{"id":19916,"date":"2024-09-04T14:07:19","date_gmt":"2024-09-04T14:07:19","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=19916"},"modified":"2024-09-11T11:55:58","modified_gmt":"2024-09-11T11:55:58","slug":"comment-reussir-vos-photographies-planetaires","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/09\/04\/comment-reussir-vos-photographies-planetaires\/","title":{"rendered":"Comment r\u00e9ussir vos photographies plan\u00e9taires"},"content":{"rendered":"<p><strong>Vous avez envie de r\u00e9aliser de belles images plan\u00e9taires ? Nous avons demand\u00e9 \u00e0 Jean-Paul Oger de nous donner quelques conseils.<\/strong><\/p>\n<h5>Semestre plan\u00e9taire :<\/h5>\n<p>Cela ne vous a sans doute pas \u00e9chapp\u00e9, mais nous sommes entr\u00e9s dans une p\u00e9riode faste pour les amoureux des plan\u00e8tes. Les oppositions vont se succ\u00e9der : Saturne le 8 septembre, Jupiter le 7 d\u00e9cembre et Mars le 16 janvier 2025. Une suite de rapprochements tr\u00e8s favorables qui pourraient vous donner envie d&#8217;immortaliser ces astres. Pour mettre toutes les chances de votre c\u00f4t\u00e9, voici les conseils de l&#8217;astrophotographe Jean-Paul Oger (\u00e0 suivre sur <a href=\"https:\/\/www.instagram.com\/jeanpaul_oger\/\" target=\"_blank\" rel=\"noopener\">Instagram<\/a>), dont les superbes images illustrent cet article :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/08\/jpoger2.jpg\" rel=\"lightbox[19916]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-19920\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/08\/jpoger2-450x450.jpg\" alt=\"\" width=\"450\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/08\/jpoger2-450x450.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/08\/jpoger2-150x150.jpg 150w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/08\/jpoger2-768x768.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/08\/jpoger2.jpg 800w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<h5>Bien choisir son mat\u00e9riel :<\/h5>\n<ul>\n<li><strong>L&#8217;instrument :<\/strong> privil\u00e9giez les t\u00e9lescopes plut\u00f4t que les lunettes. Un mod\u00e8le du type Cassegrain ou Dall-Kirkham est parfait, mais on peut opter pour un Newton de gros diam\u00e8tre ou un Schmidt-Cassegrain. Bien que de qualit\u00e9, le Maksutov est limit\u00e9 en diam\u00e8tre. Quant au Ritchey-Chr\u00e9tien, il a une obstruction centrale trop importante\u00a0 \u00e0 l&#8217;origine d&#8217;une perte de contraste.<\/li>\n<li><strong>La cam\u00e9ra :<\/strong> les capteurs couleurs permettent aujourd&#8217;hui de r\u00e9aliser de tr\u00e8s bonnes images. Mais si le <a href=\"https:\/\/media4.obspm.fr\/public\/ressources_lu\/pages_oa\/seeing_impression.html#:~:text=la%20tache%20image.-,Le%20seeing,%C3%A9galement%20celui%20de%20l'agitation.\" target=\"_blank\" rel=\"noopener\">seeing<\/a> est excellent, une cam\u00e9ra N et B avec des filtres sera encore plus performante.<\/li>\n<\/ul>\n<figure id=\"attachment_20057\" aria-describedby=\"caption-attachment-20057\" style=\"width: 345px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/jpoger.jpg\" rel=\"lightbox[19916]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-20057\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/jpoger-345x450.jpg\" alt=\"\" width=\"345\" height=\"450\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/jpoger-345x450.jpg 345w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/jpoger-786x1024.jpg 786w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/jpoger-768x1000.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/jpoger.jpg 945w\" sizes=\"auto, (max-width: 345px) 100vw, 345px\" \/><\/a><figcaption id=\"caption-attachment-20057\" class=\"wp-caption-text\">S\u00e9ance d&#8217;astrophoto au T400 mm. \u00a9 Jean-Paul Oger<\/figcaption><\/figure>\n<ul>\n<li><strong>L&#8217;indispensable ADC :<\/strong> apparu depuis quelques ann\u00e9es, le correcteur de dispersion atmosph\u00e9rique ou ADC est un petit accessoire indispensable sous nos latitudes. Plus les plan\u00e8tes sont basses et plus l&#8217;atmosph\u00e8re agit comme un prisme en cr\u00e9ant des liser\u00e9s color\u00e9s sur le bord des astres. L&#8217;ADC permet d&#8217;\u00e9liminer la plus grande partie de ces d\u00e9fauts qui affectent la r\u00e9solution finale des images.