{"id":5100,"date":"2026-05-04T15:46:07","date_gmt":"2026-05-04T18:46:07","guid":{"rendered":"https:\/\/overticeportal.com.br\/?p=5100"},"modified":"2026-05-04T15:46:11","modified_gmt":"2026-05-04T18:46:11","slug":"astronomos-descobrem-atmosfera-em-pequeno-mundo-gelado-nos-confins-do-sistema-solar","status":"publish","type":"post","link":"https:\/\/portalam9.com.br\/?p=5100","title":{"rendered":"Astr\u00f4nomos descobrem atmosfera em pequeno mundo gelado nos &#8216;confins&#8217; do Sistema Solar"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><em>Tempo de leitura: 2 minutos <\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Astr\u00f4nomos detectaram uma fina atmosfera ao redor de um pequeno&nbsp;<strong>objeto gelado&nbsp;<\/strong>que orbita o Sol al\u00e9m da \u00f3rbita de Netuno, mais distante at\u00e9 do que Plut\u00e3o.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A descoberta foi publicada nesta segunda-feira (4) na revista &#8220;<em>Nature Astronom<\/em>y&#8221; e desafia a ideia de que apenas planetas e corpos celestes maiores conseguem manter atmosferas est\u00e1veis.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O objeto observado \u00e9 o chamado&nbsp;<strong>(612533) 2002 XV93<\/strong>, um corpo de cerca de 250 quil\u00f4metros de raio localizado no cintur\u00e3o de Kuiper, a quase 6 bilh\u00f5es de quil\u00f4metros da Terra.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At\u00e9 agora, o \u00fanico objeto transnetuniano com atmosfera detectada de forma inequ\u00edvoca era o pr\u00f3prio Plut\u00e3o.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tentativas em corpos maiores, como os planetas an\u00f5es Eris, Makemake e Quaoar, n\u00e3o haviam encontrado uma atmosfera semelhante.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A equipe liderada pelo astr\u00f4nomo Ko Arimatsu, do Observat\u00f3rio Astron\u00f4mico Nacional do Jap\u00e3o, aproveitou um evento chamado oculta\u00e7\u00e3o estelar, em que o objeto passa na frente de uma estrela vista da Terra e bloqueia temporariamente sua luz.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A an\u00e1lise de como esse brilho diminui ao longo do tempo permite identificar caracter\u00edsticas do objeto, como seu tamanho, formato e at\u00e9 a presen\u00e7a de material ao redor.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A observa\u00e7\u00e3o foi feita em&nbsp;<strong>10 de janeiro de 2024<\/strong>&nbsp;a partir de tr\u00eas pontos do Jap\u00e3o. Em Kyoto, um telesc\u00f3pio compacto foi instalado no terra\u00e7o da Universidade de Kyoto.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">No observat\u00f3rio de Kiso, foi usado um telesc\u00f3pio Schmidt de 1,05 metro equipado com uma c\u00e2mera de alta resolu\u00e7\u00e3o temporal.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">O terceiro ponto, em Fukushima, foi operado pelo astr\u00f4nomo amador Katsumasa Hosoi, com um telesc\u00f3pio de 25 cent\u00edmetros.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Em vez do apagar e acender abrupto t\u00edpico de objetos sem atmosfera, a luz da estrela diminuiu de forma gradual durante a oculta\u00e7\u00e3o.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Esse padr\u00e3o \u00e9 a assinatura caracter\u00edstica de uma camada fina de g\u00e1s ao redor do objeto, que desvia ligeiramente os raios de luz antes do bloqueio total.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ainda segundo os cientistas, a an\u00e1lise indica uma press\u00e3o atmosf\u00e9rica entre&nbsp;<strong>100 e 200 nanobares<\/strong>&nbsp;\u2014 cerca de 5 a 10 milh\u00f5es de vezes mais fina que a atmosfera terrestre.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/s2-g1.glbimg.com\/IFHwlkVqEundJwjiU1AV1MeZ5Qc=\/0x0:800x533\/984x0\/smart\/filters:strip_icc()\/i.s3.glbimg.com\/v1\/AUTH_59edd422c0c84a879bd37670ae4f538a\/internal_photos\/bs\/2026\/s\/l\/fwTyzUQzmveMYNzvT8Qw\/1ccbe910-08be-11f1-b197-d9b05591fdc1.jpg.webp\" alt=\"Ilustra\u00e7\u00e3o do Sistema Solar \u2014 Foto: Ag\u00eancia Espacial Europeia\/Silicon Worlds\"\/><figcaption class=\"wp-element-caption\">Ilustra\u00e7\u00e3o do Sistema Solar \u2014 Foto: Ag\u00eancia Espacial Europeia\/Silicon Worlds<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Os pesquisadores testaram tr\u00eas cen\u00e1rios para a composi\u00e7\u00e3o qu\u00edmica do g\u00e1s: metano, nitrog\u00eanio ou mon\u00f3xido de carbono.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Os tr\u00eas modelos s\u00e3o compat\u00edveis com os dados, e ainda n\u00e3o \u00e9 poss\u00edvel distinguir qual corresponde \u00e0 realidade. S\u00e3o justamente os mesmos compostos que formam a atmosfera de Plut\u00e3o.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Foto: Credit: NAOJ \/ Ko Arimatsu<\/em> <strong>\/<\/strong> <em>Fonte: g1<\/em><br><br><br><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tempo de leitura: 2 minutos Astr\u00f4nomos detectaram uma fina atmosfera ao redor de um pequeno&nbsp;objeto<\/p>\n","protected":false},"author":3,"featured_media":5101,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[39],"class_list":["post-5100","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mundo","tag-destaque"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Astr\u00f4nomos descobrem atmosfera em pequeno mundo gelado nos &#039;confins&#039; do Sistema Solar - Portal Amazonas 9<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/portalam9.com.br\/?p=5100\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Astr\u00f4nomos descobrem atmosfera em pequeno mundo gelado nos &#039;confins&#039; 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