{"id":19947,"date":"2024-09-24T16:55:59","date_gmt":"2024-09-24T16:55:59","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=19947"},"modified":"2024-10-17T16:49:42","modified_gmt":"2024-10-17T16:49:42","slug":"la-nebuleuse-de-lhelice-ngc-7293-revisitee","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/09\/24\/la-nebuleuse-de-lhelice-ngc-7293-revisitee\/","title":{"rendered":"La n\u00e9buleuse de l&#8217;H\u00e9lice (NGC 7293) revisit\u00e9e"},"content":{"rendered":"<p><strong>L&#8217;astrophotographe Bob Fera vient de r\u00e9aliser un somptueux portrait de la n\u00e9buleuse de l\u2019H\u00e9lice (NGC 7293) dans le\u00a0 Verseau.<\/strong><\/p>\n<h5>Spectacle cosmique \u00e9ph\u00e9m\u00e8re :<\/h5>\n<p>La n\u00e9buleuse plan\u00e9taire de l\u2019H\u00e9lice (NGC 7293) se situe \u00e0 650 <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-annee-lumiere-17\/\" target=\"_blank\" rel=\"noopener\">ann\u00e9es-lumi\u00e8re<\/a> dans la constellation du Verseau. C\u2019est Karl Ludwig Harding qui l\u2019observa le premier en 1824. Cet astronome allemand \u00e9tait d\u00e9j\u00e0 c\u00e9l\u00e8bre pour avoir d\u00e9couvert la <a href=\"https:\/\/www.asc-csa.gc.ca\/fra\/astronomie\/systeme-solaire\/planetes-naines.asp\" target=\"_blank\" rel=\"noopener\">plan\u00e8te naine<\/a> Junon vingt ans plus t\u00f4t. Mais au fait, qu\u2019est-ce qu\u2019une n\u00e9buleuse plan\u00e9taire ? Lorsqu\u2019une \u00e9toile de moins de huit masses solaires arrive en fin de vie, elle projette dans l\u2019espace ses couches externes qui forment une bulle gazeuse en expansion. Le \u00a0c\u0153ur de cet astre (qui va devenir une <a href=\"http:\/\/www.futura-sciences.com\/magazines\/espace\/infos\/actu\/d\/univers-lointain-on-ecoute-vibrations-naine-blanche-coeur-cristallise-47270\/\" target=\"_blank\" rel=\"noopener noreferrer\">naine blanche<\/a>) \u00e9met alors un puissant rayonnement ultraviolet qui ionise le gaz de la n\u00e9buleuse, lui donnant ses couleurs :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/bobfera2.jpg\" rel=\"lightbox[19947]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-20157\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/bobfera2-450x298.jpg\" alt=\"\" width=\"450\" height=\"298\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/bobfera2-450x298.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/bobfera2-1024x679.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/bobfera2-768x509.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/bobfera2.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Cette magnifique image est l&#8217;\u0153uvre de l&#8217;astrophotographe <a href=\"http:\/\/www.feraphotography.com\/DSRO-South\/Ngc7293.html\" target=\"_blank\" rel=\"noopener\">Bob Fera<\/a>. Elle a n\u00e9cessit\u00e9 plus de 29 heures de poses cumul\u00e9es avec diff\u00e9rents filtres. Quant au t\u00e9lescope utilis\u00e9, son diam\u00e8tre est de 43 centim\u00e8tres. C\u2019est un spectacle \u00e9ph\u00e9m\u00e8re \u00e0 l\u2019\u00e9chelle de l\u2019Univers, quelques dizaines de milliers d\u2019ann\u00e9es tout au plus avant que le gaz de la n\u00e9buleuse ne se dilue compl\u00e8tement dans l\u2019espace.<\/p>\n<p><!--more--><\/p>\n<h5>Plan\u00e8tes ou n\u00e9buleuses ?<\/h5>\n<p>Les n\u00e9buleuses plan\u00e9taires n\u2019ont rien en commun avec les plan\u00e8tes. Leur nom leur a \u00e9t\u00e9 donn\u00e9 par <a href=\"https:\/\/www.futura-sciences.com\/sciences\/personnalites\/astronomie-william-herschel-521\/\" target=\"_blank\" rel=\"noopener\">William Herschel<\/a>. Quand il rep\u00e8re NGC 7009 (la <a href=\"https:\/\/esahubble.org\/images\/opo9738g\/\" target=\"_blank\" rel=\"noopener\">n\u00e9buleuse Saturne<\/a>) dans son t\u00e9lescope le 7 septembre 1782, son aspect lui rappelle <a href=\"https:\/\/www.stelvision.com\/astro\/observer-uranus\/\" target=\"_blank\" rel=\"noopener\">Uranus<\/a>, la plan\u00e8te qu&#8217;il a d\u00e9couverte un an plus t\u00f4t. Mais il doit se rendre \u00e0 l&#8217;\u00e9vidence : peu importe le grossissement employ\u00e9, la luminosit\u00e9 de l&#8217;objet reste constante, ce qui n&#8217;est pas le cas quand on observe les plan\u00e8tes. L&#8217;astronome germano-britannique propose alors de la classer dans une nouvelle famille d\u2019objets c\u00e9lestes, les n\u00e9buleuses plan\u00e9taires.<\/p>\n<figure id=\"attachment_12496\" aria-describedby=\"caption-attachment-12496\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/helix.jpg\" rel=\"lightbox[19947]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-12496\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/helix-450x338.jpg\" alt=\"\" width=\"450\" height=\"338\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/helix-450x338.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/helix-1024x768.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/helix-768x576.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/09\/helix.jpg 1200w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-12496\" class=\"wp-caption-text\">La n\u00e9buleuse de l&#8217;H\u00e9lice. \u00a9 NASA\/JPL-Caltech\/K. Su (Univ. of Arizona)<\/figcaption><\/figure>\n<p>Notez que si on regarde la n\u00e9buleuse de l&#8217;H\u00e9lice <a href=\"https:\/\/photojournal.jpl.nasa.gov\/catalog\/PIA09178\" target=\"_blank\" rel=\"noopener\">photographi\u00e9e en infrarouge par le t\u00e9lescope spatial Spitzer<\/a> (image ci-dessus), elle a un aspect bien diff\u00e9rent.<\/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>L&#8217;astrophotographe Bob Fera vient de r\u00e9aliser un somptueux portrait de la n\u00e9buleuse de l\u2019H\u00e9lice (NGC 7293) dans le\u00a0 Verseau. Spectacle cosmique \u00e9ph\u00e9m\u00e8re : La n\u00e9buleuse plan\u00e9taire de l\u2019H\u00e9lice (NGC 7293) se situe \u00e0 650 ann\u00e9es-lumi\u00e8re dans la constellation du Verseau. C\u2019est Karl Ludwig Harding qui l\u2019observa le premier en 1824. Cet astronome allemand \u00e9tait d\u00e9j\u00e0 &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/09\/24\/la-nebuleuse-de-lhelice-ngc-7293-revisitee\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">La n\u00e9buleuse de l&#8217;H\u00e9lice (NGC 7293) revisit\u00e9e<\/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":20158,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[3640,2001,2916,2917,129],"class_list":["post-19947","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-bob-fera","tag-constellation-du-verseau","tag-nebuleuse-de-lhelice","tag-ngc-7293","tag-william-herschel"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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