{"id":10319,"date":"2022-04-15T08:47:57","date_gmt":"2022-04-15T08:47:57","guid":{"rendered":"https:\/\/groupeastronomiespa.be\/astrogas\/lamas-globulaire-m3-2\/"},"modified":"2025-06-24T20:27:26","modified_gmt":"2025-06-24T18:27:26","slug":"lamas-globulaire-m3-2","status":"publish","type":"post","link":"https:\/\/groupeastronomiespa.be\/astrogas\/lamas-globulaire-m3-2\/","title":{"rendered":"L\u2019amas globulaire M3"},"content":{"rendered":"

Auteur: Alain Pothen (pothen59@gmail.com)<\/p>\n

M3 est constitu\u00e9 d\u2019environ un demi-million d’\u00e9toiles et se situe \u00e0 33.000 ann\u00e9es lumi\u00e8res de la Terre.
\nIl se serait form\u00e9 il y a 11,4 milliards d\u2019ann\u00e9es ce qui fait de lui un des plus vieux objets de notre Galaxie.
\nL’objet a \u00e9t\u00e9 d\u00e9couvert en 1764 par Charles Messier, c’est le premier objet de son catalogue qu’il a lui-m\u00eame d\u00e9couvert.<\/p>\n

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Cette photo, l\u00e9g\u00e8rement crop\u00e9e et r\u00e9duite \u00e0 50%, fait partie des acquisitions que j\u2019ai faites en mars avec ma lunette 150\/1200 doublet + ASI294MM pro \u00e0 -15 \u00b0C.
\nPar curiosit\u00e9 j\u2019ai voulu tester le mode bin1 de cette cam\u00e9ra\u2026 ? bin1 -> 0,4″\/pixel + filtres RGB 155x300s (12h55)<\/p>\n

C\u2019est lors de ces acquisitions de M3 que j\u2019ai eu des doutes sur la mise au point automatique de mon syst\u00e8me due \u00e0 mon focuser \u00e0 friction. En suivant le d\u00e9roulement des op\u00e9rations d\u2019acquisition, j\u2019ai remarqu\u00e9 que parfois, lors de l\u2019AutoFocus, les points de calibration ne s\u2019inscrivaient pas parfaitement sur une parabole comme habituellement. Lors de la derni\u00e8re nuit, cela est apparu au m\u00e9ridien, apr\u00e8s 2-3 clich\u00e9s j\u2019ai stopp\u00e9 la session, dirig\u00e9 la lunette assez bas sur l\u2019horizon, refait la proc\u00e9dure de mise au point, retourn\u00e9 sur ma cible M3 et recommencer les acquisitions\u2026 qui \u00e9taient visiblement plus nettes, m\u00eame sur mon smartphone. J\u2019ai refait ce test une heure plus tard lors du changement de filtre et m\u00eame r\u00e9sultat, pas flagrant mais visible.
\nFaudra que je r\u00e8gle cela pour les prochaines photos.<\/p>\n

Alain \ud83d\ude42<\/p>\n\n\n

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

Auteur: Alain Pothen (pothen59@gmail.com) M3 est constitu\u00e9 d\u2019environ un demi-million d’\u00e9toiles et se situe \u00e0 33.000 ann\u00e9es lumi\u00e8res de la Terre. Il se serait form\u00e9 il y a 11,4 milliards d\u2019ann\u00e9es ce qui fait de lui un des plus vieux objets de notre Galaxie. L’objet a \u00e9t\u00e9 d\u00e9couvert en 1764 par Charles Messier, c’est le […]<\/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-10319","post","type-post","status-publish","format-standard","hentry","category-astrophotos"],"_links":{"self":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10319","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=10319"}],"version-history":[{"count":2,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10319\/revisions"}],"predecessor-version":[{"id":15689,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/posts\/10319\/revisions\/15689"}],"wp:attachment":[{"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/media?parent=10319"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/categories?post=10319"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/groupeastronomiespa.be\/astrogas\/wp-json\/wp\/v2\/tags?post=10319"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}