{"id":18117,"date":"2023-11-17T16:53:33","date_gmt":"2023-11-17T16:53:33","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=18117"},"modified":"2023-12-04T17:40:25","modified_gmt":"2023-12-04T17:40:25","slug":"chasse-galactique-entre-le-cobra-et-la-souris","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/11\/17\/chasse-galactique-entre-le-cobra-et-la-souris\/","title":{"rendered":"Chasse galactique entre le Cobra et la Souris"},"content":{"rendered":"<p><strong>Dans la constellation du Poisson volant, le Cobra (la galaxie NGC 2442) va se jeter sur la Souris (la galaxie PGC 21457).<\/strong><\/p>\n<h5>Galaxie distordue :<\/h5>\n<p>Situ\u00e9 \u00e0 environ 75 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>, le Cobra est une galaxie spirale assez atypique. Avec ses deux bras principaux \u00e9cart\u00e9s, elle fait penser \u00e0 un hame\u00e7on ou un Crochet de boucher, son autre surnom. D\u00e9couverte en 1834 par John Herschel (fils du c\u00e9l\u00e8bre <a href=\"https:\/\/www.futura-sciences.com\/sciences\/personnalites\/astronomie-william-herschel-521\/\" target=\"_blank\" rel=\"noopener\">William Herschel<\/a>), elle porte le num\u00e9ro 2442 dans le catalogue NGC. Elle doit tr\u00e8s certainement sa forme tourment\u00e9e \u00e0 des interactions gravitationnelles avec une galaxie voisine. Une bonne candidate pourrait \u00eatre la petite Souris, PGC 21457 :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/07\/morefield2.jpg\" rel=\"lightbox[18117]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-18119\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/07\/morefield2-450x297.jpg\" alt=\"\" width=\"450\" height=\"297\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/07\/morefield2-450x297.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/07\/morefield2-1024x676.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/07\/morefield2-768x507.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/07\/morefield2.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Cette \u00e9tonnante sc\u00e8ne de chasse galactique a \u00e9t\u00e9 saisie par Kevin Morefield. On explorera avec plaisir la <a href=\"https:\/\/www.astrobin.com\/users\/morefield\/\" target=\"_blank\" rel=\"noopener\">galerie d&#8217;images<\/a> et le <a href=\"https:\/\/www.kevinmorefield.com\/\" target=\"_blank\" rel=\"noopener\">site internet<\/a> de cet astrophotographe am\u00e9ricain. Ce superbe clich\u00e9 a n\u00e9cessit\u00e9 plus de 38 heures de poses avec un t\u00e9lescope de 43 centim\u00e8tres de diam\u00e8tre.<\/p>\n<p><!--more--><\/p>\n<h5>\u00c0 savoir :<\/h5>\n<ul>\n<li>Le sigle NGC fait r\u00e9f\u00e9rence \u00e0 l\u2019imposant\u00a0<em>New General Catalogue of Nebulae and Clusters of Stars<\/em> qui regroupe pr\u00e8s de 8.000 objets du ciel profond. Initi\u00e9 par l\u2019astronome irlando-danois John Dreyer, ce catalogue fit l\u2019objet d\u2019une premi\u00e8re \u00e9dition en 1888.<\/li>\n<li>Le PGC (<em>Principal Galaxies Catalogue<\/em>) rassemble pr\u00e8s d&#8217;un million de galaxies jusqu&#8217;\u00e0 la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> 18. Il a \u00e9t\u00e9 \u00e9labor\u00e9 par des astronomes fran\u00e7ais entre 1989 et 2003.<\/li>\n<li>Pour leurs premi\u00e8res observations, les astronomes amateurs d\u00e9butants utilisent des catalogues plus modestes. On peut citer le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/03\/23\/participez-marathon-messier-24-25-mars-2017\/\" target=\"_blank\" rel=\"noopener\">catalogue Messier<\/a>\u00a0cr\u00e9\u00e9 par l\u2019astronome fran\u00e7ais Charles Messier, ainsi que le catalogue Caldwell publi\u00e9 en 1995 par\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/12\/09\/patrick-moore-le-gentleman-de-lastronomie-britannique\/\" target=\"_blank\" rel=\"noopener\">Patrick Moore<\/a>.<\/li>\n<\/ul>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/02\/24\/les-antennes-une-paire-de-galaxies-en-interaction\/\" target=\"_blank\" rel=\"noopener\">Les Antennes, une paire de galaxies en interaction<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/01\/13\/plongee-dans-hickson-44-un-superbe-groupe-de-galaxies\/\" target=\"_blank\" rel=\"noopener\">Plong\u00e9e dans Hickson 44, un superbe groupe de galaxies<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/11\/22\/grande-ourse-un-immense-pont-de-matiere-relie-deux-galaxies\/\" target=\"_blank\" rel=\"noopener\">Grande Ourse : un immense pont de mati\u00e8re relie deux galaxies<\/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>Dans la constellation du Poisson volant, le Cobra (la galaxie NGC 2442) va se jeter sur la Souris (la galaxie PGC 21457). Galaxie distordue : Situ\u00e9 \u00e0 environ 75 millions d&#8217;ann\u00e9es-lumi\u00e8re, le Cobra est une galaxie spirale assez atypique. Avec ses deux bras principaux \u00e9cart\u00e9s, elle fait penser \u00e0 un hame\u00e7on ou un Crochet de &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/11\/17\/chasse-galactique-entre-le-cobra-et-la-souris\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Chasse galactique entre le Cobra et la Souris<\/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":18118,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[3428,3431,3429,3430],"class_list":["post-18117","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-constellation-du-poisson-volant","tag-kevin-morefield","tag-ngc-2442","tag-pgc-21457"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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