{"id":10964,"date":"2024-10-30T08:00:00","date_gmt":"2024-10-30T07:00:00","guid":{"rendered":"https:\/\/www.blog.neoprog.eu\/?p=10964"},"modified":"2024-10-28T17:34:54","modified_gmt":"2024-10-28T16:34:54","slug":"les-nuits-de-la-comete","status":"publish","type":"post","link":"https:\/\/www.blog.neoprog.eu\/index.php\/2024\/10\/30\/les-nuits-de-la-comete\/","title":{"rendered":"Les nuits de la com\u00e8te"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"468\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Comete-4.jpg\" alt=\"\" class=\"wp-image-10965\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Comete-4.jpg 1024w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Comete-4-300x137.jpg 300w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Comete-4-768x351.jpg 768w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Comete-4-500x229.jpg 500w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Apr\u00e8s une apparition \u00e9clair <a href=\"https:\/\/www.blog.neoprog.eu\/index.php\/2024\/10\/09\/mais-quest-ce-que-je-fou-ici\/\">\u00e0 l\u2019aube du 28 septembre<\/a>, la com\u00e8te Tsuchinshan-Atlas est pass\u00e9e derri\u00e8re le soleil pour revenir le soir. Les instruments point\u00e9s vers l\u2019Est se sont retourn\u00e9s \u00e0 l\u2019Ouest en esp\u00e9rant que la m\u00e9t\u00e9o soit favorable. Car la com\u00e8te s\u2019\u00e9loigne maintenant du soleil \u00e0 toute vitesse et devient de moins en moins visible.&nbsp;<\/p>\n\n\n\n<p>H\u00e9las le temps fut des plus perturb\u00e9 en Alsace, r\u00e9duisant d\u2019autant les fen\u00eatres d\u2019observation. A peine visible \u00e0 partir de 18h30, l\u2019astre disparaissait sous l\u2019horizon avant 22h et \u00e0 chaque fois il fallait compter avec les nuages et le soleil couchant.&nbsp;<\/p>\n\n\n\n<p>Equip\u00e9 d\u2019un simple appareil photo et d\u2019un tr\u00e9pied je scrutais chaque soir les pr\u00e9visions dans l\u2019espoir de trouver une courte fen\u00eatre pour observer l\u2019objet. En une semaine, j\u2019ai dispos\u00e9 de deux cr\u00e9neaux acceptables, le lundi et le samedi.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"681\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Comete-2.jpg\" alt=\"\" class=\"wp-image-10966\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Comete-2.jpg 1024w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Comete-2-300x200.jpg 300w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Comete-2-768x511.jpg 768w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Comete-2-451x300.jpg 451w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Le lundi le ciel \u00e9tait nuageux mais laissait suffisamment entrevoir le ciel bleu par moment pour garder espoir. J\u2019ai pris la voiture avant le coucher du soleil pour grimper sur une colline avec un horizon Ouest d\u00e9gag\u00e9 sur les Vosges. Le tr\u00e9pied plant\u00e9 dans la boue d\u2019un champ de ma\u00efs, l\u2019objectif grand angle point\u00e9 vers l\u2019occident, j\u2019ai commenc\u00e9 des pauses longues pour tenter de trouver la com\u00e8te aid\u00e9 \u00e9galement par la pr\u00e9cieuse application Stellarium. L\u2019\u00e9toile repaire \u00e9tait Arcturus dans le Bouvier avec la plan\u00e8te Venus vers la fin de la semaine. Si je les trouvais, je devais tomber sur la chevelure et le noyau.&nbsp;<\/p>\n\n\n\n<p>Dix secondes de pause, 2000 ISO, f\/d 2.8, 24 mm et un retardateur de 5 secondes, je commen\u00e7ais une s\u00e9rie de&nbsp; photos pour rep\u00e9rer l\u2019objet. Car il ne faisait pas encore nuit et les nuages associ\u00e9s \u00e0 la pollution lumineuse rendait la com\u00e8te invisible \u00e0 l\u2019oeil nu.