{"id":1387,"date":"2026-05-24T03:39:25","date_gmt":"2026-05-24T03:39:25","guid":{"rendered":"https:\/\/artia13.city\/?p=1387"},"modified":"2026-05-24T03:39:25","modified_gmt":"2026-05-24T03:39:25","slug":"la-comete-interstellaire-3i-atlas-revele-des-informations-sur-sa-composition-et-son-origine","status":"publish","type":"post","link":"https:\/\/artia13.city\/?p=1387","title":{"rendered":"La com\u00e8te interstellaire 3I\/Atlas r\u00e9v\u00e8le des informations sur sa composition et son origine."},"content":{"rendered":"<figure> <img decoding=\"async\" src=\"https:\/\/img.lemde.fr\/2026\/05\/08\/0\/101\/1078\/719\/1440\/960\/60\/0\/9dd48dd_upload-1-auj4w82vyuk1-pia26720-spherex-3i-4panel-colorized-16-white.jpg\" alt=\"La com\u00e8te interstellaire \u00ab\u00a03I\/Atlas\u00a0\u00bb livre ses secrets\" loading=\"lazy\"> <\/figure><p><strong>La com\u00e8te interstellaire 3I\/ATLAS livre ses secrets<\/strong><\/p><p>La com\u00e8te interstellaire 3I\/ATLAS, d\u00e9couverte le 1er juillet 2025, a r\u00e9cemment fait l&rsquo;objet d&rsquo;observations d\u00e9taill\u00e9es gr\u00e2ce au t\u00e9lescope spatial SPHEREx. Entre le 8 et le 15 d\u00e9cembre 2025, les astronomes ont pu analyser la lumi\u00e8re infrarouge \u00e9mise par la poussi\u00e8re, l&rsquo;eau, les mol\u00e9cules organiques et le dioxyde de carbone pr\u00e9sents dans la chevelure de cette com\u00e8te.<\/p><p>Les objets interstellaires, tels que 3I\/ATLAS, sont des ph\u00e9nom\u00e8nes rares et fugaces. Le premier d&rsquo;entre eux, 1I\/\u2018Oumuamua, a \u00e9t\u00e9 d\u00e9tect\u00e9 en octobre 2017, mais n&rsquo;a pu \u00eatre \u00e9tudi\u00e9 que pendant deux mois. Le second, 2I\/Borisov, observ\u00e9 en ao\u00fbt 2019, a offert une visibilit\u00e9 prolong\u00e9e de pr\u00e8s de neuf mois.<\/p><p>Une premi\u00e8re campagne d&rsquo;observation de 3I\/ATLAS, r\u00e9alis\u00e9e de juillet \u00e0 septembre 2025, a confirm\u00e9 qu&rsquo;il s&rsquo;agissait d&rsquo;une com\u00e8te pr\u00e9sentant un noyau riche en \u00e9l\u00e9ments volatils. Le d\u00e9gazage de ces \u00e9l\u00e9ments a form\u00e9 une queue caract\u00e9ristique, orient\u00e9e dans la direction oppos\u00e9e au Soleil. \u00c0 me que la com\u00e8te se rapprochait du Soleil, son observation est devenue difficile, et il a fallu attendre d\u00e9but d\u00e9cembre pour la revoir apr\u00e8s son passage au p\u00e9rih\u00e9lie, le 29 octobre.<\/p><p>Une seconde campagne d&rsquo;observation a \u00e9t\u00e9 lanc\u00e9e pour mieux comprendre la composition de son atmosph\u00e8re, influenc\u00e9e par le d\u00e9gazage intensif post-p\u00e9rih\u00e9lie.<\/p><p><strong>Source : NASA<\/strong><\/p><figcaption><a href=\"https:\/\/www.lemonde.fr\/sciences\/article\/2026\/05\/12\/la-comete-interstellaire-3i-atlas-livre-ses-secrets_6688237_1650684.html\">Source<\/a><\/figcaption>","protected":false},"excerpt":{"rendered":"<p>La com\u00e8te interstellaire 3I\/ATLAS livre&hellip;<\/p>\n","protected":false},"author":1,"featured_media":1388,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28],"tags":[],"class_list":["post-1387","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astrologie-et-science"],"_links":{"self":[{"href":"https:\/\/artia13.city\/index.php?rest_route=\/wp\/v2\/posts\/1387","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/artia13.city\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/artia13.city\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/artia13.city\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/artia13.city\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1387"}],"version-history":[{"count":0,"href":"https:\/\/artia13.city\/index.php?rest_route=\/wp\/v2\/posts\/1387\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/artia13.city\/index.php?rest_route=\/wp\/v2\/media\/1388"}],"wp:attachment":[{"href":"https:\/\/artia13.city\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1387"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/artia13.city\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1387"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/artia13.city\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1387"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}