{"id":2805,"date":"2026-05-28T19:23:08","date_gmt":"2026-05-28T17:23:08","guid":{"rendered":"http:\/\/localhost\/messier\/m91"},"modified":"2026-06-11T12:00:45","modified_gmt":"2026-06-11T10:00:45","slug":"m91-2","status":"publish","type":"messier_object","link":"https:\/\/voyage-astrophoto.fr\/index.php\/messier\/m91-2\/","title":{"rendered":"M91 &#8211; Galaxie spirale M91"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">M91 fut d\u00e9couverte par Pierre M\u00e9chain le 8 mars 1781 et ind\u00e9pendamment par Charles Messier le 18 mars 1781.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L&rsquo;identification de M91 fut longtemps confuse jusqu&rsquo;\u00e0 ce que l&rsquo;on r\u00e9alise qu&rsquo;elle correspondait \u00e0 NGC 4548.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cette galaxie spirale barr\u00e9e (type SBb) est le membre le plus faible des objets Messier de l&rsquo;Amas de la Chevelure de B\u00e9r\u00e9nice. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Elle est situ\u00e9e \u00e0 environ 63 millions d&rsquo;ann\u00e9es-lumi\u00e8re. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">M91 poss\u00e8de une barre pro\u00e9minente et des bras spiraux, caract\u00e9ristiques des galaxies spirales barr\u00e9es. Elle est plus faible que ses voisines M88 et M89, avec une magnitude de 10,2. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La d\u00e9tection de cette galaxie n\u00e9cessite des t\u00e9lescopes d&rsquo;au moins 150 mm d&rsquo;ouverture sous de bonnes conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sources: SEDS Messier Database, Wikipedia, NASA.<\/p>\n","protected":false},"featured_media":0,"template":"","meta":[],"class_list":["post-2805","messier_object","type-messier_object","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/voyage-astrophoto.fr\/index.php\/wp-json\/wp\/v2\/messier_object\/2805","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=2805"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}