{"id":19586,"date":"2025-07-12T15:18:25","date_gmt":"2025-07-12T15:18:25","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=19586"},"modified":"2025-07-13T09:52:08","modified_gmt":"2025-07-13T09:52:08","slug":"la-nebuleuse-du-trefle-joyau-du-ciel-dete","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/07\/12\/la-nebuleuse-du-trefle-joyau-du-ciel-dete\/","title":{"rendered":"La n\u00e9buleuse du Tr\u00e8fle, joyau du ciel d&#8217;\u00e9t\u00e9"},"content":{"rendered":"<p><strong>Surnomm\u00e9e Trifide ou n\u00e9buleuse du Tr\u00e8fle, Messier 20 est une merveille c\u00e9leste nich\u00e9e dans la constellation du Sagittaire.<\/strong><\/p>\n<h5>Une n\u00e9buleuse incontournable :<\/h5>\n<p>Depuis sa d\u00e9couverte en juin 1764 par\u00a0<a title=\"Charles Messier\" href=\"http:\/\/www.futura-sciences.com\/magazines\/espace\/infos\/personnalites\/d\/astronomie-charles-messier-822\/\" target=\"_blank\" rel=\"noopener\">Charles Messier<\/a>, la n\u00e9buleuse du Tr\u00e8fle fascine les amoureux du ciel nocturne. L&#8217;astronome fran\u00e7ais, qui la classa en vingti\u00e8me position dans son <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/astronomie-astronomie-catalogue-messier-250-ans-16597\/\" target=\"_blank\" rel=\"noopener\">c\u00e9l\u00e8bre catalogue<\/a>, ne remarqua pas sa forme si particuli\u00e8re. Le m\u00e9rite en revint \u00e0 <a href=\"https:\/\/fr.wikipedia.org\/wiki\/John_Herschel\" target=\"_blank\" rel=\"noopener\">John Herschel<\/a> (fils du c\u00e9l\u00e8bre <a href=\"https:\/\/www.futura-sciences.com\/sciences\/personnalites\/astronomie-william-herschel-521\/\" target=\"_blank\" rel=\"noopener\">William Herschel<\/a>) soixante ans plus tard. Il constata que des chenaux sombres semblaient diviser la n\u00e9buleuse en trois et lui donna alors le nom de Trifide. Cette forme de tr\u00e8fle est \u00e9vidente sur les photographies de Messier 20 :<\/p>\n<figure id=\"attachment_19587\" aria-describedby=\"caption-attachment-19587\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/trifide.jpg\" rel=\"lightbox[19586]\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-19587 size-medium\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/trifide-450x269.jpg\" alt=\"\" width=\"450\" height=\"269\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/trifide-450x269.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/trifide-1024x613.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/trifide-768x460.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/trifide.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-19587\" class=\"wp-caption-text\">Messier 20, une n\u00e9buleuse en forme de tr\u00e8fle dans le Sagittaire. \u00a9 <a href=\"https:\/\/www.facebook.com\/photo.php?fbid=10232391696365305&amp;set=a.10219083828036914&amp;type=3&amp;ref=embed_post\" target=\"_blank\" rel=\"noopener\">Luigi Morrone<\/a><\/figcaption><\/figure>\n<p>Outre la beaut\u00e9 qu&#8217;elles procurent \u00e0 cette n\u00e9buleuse, les couleurs nous donnent \u00e9galement des informations scientifiques. La zone bleut\u00e9e correspond \u00e0 une n\u00e9buleuse par r\u00e9flexion, dans laquelle la poussi\u00e8re diffuse la lumi\u00e8re de jeunes \u00e9toiles. Le rouge est typique des n\u00e9buleuses en \u00e9mission, o\u00f9 l&#8217;hydrog\u00e8ne ionis\u00e9 par le rayonnement stellaire produit cette coloration. Quant aux sillons sombres, aucune \u00e9toile n&#8217;y est encore n\u00e9e pour faire briller le gaz et la poussi\u00e8re qui les composent.\u00a0 <!