{"id":18384,"date":"2023-09-11T15:41:54","date_gmt":"2023-09-11T15:41:54","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=18384"},"modified":"2023-09-29T16:10:04","modified_gmt":"2023-09-29T16:10:04","slug":"les-surprenantes-images-de-la-comete-nishimura","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/09\/11\/les-surprenantes-images-de-la-comete-nishimura\/","title":{"rendered":"Les surprenantes images de la com\u00e8te Nishimura"},"content":{"rendered":"<p><strong>Le passage de la com\u00e8te Nishimura a donn\u00e9 lieu \u00e0 de spectaculaires images alors qu&#8217;elle \u00e9tait en r\u00e9alit\u00e9 tr\u00e8s peu visible. Explications.<\/strong><\/p>\n<h5>Com\u00e8te pour initi\u00e9s :<\/h5>\n<p>La com\u00e8te Nishimura (C\/2023 P1) a \u00e9t\u00e9 d\u00e9cevante pour le grand public, il faut se rendre \u00e0 l&#8217;\u00e9vidence. Elle n&#8217;\u00e9tait pas visible \u00e0 l&#8217;\u0153il nu, perdue dans les lueurs de l&#8217;aube. Trop basse, donc att\u00e9nu\u00e9e par l&#8217;absorption atmosph\u00e9rique, son \u00e9clat \u00e9tait insuffisant pour la voir sans au minimum une paire de jumelles. En 2020 la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/07\/19\/la-comete-neowise-dans-le-parc-naturel-regional-du-morvan\/\" target=\"_blank\" rel=\"noopener\">com\u00e8te Neowise<\/a> s&#8217;en \u00e9tait beaucoup mieux sortie :<\/p>\n<figure id=\"attachment_18373\" aria-describedby=\"caption-attachment-18373\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet.jpg\" rel=\"lightbox[18384]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-18373\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-18373\" class=\"wp-caption-text\">Le passage de la com\u00e8te Neowise avait \u00e9t\u00e9 plus spectaculaire. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<p>Cependant, certaines photos ont pu jeter le trouble et laisser croire que C\/2023 P1 \u00e9tait immense et tr\u00e8s brillante dans le ciel \u00e0 l&#8217;aube. Explications.<!--more--><\/p>\n<h5>Clich\u00e9s en deux temps :<\/h5>\n<p>Outre l&#8217;am\u00e9lioration de la sensibilit\u00e9 des capteurs de leurs bo\u00eetiers, les astrophotographes disposent de puissants outils informatiques. Il est par exemple possible d&#8217;empiler des images, une fonction tr\u00e8s pratique pour r\u00e9aliser des <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/10\/05\/rotation-detoiles-dessus-chateau-de-brochon\/\" target=\"_blank\" rel=\"noopener\">rotations d&#8217;\u00e9toiles<\/a>. Dans le cas d&#8217;une com\u00e8te, on peut ainsi associer une image d\u00e9taill\u00e9e de l&#8217;astre chevelu (en r\u00e9alisant des poses longues avec une monture \u00e9quatoriale qui compense la rotation de la Terre) et un simple clich\u00e9 du paysage. C&#8217;est ce que nous explique <a href=\"https:\/\/www.facebook.com\/stephane.vetter.nuitsacrees\" target=\"_blank\" rel=\"noopener\">St\u00e9phane Vetter<\/a> :<\/p>\n<p>\n<!-- iframe plugin v.5.1 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" src=\"https:\/\/www.facebook.com\/plugins\/post.php?href=https%3A%2F%2Fwww.facebook.com%2Fstephane.vetter.nuitsacrees%2Fposts%2Fpfbid0kRiFShmKqkDAudEApnLnbmjd8UnDV6bbCp7nbucabsACpDQvwSAyjqzFwkrcKmWCl&#038;show_text=true&#038;width=450\" width=\"500\" height=\"714\" style=\"border:none;overflow:hidden\" scrolling=\"no\" frameborder=\"0\" allowfullscreen=\"true\" allow=\"autoplay; clipboard-write; encrypted-media; picture-in-picture; web-share\" class=\"iframe-class\"><\/iframe>\n Comme le souligne ce photographe membre de <a href=\"https:\/\/twanight.org\/\" target=\"_blank\" rel=\"noopener\">TWAN<\/a>, il faudrait en toute rigueur r\u00e9aliser les deux clich\u00e9s (com\u00e8te et paysage) avec la m\u00eame focale et au m\u00eame endroit. Les poses longues sur la com\u00e8te seraient simplement destin\u00e9es \u00e0 renforcer son \u00e9clat et mieux r\u00e9v\u00e9ler sa queue sans modifier sa taille apparente. D&#8217;autres photographes prennent beaucoup plus de libert\u00e9 en associant des focales diff\u00e9rentes, d\u00e9voilant une com\u00e8te immense par rapport au paysage terrestre :<\/p>\n<figure id=\"attachment_18390\" aria-describedby=\"caption-attachment-18390\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet1-2.jpg\" rel=\"lightbox[18384]\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-18390 size-medium\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet1-2-450x300.jpg\" alt=\"\" width=\"450\" height=\"300\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet1-2-450x300.