{"id":18877,"date":"2024-10-22T09:38:50","date_gmt":"2024-10-22T09:38:50","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=18877"},"modified":"2024-11-06T10:42:30","modified_gmt":"2024-11-06T10:42:30","slug":"coquilles-de-gaz-dans-la-constellation-de-cassiopee","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/10\/22\/coquilles-de-gaz-dans-la-constellation-de-cassiopee\/","title":{"rendered":"Coquilles de gaz dans la constellation de Cassiop\u00e9e"},"content":{"rendered":"<p><strong>Pr\u00e8s de 90 heures de poses auront \u00e9t\u00e9 n\u00e9cessaires pour imager deux faibles n\u00e9buleuses plan\u00e9taires dans la constellation de Cassiop\u00e9e.<\/strong><\/p>\n<h5>C\u00e9l\u00e8bre constellation :<\/h5>\n<p>La constellation de Cassiop\u00e9e a la forme caract\u00e9ristique d\u2019un \u201cW\u201d. Elle a la particularit\u00e9 d&#8217;\u00eatre observable toute l\u2019ann\u00e9e. On dit qu\u2019elle est circumpolaire sous nos latitudes car elle ne passe jamais sous l\u2019horizon. Avec P\u00e9gase et Pers\u00e9e, elle est l&#8217;objet d&#8217;une jolie <a href=\"https:\/\/www.stelvision.com\/astro\/randonnee-celeste-de-pegase-a-cassiopee\/\" target=\"_blank\" rel=\"noopener\">randonn\u00e9e c\u00e9leste propos\u00e9e par Stelvision<\/a>. La constellation est surtout connue pour avoir h\u00e9berg\u00e9 une c\u00e9l\u00e8bre supernova, <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/astronomie-supernova-tycho-grumeaux-decouverts-restes-cette-etoile-18421\/\" target=\"_blank\" rel=\"noopener\">SN 1572<\/a>. Elle fut observ\u00e9e le 11 novembre 1572 par l\u2019astronome danois Tycho Brahe. Elle \u00e9tait alors plus brillante que <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/07\/10\/pointez-leclatante-venus-et-admirez-son-croissant\/\" target=\"_blank\" rel=\"noopener\">V\u00e9nus<\/a> ! Cette SN se situe \u00e0 proximit\u00e9 de l&#8217;\u00e9toile Caph (Beta Cassiopeiae), qui marque l&#8217;extr\u00e9mit\u00e9 droite du &#8220;W&#8221; :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/01\/cassiopee.jpg\" rel=\"lightbox[18877]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-18878\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/01\/cassiopee-450x338.jpg\" alt=\"\" width=\"450\" height=\"338\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/01\/cassiopee-450x338.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/01\/cassiopee-768x576.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/01\/cassiopee.jpg 1024w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Deux astronomes amateurs, <a href=\"https:\/\/www.astrobin.com\/users\/MickaelCoulon\/\" target=\"_blank\" rel=\"noopener\">Mickael Coulon<\/a> et <a href=\"https:\/\/www.astrobin.com\/users\/JulienCadena\/\" target=\"_blank\" rel=\"noopener\">Julien Cadena<\/a>, ont choisi de photographier de tr\u00e8s faibles n\u00e9buleuses plan\u00e9taires cach\u00e9es dans Cassiop\u00e9e. Leur <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> de 15 a n\u00e9cessit\u00e9 pr\u00e8s de 90 heures de poses avec une lunette de 107 millim\u00e8tres de diam\u00e8tre. L&#8217;instrument, pilot\u00e9 \u00e0 distance, est h\u00e9berg\u00e9 dans le Sud de l&#8217;Espagne (<a href=\"https:\/\/www.pixelskiesastro.com\/\" target=\"_blank\" rel=\"noopener\">PixelSkiesAstro<\/a>).<!