{"id":19822,"date":"2024-09-06T15:48:07","date_gmt":"2024-09-06T15:48:07","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=19822"},"modified":"2024-09-13T16:09:57","modified_gmt":"2024-09-13T16:09:57","slug":"la-fenetre-de-baade-curiosite-du-ciel-dete","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/09\/06\/la-fenetre-de-baade-curiosite-du-ciel-dete\/","title":{"rendered":"La fen\u00eatre de Baade, curiosit\u00e9 du ciel d&#8217;\u00e9t\u00e9"},"content":{"rendered":"<p><strong>Pauvre en poussi\u00e8res interstellaires, la fen\u00eatre de Baade nous offre l&#8217;opportunit\u00e9 d&#8217;observer le centre de notre Galaxie dans le Sagittaire.\u00a0<\/strong><\/p>\n<h5>Poussi\u00e8res interstellaires :<\/h5>\n<p>Par une belle soir\u00e9e d&#8217;\u00e9t\u00e9 sans Lune, la <a href=\"https:\/\/www.futura-sciences.com\/sciences\/espace\/astronomie\/galaxie\/voie-lactee\/\" target=\"_blank\" rel=\"noopener\">Voie lact\u00e9e<\/a> fend le ciel du Nord au Sud de sa douce clart\u00e9. Cette <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/11\/21\/lorigine-de-la-voie-lactee-peinte-par-pierre-paul-rubens\/\" target=\"_blank\" rel=\"noopener\">bande laiteuse<\/a> correspond \u00e0 notre Galaxie vue par la tranche, notre Syst\u00e8me solaire \u00e9tant situ\u00e9 en p\u00e9riph\u00e9rie.<\/p>\n<figure id=\"attachment_6542\" aria-describedby=\"caption-attachment-6542\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/10\/rubens.jpg\" rel=\"lightbox[19822]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-6542\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/10\/rubens-450x333.jpg\" alt=\"\" width=\"450\" height=\"333\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/10\/rubens-450x333.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/10\/rubens-768x569.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/10\/rubens-1024x759.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/10\/rubens.jpg 1215w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-6542\" class=\"wp-caption-text\">L\u2019artiste flamand Pierre Paul Rubens nous a laiss\u00e9 une repr\u00e9sentation de la Voie lact\u00e9e qui s\u2019inspire de la mythologie gr\u00e9co-romaine. La Voie lact\u00e9e repr\u00e9sente le lait qui s&#8217;\u00e9chappe du sein de la d\u00e9esse H\u00e9ra lorsque cette derni\u00e8re repousse Hercule sous le regard de Zeus.<\/figcaption><\/figure>\n<p>En pointant sa modeste lunette en direction de la Voie lact\u00e9e, <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/01\/06\/galilee-le-savant-qui-a-ouvert-nos-yeux-sur-lunivers\/\" target=\"_blank\" rel=\"noopener\">Galil\u00e9e<\/a> fut le premier \u00e0 constater qu&#8217;elle \u00e9tait compos\u00e9e d&#8217;une multitude d&#8217;\u00e9toiles. Ce qu&#8217;il n&#8217;imaginait pas, c&#8217;est la quantit\u00e9 de poussi\u00e8res interstellaires pr\u00e9sentes au milieu des astres. Les astronomes ont calcul\u00e9 qu&#8217;en enlevant cette poussi\u00e8re, la Voie lact\u00e9e serait assez lumineuse pour projeter des ombres !<\/p>\n<figure id=\"attachment_14917\" aria-describedby=\"caption-attachment-14917\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/10\/obp1.jpg\" rel=\"lightbox[19822]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-14917\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/10\/obp1-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/10\/obp1-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/10\/obp1-1024x615.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/10\/obp1-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/10\/obp1.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-14917\" class=\"wp-caption-text\">La poussi\u00e8re interstellaire att\u00e9nue l&#8217;\u00e9clat de la Voie lact\u00e9e. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<p>Toute cette poussi\u00e8re nous emp\u00eache d&#8217;observer en lumi\u00e8re visible le <a href=\"https:\/\/www.insu.cnrs.fr\/fr\/cnrsinfo\/un-seul-episode-de-formation-detoiles-cree-le-bulbe-central-de-la-voie-lactee#:~:text=Une%20nouvelle%20%C3%A9tude%20vient%20contredire,de%2010%20milliards%20d'ann%C3%A9es.\" target=\"_blank\" rel=\"noopener\">bulbe central de notre Voie lact\u00e9e<\/a>, situ\u00e9 dans la direction du Sagittaire. \u00c0 moins de pointer une petite zone surnomm\u00e9e la fen\u00eatre de Baade&#8230; <!--more--><\/p>\n<h5>Le bec de la th\u00e9i\u00e8re :<\/h5>\n<p>C&#8217;est dans les ann\u00e9es 1950 que l&#8217;astronome allemand Walter Baade remarqua une \u00e9troite fen\u00eatre dans la Voie lact\u00e9e d\u00e9pourvue de poussi\u00e8res interstellaires. Cette r\u00e9gion, centr\u00e9e sur l&#8217;amas globulaire NGC 6522, a un diam\u00e8tre d&#8217;environ un degr\u00e9 :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/07\/baade4.jpg\" rel=\"lightbox[19822]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-19830\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/07\/baade4-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/07\/baade4-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/07\/baade4-1024x615.