{"id":8160,"date":"2006-04-23T02:20:10","date_gmt":"2006-04-23T02:20:10","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/73p-proche-dalphecca-alpha-coronae-borealis\/"},"modified":"2025-06-16T23:03:49","modified_gmt":"2025-06-16T21:03:49","slug":"73p-proche-dalphecca-alpha-coronae-borealis","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/73p-proche-dalphecca-alpha-coronae-borealis\/","title":{"rendered":"73P proche d’Alphecca (alpha Coronae Borealis)"},"content":{"rendered":"

Auteur: Olivier Schreurs (astroliver@gmail.com)<\/p>\n

Imag\u00e9e le 21 avril de 02h10 \u00e0 02h54 avec le Canon Rebel au foyer du T400 de la SAL. Au fil des poses, la brume se dilue mais la transparence restera faible…
\n33 poses d’1min \u00e0 800 iso, filtre N\u00e9odyme obligatoire, guidage sur une \u00e9toile (le noyau est bcp trop faible dans le Maksutov-guide \u00e0 166x de grossissement). La s\u00e9quence dure 44 minutes intervalles compris.
\nPar erreur, le format des images brutes est du jpeg<\/strong> (!) et non du raw: faible dynamique, pas de dark ni d’offset possibles; je me retiens de tout effacer et entame un traitement compliqu\u00e9 pour 2 s\u00e9ries d’alignements, but de l’exercice: sur le noyau puis sur les \u00e9toiles.
\nLa 1\u00e8re photo a l’aspect d’une longue pose classique guid\u00e9e sur la com\u00e8te o\u00f9 la lumi\u00e8re des \u00e9toiles se disperse en traits continus. Le timing<\/em> de la s\u00e9quence est cette fois correct: l’illusion est r\u00e9ussie \ud83d\ude09
\nLa seconde photo, plus facile \u00e0 obtenir montre clairement le mouvement apparent du noyau en 44 min sur fond d’\u00e9toiles fixes mais pas tr\u00e8s ponctuelles: le t\u00e9lescope a besoin d’\u00eatre collimat\u00e9 ! Les raies de lumi\u00e8re proviennent du reflet d’Alphecca situ\u00e9e \u00e0 moins d’un degr\u00e9 de champ. Le FOV des images est de 31′ en longueur.<\/p>\n

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

Auteur: Olivier Schreurs (astroliver@gmail.com) Imag\u00e9e le 21 avril de 02h10 \u00e0 02h54 avec le Canon Rebel au foyer du T400 de la SAL. Au fil des poses, la brume se dilue mais la transparence restera faible… 33 poses d’1min \u00e0 800 iso, filtre N\u00e9odyme obligatoire, guidage sur une \u00e9toile (le noyau est bcp trop faible […]<\/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-8160","post","type-post","status-publish","format-standard","hentry","category-astrophotos"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/8160","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=8160"}],"version-history":[{"count":2,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/8160\/revisions"}],"predecessor-version":[{"id":15104,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/8160\/revisions\/15104"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=8160"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=8160"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=8160"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}