{"id":10307,"date":"2022-03-13T16:27:39","date_gmt":"2022-03-13T16:27:39","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/ic1795-fishhead-nebula\/"},"modified":"2025-06-08T22:44:24","modified_gmt":"2025-06-08T20:44:24","slug":"ic1795-fishhead-nebula","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/ic1795-fishhead-nebula\/","title":{"rendered":"IC1795 – \u00ab\u00a0Fishhead nebula\u00a0\u00bb"},"content":{"rendered":"

IC1795 – \u00ab\u00a0Fishhead nebula\u00a0\u00bb<\/p>\n

La \u00ab\u00a0T\u00eate de Poisson\u00a0\u00bb – OK, je suis en avance pour le 1er avril…<\/p>\n

C’est une n\u00e9buleuse en \u00e9mission situ\u00e9e \u00e0 environ 6000 ann\u00e9es-lumi\u00e8re dans la constellation de Cassiop\u00e9e.
\nElle couvre un champ d’environ 20 minutes d’arc, ce qui correspond approximativement \u00e0 70 AL.<\/p>\n

Voici une repr\u00e9sentation en fausses couleurs (palette de Hubble : rouge = Soufre Sii, vert = Hydrog\u00e8ne Ha, bleu = Oxyg\u00e8ne Oiii)
\nR\u00e9sultat de la combinaison d’images prises entre le 13\/1 et le 10\/3, soit :
\nHa : 139 images de 4′
\nOiii : 104 images de 4′
\nSii : 123 images de 4′
\ndonc environ 24 heures de pose au total.<\/p>\n

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

Puis voici une repr\u00e9sentation en palette HOO (rouge = Hydrog\u00e8ne Ha, vert et bleu = Oxyg\u00e8ne Oiii). Avec les m\u00eames donn\u00e9es Ha et Oiii.
\nCette image est plus proche de celles qu’on obtiendrait avec des filtres classiques RGB (mais avec des temps de pose bien plus \u00e9lev\u00e9s encore).<\/p>\n

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

Lunette TeleVue NP127 \u00e0 F5.2 (diam\u00e8tre 127 mm, longueur focale 660 mm)
\nMonture AP Mach1
\nCam\u00e9ra ZWO ASI1600MMPro (monochrome, pixels de 3.8 microns)
\nFiltres Astronomik 12 nm<\/p>\n

Chaque pixel fait 1.19 arcseconde.<\/p>\n

Traitement dans PixInsight.
\nSortie en JPEG qualit\u00e9 75 % et r\u00e9duction au 1\/3 de la taille originale dans PhotoShop.<\/p>\n\n\n

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\n Veuillez voter<\/span>\n <\/div>\n <\/div>\n","protected":false},"excerpt":{"rendered":"

IC1795 – \u00ab\u00a0Fishhead nebula\u00a0\u00bb La \u00ab\u00a0T\u00eate de Poisson\u00a0\u00bb – OK, je suis en avance pour le 1er avril… C’est une n\u00e9buleuse en \u00e9mission situ\u00e9e \u00e0 environ 6000 ann\u00e9es-lumi\u00e8re dans la constellation de Cassiop\u00e9e. Elle couvre un champ d’environ 20 minutes d’arc, ce qui correspond approximativement \u00e0 70 AL. Voici une repr\u00e9sentation en fausses couleurs (palette […]<\/p>\n","protected":false},"author":15,"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-10307","post","type-post","status-publish","format-standard","hentry","category-astrophotos"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10307","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\/15"}],"replies":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/comments?post=10307"}],"version-history":[{"count":1,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10307\/revisions"}],"predecessor-version":[{"id":11381,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10307\/revisions\/11381"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=10307"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=10307"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=10307"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}