{"id":17335,"date":"2023-01-25T13:40:37","date_gmt":"2023-01-25T13:40:37","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=17335"},"modified":"2023-01-30T17:37:30","modified_gmt":"2023-01-30T17:37:30","slug":"comete-ztf-ce-que-nous-revelent-les-images","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/01\/25\/comete-ztf-ce-que-nous-revelent-les-images\/","title":{"rendered":"Com\u00e8te ZTF : ce que nous r\u00e9v\u00e8lent les images"},"content":{"rendered":"<p><strong>De nombreuses images de la jolie com\u00e8te C\/2022 E3 (ZTF) circulent actuellement sur les r\u00e9seaux sociaux. Que nous montrent-elles ?<\/strong><\/p>\n<h5>Com\u00e8te photog\u00e9nique :<\/h5>\n<p>M\u00eame si elle reste discr\u00e8te (lire <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/01\/21\/comete-ztf-ce-quen-pense-lastronome-alan-hale\/\" target=\"_blank\" rel=\"noopener\">l&#8217;avis de l&#8217;astronome Alan Hale<\/a>), la com\u00e8te ZTF offre de belles images aux astrophotographes aguerris. Il suffit de consulter des pages comme <a href=\"https:\/\/www.facebook.com\/groups\/227002358661288\/?multi_permalinks=944518600242990&amp;ref=share\" target=\"_blank\" rel=\"noopener\"><em>ICQ Comet Observations<\/em><\/a> ou <a href=\"https:\/\/spaceweathergallery2.com\/index.php?title=comet\" target=\"_blank\" rel=\"noopener\"><em>SpaceWeather<\/em><\/a> pour s&#8217;en convaincre. Mais que nous montrent ces images exactement ? C&#8217;est \u00e0 partir d&#8217;un clich\u00e9 r\u00e9alis\u00e9 par le sp\u00e9cialiste des com\u00e8tes <a href=\"https:\/\/twitter.com\/Komet123Jager?ref_src=twsrc%5Egoogle%7Ctwcamp%5Eserp%7Ctwgr%5Eauthor\" target=\"_blank\" rel=\"noopener\">Michael J\u00e4ger<\/a> que nous allons pouvoir comprendre ce qui se passe<strong> :<\/strong><\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/comet3.jpg\" rel=\"lightbox[17335]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-17337\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/comet3-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/comet3-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/comet3-1024x615.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/comet3-768x462.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/01\/comet3.jpg 1499w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p><!--more--><\/p>\n<h5>Deux, voire trois queues :<\/h5>\n<p>Rappelons tout d&#8217;abord qu&#8217;une com\u00e8te est un petit corps c\u00e9leste. Son diam\u00e8tre varie de 1 km (com\u00e8te <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/comete-comete-46p-wirtanen-chauffe-mysterieusement-459\/\" target=\"_blank\" rel=\"noopener\">Wirtanen<\/a>) \u00e0 60 km (com\u00e8te <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/04\/02\/printemps-1997-la-comete-hale-bopp-illumine-le-ciel\/\" target=\"_blank\" rel=\"noopener\">Hale-Bopp<\/a>). Ce noyau (invisible depuis la Terre) est compos\u00e9 principalement de glace d&#8217;eau et de roches. Lorsqu&#8217;une com\u00e8te s&#8217;approche suffisamment du <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/01\/16\/lactivite-solaire-beaucoup-plus-intense-que-prevu\/\" target=\"_blank\" rel=\"noopener\">Soleil<\/a>, elle commence \u00e0 perdre des poussi\u00e8res et du gaz. Elle prend alors l&#8217;aspect que nous lui connaissons :<\/p>\n<ul>\n<li><strong>une chevelure ou coma<\/strong> pouvant atteindre 100.000 km de diam\u00e8tre se forme autour du noyau. Constitu\u00e9e des \u00e9l\u00e9ments qui s&#8217;\u00e9chappent de la surface du noyau, elle pr\u00e9sente tr\u00e8s souvent la couleur verte caract\u00e9ristique d&#8217;une forte \u00e9mission de carbone diatomique<\/li>\n<li>les gaz ionis\u00e9s sont repouss\u00e9s par le vent solaire ; la <strong>queue de gaz<\/strong> des com\u00e8tes (de couleur bleut\u00e9e) se forme donc toujours dans la direction oppos\u00e9e au Soleil. Actuellement, la queue de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/01\/24\/la-comete-ztf-setire-sur-15-millions-de-kilometres\/\" target=\"_blank\" rel=\"noopener\">la com\u00e8te ZTF s&#8217;\u00e9tire sur 15 millions de kilom\u00e8tres<\/a><\/li>\n<li>la com\u00e8te abandonne \u00e9galement dans son sillage des grains de poussi\u00e8res. C&#8217;est la <strong>queue de poussi\u00e8res<\/strong>, de couleur blanche, beaucoup plus brillante (mais plus courte) que la queue de gaz ionis\u00e9s<\/li>\n<li>une <strong>anti-queue<\/strong> de poussi\u00e8res fait parfois son apparition. Elle est visible \u00e0 &#8220;l&#8217;avant&#8221; du noyau et pointe donc en direction du Soleil.