{"id":10113,"date":"2020-02-01T22:18:54","date_gmt":"2020-02-01T22:18:54","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/la-boucle-de-barnard-ii\/"},"modified":"2025-06-08T22:44:57","modified_gmt":"2025-06-08T20:44:57","slug":"la-boucle-de-barnard-ii","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/la-boucle-de-barnard-ii\/","title":{"rendered":"La boucle de Barnard (II)"},"content":{"rendered":"

La boucle de Barnard fait partie du complexe d’Orion.
\nIl s’agit d’un nuage mol\u00e9culaire g\u00e9ant qui se pr\u00e9sente en forme d’arc de cercle, approximativement centr\u00e9 sur la grande n\u00e9buleuse d’Orion. <\/p>\n

La boucle de Barnard est accessible depuis nos r\u00e9gions, mais c’est un objet t\u00e9nu qui n\u00e9cessite de longues poses.
\nC’\u00e9tait aussi une de mes premi\u00e8res cibles lors mon s\u00e9jour \u00e0 Oukaimenden en 2018, voulant profiter d’un ciel de qualit\u00e9 et, sous une latitude plus basse, d’une altitude plus \u00e9lev\u00e9e de l’objet.<\/p>\n

L’image est r\u00e9alis\u00e9e avec un objectif photo mont\u00e9 sur une cam\u00e9ra CCD munie d’une roue \u00e0 filtres. Il s’agit d’un composite en LRGB rehauss\u00e9e par une couche Ha.
\nLes poses individuelles ont \u00e9t\u00e9 faites avec une exposition de 240s pour les images grand champ. Elles ont \u00e9t\u00e9 compl\u00e9t\u00e9es par des images de 30s afin de capturer la grande n\u00e9buleuse d’Orion sans (trop) la saturer.
\nPlus de 17 heures de poses sont assembl\u00e9es ici.<\/p>\n

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

Compl\u00e9ment.
\nVoici la couche Halpa:
\n48x240s + 94x30s<\/p>\n

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

Compl\u00e9ment 2.
\nLa couche Ha + colorisation.<\/p>\n

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

Compl\u00e9ment 3.
\nVoici la premi\u00e8re version du traitement.
\nUne LRGB-Ha.<\/p>\n

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

Alexandre
\n2018-11-06 et nuits suivantes
\nHasselblad 50mm
\nQSI583WSG
\nStarAdventurer<\/p>\n\n\n

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

La boucle de Barnard fait partie du complexe d’Orion. Il s’agit d’un nuage mol\u00e9culaire g\u00e9ant qui se pr\u00e9sente en forme d’arc de cercle, approximativement centr\u00e9 sur la grande n\u00e9buleuse d’Orion. La boucle de Barnard est accessible depuis nos r\u00e9gions, mais c’est un objet t\u00e9nu qui n\u00e9cessite de longues poses. C’\u00e9tait aussi une de mes premi\u00e8res […]<\/p>\n","protected":false},"author":16,"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-10113","post","type-post","status-publish","format-standard","hentry","category-astrophotos"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10113","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\/16"}],"replies":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/comments?post=10113"}],"version-history":[{"count":1,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10113\/revisions"}],"predecessor-version":[{"id":11572,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10113\/revisions\/11572"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=10113"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=10113"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=10113"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}