<\/li>\n<\/ul>\n<p><!--more--><\/p>\n<h5>Bien pr\u00e9parer sa soir\u00e9e :<\/h5>\n<ul>\n<li><strong>Le site d&#8217;observation :<\/strong> la proximit\u00e9 d&#8217;une for\u00eat ou d&#8217;un \u00e9tang est souvent gage d&#8217;une meilleure stabilit\u00e9 du ciel. Mais on peut aussi parfaitement imager en ville puisque la <a href=\"https:\/\/www.futura-sciences.com\/planete\/breves\/pollution-bonne-nouvelle-pollution-lumineuse-regresse-france-7549\/\" target=\"_blank\" rel=\"noopener\">pollution lumineuse<\/a> n&#8217;est pas une g\u00eane (\u00e9vitez quand m\u00eame de vous mettre sous un lampadaire !).<\/li>\n<li><strong>Les conditions m\u00e9t\u00e9orologiques :<\/strong>\u00a0 privil\u00e9giez les nuits fra\u00eeches sans nuage avec un jet stream entre 15 et 27 m\u00e8tres\/seconde. Consultez des sites comme <a href=\"https:\/\/www.meteoblue.com\/fr\" target=\"_blank\" rel=\"noopener\">M\u00e9t\u00e9o Blue<\/a>, <a href=\"https:\/\/www.ventusky.com\/\" target=\"_blank\" rel=\"noopener\">Ventusky<\/a> ou encore <a href=\"https:\/\/www.skippysky.com.au\/Europe\/\" target=\"_blank\" rel=\"noopener\">Skippysky<\/a> pour conna\u00eetre le seeing.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/08\/collimation.jpg\" rel=\"lightbox[19916]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-19923\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/08\/collimation-450x274.jpg\" alt=\"\" width=\"450\" height=\"274\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/08\/collimation-450x274.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/08\/collimation-768x468.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/08\/collimation.jpg 800w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<ul>\n<li><strong>La collimation :<\/strong> elle est diff\u00e9rente selon l&#8217;instrument. <span style=\"text-decoration: underline\">Schmidt-Cassegrain <\/span>: on agit sur les vis du miroir secondaire en observant la t\u00e2che d&#8217;Airy form\u00e9e par une \u00e9toile brillante. <span style=\"text-decoration: underline\">Newton<\/span> : idem, sinon utilisez un laser de collimation. <span style=\"text-decoration: underline\">Cassegrain<\/span> : on r\u00e8gle d&#8217;abord le miroir secondaire avec un microscope de collimation, puis le miroir primaire sur une \u00e9toile. <strong>N&#8217;h\u00e9sitez pas \u00e0 refaire la collimation de votre instrument \u00e0 l&#8217;occasion de chaque sortie.<\/strong><\/li>\n<\/ul>\n<h5>Passez \u00e0 l&#8217;action :<\/h5>\n<ul>\n<li><strong>L&#8217;\u00e9chantillonnage<\/strong> : c&#8217;est la portion angulaire du ciel vue par un pixel du capteur de votre cam\u00e9ra. En imagerie plan\u00e9taire, l&#8217;\u00e9chantillonnage le mieux adapt\u00e9 correspond \u00e0 un rapport F\/D=20. Selon les instruments, un tel rapport F\/D n\u00e9cessitera l&#8217;emploi d&#8217;une lentille de Barlow X2 ou X3.<\/li>\n<\/ul>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/jpoger10.jpg\" rel=\"lightbox[19916]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-20071\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/jpoger10-450x386.jpg\" alt=\"\" width=\"450\" height=\"386\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/jpoger10-450x386.