{"id":22778,"date":"2026-09-28T16:02:39","date_gmt":"2026-09-28T16:02:39","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=22778"},"modified":"2026-09-28T16:02:39","modified_gmt":"2026-09-28T16:02:39","slug":"longmore-8-une-etonnante-nebuleuse-planetaire","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2026\/09\/28\/longmore-8-une-etonnante-nebuleuse-planetaire\/","title":{"rendered":"Longmore 8, une \u00e9tonnante n\u00e9buleuse plan\u00e9taire"},"content":{"rendered":"<p><strong>Vous pensiez avoir tout vu en mati\u00e8re de n\u00e9buleuses plan\u00e9taires ? Attendez de d\u00e9couvrir Longmore 8, surnomm\u00e9e la roue du hamster.<\/strong><\/p>\n<h5>Les fac\u00e9ties d&#8217;une \u00e9toile mourante :<\/h5>\n<p>Longmore 8 est un objet c\u00e9leste vraiment original. Comme toutes les n\u00e9buleuses plan\u00e9taires (NP), elle a \u00e9t\u00e9 cr\u00e9\u00e9e par l\u2019explosion d\u2019une <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-geante-rouge-3731\/\" target=\"_blank\" rel=\"noopener\">\u00e9toile g\u00e9ante rouge<\/a>. Cette derni\u00e8re, en fin de vie, a violemment expuls\u00e9 les couches externes de son atmosph\u00e8re sous forme d&#8217;une coquille gazeuse. Au centre, il ne reste plus qu\u2019un noyau stellaire extr\u00eamement dense et chaud, appel\u00e9 <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-naine-blanche-28\/\" target=\"_blank\" rel=\"noopener\">naine blanche<\/a>. Cette \u00e9toile agonisante n&#8217;a pourtant pas dit son dernier mot. D&#8217;abord, elle excite de son rayonnement ultraviolet (UV) la\u00a0 bulle de gaz en expansion, ce qui la rend lumineuse. Ensuite, elle la sculpte en soufflant de puissants vents stellaires. Et voil\u00e0 comment une banale n\u00e9buleuse plan\u00e9taire devient un incroyable objet cosmique :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/hamster2.jpg\" rel=\"lightbox[22778]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-22781\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/hamster2-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/hamster2-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/hamster2-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/hamster2-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/05\/hamster2.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>La NP en question doit son nom \u00e0 l&#8217;astronome britannique Andy Longmore qui la catalogua \u00e0 la fin des ann\u00e9es 1970. Elle se situe dans la <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Centaure_(constellation)\" target=\"_blank\" rel=\"noopener\">constellation du Centaure<\/a>, \u00e0 environ 6500 <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Ann%C3%A9e-lumi%C3%A8re\" target=\"_blank\" rel=\"noopener\">ann\u00e9es-lumi\u00e8re<\/a>. Si vous pouvez l&#8217;admirer sur <a href=\"https:\/\/app.astrobin.com\/i\/fyqg2v\" target=\"_blank\" rel=\"noopener\">cette image<\/a>, c&#8217;est parce que son auteur, l\u2019astrophotographe Wolfgang Promper (<a href=\"http:\/\/www.astro-pics.com\/\" target=\"_blank\" rel=\"noopener\">Astro-Pics<\/a>), aime bien les d\u00e9fis. Il a choisi d&#8217;assembler des clich\u00e9s pris avec deux instruments diff\u00e9rents : un t\u00e9lescope de 1,5 m\u00e8tre implant\u00e9 au Chili (<a href=\"https:\/\/obstech.cl\/\" target=\"_blank\" rel=\"noopener\">Obstech<\/a>) et un autre de 1 m\u00e8tre de diam\u00e8tre en Namibie (<a href=\"https:\/\/www.tivoli-astrofarm.de\/en\" target=\"_blank\" rel=\"noopener\">Tivoli<\/a>). La galaxie en bas \u00e0 droite de l&#8217;image finale est <a href=\"https:\/\/fr.wikipedia.org\/wiki\/NGC_5121\" target=\"_blank\" rel=\"noopener\">NGC 5121<\/a>.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2026\/02\/13\/zoom-sur-la-nebuleuse-planetaire-ngc-6445\/\" target=\"_blank\" rel=\"noopener\">Zoom sur la n\u00e9buleuse plan\u00e9taire NGC 6445<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/03\/14\/plongez-au-coeur-de-la-nebuleuse-planetaire-puwe-1\/\" target=\"_blank\" rel=\"noopener\">Plongez au c\u0153ur de la n\u00e9buleuse plan\u00e9taire PuWe 1<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/03\/01\/abell-33-la-nebuleuse-planetaire-et-son-diamant\/\" target=\"_blank\" rel=\"noopener\">Abell 33, la n\u00e9buleuse plan\u00e9taire et son diamant<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel sur <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>Vous pensiez avoir tout vu en mati\u00e8re de n\u00e9buleuses plan\u00e9taires ? Attendez de d\u00e9couvrir Longmore 8, surnomm\u00e9e la roue du hamster. Les fac\u00e9ties d&#8217;une \u00e9toile mourante : Longmore 8 est un objet c\u00e9leste vraiment original. Comme toutes les n\u00e9buleuses plan\u00e9taires (NP), elle a \u00e9t\u00e9 cr\u00e9\u00e9e par l\u2019explosion d\u2019une \u00e9toile g\u00e9ante rouge. Cette derni\u00e8re, en fin &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2026\/09\/28\/longmore-8-une-etonnante-nebuleuse-planetaire\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Longmore 8, une \u00e9tonnante n\u00e9buleuse plan\u00e9taire<\/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":23283,"comment_status":"open","ping_status":"open","sticky":true,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[3959,1170,3958,896,3199],"class_list":["post-22778","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-andy-longmore","tag-constellation-du-centaure","tag-longmore-8","tag-nebuleuse-planetaire","tag-wolfgang-promper"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Longmore 8, une \u00e9tonnante n\u00e9buleuse plan\u00e9taire<\/title>\n<meta name=\"description\" content=\"Vous pensiez avoir tout vu en mati\u00e8re de n\u00e9buleuses plan\u00e9taires ? 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