{"id":8582,"date":"2008-01-10T15:55:41","date_gmt":"2008-01-10T15:55:41","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/m42-orion\/"},"modified":"2025-07-14T12:44:28","modified_gmt":"2025-07-14T10:44:28","slug":"m42-orion","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/m42-orion\/","title":{"rendered":"M42 – Orion"},"content":{"rendered":"

Enfin une nuit claire et bien froide ce 7\/1\/2008.
\nJe vous livre la classique n\u00e9buleuse d’Orion… on ne se lasse pas…<\/p>\n

6 images de 4 minutes chacune
\ndarks
\noffsets<\/p>\n

Somme des images apr\u00e8s calibration puis DDP<\/p>\n

Canon 20Da
\nTeleVue NP127 (660 mm de focale)
\nAP Mach1 (avec PEC, non guid\u00e9e)
\nFiltre IDAS LPS<\/p>\n

Si l’erreur p\u00e9riodique est bien ma\u00eetris\u00e9e, l’alignement polaire laisse encore un peu \u00e0 d\u00e9sirer.<\/p>\n

L’absence de flat (en r\u00e9alit\u00e9, ils \u00e9taient surexpos\u00e9s et inutilisables) fait que du vignettage subsistait, qui est bien difficile \u00e0 \u00e9liminer dans ce cas vu la taille de la n\u00e9buleuse, bien centr\u00e9e dans l’image. J’ai utilis\u00e9 ici un flat synth\u00e9tique (gr\u00e2ce \u00e0 Iris).<\/p>\n

Image avec taille r\u00e9duite \u00e0 30%, qualit\u00e9 JPEG 80%:<\/p>\n

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

Image \u00e0 taille originale, qualit\u00e9 JPEG 60%:<\/p>\n

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

Mise \u00e0 jour 15\/1\/2008<\/strong>
\nVoici une nouvelle version, dans laquelle le contraste est am\u00e9lior\u00e9 et le coeur est moins \u00ab\u00a0br\u00fbl\u00e9\u00a0\u00bb; le truc a \u00e9t\u00e9 de se servir pour le coeur d’images prises avec un temps de pose r\u00e9duit (120 et 60 s).<\/p>\n

Image avec taille r\u00e9duite \u00e0 30%, qualit\u00e9 JPEG 80%:<\/p>\n

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

Image \u00e0 taille originale, qualit\u00e9 JPEG 60%:<\/p>\n

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

Mise \u00e0 jour 22\/1\/2008<\/strong>
\nDidier a remarqu\u00e9 que le traitement pr\u00e9c\u00e9dent laissait subsister du vignettage. En effet, pour une partie des images, les flats n’avaient pas \u00e9t\u00e9 correctement appliqu\u00e9s. Voici une version revue et corrig\u00e9e.<\/p>\n

Image avec taille r\u00e9duite \u00e0 30%, qualit\u00e9 JPEG 80%:<\/p>\n

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

Image \u00e0 taille originale, qualit\u00e9 JPEG 60%:
\n\"\"<\/a><\/p>\n\n\n

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

Enfin une nuit claire et bien froide ce 7\/1\/2008. Je vous livre la classique n\u00e9buleuse d’Orion… on ne se lasse pas… 6 images de 4 minutes chacune darks offsets Somme des images apr\u00e8s calibration puis DDP Canon 20Da TeleVue NP127 (660 mm de focale) AP Mach1 (avec PEC, non guid\u00e9e) Filtre IDAS LPS Si l’erreur […]<\/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-8582","post","type-post","status-publish","format-standard","hentry","category-astrophotos"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/8582","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=8582"}],"version-history":[{"count":3,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/8582\/revisions"}],"predecessor-version":[{"id":16178,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/8582\/revisions\/16178"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=8582"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=8582"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=8582"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}