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet1-2-1024x683.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet1-2-768x512.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet1-2.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-18390\" class=\"wp-caption-text\">\u00a9 <a href=\"https:\/\/www.facebook.com\/photo\/?fbid=6691837440836364&amp;set=gm.1997602260410226&amp;idorvanity=123943134442824\" target=\"_blank\" rel=\"noopener\">Corn\u00e9 Ouwehand<\/a><\/figcaption><\/figure>\n<figure id=\"attachment_18391\" aria-describedby=\"caption-attachment-18391\" style=\"width: 360px\" class=\"wp-caption alignnone\"><a style=\"font-weight: bold;background-color: transparent\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet2-2.jpg\" rel=\"lightbox[18384]\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-18391 size-medium\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet2-2-360x450.jpg\" alt=\"\" width=\"360\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet2-2-360x450.jpg 360w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet2-2-819x1024.jpg 819w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet2-2-768x960.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet2-2.jpg 1200w\" sizes=\"auto, (max-width: 360px) 100vw, 360px\" \/><\/a><figcaption id=\"caption-attachment-18391\" class=\"wp-caption-text\">\u00a9 <a href=\"https:\/\/www.facebook.com\/photo\/?fbid=10168023977740611&amp;set=gm.1997199977117121&amp;idorvanity=123943134442824\" target=\"_blank\" rel=\"noopener\">Maroun Habib<\/a><\/figcaption><\/figure>\n<p>En r\u00e8gle g\u00e9n\u00e9rale, ils d\u00e9taillent leur mode op\u00e9ratoire. Mais avec la tentation de survoler les images publi\u00e9es sans se pencher dessus, ou par m\u00e9connaissance, nombreux sont les internautes qui ne r\u00e9alisent pas le subterfuge. Ils partagent alors des clich\u00e9s dont l&#8217;aspect esth\u00e9tique est ind\u00e9niable mais qui ne restituent pas la r\u00e9alit\u00e9 du ph\u00e9nom\u00e8ne astronomique.<\/p>\n<figure id=\"attachment_18393\" aria-describedby=\"caption-attachment-18393\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet5.jpg\" rel=\"lightbox[18384]\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-18393 size-medium\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet5-450x365.jpg\" alt=\"\" width=\"450\" height=\"365\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet5-450x365.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet5-1024x830.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet5-768x623.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet5.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-18393\" class=\"wp-caption-text\">\u00a9 <a href=\"https:\/\/www.facebook.com\/photo\/?fbid=10231351740681013&amp;set=gm.1074291270599055&amp;idorvanity=227002358661288\" target=\"_blank\" rel=\"noopener\">Matej Mlakar<\/a><\/figcaption><\/figure>\n<figure id=\"attachment_18394\" aria-describedby=\"caption-attachment-18394\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a style=\"font-weight: bold;background-color: transparent\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet6.jpg\" rel=\"lightbox[18384]\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-18394 size-medium\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet6-450x218.jpg\" alt=\"\" width=\"450\" height=\"218\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet6-450x218.