<\/p>\n\n\n\n<p>Le premier soir, les nuages mass\u00e9s \u00e0 l\u2019horizon jou\u00e8rent longtemps \u00e0 cache cache avec la chevelure avant que je ne la trouve. Mais elle \u00e9tait bien l\u00e0. Alors j\u2019ai zoom\u00e9 dessus, r\u00e9duit le temps de pose pour \u00e9viter que les \u00e9toiles ne bougent sur l\u2019image et j\u2019ai commenc\u00e9 \u00e0 immortaliser l\u2019astre vagabond. J\u2019ai jou\u00e9 avec les nuages, la com\u00e8te et les lueurs du couchant pour obtenir un clich\u00e9 plus artistique que scientifique.&nbsp;<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Comete-1.jpg\" alt=\"\" class=\"wp-image-10967\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Comete-1.jpg 1024w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Comete-1-300x169.jpg 300w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Comete-1-768x432.jpg 768w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Comete-1-500x281.jpg 500w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Apr\u00e8s quelques photos le spectacle \u00e9tait termin\u00e9, Tsuchinshan-Atlas passait derri\u00e8re les nuages et les Vosges. Il faudrait attendre la prochaine occasion, s\u2019il y en avait une.<\/p>\n\n\n\n<p>Le samedi soir, le ciel semblait encore plus incertain. Mais un coup d\u2019oeil aux mod\u00e8les de pr\u00e9vision de M\u00e9t\u00e9o-France vers 17h me firent esp\u00e9rer une \u00e9claircies possible. Alors j\u2019ai repris le chemin de ma colline, choisissant un nouveau spot moins boueux et plus \u00e9lev\u00e9. Michel, un des copains de la SAFGA m\u2019a retrouv\u00e9 l\u00e0 et ensemble nous avons commenc\u00e9 \u00e0 chercher la com\u00e8te.<\/p>\n\n\n\n<p>Le ciel \u00e9tait vraiment charg\u00e9. Une bande de ciel bleu s\u2019\u00e9talait sur quelques degr\u00e9s, trop basse pour laisser voir Tsuchinshan-Atlas. Mais au fil des minutes les pr\u00e9visions ont tenu leurs promesses et la com\u00e8te est sortie des nuages.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Comete-3.jpg\" alt=\"\" class=\"wp-image-10968\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Comete-3.jpg 1024w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Comete-3-300x300.jpg 300w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Comete-3-150x150.jpg 150w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Comete-3-768x768.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Entre deux conseils \u00e0 Michel sur les r\u00e9glages de son bridge j\u2019ai commenc\u00e9 les photos. Encore une fois j\u2019ai opt\u00e9 pour un grand angle afin de capturer le paysage en m\u00eame temps que la com\u00e8te. Je n\u2019avais pas envie de faire de l\u2019astronomie, juste des jolies images pour me faire plaisir. Dans mon champ tr\u00f4nait un arbre d\u00e9j\u00e0 d\u00e9pouill\u00e9 de ses feuilles qui pouvait constituer un premier plan en ombre chinoise. A l\u2019horizon tra\u00eenait une couche nuageuse l\u00e9g\u00e8rement teint\u00e9e de rouge et le ciel \u00e9toil\u00e9 avec la com\u00e8te descendant en diagonale terminait le tableau.<\/p>\n\n\n\n<p>Des promeneurs venu du village voisin ont tent\u00e9 leur chance au smartphone pour voir la com\u00e8te avant de se rabattre sur les jumelles de Michel et les \u00e9crans de nos appareils. Un autre photographe est arriv\u00e9 un peu plus tard pour r\u00e9aliser avec son boitier OM System des images \u00e0 main lev\u00e9e de l\u2019astre voyageur. C\u2019est beau la stabilisation !<\/p>\n\n\n\n<p>Vers 21h30 Tsuchinshan-Atlas a commenc\u00e9 \u00e0 se noyer dans la pollution lumineuse de l\u2019horizon et la lumi\u00e8re de la lune montant \u00e0 l\u2019Est. Nous avons remball\u00e9 le mat\u00e9riel pour rentrer dans nos foyers respectifs.&nbsp;<\/p>\n\n\n\n<p>Le mercredi suivant (c&rsquo;est \u00e0 dire cette semaine), le ciel s&rsquo;est montr\u00e9 sous son beau visage. Une journ\u00e9e ensoleill\u00e9e et une nuit relativement peu nuageuse. Avec Fran\u00e7ois, un autre astronome amateur de l&rsquo;association, nous sommes partis sur les hauteurs de Rosheim, dans le vignoble, un site bien d\u00e9gag\u00e9 et pas trop pollu\u00e9 par les lumi\u00e8res, pour observer une fois encore la com\u00e8te.