--more--><\/p>\n<h5>D\u00e9licates bulles cosmiques :<\/h5>\n<p>Les n\u00e9buleuses plan\u00e9taires (NP) repr\u00e9sentent une \u00e9tape dans la vieillesse des \u00e9toiles de moins de huit masses solaires. Lorsqu\u2019elles passent du stade de <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-geante-rouge-3731\/\" target=\"_blank\" rel=\"noopener\">g\u00e9ante rouge<\/a>\u00a0\u00e0 celui de\u00a0<a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-naine-blanche-28\/\" target=\"_blank\" rel=\"noopener\">naine blanche<\/a>, ces \u00e9toiles expulsent une coquille de gaz en expansion. Ce gaz devient lumineux car il est ionis\u00e9 par les photons ultraviolets qui s\u2019\u00e9chappent de l\u2019astre br\u00fblant. Le nom de n\u00e9buleuse plan\u00e9taire correspond \u00e0 l\u2019aspect de ces objets c\u00e9lestes quand on les regarde dans une petite lunette astronomique, ce qui \u00e9tait le cas lors de leur d\u00e9couverte au XVIII\u00e8me si\u00e8cle :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/01\/NFR.jpg\" rel=\"lightbox[18877]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-18880\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/01\/NFR-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/01\/NFR-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/01\/NFR-1024x615.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/01\/NFR-768x462.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/01\/NFR.jpg 1499w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>L&#8217;image ci-dessus fait partie du projet <a href=\"https:\/\/www.astrobin.com\/30yo9o\/?fbclid=IwAR0VXQn2s6cbVMIacy6tCq1HA4yNQ2XoXLuBukoRjVfjSGnwpTzfoKi4iJo\" target=\"_blank\" rel=\"noopener\"><em>Northern France Remote<\/em><\/a>. Elle montre deux NP dans Cassiop\u00e9e, Abell 6 et HFG1. La premi\u00e8re, qui mesure 3 minutes d&#8217;arc, est la sixi\u00e8me entr\u00e9e du catalogue publi\u00e9 en 1958 par l\u2019astronome am\u00e9ricain George Ogden Abell. On peut en voir <a href=\"https:\/\/www.deepsky-drawings.com\/abell-06\/dsdlang\/fr\" target=\"_blank\" rel=\"noopener\">un dessin<\/a> sur le blog de Bertrand Laville. Quant \u00e0 la seconde (8 minutes d&#8217;arc), elle porte les initiales de ses d\u00e9couvreurs en 1982, Joy Heckathorn, Robert Fesen et Theodore Gull.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/09\/19\/spectaculaire-plongee-dans-la-nebuleuse-planetaire-ngc-3132\/\" target=\"_blank\" rel=\"noopener\">En vid\u00e9o : plong\u00e9e dans la n\u00e9buleuse plan\u00e9taire NGC 3132<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/02\/10\/lhistoire-de-la-nebuleuse-de-la-belle-au-bois-dormant-alias-egb-9\/\" target=\"_blank\" rel=\"noopener\">EGB 9, la n\u00e9buleuse retrouv\u00e9e par des amateurs<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/01\/20\/moisson-de-nebuleuses-planetaires-pour-deux-amateurs\/\" target=\"_blank\" rel=\"noopener\">Moisson de n\u00e9buleuses plan\u00e9taires pour deux amateurs<\/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>Pr\u00e8s de 90 heures de poses auront \u00e9t\u00e9 n\u00e9cessaires pour imager deux faibles n\u00e9buleuses plan\u00e9taires dans la constellation de Cassiop\u00e9e. C\u00e9l\u00e8bre constellation : La constellation de Cassiop\u00e9e a la forme caract\u00e9ristique d\u2019un \u201cW\u201d. Elle a la particularit\u00e9 d&#8217;\u00eatre observable toute l\u2019ann\u00e9e. On dit qu\u2019elle est circumpolaire sous nos latitudes car elle ne passe jamais sous &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/10\/22\/coquilles-de-gaz-dans-la-constellation-de-cassiopee\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Coquilles de gaz dans la constellation de Cassiop\u00e9e<\/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":18880,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[3510,401,3511,3514,3513,896,3512,3654],"class_list":["post-18877","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-abell-6","tag-constellation-de-cassiopee","tag-hfg1","tag-julien-cadena","tag-mickael-coulon","tag-nebuleuse-planetaire","tag-northern-france-remote","tag-pixelskiesastro"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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