\u00a0 Le ph\u00e9nom\u00e8ne ne peut \u00eatre observ\u00e9 qu&#8217;\u00e0 l&#8217;\u00e9poque o\u00f9\u00a0la Terre traverse l&#8217;orbite de la com\u00e8te et pointe en direction du Soleil.<\/li>\n<\/ul>\n<figure id=\"attachment_15738\" aria-describedby=\"caption-attachment-15738\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/04\/hale-bopp.jpg\" rel=\"lightbox[17335]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15738\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/04\/hale-bopp-450x258.jpg\" alt=\"\" width=\"450\" height=\"258\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/04\/hale-bopp-450x258.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/04\/hale-bopp-1024x588.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/04\/hale-bopp-768x441.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2017\/04\/hale-bopp.jpg 1106w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15738\" class=\"wp-caption-text\">La grande com\u00e8te Hale-Bopp d\u00e9ploie et ses deux queues (de gaz en bleu, de poussi\u00e8res en blanc) au plus pr\u00e8s de la Terre durant le printemps 1997. \u00a9 Jerry Lodriguss<\/figcaption><\/figure>\n<p style=\"padding-left: 40px;text-align: center\"><strong>La com\u00e8te est observable toute la nuit avec un <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>\u00a0ou une paire de jumelles. Pour la rep\u00e9rer, consultez les cartes propos\u00e9es par\u00a0<a href=\"https:\/\/www.stelvision.com\/astro\/la-comete-c-2022-e3-ztf-visible-aux-jumelles-pour-debuter-2023\/\" target=\"_blank\" rel=\"noopener\">Stelvision<\/a>.\u00a0<\/strong><\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/01\/21\/comete-ztf-ce-quen-pense-lastronome-alan-hale\/\" target=\"_blank\" rel=\"noopener\">Com\u00e8te ZTF : ce qu&#8217;en pense l&#8217;astronome Alan Hale<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/03\/23\/interview-michel-ory-astronome-amateur-et-chasseur-de-cometes\/\" target=\"_blank\" rel=\"noopener\">Interview : Michel Ory, chasseur de com\u00e8tes<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/12\/23\/en-avril-1066-le-retour-de-la-comete-de-halley-fut-exceptionnel\/\" target=\"_blank\" rel=\"noopener\">En 1066, le passage de la com\u00e8te de Halley fut exceptionnel<\/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>De nombreuses images de la jolie com\u00e8te C\/2022 E3 (ZTF) circulent actuellement sur les r\u00e9seaux sociaux. Que nous montrent-elles ? Com\u00e8te photog\u00e9nique : M\u00eame si elle reste discr\u00e8te (lire l&#8217;avis de l&#8217;astronome Alan Hale), la com\u00e8te ZTF offre de belles images aux astrophotographes aguerris. Il suffit de consulter des pages comme ICQ Comet Observations ou &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/01\/25\/comete-ztf-ce-que-nous-revelent-les-images\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Com\u00e8te ZTF : ce que nous r\u00e9v\u00e8lent les images<\/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":17337,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[3337,93,895],"class_list":["post-17335","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-c-2022-e3-ztf","tag-comete","tag-michael-jager"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Com\u00e8te ZTF : ce que nous r\u00e9v\u00e8lent les images<\/title>\n<meta name=\"description\" content=\"De nombreuses images de la jolie com\u00e8te C\/2022 E3 (ZTF) circulent actuellement sur les r\u00e9seaux sociaux. 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