<\/p>\n\n\n\n<p>Cette fois j&rsquo;avais emmen\u00e9 l&rsquo;artillerie lourde : appareil photo, monture \u00e9quatoriale, lunette de 72 et t\u00e9lescope de 200. L&rsquo;objectif premier \u00e9tait de photographier la com\u00e8te \u00e0 la lunette puis de partir sur une n\u00e9buleuse \u00e0 l&rsquo;Est.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"437\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/comete-5.jpg\" alt=\"\" class=\"wp-image-10985\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/comete-5.jpg 1024w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/comete-5-300x128.jpg 300w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/comete-5-768x328.jpg 768w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/comete-5-500x213.jpg 500w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Cette fois, la com\u00e8te \u00e9tait visible \u00e0 l&rsquo;oeil nu en sachant o\u00f9 chercher. Elle \u00e9tait \u00e9galement assez haute dans le ciel, loin du soleil couchant donc plus facile \u00e0 observer. En parall\u00e8le j&rsquo;ai photographi\u00e9 la com\u00e8te au 24 mm sur mon tr\u00e9pied et avec la lunette et sa cam\u00e9ra. 20 images de 30 secondes.<\/p>\n\n\n\n<p>Sauf que le traitement des photographies s&rsquo;est r\u00e9v\u00e9l\u00e9 un v\u00e9ritable chemin de croix. J&rsquo;ai proc\u00e9d\u00e9 \u00e0 plus d&rsquo;une dizaine d&#8217;empilements avec syst\u00e9matiquement un d\u00e9faut dans le noyau de la com\u00e8te jusqu&rsquo;\u00e0 que je renonce \u00e0 utiliser les fichiers de calibration normalement indispensables. Le r\u00e9sultat est fatalement un peu d\u00e9cevant mais je travaille \u00e0 r\u00e9soudre le probl\u00e8me pour obtenir une meilleure image.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"1024\" src=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Tsuchinshan-ATLAS-1024x1024.jpg\" alt=\"\" class=\"wp-image-10981\" srcset=\"https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Tsuchinshan-ATLAS-1024x1024.jpg 1024w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Tsuchinshan-ATLAS-300x300.jpg 300w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Tsuchinshan-ATLAS-150x150.jpg 150w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Tsuchinshan-ATLAS-768x768.jpg 768w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Tsuchinshan-ATLAS-1536x1536.jpg 1536w, https:\/\/www.blog.neoprog.eu\/wp-content\/uploads\/2024\/10\/Tsuchinshan-ATLAS.jpg 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>La com\u00e8te est maintenant tr\u00e8s \u00e9loign\u00e9e de nous, elle perd en luminosit\u00e9 d&rsquo;heures en heures et je vais retourner \u00e0 la lune, aux plan\u00e8tes, aux n\u00e9buleuses, galaxies et amas avant qu&rsquo;un nouvel astre errant vienne illuminer nos nuits.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dix secondes de pause, 2000 ISO, f\/d 2.8, 24 mm et un retardateur de 5 secondes, je commen\u00e7ais une s\u00e9rie de\u00a0 photos pour rep\u00e9rer l\u2019objet. <a href=\"https:\/\/www.blog.neoprog.eu\/index.php\/2024\/10\/30\/les-nuits-de-la-comete\/\">Continuer la lecture <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":10965,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"footnotes":""},"categories":[1],"tags":[185,2303,875,3317],"class_list":["post-10964","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-non-classe","tag-astronomie","tag-comete","tag-photographie","tag-tsuchinshan-atlas","post_format-post-format-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - 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