a>. \u00c0 distance, nos quinze mousquetaires ont accumul\u00e9 plus de sept heures de poses avec diff\u00e9rents filtres. Ensuite, chacun a trait\u00e9 chez lui les donn\u00e9es recueillies. Et voici le r\u00e9sultat final :<\/p>\n<figure id=\"attachment_16352\" aria-describedby=\"caption-attachment-16352\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/messier83.jpg\" rel=\"lightbox[16351]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-16352\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/messier83-450x342.jpg\" alt=\"\" width=\"450\" height=\"342\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/messier83-450x342.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/messier83-1024x778.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/messier83-768x583.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/messier83.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-16352\" class=\"wp-caption-text\">Quinze amateurs ont particip\u00e9 \u00e0 la r\u00e9alisation de cette belle image de la galaxie M83 en utilisant un t\u00e9lescope de un m\u00e8tre de diam\u00e8tre. \u00a9 Chilescope\/ Alessandro Ravagnin<\/figcaption><\/figure>\n<p>Ce magnifique portrait nous r\u00e9v\u00e8le toute la richesse de cette flamboyante galaxie. L&#8217;ext\u00e9rieur est compos\u00e9 de jeunes \u00e9toiles bleut\u00e9es. Quant \u00e0 la partie centrale, elle est occup\u00e9e par des \u00e9toiles orang\u00e9es (plus \u00e2g\u00e9es). Les taches rouges que vous voyez diss\u00e9min\u00e9es le long des bras spiraux sont de vastes nuages d&#8217;hydrog\u00e8ne identiques \u00e0 la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/01\/16\/nebuleuse-dorion-se-devoile-ciel-noir-dalqueva\/\" target=\"_blank\" rel=\"noopener\">n\u00e9buleuse d&#8217;Orion<\/a>.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/05\/17\/ngc-4565-la-belle-galaxie-spirale-oubliee-par-charles-messier\/\" target=\"_blank\" rel=\"noopener\">NGC 4565, la belle galaxie spirale oubli\u00e9e par Charles Messier<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/02\/08\/ce-fuseau-argente-ic-2233-est-une-galaxie-spirale-ultra-mince\/\" target=\"_blank\" rel=\"noopener\">Ce fuseau argent\u00e9, IC 2233, est une galaxie spirale ultra-mince<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/03\/22\/zoom-sur-messier-61-une-magnifique-galaxie-spirale\/\" target=\"_blank\" rel=\"noopener\">Zoom sur Messier 61, une magnifique galaxie spirale<\/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>.<\/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>Quinze astronomes amateurs ont mis en commun leurs comp\u00e9tences pour r\u00e9aliser une superbe image de la galaxie spirale M83. Une galaxie flamboyante : M83 (NGC 5236) est une galaxie spirale interm\u00e9diaire vue de face et situ\u00e9e dans la constellation australe de l&#8217;Hydre. Elle se trouve \u00e0 environ 15,2 millions d&#8217;ann\u00e9es-lumi\u00e8re de la Voie lact\u00e9e et &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/09\/07\/m83-quinze-amateurs-sunissent-pour-un-magnifique-portrait\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">M83 : quinze amateurs s&#8217;unissent pour un magnifique portrait<\/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":16352,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[87],"tags":[3260,2942,1103,1229,3259],"class_list":["post-16351","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-hommes-et-le-ciel","tag-alessandro-ravagnin","tag-chilescope","tag-constellation-de-lhydre","tag-galaxie-spirale","tag-m83"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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