{"id":15158,"date":"2021-11-29T17:06:39","date_gmt":"2021-11-29T17:06:39","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=15158"},"modified":"2021-12-08T15:08:35","modified_gmt":"2021-12-08T15:08:35","slug":"comete-leonard-la-belle-voyageuse-passe-devant-des-galaxies","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/11\/29\/comete-leonard-la-belle-voyageuse-passe-devant-des-galaxies\/","title":{"rendered":"Com\u00e8te Leonard : flirt cosmique avec deux jolies galaxies"},"content":{"rendered":"<p><strong>Continuant de se rapprocher de nous, la com\u00e8te C\/2021 A1 (Leonard) est pass\u00e9e \u00e0 proximit\u00e9 de deux galaxies des Chiens de Chasse.\u00a0<\/strong><\/p>\n<h5>Perspective cosmique :<\/h5>\n<p>Cette belle image de la com\u00e8te Leonard a \u00e9t\u00e9 r\u00e9alis\u00e9e le 25 novembre par l&#8217;amateur autrichien <a href=\"https:\/\/www.facebook.com\/profile.php?id=100015205235731\" target=\"_blank\" rel=\"noopener\">Michael J\u00e4ger<\/a>. L&#8217;astre chevelu se trouvait alors devant la constellation bor\u00e9ale des Chiens de Chasse (\u00e0 l\u2019OUEST de la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/10\/07\/la-grande-ourse-et-la-cabotte-sous-la-lune\/\" target=\"_blank\" rel=\"noopener\">Grande Ourse<\/a>). Au second plan se d\u00e9tachent deux curieuses galaxies, beaucoup plus \u00e9loign\u00e9es. Proche de la t\u00eate de la com\u00e8te, on trouve\u00a0 NGC 4656, qui a la forme d\u2019une crosse de hockey. Cette galaxie spirale barr\u00e9e (<a href=\"https:\/\/noirlab.edu\/public\/images\/noao-ngc4656\/\" target=\"_blank\" rel=\"noopener\">photographi\u00e9e au t\u00e9lescope de quatre m\u00e8tres du <em>Kitt Peak National Observatory<\/em><\/a>) a \u00e9t\u00e9 d\u00e9couverte en 1787 par <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/12\/telescope-william-herschel\/\" target=\"_blank\" rel=\"noopener\">William Herschel<\/a>.<\/p>\n<figure id=\"attachment_15160\" aria-describedby=\"caption-attachment-15160\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comete_leonard.jpg\" rel=\"lightbox[15158]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15160\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comete_leonard-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comete_leonard-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comete_leonard-1024x615.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comete_leonard-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/11\/comete_leonard.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15160\" class=\"wp-caption-text\">La com\u00e8te C\/2021 A1 le 25 novembre 2021 dans les Chiens de Chasse.\u00a0 \u00a9 Michael J\u00e4ger<\/figcaption><\/figure>\n<p>\u00c0 sa droite, il y a une autre galaxie spirale barr\u00e9e, NGC 4631. Elle est surnomm\u00e9e la galaxie de la Baleine en raison d\u2019un l\u00e9ger renflement dans sa structure allong\u00e9e qui \u00e9voque la forme du c\u00e9l\u00e8bre c\u00e9tac\u00e9. Une petite galaxie elliptique, NGC 4627, est log\u00e9e juste \u00e0 c\u00f4t\u00e9. Les trois galaxies (en interaction gravitationnelle) se situent \u00e0 environ 30 millions d&#8217;ann\u00e9es-lumi\u00e8re. La com\u00e8te se trouve &#8220;seulement&#8221; \u00e0 quelques dizaines de millions de kilom\u00e8tres. La belle couleur verte de sa t\u00eate est provoqu\u00e9e\u00a0 par une forte \u00e9mission de carbone diatomique.<\/p>\n<h5>\u00c0 savoir :<\/h5>\n<p>D\u00e9couverte le 3 janvier 2021 par l\u2019astronome <a href=\"https:\/\/catalina.lpl.arizona.edu\/person\/greg-leonard\" target=\"_blank\" rel=\"noopener\">Greg Leonard<\/a>, la com\u00e8te C\/2021 A1 mobilise les astronomes depuis plusieurs semaines. La courbe de luminosit\u00e9 pr\u00e9visionnelle laisse esp\u00e9rer un beau passage en fin d&#8217;ann\u00e9e. D\u00e9but d\u00e9cembre, la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> de l&#8217;astre chevelu pourrait \u00eatre comprise entre 3 et 6. Si tel est le cas, il s&#8217;agira de la com\u00e8te la plus brillante de l&#8217;ann\u00e9e 2021.