{"id":49114,"date":"2023-01-03T16:14:57","date_gmt":"2023-01-03T15:14:57","guid":{"rendered":"https:\/\/www.stelvision.com\/astro\/?page_id=49114"},"modified":"2023-09-08T18:44:57","modified_gmt":"2023-09-08T16:44:57","slug":"conjonction-opposition-planete","status":"publish","type":"page","link":"https:\/\/www.stelvision.com\/astro\/conjonction-opposition-planete\/","title":{"rendered":"Opposition et conjonction, des positions remarquables des plan\u00e8tes"},"content":{"rendered":"\n

Les oppositions et les conjonctions sont des positions particuli\u00e8res des plan\u00e8tes. Quand se produisent-elles ? Quelle cons\u00e9quence pour leur observation ?<\/p>\n\n\n\n

Qu\u2019est-ce qu\u2019une plan\u00e8te en opposition ?<\/h2>\n\n\n\n

L\u2019opposition<\/em> ne concerne que les plan\u00e8tes sup\u00e9rieures : il s\u2019agit de l\u2019instant o\u00f9 se produit l\u2019alignement Soleil-Terre-plan\u00e8te, la plan\u00e8te se trouvant \u00e0 l’oppos\u00e9 du Soleil. La valeur de l’\u00e9longation<\/a> est alors de 180\u00b0.<\/p>\n\n\n

\n
\"\"<\/a>
Principe de l’opposition d’une plan\u00e8te.<\/strong> Illustration : Stelvision\/Carine Souplet<\/small><\/figcaption><\/figure>\n<\/div>\n\n\n

En pratique, l\u2019opposition d\u2019une plan\u00e8te marque le meilleur moment de sa p\u00e9riode d’observation favorable : la plan\u00e8te pr\u00e9sente son plus grand diam\u00e8tre apparent et elle est observable tout au long de la nuit.<\/p>\n\n\n\n

Le saviez-vous ?<\/strong> L\u2019opposition d’une plan\u00e8te est souvent pr\u00e9sent\u00e9e comme le moment o\u00f9 elle se trouve au plus pr\u00e8s de la Terre. Il s\u2019agit en fait d\u2019une approximation, l\u2019instant de la distance minimale se produisant souvent quelques heures ou quelques jours avant ou apr\u00e8s l\u2019alignement parfait. Cette petite diff\u00e9rence s\u2019explique par le fait que les orbites plan\u00e9taires ne sont pas circulaires, mais elliptiques.<\/p>\n\n\n\n

Qu’est-ce qu’une plan\u00e8te en conjonction ?<\/h2>\n\n\n\n

La conjonction<\/em> d’une plan\u00e8te a lieu lorsque qu’elle se trouve exactement dans la m\u00eame direction que le Soleil (soit derri\u00e8re lui, soit devant lui) lorsqu’on la regarde depuis la Terre. La valeur de l’\u00e9longation<\/a> est alors de z\u00e9ro.<\/p>\n\n\n\n

Pour les plan\u00e8tes sup\u00e9rieures<\/strong> (plus \u00e9loign\u00e9es du Soleil que la Terre), c\u2019est toujours l\u2019alignement plan\u00e8te-Soleil-Terre qui se produit.<\/p>\n\n\n

\n
\"\"<\/a>
Principe de la conjonction d’une plan\u00e8te sup\u00e9rieure.<\/strong> Illustration : Stelvision\/Carine Souplet<\/small><\/figcaption><\/figure>\n<\/div>\n\n\n

Pour les plan\u00e8tes inf\u00e9rieures<\/strong> (plus proches du Soleil que la Terre, c\u2019est-\u00e0-dire Mercure et V\u00e9nus), les deux configurations sont possibles. On parle alors de conjonction sup\u00e9rieure<\/em> pour l\u2019alignement plan\u00e8te-Soleil-Terre et de conjonction inf\u00e9rieure<\/em> pour l\u2019alignement Soleil-plan\u00e8te-Terre.<\/p>\n\n\n

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\"\"<\/a>
Principe des deux configurations possibles pour la conjonction d’une plan\u00e8te inf\u00e9rieure.<\/strong> Illustration : Stelvision\/Carine Souplet<\/small><\/figcaption><\/figure>\n<\/div>\n\n\n

En pratique, lorsqu\u2019une plan\u00e8te est en conjonction, elle est inobservable car noy\u00e9e dans les lumi\u00e8res du Soleil.<\/p>\n\n\n\t\t\t\t\t\t

\t\t\t\t\r\n\t\t\t\t\t\"visuel\r\n\t\t\t\t<\/a>\r\n\t\t\t\t

Le Ciel au t\u00e9lescope, le guide indispensable pour r\u00e9ussir vos observations<\/a><\/strong><\/p>\r\n\t\t\t<\/div>\n","protected":false},"excerpt":{"rendered":"

Les oppositions et les conjonctions sont des positions particuli\u00e8res des plan\u00e8tes. Quand se produisent-elles ? Quelle cons\u00e9quence pour leur observation ? Qu\u2019est-ce qu\u2019une plan\u00e8te en opposition ? L\u2019opposition … Opposition et conjonction, des positions remarquables des plan\u00e8tes<\/span><\/a><\/p>\n","protected":false},"author":5,"featured_media":49125,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"footnotes":""},"class_list":["post-49114","page","type-page","status-publish","has-post-thumbnail","hentry"],"acf":[],"yoast_head":"\nOpposition et conjonction, des positions remarquables des plan\u00e8tes<\/title>\n<meta name=\"description\" content=\"Les conjonctions et les oppositions sont des positions particuli\u00e8res des plan\u00e8tes dans le ciel. 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