{"id":16628,"date":"2022-11-28T16:46:25","date_gmt":"2022-11-28T16:46:25","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=16628"},"modified":"2022-12-09T17:17:23","modified_gmt":"2022-12-09T17:17:23","slug":"prodigieux-exces-de-vitesse-pour-la-nebuleuse-planetaire-ic-5148","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/11\/28\/prodigieux-exces-de-vitesse-pour-la-nebuleuse-planetaire-ic-5148\/","title":{"rendered":"Prodigieux exc\u00e8s de vitesse pour la n\u00e9buleuse plan\u00e9taire IC 5148"},"content":{"rendered":"<p><strong>Dans la constellation australe de la Grue, la petite n\u00e9buleuse plan\u00e9taire IC 5148 continue de se dilater \u00e0 une vitesse ph\u00e9nom\u00e9nale.<\/strong><\/p>\n<h5>Discr\u00e8te NP :<\/h5>\n<p>IC 5148 (IC pour <a href=\"https:\/\/heasarc.gsfc.nasa.gov\/W3Browse\/all\/ngc2000.html\" target=\"_blank\" rel=\"noopener\"><em>Index Catalogue<\/em><\/a>) est une petite <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-nebuleuse-planetaire-51\/\" target=\"_blank\" rel=\"noopener\">n\u00e9buleuse plan\u00e9taire<\/a> (NP) d\u00e9couverte en 1894 par Walter Frederick Gale. Ce banquier australien vouait une passion \u00e0 l&#8217;observation du ciel. Tout comme <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/11\/27\/percival-lowell-lhomme-qui-aimait-trop-la-planete-mars\/\" target=\"_blank\" rel=\"noopener\">Percival Lowell<\/a>, il fut un ardent d\u00e9fenseur des canaux martiens. La n\u00e9buleuse, qu&#8217;on surnomme \u00e9galement la Roue de secours, se trouve dans la constellation de la Grue, juste \u00e0 c\u00f4t\u00e9 d&#8217;un autre oiseau c\u00e9leste, le <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/astronomie-telescope-vista-scrute-amas-toucan-43975\/\" target=\"_blank\" rel=\"noopener\">Toucan<\/a> :<\/p>\n<figure id=\"attachment_16629\" aria-describedby=\"caption-attachment-16629\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/10\/ic5148.jpg\" rel=\"lightbox[16628]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-16629\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/10\/ic5148-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/10\/ic5148-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/10\/ic5148-1024x615.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/10\/ic5148-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/10\/ic5148.jpg 1501w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-16629\" class=\"wp-caption-text\">L&#8217;expansion de la n\u00e9buleuse plan\u00e9taire IC 5148 est tr\u00e8s rapide. \u00a9 Wolfgang Promper<\/figcaption><\/figure>\n<p>Situ\u00e9e \u00e0 3.000 <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-annee-lumiere-17\/\" target=\"_blank\" rel=\"noopener\">ann\u00e9es-lumi\u00e8re<\/a>, la n\u00e9buleuse est peu lumineuse (<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> de 13). N\u00e9anmoins, l&#8217;astronome amateur <a href=\"http:\/\/www.deepsky-drawings.com\/ic-51548-t280\/dsdlang\/fr\" target=\"_blank\" rel=\"noopener\">Bertrand Laville<\/a> est parvenu \u00e0 la d\u00e9tecter avec une lunette de seulement huit centim\u00e8tres de diam\u00e8tre. <!--more--><\/p>\n<h5>Dilatation spectaculaire :<\/h5>\n<p>Eject\u00e9e par une \u00e9toile en fin de vie, la bulle de gaz des n\u00e9buleuses plan\u00e9taires se dilate \u00e0 des vitesses tr\u00e8s rapides. Ces derni\u00e8res sont comprises entre 20 et 30 kilom\u00e8tres\/seconde. Mais la vitesse d&#8217;expansion de la Roue de secours est bien plus \u00e9lev\u00e9e, sup\u00e9rieure \u00e0 50 kilom\u00e8tres\/seconde ! Un ph\u00e9nom\u00e8ne que les astronomes arrivent maintenant \u00e0 d\u00e9celer visuellement, sans pour autant l&#8217;expliquer. Pour cela, ils comparent des clich\u00e9s pris \u00e0 quelques ann\u00e9es d&#8217;intervalle (comme dans le cas de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/12\/07\/la-metamorphose-dune-nebuleuse-na-pris-que-20-ans\/\" target=\"_blank\" rel=\"noopener\">Hen 3-1357<\/a>). Cette \u00e9trange n\u00e9buleuse particuli\u00e8rement v\u00e9loce a \u00e9t\u00e9 photographi\u00e9e dans le pass\u00e9 par <a href=\"https:\/\/www.eso.org\/public\/images\/potw1242a\/?fbclid=IwAR0jcBjDqG9x2LmtA9yM8qguOGWoyr9Uf8Nr4t1f68kaBHWARt6YMLw2iL0\" target=\"_blank\" rel=\"noopener\">un t\u00e9lescope de l&#8217;ESO<\/a> :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/10\/ic5148eso.jpg\" rel=\"lightbox[16628]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-16631\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/10\/ic5148eso-450x450.jpg\" alt=\"\" width=\"450\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/10\/ic5148eso-450x450.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/10\/ic5148eso-1024x1024.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/10\/ic5148eso-150x150.jpg 150w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/10\/ic5148eso-768x767.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/10\/ic5148eso.jpg 1042w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Mais le clich\u00e9 que j&#8217;ai choisi pour illustrer ce sujet est l&#8217;\u0153uvre de l&#8217;astronome amateur Wolfgang Promper (d\u00e9couvrez <a href=\"https:\/\/www.astrobin.com\/users\/Wolfgang-Promper\/\" target=\"_blank\" rel=\"noopener\">sa galerie d&#8217;images<\/a>). L&#8217;image a \u00e9t\u00e9 obtenue en cinq heures de poses avec un t\u00e9lescope automatis\u00e9 install\u00e9 en Namibie.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/09\/19\/spectaculaire-plongee-dans-la-nebuleuse-planetaire-ngc-3132\/\" target=\"_blank\" rel=\"noopener\">En vid\u00e9o : plong\u00e9e dans la n\u00e9buleuse plan\u00e9taire NGC 3132<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/02\/10\/lhistoire-de-la-nebuleuse-de-la-belle-au-bois-dormant-alias-egb-9\/\" target=\"_blank\" rel=\"noopener\">EGB 9, la n\u00e9buleuse retrouv\u00e9e par des amateurs<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/01\/20\/moisson-de-nebuleuses-planetaires-pour-deux-amateurs\/\" target=\"_blank\" rel=\"noopener\">Moisson de n\u00e9buleuses plan\u00e9taires pour deux amateurs<\/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 australe de la Grue, la petite n\u00e9buleuse plan\u00e9taire IC 5148 continue de se dilater \u00e0 une vitesse ph\u00e9nom\u00e9nale. Discr\u00e8te NP : IC 5148 (IC pour Index Catalogue) est une petite n\u00e9buleuse plan\u00e9taire (NP) d\u00e9couverte en 1894 par Walter Frederick Gale. Ce banquier australien vouait une passion \u00e0 l&#8217;observation du ciel. Tout comme &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/11\/28\/prodigieux-exces-de-vitesse-pour-la-nebuleuse-planetaire-ic-5148\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Prodigieux exc\u00e8s de vitesse pour la n\u00e9buleuse plan\u00e9taire IC 5148<\/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":16629,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[3298,896],"class_list":["post-16628","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-ic-5148","tag-nebuleuse-planetaire"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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