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/07\/baade4-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/07\/baade4.jpg 1501w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Elle se trouve l\u00e9g\u00e8rement au-dessus de Alnasl (<em>Gamma2 Sagittarii<\/em>), une \u00e9toile de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> 3 qui symbolise le bec de la th\u00e9i\u00e8re du Sagittaire. Une <a href=\"https:\/\/www.stelvision.com\/astro\/carte-ciel\/\" target=\"_blank\" rel=\"noopener\">carte du ciel en temps r\u00e9el<\/a> vous guidera pour localiser cette modeste constellation. Les cartes de rep\u00e9rage que je vous propose, extraites de <strong><a href=\"https:\/\/stellarium.org\/fr\/\" target=\"_blank\" rel=\"noopener\">Stellarium<\/a>, <\/strong>vous permettront d&#8217;affiner votre recherche :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/07\/baade2.jpg\" rel=\"lightbox[19822]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-19824\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/07\/baade2-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/07\/baade2-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/07\/baade2-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/07\/baade2-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/07\/baade2.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>La photographie ci-dessous (\u00a9 David Malin) nous montre bien que la fen\u00eatre de Baade est l&#8217;une des r\u00e9gions les plus lumineuses de la Voie lact\u00e9e. On pourra \u00e9galement consulter le tr\u00e8s beau clich\u00e9 r\u00e9alis\u00e9 depuis le Chili par l&#8217;astrophotographe <a href=\"http:\/\/sguisard.astrosurf.com\/Pagim\/Baade_window-LRVB-300mm.html\" target=\"_blank\" rel=\"noopener\">St\u00e9phane Guisard<\/a> :<\/p>\n<figure id=\"attachment_19825\" aria-describedby=\"caption-attachment-19825\" style=\"width: 400px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/07\/baade3.jpg\" rel=\"lightbox[19822]\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-19825 size-full\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/07\/baade3.jpg\" alt=\"\" width=\"400\" height=\"400\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/07\/baade3.jpg 400w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/07\/baade3-150x150.jpg 150w\" sizes=\"auto, (max-width: 400px) 100vw, 400px\" \/><\/a><figcaption id=\"caption-attachment-19825\" class=\"wp-caption-text\">\u00a9 Australian Astronomical Observatory\/David Malin<\/figcaption><\/figure>\n<p>Avec une <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/10\/30\/ciel-aux-jumelles-guide-decouvrir-ciel-nocturne\/\" target=\"_blank\" rel=\"noopener\">paire de jumelles<\/a>, la fen\u00eatre de Baade montre d\u00e9j\u00e0 sa brillance. Songez que la densit\u00e9 en \u00e9toiles de cette zone est telle qu&#8217;il a fallu modifier la proc\u00e9dure d&#8217;acquisition d&#8217;images pour la pointer avec le satellite <a href=\"https:\/\/gaia.obspm.fr\/la-mission\/les-resultats\/article\/que-d-etoiles\" target=\"_blank\" rel=\"noopener\">Gaia<\/a>. Au <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/01\/11\/peut-on-choisir-son-premier-telescope-sans-se-tromper\/\" target=\"_blank\" rel=\"noopener\">t\u00e9lescope<\/a>, la vision de NGC 6522 &#8220;pos\u00e9&#8221; sur un tapis d&#8217;\u00e9toiles est saisissante. L&#8217;\u00e9tendue de l&#8217;amas globulaire semble illimit\u00e9e, ses \u00e9toiles se diluant au milieu de celles du bulbe central situ\u00e9 loin derri\u00e8re.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/05\/30\/au-chili-saisissante-voie-lactee-au-dessus-du-cerro-tololo\/\" target=\"_blank\" rel=\"noopener\">Au Chili, saisissante Voie lact\u00e9e au-dessus du Cerro Tololo<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/11\/20\/portugal-couvent-dorada-sous-la-voie-lactee\/\" target=\"_blank\" rel=\"noopener\">Au Portugal, le couvent d\u2019Orada sous la Voie lact\u00e9e<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/01\/18\/crater-lake-une-nuit-dhiver-sous-la-voie-lactee\/\" target=\"_blank\" rel=\"noopener\">Crater Lake : une nuit d\u2019hiver sous la Voie lact\u00e9e<\/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>Pauvre en poussi\u00e8res interstellaires, la fen\u00eatre de Baade nous offre l&#8217;opportunit\u00e9 d&#8217;observer le centre de notre Galaxie dans le Sagittaire.\u00a0 Poussi\u00e8res interstellaires : Par une belle soir\u00e9e d&#8217;\u00e9t\u00e9 sans Lune, la Voie lact\u00e9e fend le ciel du Nord au Sud de sa douce clart\u00e9. Cette bande laiteuse correspond \u00e0 notre Galaxie vue par la tranche, &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/09\/06\/la-fenetre-de-baade-curiosite-du-ciel-dete\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">La fen\u00eatre de Baade, curiosit\u00e9 du ciel d&#8217;\u00e9t\u00e9<\/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":19830,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[496,3608,166],"class_list":["post-19822","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-constellation-du-sagittaire","tag-fenetre-de-baade","tag-voie-lactee"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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