{"id":10054,"date":"2019-06-10T17:19:37","date_gmt":"2019-06-10T17:19:37","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/amelioration-du-halo-autour-des-etoiles-brillantes-cas-des-telescopes-a-miroirs-bon-marches\/"},"modified":"2025-06-14T11:10:13","modified_gmt":"2025-06-14T09:10:13","slug":"amelioration-du-halo-autour-des-etoiles-brillantes-cas-des-telescopes-a-miroirs-bon-marches","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/amelioration-du-halo-autour-des-etoiles-brillantes-cas-des-telescopes-a-miroirs-bon-marches\/","title":{"rendered":"Am\u00e9lioration du halo autour des \u00e9toiles brillantes – cas des t\u00e9lescopes \u00e0 miroirs \u00ab\u00a0bon march\u00e9s\u00a0\u00bb"},"content":{"rendered":"

Auteur: simon-pierre (spgorza@mailfence.com)<\/p>\n

Bonjour \u00e0 tous,<\/p>\n

voici une am\u00e9lioration simple et efficace \u00e0 r\u00e9aliser sur un t\u00e9lescope si vous rencontrez des probl\u00e8mes de halo non homog\u00e8ne autour des \u00e9toiles brillantes (en dehors de la diffraction due \u00e0 l\u2019araign\u00e9e bien s\u00fbr). <\/p>\n

Comme certains d\u2019entre vous me l\u2019avaient fait remarquer, les photos prises avec mon Newton Skywatcher 10\u201d F\/4, souffraient assez fort de ce d\u00e9faut. Ci-dessous, un crop autour d\u2019Alcyone dans les Pl\u00e9iades (luminance de 10 minutes + d\u00e9veloppement) illustre bien le probl\u00e8me. <\/p>\n

\n\"\"<\/a><\/div>\n

Il est rapidement apparu que ce d\u00e9faut sur les images est d\u00fb \u00e0 la diffraction sur les irr\u00e9gularit\u00e9s du bord du miroir qui ne sont pas correctement masqu\u00e9es par les baffles du tube, les bandes sombres \u00e9tant dues au masquage du bord par les clips de fixation du primaire. J\u2019ai donc r\u00e9alis\u00e9 et fix\u00e9 un disque, peint \u00e0 la peinture noire mat \u00ab\u00a0effet craie\u00a0\u00bb, pour masquer le bord. Les vis de fixation des clips ont aussi \u00e9t\u00e9 masqu\u00e9es.<\/p>\n

\n\"\"<\/a>
\n\"\"<\/a>\n<\/div>\n

L\u2019image d\u2019Alcyone (luminance 190 minutes + d\u00e9veloppement) montre que cela am\u00e9liore nettement le r\u00e9sultat. J\u2019aurais m\u00eame d\u00fb faire un disque plus large pour masquer compl\u00e8tement les clips. <\/p>\n

\n\"\"<\/a>\n<\/div>\n

A bient\u00f4t,<\/p>\n

Simon-P.<\/p>\n\n\n

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

Auteur: simon-pierre (spgorza@mailfence.com) Bonjour \u00e0 tous, voici une am\u00e9lioration simple et efficace \u00e0 r\u00e9aliser sur un t\u00e9lescope si vous rencontrez des probl\u00e8mes de halo non homog\u00e8ne autour des \u00e9toiles brillantes (en dehors de la diffraction due \u00e0 l\u2019araign\u00e9e bien s\u00fbr). Comme certains d\u2019entre vous me l\u2019avaient fait remarquer, les photos prises avec mon Newton Skywatcher […]<\/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":[3],"tags":[],"class_list":["post-10054","post","type-post","status-publish","format-standard","hentry","category-astrobricolage"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10054","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=10054"}],"version-history":[{"count":2,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10054\/revisions"}],"predecessor-version":[{"id":14796,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10054\/revisions\/14796"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=10054"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=10054"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=10054"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}