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/jpoger10.jpg 700w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<ul>\n<li><strong>Les param\u00e8tres de la prise de vue : <\/strong>choisir des temps d&#8217;exposition de 10-20 ms pour Jupiter, 20 ms pour Saturne et 5-6 ms pour Mars. Dur\u00e9e des vid\u00e9os : en raison du mouvement de rotation des plan\u00e8tes, ne pas d\u00e9passer 120 secondes pour Jupiter. Concernant Mars et Saturne, on peut aller jusqu&#8217;\u00e0 240 secondes. Le gain est r\u00e9gl\u00e9 \u00e0 70 %, les couches couleurs sont align\u00e9es pendant les captures pour un bon rendu colorim\u00e9trique (graphique couleur de l&#8217;histogramme).<\/li>\n<li><strong>Les filtres :<\/strong> un filtre UV\/IR-Cut \/ L corrige l&#8217;\u00e9quilibre des couleurs (m\u00eame avec une cam\u00e9ra monochrome) et permet d&#8217;avoir une transmission de 98 % de l&#8217;ensemble du spectre visible (de 420 \u00e0 685 nm).<\/li>\n<\/ul>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/jpoger8.jpg\" rel=\"lightbox[19916]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-20072\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/jpoger8-450x332.jpg\" alt=\"\" width=\"450\" height=\"332\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/jpoger8-450x332.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/09\/jpoger8.jpg 700w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<ul>\n<li><strong>Le traitement :<\/strong> <a href=\"https:\/\/www.autostakkert.com\/\" target=\"_blank\" rel=\"noopener\">Autostakkert 4<\/a> permettra d&#8217;aligner les images des vid\u00e9os. Le r\u00e9sultat sera ensuite trait\u00e9 dans <a href=\"http:\/\/astrosurface.com\/\" target=\"_blank\" rel=\"noopener\">AstroSurface<\/a>. Pour augmenter le signal tout en contrant la rotation rapide des plan\u00e8tes g\u00e9antes gazeuses, il faudra utiliser <a href=\"https:\/\/jupos.org\/gh\/download.htm\" target=\"_blank\" rel=\"noopener\">WinJUPOS<\/a>.<\/li>\n<\/ul>\n<p style=\"text-align: center\"><strong><em>Je remercie Jean-Paul Oger d&#8217;avoir bien voulu prendre le temps de nous faire profiter de ses conseils. De nombreux tutos sont \u00e9galement disponibles sur internet, on pourra s&#8217;y plonger avec profit.\u00a0\u00a0<\/em><\/strong><\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/12\/12\/fascinant-le-telescope-hubble-nous-invite-a-zoomer-sur-jupiter\/\" target=\"_blank\" rel=\"noopener\">Fascinant : le t\u00e9lescope Hubble nous invite \u00e0 zoomer sur Jupiter<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/05\/17\/pourquoi-certaines-planetes-font-elles-demi-tour\/\" target=\"_blank\" rel=\"noopener\">Pourquoi certaines plan\u00e8tes font-elles demi-tour ?<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/10\/03\/comment-admirer-la-danse-des-satellites-de-jupiter\/\" target=\"_blank\" rel=\"noopener\">Comment admirer la danse des satellites de Jupiter<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/a>.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Vous avez envie de r\u00e9aliser de belles images plan\u00e9taires ? Nous avons demand\u00e9 \u00e0 Jean-Paul Oger de nous donner quelques conseils. Semestre plan\u00e9taire : Cela ne vous a sans doute pas \u00e9chapp\u00e9, mais nous sommes entr\u00e9s dans une p\u00e9riode faste pour les amoureux des plan\u00e8tes. Les oppositions vont se succ\u00e9der : Saturne le 8 septembre, &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/09\/04\/comment-reussir-vos-photographies-planetaires\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Comment r\u00e9ussir vos photographies plan\u00e9taires<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":19930,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[86],"tags":[3620,3619,90,116,136],"class_list":["post-19916","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-soleil-et-planetes","tag-collimation","tag-jean-paul-oger","tag-jupiter","tag-mars","tag-saturne"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Comment r\u00e9ussir vos photographies plan\u00e9taires<\/title>\n<meta name=\"description\" content=\"Vous avez envie de r\u00e9aliser de belles images plan\u00e9taires ? 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