<\/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[15158]\"><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<p>L&#8217;astre chevelu circulant pr\u00e8s de l\u2019horizon Est en fin de nuit, une paire de jumelles sera sans doute n\u00e9cessaire pour bien en profiter. Des cartes de rep\u00e9rage et des estimations d\u2019\u00e9clat sont disponibles sur <a href=\"http:\/\/astro.vanbuitenen.nl\/comet\/2021A1\" target=\"_blank\" rel=\"noopener\">AstroVanbuitenen<\/a>\u00a0et sur\u00a0<a href=\"https:\/\/earthsky.org\/astronomy-essentials\/comet-leonard-might-become-2021s-brightest-2022\/\" target=\"_blank\" rel=\"noopener\">EarthSky<\/a>.<\/p>\n<h5>Derni\u00e8res nouvelles :<\/h5>\n<p>Il y a quelques heures, le bruit a couru d&#8217;une possible d\u00e9sint\u00e9gration du noyau de la com\u00e8te. Si c&#8217;est vraiment le cas, l&#8217;astre chevelu perdra son \u00e9clat et son passage sera beaucoup moins spectaculaire que ce que nous esp\u00e9rions. 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> :<\/p>\n<figure id=\"attachment_11873\" aria-describedby=\"caption-attachment-11873\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/comet.jpg\" rel=\"lightbox[15158]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-11873\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/comet-450x292.jpg\" alt=\"\" width=\"450\" height=\"292\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/comet-450x292.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/comet.jpg 738w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-11873\" class=\"wp-caption-text\">Le t\u00e9lescope spatial Hubble a photographi\u00e9 les morceaux de la com\u00e8te Atlas. \u00a9 NASA<\/figcaption><\/figure>\n<p>Mais rien n&#8217;est confirm\u00e9 pour l&#8217;instant. On peut suivre l&#8217;\u00e9volution de la situation concernant C\/2021 A1 sur ce <a href=\"https:\/\/twitter.com\/Comet2021a1\" target=\"_blank\" rel=\"noopener\">compte Twitter<\/a> ou ce <a href=\"https:\/\/www.facebook.com\/groups\/123943134442824\" target=\"_blank\" rel=\"noopener\">compte Facebook<\/a> par exemple.<\/p>\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\/11\/09\/la-comete-c-2020-m3-atlas-traverse-le-coeur-dorion\/\" target=\"_blank\" rel=\"noopener\">La com\u00e8te C\/2020 M3 (Atlas) traverse le c\u0153ur d\u2019Orion<\/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<\/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>Continuant de se rapprocher de nous, la com\u00e8te C\/2021 A1 (Leonard) est pass\u00e9e \u00e0 proximit\u00e9 de deux galaxies des Chiens de Chasse.\u00a0 Perspective cosmique : Cette belle image de la com\u00e8te Leonard a \u00e9t\u00e9 r\u00e9alis\u00e9e le 25 novembre par l&#8217;amateur autrichien Michael J\u00e4ger. L&#8217;astre chevelu se trouvait alors devant la constellation bor\u00e9ale des Chiens de &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/11\/29\/comete-leonard-la-belle-voyageuse-passe-devant-des-galaxies\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Com\u00e8te Leonard : flirt cosmique avec deux jolies galaxies<\/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":15160,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[2965,2089,895,3144,2087,2088],"class_list":["post-15158","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-comete-c-2021-a1-leonard","tag-constellation-des-chiens-de-chasse","tag-michael-jager","tag-ngc-4627","tag-ngc-4631","tag-ngc-4656"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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