{"id":17193,"date":"2026-07-24T20:56:08","date_gmt":"2026-07-24T18:56:08","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/?p=17193"},"modified":"2026-07-24T20:56:42","modified_gmt":"2026-07-24T18:56:42","slug":"saturne-et-spokes","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/saturne-et-spokes\/","title":{"rendered":"Saturne et spokes ?"},"content":{"rendered":"<p>La nuit derni\u00e8re, je voulais essayer \u00e0 nouveau de v\u00e9rifier si l&rsquo;atmosph\u00e8re terrestre allait se calmer un peu au niveau de la turbulence pour imager la plan\u00e8te Saturne.<br \/>\nL&rsquo;extinction de l&rsquo;\u00e9clairage public \u00e0 minuit a permis de voir un ciel magnifique avec la Voie lact\u00e9e bien pr\u00e9sente. Il faisait frais (environ 10\u00b0C).<br \/>\nJ&rsquo;ai ensuite attendu jusqu&rsquo;\u00e0 3h du matin pour voir arriver la plan\u00e8te aux anneaux bien au-dessus de l&rsquo;horizon Est.<br \/>\nLa turbulence \u00e9tait dantesque, m\u00eame plus que les nuits pr\u00e9c\u00e9dentes. L&rsquo;astronomie \u00e9tant une \u00e9cole de patience et \u00e0 force de caf\u00e9s, j&rsquo;ai alors attendu que le jour se l\u00e8ve. Un peu avant 5h du matin, le seeing s&rsquo;est un peu am\u00e9lior\u00e9. J&rsquo;ai ai profit\u00e9 pour capturer la belle aux anneaux.<br \/>\nCes anneaux sont baptis\u00e9s A, B et C en partant de l&rsquo;ext\u00e9rieur de la plan\u00e8te.<br \/>\nL&rsquo;anneau C est tr\u00e8s sombre et le plus proche de Saturne.<br \/>\nL&rsquo;anneau B est le plus large (environ 26000 km) et est situ\u00e9 avant la s\u00e9paration sombre appel\u00e9e la \u00ab\u00a0Division de Cassini\u00a0\u00bb puis vient ensuite l&rsquo;anneaux ext\u00e9rieur A.<br \/>\nIl me semble deviner dans cet anneau B des taches (ou spokes) cr\u00e9\u00e9es par des interactions \u00e9lectromagn\u00e9tiques entre le champ magn\u00e9tique de la plan\u00e8te et des poussi\u00e8res en suspension et le vent solaire. Ils furent notamment photographi\u00e9s par la sonde spatiale Voyager 2 en 1981.<br \/>\nLes voyez-vous aussi ? Difficile certainement \u00e0 bien visualiser sur un smartphone.<br \/>\nNote : je me trompe peut-\u00eatre lourdement et ce ne sont pas les spokes. Si un observateur saturnien passe par l\u00e0, qu&rsquo;il n&rsquo;h\u00e9site pas \u00e0 me corriger \ud83d\ude09<\/p>\n<p>&nbsp;<\/p>\n<div id=\"attachment_17194\" style=\"width: 310px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2026\/07\/2026-07-24-0241_Astrosurface_PS-copie.jpg\" data-lbwps-width=\"880\" data-lbwps-height=\"546\" data-lbwps-srcsmall=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2026\/07\/2026-07-24-0241_Astrosurface_PS-copie-300x186.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-17194\" class=\"size-medium wp-image-17194\" src=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2026\/07\/2026-07-24-0241_Astrosurface_PS-copie-300x186.jpg\" alt=\"Saturne le 24 juillet vers 5h du matin\" width=\"300\" height=\"186\" \/><\/a><p id=\"caption-attachment-17194\" class=\"wp-caption-text\">Saturne le 24 juillet vers 5h du matin<\/p><\/div>\n\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-left kksr-valign-bottom\"\n    data-payload='{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;17193&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;bottom&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;7&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;10&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;10&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;Veuillez voter&quot;,&quot;legend&quot;:&quot;10\\\/10 - (7 votes)&quot;,&quot;size&quot;:&quot;18&quot;,&quot;title&quot;:&quot;Saturne et spokes ?&quot;,&quot;width&quot;:&quot;227.5&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"6\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"7\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"8\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"9\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"10\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 227.5px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 18px; height: 18px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 14.4px;\">\n            10\/10 - (7 votes)    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>La nuit derni\u00e8re, je voulais essayer \u00e0 nouveau de v\u00e9rifier si l&rsquo;atmosph\u00e8re terrestre allait se calmer un peu au niveau de la turbulence pour imager la plan\u00e8te Saturne. L&rsquo;extinction de l&rsquo;\u00e9clairage public \u00e0 minuit a permis de voir un ciel magnifique avec la Voie lact\u00e9e bien pr\u00e9sente. Il faisait frais (environ 10\u00b0C). J&rsquo;ai ensuite attendu [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[2],"tags":[],"class_list":["post-17193","post","type-post","status-publish","format-standard","hentry","category-astrophotos"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/17193","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/comments?post=17193"}],"version-history":[{"count":2,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/17193\/revisions"}],"predecessor-version":[{"id":17196,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/17193\/revisions\/17196"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=17193"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=17193"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=17193"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}