--more--><\/p>\n<h5>Comment observer la n\u00e9buleuse du Tr\u00e8fle :<\/h5>\n<p>Pour rep\u00e9rer la n\u00e9buleuse du Tr\u00e8fle, utilisez la fiche d&#8217;observation que Stelvision consacre \u00e0 sa proche voisine, la <a href=\"https:\/\/www.stelvision.com\/astro\/fiche-observation\/la-nebuleuse-de-la-lagune-m8-aux-jumelles\/\" target=\"_blank\" rel=\"noopener\">n\u00e9buleuse de la Lagune<\/a>. L&#8217;emploi d&#8217;une paire de jumelles est le meilleur moyen d&#8217;explorer cette r\u00e9gion riche en objets c\u00e9lestes (nous sommes en pleine <a href=\"https:\/\/www.stelvision.com\/astro\/quand-la-voie-lactee-enchante-nos-nuits\/\" target=\"_blank\" rel=\"noopener\">Voie lact\u00e9e<\/a>) :<\/p>\n<figure id=\"attachment_12253\" aria-describedby=\"caption-attachment-12253\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/astro.jpg\" rel=\"lightbox[19586]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-12253\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/astro-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/astro-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/astro-768x460.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/astro.jpg 960w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-12253\" class=\"wp-caption-text\">Le Sagittaire est visible l&#8217;\u00e9t\u00e9 au-dessus de l&#8217;horizon Sud. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<p>Comme le Sagittaire est une constellation assez basse, l&#8217;absorption atmosph\u00e9rique att\u00e9nue l&#8217;\u00e9clat de la n\u00e9buleuse. Si vous le pouvez, allez l&#8217;observer au Sud de l&#8217;Europe ! Les <a href=\"https:\/\/www.deepsky-drawings.com\/m-020\" target=\"_blank\" rel=\"noopener\">dessins de Bertrand Laville<\/a> nous donnent une id\u00e9e de ce que l&#8217;on peut esp\u00e9rer voir dans un grand t\u00e9lescope (depuis l&#8217;<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/10\/30\/observatoire-des-baronnies-provencales-lastronomie-en-xxl\/\" target=\"_blank\" rel=\"noopener\">Observatoire des Baronnies proven\u00e7ales<\/a>). Dans un instrument plus modeste, Messier 20 reste un objet incontournable du ciel d&#8217;\u00e9t\u00e9 (\u00e0 retrouver dans <a href=\"https:\/\/www.stelvision.com\/astro\/boutique\/le-ciel-au-telescope\/\" target=\"_blank\" rel=\"noopener\">Le ciel au t\u00e9lescope<\/a>).<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/07\/03\/feerie-coloree-dans-la-nebuleuse-de-la-framboise\/\" target=\"_blank\" rel=\"noopener\">F\u00e9\u00e9rie color\u00e9e dans la n\u00e9buleuse de la Framboise<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/02\/04\/des-etoiles-naissent-dans-la-sombre-nebuleuse-de-lhippocampe\/\" target=\"_blank\" rel=\"noopener\">Des proto\u00e9toiles cach\u00e9es dans la n\u00e9buleuse de l\u2019Hippocampe<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/12\/10\/zoom-sur-la-fascinante-nebuleuse-de-la-tete-de-cheval\/\" target=\"_blank\" rel=\"noopener\">Zoom sur la fascinante n\u00e9buleuse de la T\u00eate de Cheval<\/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> et sur\u00a0<a href=\"https:\/\/bsky.app\/profile\/cielmania.bsky.social\" target=\"_blank\" rel=\"noopener\">Bluesky<\/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>Surnomm\u00e9e Trifide ou n\u00e9buleuse du Tr\u00e8fle, Messier 20 est une merveille c\u00e9leste nich\u00e9e dans la constellation du Sagittaire. Une n\u00e9buleuse incontournable : Depuis sa d\u00e9couverte en juin 1764 par\u00a0Charles Messier, la n\u00e9buleuse du Tr\u00e8fle fascine les amoureux du ciel nocturne. L&#8217;astronome fran\u00e7ais, qui la classa en vingti\u00e8me position dans son c\u00e9l\u00e8bre catalogue, ne remarqua pas &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2025\/07\/12\/la-nebuleuse-du-trefle-joyau-du-ciel-dete\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">La n\u00e9buleuse du Tr\u00e8fle, joyau 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":19587,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[496,834,3591,833],"class_list":["post-19586","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-constellation-du-sagittaire","tag-messier-20","tag-nebuleuse-du-trefle","tag-nebuleuse-trifide"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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