{"id":2742,"date":"2026-05-28T19:23:08","date_gmt":"2026-05-28T17:23:08","guid":{"rendered":"http:\/\/localhost\/messier\/m28"},"modified":"2026-06-04T14:26:53","modified_gmt":"2026-06-04T12:26:53","slug":"m28-2","status":"publish","type":"messier_object","link":"https:\/\/voyage-astrophoto.fr\/index.php\/messier\/m28-2\/","title":{"rendered":"M28 &#8211; Amas Globulaire M28"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">M28 fut d\u00e9couvert par Charles Messier le 3 mai 1764. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cet amas globulaire est situ\u00e9 \u00e0 environ 18 300 ann\u00e9es-lumi\u00e8re de la Terre, relativement proche du centre galactique dans la direction du Sagittaire. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Il contient environ 90 000 \u00e9toiles sur un diam\u00e8tre d&rsquo;environ 60 ann\u00e9es-lumi\u00e8re et est classifi\u00e9 comme un amas de classe IV (concentration interm\u00e9diaire). <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">M28 est remarquable pour abriter 11 \u00e9toiles variables catalogu\u00e9es, dont la plupart sont des \u00e9toiles variables RR Lyrae, utilis\u00e9es comme chandelles standards pour d\u00e9terminer les distances astronomiques. L&rsquo;amas contient \u00e9galement des \u00e9toiles dot\u00e9es d&rsquo;un exc\u00e8s de sodium, sugg\u00e9rant des processus de m\u00e9lange profonds pendant leur \u00e9volution. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Il est observable avec des t\u00e9lescopes d&rsquo;ouverture mod\u00e9r\u00e9e dans des sites exempts de pollution lumineuse. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Sources: SEDS Messier Database, Wikipedia, NASA.<\/em><\/p>\n","protected":false},"featured_media":0,"template":"","meta":[],"class_list":["post-2742","messier_object","type-messier_object","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/voyage-astrophoto.fr\/index.php\/wp-json\/wp\/v2\/messier_object\/2742","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/voyage-astrophoto.fr\/index.php\/wp-json\/wp\/v2\/messier_object"}],"about":[{"href":"https:\/\/voyage-astrophoto.fr\/index.php\/wp-json\/wp\/v2\/types\/messier_object"}],"wp:attachment":[{"href":"https:\/\/voyage-astrophoto.fr\/index.php\/wp-json\/wp\/v2\/media?parent=2742"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}