{"id":18054,"date":"2023-11-02T15:46:24","date_gmt":"2023-11-02T15:46:24","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=18054"},"modified":"2023-11-13T17:16:47","modified_gmt":"2023-11-13T17:16:47","slug":"curiosite-cosmique-ldn-1622-la-nebuleuse-sombre","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/11\/02\/curiosite-cosmique-ldn-1622-la-nebuleuse-sombre\/","title":{"rendered":"Curiosit\u00e9 cosmique : LDN 1622, la n\u00e9buleuse sombre"},"content":{"rendered":"<p><strong>La n\u00e9buleuse sombre LDN 1622 est l&#8217;une des nombreuses curiosit\u00e9s c\u00e9lestes cach\u00e9es dans la c\u00e9l\u00e8bre constellation d&#8217;Orion.<\/strong><\/p>\n<h5>Ombres et lumi\u00e8res dans Orion :<\/h5>\n<p>Si vous ne devez citer qu&#8217;une seule n\u00e9buleuse dans Orion, ce sera sans h\u00e9siter <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/01\/16\/nebuleuse-dorion-se-devoile-ciel-noir-dalqueva\/\" target=\"_blank\" rel=\"noopener\">M 42<\/a> mais certainement pas LDN 1622 ! Il faut bien avouer que nous pr\u00e9f\u00e9rons les n\u00e9buleuses color\u00e9es, ces nuages interstellaires dont le gaz (principalement de l\u2019hydrog\u00e8ne) est ionis\u00e9 par le rayonnement ultraviolet \u00e9mis par de jeunes \u00e9toiles :<\/p>\n<figure id=\"attachment_7069\" aria-describedby=\"caption-attachment-7069\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/01\/nebuleuse_orion.jpg\" rel=\"lightbox[18054]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-7069\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/01\/nebuleuse_orion-450x299.jpg\" alt=\"\" width=\"450\" height=\"299\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/01\/nebuleuse_orion-450x299.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/01\/nebuleuse_orion-768x510.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/01\/nebuleuse_orion-1024x680.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/01\/nebuleuse_orion.jpg 1356w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-7069\" class=\"wp-caption-text\">La plus c\u00e9l\u00e8bre n\u00e9buleuse en \u00e9mission, Messier 42, se trouve dans la constellation d&#8217;Orion. Elle est visible (sans ses couleurs) dans une simple paire de jumelles. \u00a9 Miguel Claro<\/figcaption><\/figure>\n<p>Mais il existe aussi des nuages interstellaires sombres beaucoup plus froids. Alors que la temp\u00e9rature d\u2019un nuage ionis\u00e9 peut atteindre 10.000 K, celle d\u2019un nuage mol\u00e9culaire sombre n\u2019est que de 10 K. Rappelons au passage que 0 K (Kelvin) \u00e9quivaut au z\u00e9ro absolu, la temp\u00e9rature la plus basse qui puisse exister. Elle correspond \u00e0 \u2212273,15 \u00b0C (Celsius). LDN 1622, l&#8217;un de ces nuages sombres, se trouve justement pas tr\u00e8s loin de M 42 :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/07\/orion6.jpg\" rel=\"lightbox[18054]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-18056\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/07\/orion6-367x450.jpg\" alt=\"\" width=\"367\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/07\/orion6-367x450.jpg 367w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/07\/orion6-836x1024.jpg 836w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/07\/orion6-768x941.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/07\/orion6.jpg 922w\" sizes=\"auto, (max-width: 367px) 100vw, 367px\" \/><\/a><\/p>\n<p><!--more--><\/p>\n<h5>Pouponni\u00e8re obscure :<\/h5>\n<p>Au d\u00e9but des ann\u00e9es 1960, l\u2019astronome Beverly Turner Lynds d\u00e9cida de recenser ces nuages sombres. Pr\u00e8s de 1.800 n\u00e9buleuses obscures sont ainsi rassembl\u00e9es dans le LDN (<a href=\"https:\/\/heasarc.gsfc.nasa.gov\/W3Browse\/nebula-catalog\/ldn.html\" target=\"_blank\" rel=\"noopener\"><em>Lynds Catalog of Dark Nebulae<\/em><\/a>). Ces vastes nuages mol\u00e9culaires (on y trouve de l\u2019hydrog\u00e8ne mol\u00e9culaire, appel\u00e9 aussi dihydrog\u00e8ne) produisent un effet saisissant. Tr\u00e8s riches en poussi\u00e8res, ils occultent la lumi\u00e8re de presque toutes les \u00e9toiles et n\u00e9buleuses qui brillent en arri\u00e8re-plan. Comme si un artiste cosmique avait fait couler de l\u2019encre de Chine en plein ciel :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/07\/orion5.jpg\" rel=\"lightbox[18054]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-18055\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/07\/orion5-450x338.jpg\" alt=\"\" width=\"450\" height=\"338\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/07\/orion5-450x338.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/07\/orion5-1024x768.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/07\/orion5-768x576.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/07\/orion5.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Ce superbe <a href=\"https:\/\/noirlab.edu\/public\/images\/iotw2325a\/\" target=\"_blank\" rel=\"noopener\">clich\u00e9<\/a> de LDN 1622 est l&#8217;un des derniers r\u00e9alis\u00e9s par le t\u00e9lescope Mayall avant sa transformation. L&#8217;instrument de 4 m\u00e8tres de diam\u00e8tre install\u00e9 au <a href=\"https:\/\/kpno.noirlab.edu\/\" target=\"_blank\" rel=\"noopener noreferrer\"><em>Kitt Peak National Observatory<\/em><\/a> en Arizona en 1973 est d\u00e9sormais \u00e9quip\u00e9 d&#8217;un nouveau d\u00e9tecteur, DESI (<a href=\"https:\/\/www.desi.lbl.gov\/\" target=\"_blank\" rel=\"noopener\"><em>Dark Energy Spectroscopic Instrument<\/em><\/a>).<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/06\/12\/decouvrez-ldn-43-la-chauve-souris-cosmique\/\" target=\"_blank\" rel=\"noopener\">D\u00e9couvrez LDN 43, la Chauve-souris cosmique<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/12\/13\/une-tache-dencre-au-milieu-de-lamas-detoiles-trumpler-14\/\" target=\"_blank\" rel=\"noopener\">Une tache d\u2019encre au milieu de l\u2019amas d\u2019\u00e9toiles Trumpler 14<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/09\/09\/de-fascinantes-nebuleuses-obscures-parsement-la-voie-lactee\/\" target=\"_blank\" rel=\"noopener\">Fascinantes n\u00e9buleuses obscures dans 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>La n\u00e9buleuse sombre LDN 1622 est l&#8217;une des nombreuses curiosit\u00e9s c\u00e9lestes cach\u00e9es dans la c\u00e9l\u00e8bre constellation d&#8217;Orion. Ombres et lumi\u00e8res dans Orion : Si vous ne devez citer qu&#8217;une seule n\u00e9buleuse dans Orion, ce sera sans h\u00e9siter M 42 mais certainement pas LDN 1622 ! Il faut bien avouer que nous pr\u00e9f\u00e9rons les n\u00e9buleuses color\u00e9es, &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/11\/02\/curiosite-cosmique-ldn-1622-la-nebuleuse-sombre\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Curiosit\u00e9 cosmique : LDN 1622, la n\u00e9buleuse sombre<\/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":18055,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[354,3426,3427],"class_list":["post-18054","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-constellation-dorion","tag-ldn-1622","tag-nebuleuse-sombre"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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