{"id":3114,"date":"2018-02-14T07:53:12","date_gmt":"2018-02-14T06:53:12","guid":{"rendered":"http:\/\/www.blog.neoprog.eu\/?p=3114"},"modified":"2018-02-14T07:53:12","modified_gmt":"2018-02-14T06:53:12","slug":"ngc-1976","status":"publish","type":"post","link":"https:\/\/www.blog.neoprog.eu\/index.php\/2018\/02\/14\/ngc-1976\/","title":{"rendered":"NGC 1976"},"content":{"rendered":"

\"\"<\/a>De 14 \u00e0 20 ans, j’ai pass\u00e9 mes samedis apr\u00e8s-midi dans un club d’astronomie, et mes nuit sous la vo\u00fbte \u00e9toil\u00e9e de la Bretagne. Le jour nous regardions des diapositives et fabriquions un t\u00e9lescope (un newton 260 mm), la nuit, nous observions la lune, les plan\u00e8tes, les galaxies, les n\u00e9buleuses, les amas stellaires, les com\u00e8tes et les voisines.<\/p>\n

Cette passion des \u00e9toiles ne m’a jamais quitt\u00e9, mais arriv\u00e9 en Alsace, sous la couche d’inversion et la pollution, comment dire, le ciel est s\u00e2le et troubl\u00e9 par des \u00e9clairages tr\u00e8s nombreux. M\u00eame avec la paye qui allait bien pour m’offrir un t\u00e9lescope, je n’ai jamais franchit le pas.<\/p>\n

\"\"<\/a>Pourtant, d\u00e8s que j’en ai l’occasion, je reste le nez en l’air \u00e0 contempler le ciel.\u00a0\u00ab\u00a0Espace<\/em>, fronti\u00e8re de l’infini<\/em>\u00a0vers lequel voyage notre vaisseau spatial.\u00a0\u00bb. Enfin vous voyez. Renouer avec la photographie a \u00e9t\u00e9 l’occasion de tourner \u00e0 nouveau mes yeux et mes objectifs vers les \u00e9toiles. La premi\u00e8re cible, la plus facile, fut la lune, objet de forte magnitude avec un diam\u00e8tre apparent non n\u00e9gligeable sur lequel j’ai \u00e9trenn\u00e9 mon Samyang 500 mm et plus r\u00e9cemment le 200-500 mm de chez Nikkor. J’ai photographi\u00e9 la lune sous toutes ses phases, \u00e0 toutes les sensibilit\u00e9s, \u00e0 de nombreux temps de pause pour arriver finalement \u00e0 cette photographie assez r\u00e9ussie au 1000 mm (500 mm et doubleur).<\/p>\n

Cette semaine, pour une fois que le ciel n’\u00e9tait pas trop bouch\u00e9, j’ai lev\u00e9 le nez gel\u00e9 pour d\u00e9couvrir devant moi la constellation d’Orion, une des c\u00e9l\u00e8bres constellations du ciel d’hiver. Dans celle ci, on peut voir, une n\u00e9buleuse, c’est \u00e0 dire un nuage de gaz color\u00e9. Il en existe de diverses vari\u00e9t\u00e9s, les r\u00e9sidus d’\u00e9toiles ayant explos\u00e9 comme M 21 du Cygne, des nuages opaques (la t\u00eate de cheval) et des pouponni\u00e8res d’\u00e9toiles comme M 42, la n\u00e9buleuse d’Orion.<\/p>\n

Je me suis dit, et si j’essayais ? Ni une ni deux, je pointe mon Nikkon \u00e9quip\u00e9 du doubleur et du 500 mm vers le baudrier d’Orion, et tente de retrouver cette n\u00e9buleuse. Pointer un appareil photo est nettement plus sportif que d’orienter un t\u00e9lescope \u00e9quip\u00e9 d’une lunette guide. Mais malgr\u00e9 cela, m’aidant de quelques souvenirs pass\u00e9s, je tombais sur le petit nuage de gaz et poussi\u00e8res dans le viseur du reflex. Oh joie !<\/p>\n

\"\"<\/a><\/p>\n

La photo ne poss\u00e8de aucun int\u00e9r\u00eat en soit, ce n’est qu’un petit machin flou au centre de l’image tr\u00e8s bruit\u00e9e apr\u00e8s tout, mais je suis content de l’avoir faite. Elle se situe \u00e0 1500 ann\u00e9es lumi\u00e8res, bref assez loin de chez nous et n’est pas visible \u00e0 l’oeil nu – magnitude 3.7, l’\u00e9toile la plus brillante est de -1.5, la lune de -30 -. Une pose tr\u00e8s br\u00e8ve – 1 seconde – pour de l’astronomie, mais je ne dispose pas de monture \u00e9quatoriale pour compenser la rotation de la terre (1 seconde =\u00a0 0.0041\u00b0 de d\u00e9placement). Cela me donne envie de renouer avec les \u00e9toiles, de coller mon \u0153il \u00e0 l\u2019oculaire d’un t\u00e9lescope et de partir \u00e0 la chasse aux com\u00e8tes et objets de faibles magnitude.<\/p>\n

En vrai avec un t\u00e9lescope de 2 m et plusieurs heures de pause, M 42 ressemble \u00e0 ceci, c’est dire si mon clich\u00e9 est minable, n\u2019emp\u00eache j’en suis content, comme quoi il ne faut pas grand chose pour contenter un quelqu’un comme moi…<\/p>\n

\"\"<\/a><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

De 14 \u00e0 20 ans, j’ai pass\u00e9 mes samedis apr\u00e8s-midi dans un club d’astronomie, et mes nuit sous la vo\u00fbte \u00e9toil\u00e9e de la Bretagne. Le jour nous regardions des diapositives et fabriquions un t\u00e9lescope (un newton 260 mm), la nuit, … Continuer la lecture →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"footnotes":""},"categories":[7],"tags":[311,185,834,833,835,836,178],"class_list":["post-3114","post","type-post","status-publish","format-image","hentry","category-photo","tag-alsace","tag-astronomie","tag-m42","tag-nebuleuses","tag-ngc-1976","tag-orion","tag-photo","post_format-post-format-image"],"yoast_head":"\nNGC 1976 - Le Blog du N\u00e9oprog<\/title>\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\/2018\/02\/14\/ngc-1976\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"NGC 1976 - Le Blog du N\u00e9oprog\" \/>\n<meta property=\"og:description\" content=\"De 14 \u00e0 20 ans, j’ai pass\u00e9 mes samedis apr\u00e8s-midi dans un club d’astronomie, et mes nuit sous la vo\u00fbte \u00e9toil\u00e9e de la Bretagne. 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