{"id":7961,"date":"2005-04-17T11:59:07","date_gmt":"2005-04-17T11:59:07","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/m51-2\/"},"modified":"2025-06-19T19:04:49","modified_gmt":"2025-06-19T17:04:49","slug":"m51-2","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/m51-2\/","title":{"rendered":"M51"},"content":{"rendered":"<p>Auteur: Didier Keus (dk31t5@skynet.be)<\/p>\n<p>Voici mon premier essai de la galaxie tourbillon, Messier 51 (NGC 5194 + NGC 5195) dans les Chiens de Chasse.<br \/>\nR\u00e9alis\u00e9e depuis mon jardin (h\u00e9las trop proche des lumi\u00e8res de la ville de Verviers).<\/p>\n<p>J&rsquo;ai essay\u00e9 (je crois avec succ\u00e8s) l&rsquo;autoguidage avec la ST-10 et la 900GTO, et c&rsquo;est finalement relativement facile: calibrer la monture, choisir une \u00e9toile guide et r\u00e9aliser l&rsquo;image se fait ais\u00e9ment dans ma configuration.<\/p>\n<p>Heure d&rsquo;\u00e9t\u00e9 et raccourcissement des nuits oblige (vous me direz qu&rsquo;il ne g\u00e8le plus c&rsquo;est vrai), la s\u00e9ance n&rsquo;aura d\u00e9but\u00e9 que vers 21 heures pour se terminer peu apr\u00e8s minuit, pour finalement moins d&rsquo;une heure d&rsquo;exposition sur l&rsquo;objet choisi (avec quelques essais erreurs de votre serviteur&#8230;).<\/p>\n<p>Ici, 4 poses de 5 minutes pour r\u00e9aliser la luminance; ainsi que (histoire de mettre un peu de couleurs) 1 pose de 6 minutes pour les image rouges et vertes en utilisant la fonction track and accumulate (le soft additionne des poses de 1 minutes) et une pose de 9 minutes pour le bleu avec la m\u00eame technique; le tout en binning 1&#215;1.<br \/>\nJ&rsquo;ai finalement r\u00e9alis\u00e9 quelques darks de 5 minutes pendant le rangement du mat\u00e9riel.<\/p>\n<p>Soustraction du dark donc, ajustement du fond de ciel (IRIS), niveaux (Photoshop) et enfin suppression de deux traces de satellites&#8230;<br \/>\nOn aper\u00e7oit encore les galaxies IC 4277 , IC 4278 \u00e0 proximit\u00e9 de M51, ainsi que IC 4263, galaxie allong\u00e9e dans le coin sup\u00e9rieur droit.<\/p>\n<p><a href=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2025\/06\/7_20050417-M51.jpg\" data-lbwps-width=\"800\" data-lbwps-height=\"600\" data-lbwps-srcsmall=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2025\/06\/7_20050417-M51-300x225.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium\" src=\"https:\/\/groupeastronomiespa.be\/astrogas\/wp-content\/uploads\/2025\/06\/7_20050417-M51-300x225.jpg\" alt=\"\" width=\"300\" height=\"225\" \/><\/a><\/p>\n<p>Didier<\/p>\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;7961&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;0&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;0&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;0\\\/10 - (0 vote)&quot;,&quot;size&quot;:&quot;18&quot;,&quot;title&quot;:&quot;M51&quot;,&quot;width&quot;:&quot;0&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: 0px;\">\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            <span class=\"kksr-muted\">Veuillez voter<\/span>\n    <\/div>\n    <\/div>\n","protected":false},"excerpt":{"rendered":"<p>Auteur: Didier Keus (dk31t5@skynet.be) Voici mon premier essai de la galaxie tourbillon, Messier 51 (NGC 5194 + NGC 5195) dans les Chiens de Chasse. R\u00e9alis\u00e9e depuis mon jardin (h\u00e9las trop proche des lumi\u00e8res de la ville de Verviers). J&rsquo;ai essay\u00e9 (je crois avec succ\u00e8s) l&rsquo;autoguidage avec la ST-10 et la 900GTO, et c&rsquo;est finalement relativement [&hellip;]<\/p>\n","protected":false},"author":7,"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-7961","post","type-post","status-publish","format-standard","hentry","category-astrophotos"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/7961","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\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/comments?post=7961"}],"version-history":[{"count":2,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/7961\/revisions"}],"predecessor-version":[{"id":15222,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/7961\/revisions\/15222"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=7961"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=7961"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=7961"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}