{"id":8557,"date":"2007-11-25T19:35:08","date_gmt":"2007-11-25T19:35:08","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/helix-nebula-ngc7293-dans-le-verseau\/"},"modified":"2025-06-14T12:58:46","modified_gmt":"2025-06-14T10:58:46","slug":"helix-nebula-ngc7293-dans-le-verseau","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/helix-nebula-ngc7293-dans-le-verseau\/","title":{"rendered":"Helix Nebula (ngc7293) dans le Verseau"},"content":{"rendered":"

Auteur: Olivier Schreurs (astroliver@gmail.com)<\/p>\n

La n\u00e9buleuse plan\u00e9taire la plus proche (400AL) est plut\u00f4t boud\u00e9e chez nous. Elle ne culmine qu’\u00e0 20\u00b0 et sa brillance surfacique est faible. Sa taille apparente est d’une douzaine de minutes d’arc.
\nLe 13 octobre dernier par une nuit de tr\u00e8s bonne transparence (cf. derni\u00e8res images d’Alain) elle \u00e9tait observable au T255\/f6,6 de Nandrin (SAL) avec le filtre UHC visuel viss\u00e9 \u00e0 l’oculaire.
\nCela m’a encourag\u00e9 \u00e0 la photographier malgr\u00e9 la pr\u00e9sence de lampadaires \u00e0 proximit\u00e9: un peu de leur lumi\u00e8re directe p\u00e9n\u00e9trait dans le tube fortement inclin\u00e9 !
\nVoici la somme de 19 poses de 4 minutes au foyer.
\n350D modifi\u00e9 (filtre IR cut Baader) r\u00e9gl\u00e9 \u00e0 400iso et muni d’un filtre UHC.
\nAutoguidage en RA avec Sbig STV, un peu difficile du fait de la turbulence \u00e9lev\u00e9e \u00e0 cette faible hauteur.
\nPr\u00e9traitement par retrait de darks et d’offsets, pas de flats. L\u00e9ger DDP. Soft IRIS.
\nImage r\u00e9duite en taille pour masquer au maximum le bruit r\u00e9siduel et les d\u00e9fauts de suivi.<\/p>\n

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

Image un peu plus grande avec une balance des couleurs tirant plus vers le rouge:
\n\"\"<\/a><\/p>\n

Oli S<\/p>\n\n\n

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

Auteur: Olivier Schreurs (astroliver@gmail.com) La n\u00e9buleuse plan\u00e9taire la plus proche (400AL) est plut\u00f4t boud\u00e9e chez nous. Elle ne culmine qu’\u00e0 20\u00b0 et sa brillance surfacique est faible. Sa taille apparente est d’une douzaine de minutes d’arc. Le 13 octobre dernier par une nuit de tr\u00e8s bonne transparence (cf. derni\u00e8res images d’Alain) elle \u00e9tait observable au […]<\/p>\n","protected":false},"author":7,"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-8557","post","type-post","status-publish","format-standard","hentry","category-astrophotos"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/8557","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\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/comments?post=8557"}],"version-history":[{"count":3,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/8557\/revisions"}],"predecessor-version":[{"id":14848,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/8557\/revisions\/14848"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=8557"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=8557"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=8557"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}