{"id":15235,"date":"2021-12-08T15:06:02","date_gmt":"2021-12-08T15:06:02","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=15235"},"modified":"2021-12-13T17:28:14","modified_gmt":"2021-12-13T17:28:14","slug":"sous-un-bon-ciel-la-comete-leonard-est-desormais-visible-a-loeil-nu","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/12\/08\/sous-un-bon-ciel-la-comete-leonard-est-desormais-visible-a-loeil-nu\/","title":{"rendered":"Sous un bon ciel, la com\u00e8te Leonard est visible \u00e0 l&#8217;\u0153il nu"},"content":{"rendered":"<p><strong>Pour les observateurs install\u00e9s sous un ciel bien noir, il est d\u00e9sormais possible de distinguer la com\u00e8te C\/2021 A1 (Leonard) \u00e0 l&#8217;\u0153il nu.<\/strong><\/p>\n<h5>Impr\u00e9visibles com\u00e8tes :<\/h5>\n<p>Le bruit avait couru fin novembre que le noyau de la com\u00e8te C\/2021 A1 (Leonard) s&#8217;\u00e9tait peut-\u00eatre fragment\u00e9. Mais les images obtenues les nuits suivantes ont infirm\u00e9 cette annonce. Heureusement, car si tel avait \u00e9t\u00e9 le cas, l\u2019astre chevelu aurait perdu de son \u00e9clat. Une telle m\u00e9saventure \u00e9tait par exemple arriv\u00e9e au printemps 2020 \u00e0 la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/04\/20\/le-telescope-hubble-le-confirme-la-comete-atlas-sest-brisee\/\" target=\"_blank\" rel=\"noopener\">com\u00e8te C\/2019 Y4 (Atlas)<\/a>. Pas de souci pour Leonard, qui continue de s&#8217;approcher de la Terre.<\/p>\n<figure id=\"attachment_15236\" aria-describedby=\"caption-attachment-15236\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comet_leonard.jpg\" rel=\"lightbox[15235]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15236\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comet_leonard-450x292.jpg\" alt=\"\" width=\"450\" height=\"292\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comet_leonard-450x292.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comet_leonard-1024x664.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comet_leonard-768x498.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comet_leonard.jpg 1350w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15236\" class=\"wp-caption-text\">Image composite (assemblage de deux clich\u00e9s pris avec diff\u00e9rentes focales) montrant la com\u00e8te Leonard le 3 d\u00e9cembre 2021 \u00e0 proximit\u00e9 de l&#8217;amas Messier 3. \u00a9 Ryan Lucenkiw<\/figcaption><\/figure>\n<p>Depuis quelques heures, c&#8217;est fait ! C\/2021 A1 (Leonard) a franchi la barre symbolique de la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> 6. Cette valeur correspond \u00e0 la limite de visibilit\u00e9 d&#8217;un astre \u00e0 l&#8217;\u0153il nu. Bien entendu, il faut que l&#8217;observateur soit install\u00e9 sous un bon ciel, loin de toute <a href=\"https:\/\/www.futura-sciences.com\/sciences\/questions-reponses\/espace-quest-ce-pollution-lumineuse-12\/\" target=\"_blank\" rel=\"noopener\">pollution lumineuse<\/a>.<\/p>\n<figure id=\"attachment_15238\" aria-describedby=\"caption-attachment-15238\" style=\"width: 321px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comet_leonard2.jpg\" rel=\"lightbox[15235]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15238\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comet_leonard2-321x450.jpg\" alt=\"\" width=\"321\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comet_leonard2-321x450.jpg 321w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comet_leonard2-731x1024.jpg 731w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comet_leonard2-768x1075.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/comet_leonard2.jpg 857w\" sizes=\"auto, (max-width: 321px) 100vw, 321px\" \/><\/a><figcaption id=\"caption-attachment-15238\" class=\"wp-caption-text\">Voici \u00e0 quoi on peut s&#8217;attendre si on observe actuellement la com\u00e8te C\/2021 A1 (Leonard) \u00e0 l&#8217;\u0153il nu. \u00a9 Justin Anderson<\/figcaption><\/figure>\n<p><!--more--><\/p>\n<h5>C\/2021 A1\u00a0se rapproche :<\/h5>\n<p>Les mesures de luminosit\u00e9 de la com\u00e8te sont r\u00e9alis\u00e9es r\u00e9guli\u00e8rement par de nombreux astronomes. Pour cela, ils comparent visuellement l&#8217;\u00e9clat du noyau de la com\u00e8te aux \u00e9toiles environnantes dont les magnitudes sont connues. Ce proc\u00e9d\u00e9, utilis\u00e9 depuis longtemps, est particuli\u00e8rement pr\u00e9cis. Les observateurs les plus aguerris peuvent obtenir des mesures avec une pr\u00e9cision de l&#8217;ordre de 0,2 magnitude.