{"id":16142,"date":"2022-06-20T17:02:16","date_gmt":"2022-06-20T17:02:16","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=16142"},"modified":"2022-07-04T15:21:46","modified_gmt":"2022-07-04T15:21:46","slug":"voici-c-2017-k2-panstarrs-la-belle-comete-de-lete","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/06\/20\/voici-c-2017-k2-panstarrs-la-belle-comete-de-lete\/","title":{"rendered":"Voici C\/2017 K2 (Panstarrs), la belle com\u00e8te de l&#8217;\u00e9t\u00e9"},"content":{"rendered":"<p><strong>La com\u00e8te C\/2017 K2 (Panstarrs) se rapproche de nous, une aubaine pour les astrophotographes qui ont quelques semaines pour l&#8217;immortaliser.<\/strong><\/p>\n<h5>Une grosse mais lointaine com\u00e8te :<\/h5>\n<p>La com\u00e8te non p\u00e9riodique C\/2017 K2 (Panstarrs) a \u00e9t\u00e9 d\u00e9couverte en 2017 alors qu&#8217;elle se trouvait entre <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/09\/17\/saturne-la-planete-qui-fait-naitre-des-vocations\/\" target=\"_blank\" rel=\"noopener\">Saturne<\/a> et <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/astronomie-premiere-observation-rayons-x-emis-uranus-86623\/\" target=\"_blank\" rel=\"noopener\">Uranus<\/a>. \u00c0 l&#8217;\u00e9poque, c&#8217;\u00e9tait d\u00e9j\u00e0 une com\u00e8te tr\u00e8s active. Ce qu&#8217;a confirm\u00e9 par la suite le <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/03\/11\/la-camera-acs-du-telescope-hubble-fete-ses-20-ans\/\" target=\"_blank\" rel=\"noopener\">t\u00e9lescope Hubble<\/a> en photographiant autour de son noyau un halo gazeux dont le diam\u00e8tre avoisine 100.000 kilom\u00e8tres ! Ce noyau est sans doute assez gros, de l&#8217;ordre d&#8217;une quarantaine de kilom\u00e8tres de diam\u00e8tre. C&#8217;est comparable \u00e0 celui de la grande 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> et quatre fois plus que celui de la <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-comete-halley-3630\/\" target=\"_blank\" rel=\"noopener\">com\u00e8te de Halley<\/a>.<\/p>\n<figure id=\"attachment_16143\" aria-describedby=\"caption-attachment-16143\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/06\/comete.jpg\" rel=\"lightbox[16142]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-16143\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/06\/comete-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/06\/comete-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/06\/comete-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/06\/comete-768x460.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/06\/comete.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-16143\" class=\"wp-caption-text\">La com\u00e8te C\/2017 K2 le 19 juin 2022 \u00e0 c\u00f4t\u00e9 de l&#8217;amas d&#8217;\u00e9toiles IC 4665. \u00a9 Michael J\u00e4ger<\/figcaption><\/figure>\n<p>Le 19 juin, l\u2019amateur autrichien Michael J\u00e4ger (voir <a href=\"https:\/\/twitter.com\/komet123jager\" target=\"_blank\" rel=\"noopener\">son compte Twitter<\/a>) a photographi\u00e9 la com\u00e8te \u00e0 proximit\u00e9 de l&#8217;amas d&#8217;\u00e9toiles IC 4665 dans la constellation d&#8217;Ophiuchus. La belle couleur verte de la com\u00e8te est provoqu\u00e9e\u00a0 par une forte \u00e9mission de carbone diatomique.<!--more--><\/p>\n<h5>Une com\u00e8te pour les photographes :<\/h5>\n<p>Malgr\u00e9 sa taille et son activit\u00e9 gazeuse intense, C\/2017 K2 (Panstarrs) ne sera pas une Grande com\u00e8te. En effet, cet astre chevelu ne s&#8217;approchera gu\u00e8re de nous. La com\u00e8te sera \u00e0 sa plus courte distance de la Terre le 14 juillet, soit 270 millions de kilom\u00e8tres, beaucoup trop loin pour \u00eatre visible \u00e0 l&#8217;\u0153il nu (<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> probable autour de 8). N&#8217;esp\u00e9rez donc pas assister au spectacle que nous a offert <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\">Neowise<\/a> il y a deux ans :<\/p>\n<figure id=\"attachment_12208\" aria-describedby=\"caption-attachment-12208\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/comet-2.jpg\" rel=\"lightbox[16142]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-12208\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/comet-2-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/comet-2-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/comet-2-1024x615.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/comet-2-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/07\/comet-2.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-12208\" class=\"wp-caption-text\">La com\u00e8te Neowise fut observable sans instrument en 2020. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<p>C\/2017 K2 (Panstarrs) poursuivra sa trajectoire et sera \u00e0 sa plus courte distance du Soleil le 19 d\u00e9cembre prochain. Seuls les astrophotographes bien \u00e9quip\u00e9s profiteront de l&#8217;unique passage de cette belle voyageuse durant l&#8217;\u00e9t\u00e9. Ils trouveront les cartes de rep\u00e9rages et les pr\u00e9visions d&#8217;\u00e9clat sur le site de <a href=\"http:\/\/www.aerith.net\/comet\/catalog\/2017K2\/2017K2.html\" target=\"_blank\" rel=\"noopener\">Seiichi Yoshida<\/a>.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/02\/07\/lexplosion-dune-comete-aurait-decime-des-peuples-amerindiens\/\" target=\"_blank\" rel=\"noopener\">L&#8217;explosion d&#8217;une com\u00e8te aurait d\u00e9cim\u00e9 des peuples Am\u00e9rindiens<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/12\/28\/dans-le-ciel-de-la-palma-la-comete-leonard-fait-son-show\/\" target=\"_blank\" rel=\"noopener\">Dans le ciel de La Palma, la com\u00e8te Leonard fait son show<\/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>\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>La com\u00e8te C\/2017 K2 (Panstarrs) se rapproche de nous, une aubaine pour les astrophotographes qui ont quelques semaines pour l&#8217;immortaliser. Une grosse mais lointaine com\u00e8te : La com\u00e8te non p\u00e9riodique C\/2017 K2 (Panstarrs) a \u00e9t\u00e9 d\u00e9couverte en 2017 alors qu&#8217;elle se trouvait entre Saturne et Uranus. \u00c0 l&#8217;\u00e9poque, c&#8217;\u00e9tait d\u00e9j\u00e0 une com\u00e8te tr\u00e8s active. Ce &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/06\/20\/voici-c-2017-k2-panstarrs-la-belle-comete-de-lete\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Voici C\/2017 K2 (Panstarrs), la belle com\u00e8te de l&#8217;\u00e9t\u00e9<\/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":16143,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[2339,3240,93,666,3241,895],"class_list":["post-16142","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-amas-detoiles","tag-c-2017-k2-panstarrs","tag-comete","tag-constellation-dophiuchus","tag-ic-4665","tag-michael-jager"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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