{"id":21671,"date":"2025-11-21T16:31:17","date_gmt":"2025-11-21T16:31:17","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=21671"},"modified":"2025-12-05T16:34:06","modified_gmt":"2025-12-05T16:34:06","slug":"ngc-2997-une-elegante-spirale-dans-le-ciel-austral","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/11\/21\/ngc-2997-une-elegante-spirale-dans-le-ciel-austral\/","title":{"rendered":"NGC 2997, une \u00e9l\u00e9gante spirale dans le ciel austral"},"content":{"rendered":"<p><strong>Certaines galaxies sont plus photog\u00e9niques que d&#8217;autres. C&#8217;est le cas de NGC 2997, une \u00e9l\u00e9gante spirale cach\u00e9e dans le ciel austral.<\/strong><\/p>\n<h5>Discr\u00e8te merveille :<\/h5>\n<p>NGC 2997 est une galaxie spirale inclin\u00e9e d&#8217;environ 45 degr\u00e9s situ\u00e9e dans la discr\u00e8te constellation australe de la <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Machine_pneumatique\" target=\"_blank\" rel=\"noopener\">Machine pneumatique<\/a>. D\u00e9couverte en 1793 par <a href=\"https:\/\/fr.wikipedia.org\/wiki\/William_Herschel\" target=\"_blank\" rel=\"noopener\">William Herschel<\/a>, elle a un diam\u00e8tre d&#8217;environ 9X7 minutes d&#8217;arc (par comparaison, le diam\u00e8tre apparent de la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/12\/26\/quand-vincent-van-gogh-peignait-la-pleine-lune\/\" target=\"_blank\" rel=\"noopener\">Pleine Lune<\/a> est de 30 minutes d&#8217;arc). Mais pourquoi cette galaxie a-t-elle droit au titre envi\u00e9 de galaxie de grand style ? Pour m\u00e9riter cette appellation, une galaxie doit pr\u00e9senter des bras spiraux importants et nettement d\u00e9limit\u00e9s. Et c\u2019est bien le cas sur cette superbe image que l&#8217;on doit \u00e0 Patrick Winkler (<a href=\"https:\/\/www.celestialobjects.net\/\" target=\"_blank\" rel=\"noopener\"><em>Celestial Objects<\/em><\/a>). Pour obtenir ce <a href=\"https:\/\/app.astrobin.com\/i\/eyzezg?r=0\" target=\"_blank\" rel=\"noopener\">magnifique portrait c\u00e9leste<\/a>, il a cumul\u00e9 plus de 13 heures de poses avec un t\u00e9lescope ASA 400RC :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/ngc2997.jpg\" rel=\"lightbox[21671]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-21672\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/ngc2997-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/ngc2997-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/ngc2997-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/ngc2997-768x460.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2025\/09\/ngc2997.jpg 1201w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Cette galaxie a connu son heure de gloire au printemps 1999. En effet, c&#8217;est elle qui avait \u00e9t\u00e9 choisie comme &#8220;premi\u00e8re lumi\u00e8re&#8221; du VLT \u00e0 l&#8217;occasion de l&#8217;<a href=\"https:\/\/www.eso.org\/public\/france\/news\/eso9921\/\" target=\"_blank\" rel=\"noopener\">inauguration de l&#8217;Observatoire du Paranal<\/a>. Il faut avouer que le succ\u00e8s de NGC 2997 doit beaucoup aux n\u00e9buleuses rouges d&#8217;<a href=\"https:\/\/media4.obspm.fr\/public\/ressources_lu\/pages_interstellaire\/bb-hydrogene-ionise.html#:~:text=Il%20s'agit%20d'un,sont%20visibles%20sur%20la%20photo.\" target=\"_blank\" rel=\"noopener\">hydrog\u00e8ne ionis\u00e9<\/a> qui d\u00e9corent ses bras spiraux compos\u00e9s de jeunes \u00e9toiles chaudes bleut\u00e9es.<\/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>Certaines galaxies sont plus photog\u00e9niques que d&#8217;autres. C&#8217;est le cas de NGC 2997, une \u00e9l\u00e9gante spirale cach\u00e9e dans le ciel austral. Discr\u00e8te merveille : NGC 2997 est une galaxie spirale inclin\u00e9e d&#8217;environ 45 degr\u00e9s situ\u00e9e dans la discr\u00e8te constellation australe de la Machine pneumatique. D\u00e9couverte en 1793 par William Herschel, elle a un diam\u00e8tre d&#8217;environ &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/11\/21\/ngc-2997-une-elegante-spirale-dans-le-ciel-austral\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">NGC 2997, une \u00e9l\u00e9gante spirale dans le ciel austral<\/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":21672,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[3838,1229,3839,3837,3621],"class_list":["post-21671","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-ciel-austral","tag-galaxie-spirale","tag-machine-pneumatique","tag-ngc-2997","tag-patrick-winkler"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NGC 2997, une \u00e9l\u00e9gante spirale dans le ciel austral<\/title>\n<meta name=\"description\" content=\"Certaines galaxies sont plus photog\u00e9niques que d&#039;autres. 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