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet6-1024x496.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet6-768x372.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet6.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-18394\" class=\"wp-caption-text\">\u00a9 <a href=\"https:\/\/www.facebook.com\/photo?fbid=10160566602962900&amp;set=gm.1998437513660034&amp;idorvanity=123943134442824\" target=\"_blank\" rel=\"noopener\">Miguel Ventura<\/a><\/figcaption><\/figure>\n<p>C&#8217;est \u00e0 chaque internaute d&#8217;\u00eatre vigilant et \u00e0 chaque photographe de pr\u00e9ciser honn\u00eatement comment il proc\u00e8de. Un code de bonne conduite indispensable \u00e0 l&#8217;heure de l&#8217;<a href=\"https:\/\/www.futura-sciences.com\/tech\/intelligence-artificielle\/\" target=\"_blank\" rel=\"noopener\">intelligence artificielle<\/a> capable de g\u00e9n\u00e9rer toute sorte d&#8217;images. Mais au fait, \u00e0 quoi ressemblait vraiment la com\u00e8te Nishimura si on l&#8217;immortalisait avec une pose photo unique ? \u00c0 ceci :<\/p>\n<figure id=\"attachment_18427\" aria-describedby=\"caption-attachment-18427\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet-1.jpg\" rel=\"lightbox[18384]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-18427\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet-1-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet-1-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet-1-1024x615.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet-1-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/comet-1.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-18427\" class=\"wp-caption-text\">\u00a9 <a href=\"https:\/\/www.facebook.com\/photo\/?fbid=10162097898144796&amp;set=a.10150205119684796\" target=\"_blank\" rel=\"noopener\">Dominique Dierick<\/a><\/figcaption><\/figure>\n<p><span style=\"font-size: 18px;font-weight: bold\">Vous pourriez aimer :<\/span><\/p>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/07\/30\/eruption-surprise-de-la-comete-12p-pons-brooks\/\" target=\"_blank\" rel=\"noopener\">\u00c9ruption surprise de la com\u00e8te 12P\/Pons-Brooks<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/03\/19\/une-galaxie-spirale-dans-le-sillage-de-la-comete-ztf\/\" target=\"_blank\" rel=\"noopener\">Une galaxie spirale dans le sillage de la com\u00e8te ZTF<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/08\/10\/celebre-chasseur-de-cometes-donald-machholz-est-decede\/\" target=\"_blank\" rel=\"noopener\">C\u00e9l\u00e8bre chasseur de com\u00e8tes, Donald Machholz est d\u00e9c\u00e9d\u00e9<\/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>Le passage de la com\u00e8te Nishimura a donn\u00e9 lieu \u00e0 de spectaculaires images alors qu&#8217;elle \u00e9tait en r\u00e9alit\u00e9 tr\u00e8s peu visible. Explications. Com\u00e8te pour initi\u00e9s : La com\u00e8te Nishimura (C\/2023 P1) a \u00e9t\u00e9 d\u00e9cevante pour le grand public, il faut se rendre \u00e0 l&#8217;\u00e9vidence. Elle n&#8217;\u00e9tait pas visible \u00e0 l&#8217;\u0153il nu, perdue dans les lueurs &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/09\/11\/les-surprenantes-images-de-la-comete-nishimura\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Les surprenantes images de la com\u00e8te Nishimura<\/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":18389,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[3444,1027],"class_list":["post-18384","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-c-2023-p1-nishimura","tag-stephane-vetter"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Les surprenantes images de la com\u00e8te Nishimura<\/title>\n<meta name=\"description\" content=\"Le passage de la com\u00e8te Nishimura a donn\u00e9 lieu \u00e0 de spectaculaires images alors qu&#039;elle \u00e9tait en r\u00e9alit\u00e9 tr\u00e8s peu visible. 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