{"id":10171,"date":"2020-07-27T15:17:10","date_gmt":"2020-07-27T15:17:10","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/comete-neowise-dans-le-ciel-du-bw\/"},"modified":"2025-06-23T19:24:11","modified_gmt":"2025-06-23T17:24:11","slug":"comete-neowise-dans-le-ciel-du-bw","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/comete-neowise-dans-le-ciel-du-bw\/","title":{"rendered":"Com\u00e8te Neowise dans le ciel du BW"},"content":{"rendered":"

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

Bonjour,<\/p>\n

voici une tentative de mise en \u00e9vidence de la queue ionis\u00e9e de la com\u00e8te Neowise.
\nLes images ont \u00e9t\u00e9 prises dans la nuit du 20 au 21\/07, depuis Rixensart dans le BW.
\nMalgr\u00e9 plus d’une heure de pose au total, pas moyen d’\u00e9liminer compl\u00e8tement les tra\u00een\u00e9es des \u00e9toiles \u00e0 l’int\u00e9gration en raison du bruit et du gradient r\u00e9siduel dans les images individuelles. Il faut dire que depuis le sud du BW, le ciel est particuli\u00e8rement \u00ab\u00a0cram\u00e9\u00a0\u00bb vers le nord…
\nJ’ai fini par faire un filtrage dans l’espace des fr\u00e9quences (Fourier) qui permet de cibler des motifs dans une image. J’ai \u00e9galement d\u00fb \u00eatre un peu agressif sur le filtrage direct du bruit, mais bon, c’\u00e9tait \u00e7a ou rien.
\nLe champ de vue est de 15.5\u00b0x20.2\u00b0.<\/p>\n

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

109 x 40s @ 400Iso; 50mm \u00e0 f\/5.6(Canon 700D)
\nMonture LXD55, sans guidage.
\nTraitement PI et Affinity Photo<\/p>\n

A bient\u00f4t,
\nSimon-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, voici une tentative de mise en \u00e9vidence de la queue ionis\u00e9e de la com\u00e8te Neowise. Les images ont \u00e9t\u00e9 prises dans la nuit du 20 au 21\/07, depuis Rixensart dans le BW. Malgr\u00e9 plus d’une heure de pose au total, pas moyen d’\u00e9liminer compl\u00e8tement les tra\u00een\u00e9es des \u00e9toiles \u00e0 l’int\u00e9gration en […]<\/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-10171","post","type-post","status-publish","format-standard","hentry","category-astrophotos"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10171","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=10171"}],"version-history":[{"count":2,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10171\/revisions"}],"predecessor-version":[{"id":15624,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10171\/revisions\/15624"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=10171"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=10171"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=10171"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}