{"id":9508,"date":"2013-10-03T15:02:16","date_gmt":"2013-10-03T15:02:16","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/les-fantomes-de-cassiopee\/"},"modified":"2025-06-08T22:46:33","modified_gmt":"2025-06-08T20:46:33","slug":"les-fantomes-de-cassiopee","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/les-fantomes-de-cassiopee\/","title":{"rendered":"Les fant\u00f4mes de Cassiop\u00e9e"},"content":{"rendered":"

Bonjour,
\nSitu\u00e9es dans la constellation de Cassiop\u00e9e, les n\u00e9buleuses IC 59 (\u00e0 droite) et IC 63 (\u00e0 gauche) sont une combinaison de faibles n\u00e9buleuses \u00e0 \u00e9mission et \u00e0 r\u00e9flexion distantes d\u2019environ 600 ann\u00e9es-lumi\u00e8re de la Terre. elles ont ensemble une taille approximative de 10 ann\u00e9es lumi\u00e8re.
\nCes n\u00e9buleuses se dissipent lentement sous l\u2019influence de l\u2019intense rayonnement ionisant ultraviolet de la chaude \u00e9toile gamma Cass (l\u2019\u00e9toile la plus brillante de l\u2019image). Celle-ci est physiquement situ\u00e9e \u00e0 3 ou 4 ann\u00e9es-lumi\u00e8re des n\u00e9buleuses.
\nL\u00e9g\u00e8rement plus proche de gamma Cass, IC 63 pr\u00e9sente une dominante rouge\u00e2tre correspondant \u00e0 l\u2019\u00e9mission H-alpha qui se produit lorsque les atomes d\u2019hydrog\u00e8ne ionis\u00e9s retrouvent leur \u00e9lectron. Plus \u00e9loign\u00e9e de l\u2019\u00e9toile, IC 59 pr\u00e9sente une luminosit\u00e9 en H-alpha nettement moindre, et une dominante bleut\u00e9e \u00e9vocatrice du reflet de la lumi\u00e8re des \u00e9toiles sur la poussi\u00e8re.
\nLa photo pr\u00e9sent\u00e9e ici \u00e0 50% de sa taille d’acquisition a \u00e9t\u00e9 prise ce mercredi 02\/09\/2013 depuis La Fosse avec l’ APN Canon 350D Baader plac\u00e9 derri\u00e8re la lunette Televue NP 101 IS munie du r\u00e9ducteur 0,8X (D= 101mm F= 430mm). 38 poses de 5 minutes (soit au total 3 hrs 10) \u00e0 400 ISO ont \u00e9t\u00e9 pr\u00e9trait\u00e9es sous IRIS puis pass\u00e9es sous Photoshop (courbes et niveaux) et finalis\u00e9es sous Paint Shop Pro (saturation, luminosit\u00e9 et contraste) pour obtenir ce r\u00e9sultat.<\/p>\n

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

J-Luc<\/p>\n\n\n

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

Bonjour, Situ\u00e9es dans la constellation de Cassiop\u00e9e, les n\u00e9buleuses IC 59 (\u00e0 droite) et IC 63 (\u00e0 gauche) sont une combinaison de faibles n\u00e9buleuses \u00e0 \u00e9mission et \u00e0 r\u00e9flexion distantes d\u2019environ 600 ann\u00e9es-lumi\u00e8re de la Terre. elles ont ensemble une taille approximative de 10 ann\u00e9es lumi\u00e8re. Ces n\u00e9buleuses se dissipent lentement sous l\u2019influence de l\u2019intense […]<\/p>\n","protected":false},"author":14,"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-9508","post","type-post","status-publish","format-standard","hentry","category-astrophotos"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/9508","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\/14"}],"replies":[{"embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/comments?post=9508"}],"version-history":[{"count":1,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/9508\/revisions"}],"predecessor-version":[{"id":12173,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/9508\/revisions\/12173"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=9508"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=9508"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=9508"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}