{"id":30960,"date":"2025-12-29T17:59:20","date_gmt":"2025-12-29T16:59:20","guid":{"rendered":"https:\/\/www.astrobreuillet.fr\/wordpress\/?p=30960"},"modified":"2025-12-29T17:59:20","modified_gmt":"2025-12-29T16:59:20","slug":"m45-lamas-des-pleiades","status":"publish","type":"post","link":"https:\/\/www.astrobreuillet.fr\/wordpress\/?p=30960","title":{"rendered":"M45, L&#8217;Amas des Pl\u00e9iades"},"content":{"rendered":"<p>Views: 63<\/p><p>Cyril NOGER<\/p><p>&nbsp;<\/p>\n<p>L&#8217;amas des Pl\u00e9iades, les Pl\u00e9iades ou amas M45, est un amas ouvert d&#8217;\u00e9toiles qui s&#8217;observe depuis les deux h\u00e9misph\u00e8res, dans la constellation du Taureau.<br \/>\nSa distance, par rapport \u00e0 nous, est estim\u00e9e \u00e0 440 Ann\u00e9es-Lumi\u00e8re.<br \/>\nOn d\u00e9nombre aujourd&#8217;hui dans cet amas environ 3 000 \u00e9toiles, dont une douzaine sont visibles \u00e0 l&#8217;\u0153il nu. Il s&#8217;\u00e9tend sur 2\u00b0, soit l&#8217;\u00e9quivalent de quatre fois le diam\u00e8tre apparent de la Lune. Sa densit\u00e9 est donc relativement faible par rapport aux autres amas ouverts. L&#8217;\u00e2ge de l&#8217;amas est estim\u00e9 \u00e0 100 millions d&#8217;ann\u00e9es, mais il ne devrait pas vivre longtemps puisqu&#8217;il devrait se s\u00e9parer dans 250 millions d&#8217;ann\u00e9es, en partie \u00e0 cause de sa faible densit\u00e9.<br \/>\nLes 9 \u00e9toiles les plus brillantes de l&#8217;amas tirent leurs noms des sept s\u0153urs et de leurs parents Atlas et Pl\u00e9ion\u00e9 (en rapport \u00e0 la Mythologie): Ast\u00e9rope, M\u00e9rope (ou Dryope, ou A\u00e9ro), \u00c9lectre, Ma\u00efa, Tayg\u00e8te, C\u00e9la\u00e9no (ou S\u00e9l\u00e8ne) et Alcyone.<br \/>\nLeur magnitude apparente est comprise entre 2,86 et 5,44, donc accessible \u00e0 l&#8217;\u0153il nu.<br \/>\nCette photo est le r\u00e9sultat de l&#8217;empilement d&#8217;une dur\u00e9e de 3h06 de pose avec des poses individuelles de 30s avec une lunette de 500mm de focale.<br \/>\nLa qualit\u00e9 du ciel n&#8217;\u00e9tait pas optimale, d&#8217;o\u00f9 les halos autour des \u00e9toiles brillantes (probablement dus \u00e0 un l\u00e9ger voile d&#8217;altitude et l&#8217;humidit\u00e9 ambiante).<\/p>\n<p>EXIFs:<br \/>\nSONY A7Sd modifi\u00e9 Astrodon<br \/>\nLunette ASKAR FRA500, F\/5.6<br \/>\nFiltre IDAS LP3 (anti-pollution lumineuse)<br \/>\n29 Darks, 53 Offsets, 30 Flat<br \/>\n372 Images de 30s \u00e0 3200iso<br \/>\nLogiciel utilis\u00e9 : Pixinsight<\/p>\n<p><a href=\"https:\/\/www.astrobreuillet.fr\/wordpress\/wp-content\/uploads\/2025\/12\/Chart-1.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.astrobreuillet.fr\/wordpress\/wp-content\/uploads\/2025\/12\/Chart-1-150x150.jpg\" width=\"150\" height=\"150\" alt=\"Chart-1.jpg\" style=\"display:inline-block\" \/><\/a> <a href=\"https:\/\/www.astrobreuillet.fr\/wordpress\/wp-content\/uploads\/2025\/12\/M45_CAB-0-scaled.jpg\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.astrobreuillet.fr\/wordpress\/wp-content\/uploads\/2025\/12\/M45_CAB-0-150x150.jpg\" width=\"150\" height=\"150\" alt=\"M45_CAB-0.jpg\" style=\"display:inline-block\" \/><\/a> <\/p>","protected":false},"excerpt":{"rendered":"<p>Views: 63Cyril NOGER&nbsp; L&#8217;amas des Pl\u00e9iades, les Pl\u00e9iades ou amas M45, est un amas ouvert d&#8217;\u00e9toiles qui s&#8217;observe depuis les deux h\u00e9misph\u00e8res, dans la constellation du Taureau. Sa distance, par rapport \u00e0 nous, est estim\u00e9e \u00e0 440 Ann\u00e9es-Lumi\u00e8re. On d\u00e9nombre aujourd&#8217;hui dans cet amas environ 3 000 \u00e9toiles, dont une douzaine sont visibles \u00e0 l&#8217;\u0153il [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":30962,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","_s2mail":"","footnotes":""},"categories":[152],"tags":[],"class_list":["post-30960","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-galerie-photo-2025","et-has-post-format-content","et_post_format-et-post-format-standard"],"_links":{"self":[{"href":"https:\/\/www.astrobreuillet.fr\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/30960"}],"collection":[{"href":"https:\/\/www.astrobreuillet.fr\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.astrobreuillet.fr\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.astrobreuillet.fr\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/www.astrobreuillet.fr\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=30960"}],"version-history":[{"count":1,"href":"https:\/\/www.astrobreuillet.fr\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/30960\/revisions"}],"predecessor-version":[{"id":30961,"href":"https:\/\/www.astrobreuillet.fr\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/30960\/revisions\/30961"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.astrobreuillet.fr\/wordpress\/index.php?rest_route=\/wp\/v2\/media\/30962"}],"wp:attachment":[{"href":"https:\/\/www.astrobreuillet.fr\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=30960"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.astrobreuillet.fr\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=30960"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.astrobreuillet.fr\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=30960"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}