{"id":11371,"date":"2025-03-26T08:00:00","date_gmt":"2025-03-26T07:00:00","guid":{"rendered":"https:\/\/www.blog.neoprog.eu\/?p=11371"},"modified":"2025-03-21T12:50:20","modified_gmt":"2025-03-21T11:50:20","slug":"planification","status":"publish","type":"post","link":"https:\/\/www.blog.neoprog.eu\/index.php\/2025\/03\/26\/planification\/","title":{"rendered":"Planification"},"content":{"rendered":"\n
\"\"<\/figure>\n\n\n\n

Avant de partir en montagne pour une nuit d\u2019observation, il est utile de pr\u00e9parer sa sortie. <\/p>\n\n\n\n

La premi\u00e8re chose \u00e0 laquelle on songe naturellement c\u2019est \u00e0 l\u2019\u00e9quipement, la charge des batteries, les v\u00eatements et la nourriture.\u00a0<\/p>\n\n\n\n

Certes c\u2019est important, m\u00eame essentiel au bon d\u00e9roulement d\u2019une nuit d\u2019astronomie, mais cela ne suffit pas. Avant de partir, il faut d\u00e9cider de l\u2019objet que l\u2019on va photographier.<\/p>\n\n\n\n

Des objets, il en existe une multitude dans le ciel, la lune, les plan\u00e8tes, les galaxies, les n\u00e9buleuses, les amas d\u2019\u00e9toiles, les com\u00e8tes. Tous ne sont pas visibles aux m\u00eames latitudes et certains ne sont bien plac\u00e9s qu\u2019\u00e0 certaines p\u00e9riodes de l\u2019ann\u00e9e.<\/p>\n\n\n\n

Ensuite certaines n\u00e9buleuses ou galaxies requi\u00e8rent un champ large alors que d\u2019autres sont tellement petites qu\u2019une grande focale est pr\u00e9f\u00e9rable. Certains objets sont tr\u00e8s lumineux, comme les plan\u00e8tes, d\u2019autres sont invisibles \u00e0 l\u2019\u0153il nu et m\u00eame dans un bon t\u00e9lescope.<\/p>\n\n\n\n

Avant de partir, se pose donc la d\u00e9licate question du \u00ab\u00a0que vais-je photographier ce soir ?\u00a0\u00bb. Pour moi la liste est longue puisque je d\u00e9bute. Mais pour certains objets, il faudra que j\u2019attende l\u2019arriv\u00e9e de l\u2019\u00e9t\u00e9. Pour d\u2019autres, j\u2019ai d\u00e9j\u00e0 loup\u00e9 le coche. Il me faudra patienter jusqu\u2019\u00e0 l\u2019hiver prochain.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Alors j\u2019ouvre l\u2019application Stellarium, consulte le num\u00e9ro sp\u00e9cial de Ciel et Espace, recherche la note intitul\u00e9e Observation dans mon smartphone o\u00f9 je stocke les objets que je r\u00eave d\u2019ajouter \u00e0 mon tableau de chasse, et je regarde s\u2019ils seront visibles dans le ciel du soir. <\/p>\n\n\n\n

\u00c0 quelle heure se l\u00e8ve-t-il , \u00e0 quelle hauteur culminera-t-il \u00e0 l\u2019horizon, \u00e0 quelle heure se couchera-t-il, quelle est sa luminosit\u00e9 et quelle est sa taille. Je ne me pose pas encore la question de quel de filtres utiliser pour le photographier car pour l\u2019instant je n\u2019utilise aucun filtre mais cela rentrera sans doute bient\u00f4t dans mes crit\u00e8res.<\/p>\n\n\n\n

L\u2019astro photographe a besoin id\u00e9alement d\u2019un objet qui reste longtemps visible pour maximiser le temps de capture et qui soit assez haut dans le ciel afin d\u2019avoir moins de perturbations atmosph\u00e9riques. Ensuite, en fonction de sa taille, il va falloir choisir l\u2019instrument adapt\u00e9. Ma lunette avec son r\u00e9ducteur de focale et la cam\u00e9ra couvre un champ qui poss\u00e8de une largeur repr\u00e9sentant un centi\u00e8me du ciel. Mon t\u00e9lescope lui voit une zone six fois plus petite. Pour vous donner un ordre de grandeur, la Lune fait environ un demi degr\u00e9 d\u2019angle angulaire. Donc dans la lunette je pourrais mettre neuf lunes alors que dans le t\u00e9lescope elle ne tient pas totalement, du moins avec la cam\u00e9ra que je poss\u00e8de.<\/p>\n\n\n\n

Le choix de l\u2019objet conditionne donc le mat\u00e9riel \u00e0 emmener pour l\u2019observation. Il faut \u00e9galement bien \u00e9tudier cible, savoir si des \u00e9toiles brillantes vont perturber la photographie, pour bien doser le temps d\u2019exposition, v\u00e9rifier si on ne se trouve pas en plein radiant d\u2019\u00e9toiles filantes, dans l\u2019axe d\u2019un a\u00e9roport, si la Lune ne va pas \u00eatre trop proche ce soir l\u00e0. Bref plein de param\u00e8tres qui vont d\u00e9terminer ce que l\u2019on va photographier.<\/p>\n\n\n\n

Evidemment, arriv\u00e9 l\u00e0 haut, il ne faut pas qu\u2019il ait des nuages\u2026<\/p>\n","protected":false},"excerpt":{"rendered":"

Des objets, il en existe une multitude dans le ciel, la lune, les plan\u00e8tes, les galaxies, les n\u00e9buleuses, les amas d\u2019\u00e9toiles, les com\u00e8tes. Continuer la lecture →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":11372,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"footnotes":""},"categories":[2810,7],"tags":[185,1116,351,3466,3467,1113],"class_list":["post-11371","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-astro","category-photo","tag-astronomie","tag-focale","tag-materiel","tag-objets","tag-planification","tag-preparation","post_format-post-format-image"],"yoast_head":"\nPlanification - Le Blog du N\u00e9oprog<\/title>\n<meta name=\"description\" content=\"Des objets, il en existe une multitude dans le ciel, la lune, les plan\u00e8tes, les galaxies, les n\u00e9buleuses, les amas d\u2019\u00e9toiles, les com\u00e8tes.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.blog.neoprog.eu\/index.php\/2025\/03\/26\/planification\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Planification - 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