{"id":17438,"date":"2026-10-06T11:20:37","date_gmt":"2026-10-06T09:20:37","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/?p=17438"},"modified":"2026-10-06T11:20:37","modified_gmt":"2026-10-06T09:20:37","slug":"imagerie-en-cak-double-stack-effet-de-variation-de-temperature-des-filtres","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/imagerie-en-cak-double-stack-effet-de-variation-de-temperature-des-filtres\/","title":{"rendered":"Imagerie en CaK (double stack), effet de variation de temp\u00e9rature des filtres"},"content":{"rendered":"

J’avais dans un premier temps d\u00e9termin\u00e9 la temp\u00e9rature de 2 filtres Cak Alluxa 1A \u00e0 26 \/ 24.7\u00b0C.
\nVoici des essais de variations de temp\u00e9rature.<\/p>\n

Voici des images faites \u00e0 plus basse temp\u00e9rature de ces filtres: 25 \/ 23.7\u00b0C.
\nNous avons un filament bien visible sur la deuxi\u00e8me image.
\nNous sommes toujours sur la bande CaK.<\/p>\n

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Ensuite, la temp\u00e9rature est redescendue \u00e0 23.5 \/ 22.0\u00b0C.
\nNous avons toujours un filament bien visible.<\/p>\n

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L’effet n’\u00e9tant pas imm\u00e9diatement visible, voici des essais (\u00e0 plus haute temp\u00e9rature ici) sous forme d’animations \u00e0 23,5 -> 27.0\u00b0C \/ 22,0 -> 25.5\u00b0C pour chaque filtre respectivement. Vers 27\u00b0C, le filament semble disparaitre.<\/p>\n

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La visibilit\u00e9 du filament semble affect\u00e9e par la qualit\u00e9 des images, du seeing plus particuli\u00e8rement.
\nVoici une s\u00e9rie d’images sous forme d’animation \u00e0 25.0 \/ 23.5\u00b0:<\/p>\n

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Et \u00e0 26.5 \/ 25.0\u00b0C. A ces temp\u00e9ratures, le filament semble plus dissip\u00e9.<\/p>\n

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 <\/p>\n

Pour la beaut\u00e9, voici un d\u00e9veloppement de protub\u00e9rance et quelques mini flares.
\nPas de traitement de contraste, les images sortent \u00ab\u00a0telles quelles\u00a0\u00bb du syst\u00e8me (apr\u00e8s alignement et sharpening).<\/p>\n

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Toujours dans la m\u00eame lign\u00e9e d’essais, voici pour des variations cycliques:
\nDe 20,5 \u00e0 23.0 puis retour \u00e0 21.0\u00b0C (Pour le deuxi\u00e8me filtre: 20,0 \u00e0 22.0 puis retour \u00e0 19.5\u00b0C).
\nPour l’animation de filaments, j’ai augment\u00e9 la cadence afin de mettre en \u00e9vidence une impression d’une structure tr\u00e8s dynamique.<\/p>\n

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 <\/p>\n

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 <\/p>\n

Alexandre
\n1, 9, 11 et 12 mai 2025
\nR\u00e9fracteur D~100mm
\nT\u00e9l\u00e9centrique x5
\nCaK 1A double stack
\nASI174MM<\/p>\n\n\n

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\n 10\/10 - (2 votes) <\/div>\n <\/div>\n","protected":false},"excerpt":{"rendered":"

J’avais dans un premier temps d\u00e9termin\u00e9 la temp\u00e9rature de 2 filtres Cak Alluxa 1A \u00e0 26 \/ 24.7\u00b0C. Voici des essais de variations de temp\u00e9rature. Voici des images faites \u00e0 plus basse temp\u00e9rature de ces filtres: 25 \/ 23.7\u00b0C. Nous avons un filament bien visible sur la deuxi\u00e8me image. Nous sommes toujours sur la bande […]<\/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-17438","post","type-post","status-publish","format-standard","hentry","category-astrophotos"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/17438","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=17438"}],"version-history":[{"count":2,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/17438\/revisions"}],"predecessor-version":[{"id":17451,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/17438\/revisions\/17451"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=17438"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=17438"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=17438"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}