<\/p>\n<figure id=\"attachment_15237\" aria-describedby=\"caption-attachment-15237\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/courbe_comet_leonard.jpg\" rel=\"lightbox[15235]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15237\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/courbe_comet_leonard-450x243.jpg\" alt=\"\" width=\"450\" height=\"243\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/courbe_comet_leonard-450x243.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/courbe_comet_leonard-768x414.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/12\/courbe_comet_leonard.jpg 834w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15237\" class=\"wp-caption-text\">Courbe de luminosit\u00e9 de la com\u00e8te Leonard depuis la fin du mois d&#8217;ao\u00fbt. \u00a9 COBS<\/figcaption><\/figure>\n<p>La courbe de luminosit\u00e9 ci-dessus permet de voir l&#8217;\u00e9volution de l&#8217;\u00e9clat de la com\u00e8te depuis cet \u00e9t\u00e9. Sa luminosit\u00e9 va continuer d&#8217;augmenter jusqu&#8217;au 12 d\u00e9cembre, date du passage au plus pr\u00e8s de la Terre. Six jours plus tard, l\u2019astre chevelu se trouvera \u00e0 seulement 4,2 millions de kilom\u00e8tres de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/09\/14\/la-lune-sapproche-de-venus-et-de-lamas-de-la-creche\/\" target=\"_blank\" rel=\"noopener\">V\u00e9nus<\/a>. La com\u00e8te continuera ensuite de s&#8217;approcher du <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/08\/27\/soho-suit-une-brillante-comete-qui-plonge-vers-le-soleil\/\" target=\"_blank\" rel=\"noopener\">Soleil<\/a>, son p\u00e9rih\u00e9lie \u00e9tant fix\u00e9 au 3 janvier 2022.<\/p>\n<figure id=\"attachment_14975\" aria-describedby=\"caption-attachment-14975\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comet1.jpg\" rel=\"lightbox[15235]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-14975\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comet1-450x187.jpg\" alt=\"\" width=\"450\" height=\"187\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comet1-450x187.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comet1-1024x425.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comet1-768x318.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comet1-1536x637.jpg 1536w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comet1.jpg 1727w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-14975\" class=\"wp-caption-text\">D\u00e9placement de la com\u00e8te Leonard fin 2021. \u00a9 Chris Marriott&#8217;s SkyMap\/Sky &amp; Telescope<\/figcaption><\/figure>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/12\/28\/une-comete-permet-de-dater-la-mort-dune-imperatrice-byzantine\/\" target=\"_blank\" rel=\"noopener\">Une com\u00e8te permet de dater la mort d\u2019une imp\u00e9ratrice byzantine<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/08\/25\/la-comete-neowise-immortalisee-par-le-telescope-hubble\/\" target=\"_blank\" rel=\"noopener\">La com\u00e8te Neowise immortalis\u00e9e par le t\u00e9lescope Hubble<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/11\/29\/comete-leonard-la-belle-voyageuse-passe-devant-des-galaxies\/\" target=\"_blank\" rel=\"noopener\">Com\u00e8te Leonard : flirt cosmique avec deux jolies galaxies<\/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>\u00a0ou\u00a0<a href=\"https:\/\/twitter.com\/cielmania\" target=\"_blank\" rel=\"noopener noreferrer\">Twitter<\/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>Pour les observateurs install\u00e9s sous un ciel bien noir, il est d\u00e9sormais possible de distinguer la com\u00e8te C\/2021 A1 (Leonard) \u00e0 l&#8217;\u0153il nu. Impr\u00e9visibles com\u00e8tes : Le bruit avait couru fin novembre que le noyau de la com\u00e8te C\/2021 A1 (Leonard) s&#8217;\u00e9tait peut-\u00eatre fragment\u00e9. Mais les images obtenues les nuits suivantes ont infirm\u00e9 cette annonce. &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/12\/08\/sous-un-bon-ciel-la-comete-leonard-est-desormais-visible-a-loeil-nu\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Sous un bon ciel, la com\u00e8te Leonard est visible \u00e0 l&#8217;\u0153il nu<\/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":15236,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[2965],"class_list":["post-15235","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-comete-c-2021-a1-leonard"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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