{"id":3597,"date":"2021-06-28T19:34:28","date_gmt":"2021-06-28T17:34:28","guid":{"rendered":"http:\/\/robinfo.oma.be\/?p=3597"},"modified":"2025-02-24T16:46:39","modified_gmt":"2025-02-24T15:46:39","slug":"juillet-2021-dans-le-ciel-de","status":"publish","type":"post","link":"https:\/\/robinfo.oma.be\/fr\/juillet-2021-dans-le-ciel-de\/","title":{"rendered":"Juillet 2021 (Dans le ciel de)"},"content":{"rendered":"

AVIS IMPORTANT\u00a0: Pour obtenir l\u2019heure officielle, ajouter DEUX heures aux heures indiqu\u00e9es ci-dessous (en Temps Universel UT pour Uccle)<\/i><\/span><\/span><\/p>\n

Ph\u00e9nom\u00e8nes c\u00e9lestes int\u00e9ressants<\/h3>\n

1 Dernier Quartier<\/b><\/span><\/span><\/span> de Lune \u00e0 21 h 11 m<\/span><\/span><\/span><\/p>\n

4<\/b><\/span><\/span><\/span> Mercure (+0,5)<\/span><\/span><\/span> <\/b>en plus grande \u00e9longation occidentale (22\u00b0W) \u00e0 20 h<\/span><\/span><\/span><\/p>\n

5<\/b><\/span><\/span><\/span> La Lune \u00e0 l\u2019apog\u00e9e <\/span><\/span><\/span>(\u00e0 405 342 km de la Terre \u2013 Diam\u00e8tre apparent\u00a0: 29\u201930\u2019\u2019) <\/span><\/span><\/span>\u00e0 15 h<\/span><\/span><\/span><\/p>\n

La Terre \u00e0 l\u2019<\/span><\/span><\/span>aph\u00e9lie<\/i><\/span><\/span><\/span> \u2013 au plus loin du Soleil \u2013 ou le Soleil \u00e0 l\u2019<\/span><\/span><\/span>apog\u00e9e \u2013 <\/i><\/span><\/span><\/span>au plus loin de la Terre –<\/span><\/span><\/span> <\/i>\u00e0 1,016729 unit\u00e9 astronomique (ua) soit 152\u00a0100 494 kilom\u00e8tres \u00e0 22 h<\/span><\/span><\/span><\/p>\n

8<\/b><\/span><\/span><\/span> La Lune \u00e0 4\u00b0 au nord de Mercure (-1,2) \u00e0 5 h<\/span><\/span><\/span><\/p>\n

9<\/b><\/span><\/span><\/span> Tr\u00e8s mince croissant de Lune \u00e0 rechercher au-dessus de l\u2019horizon nord-est peu apr\u00e8s 3 h, 22 heures avant l\u2019instant de la Nouvelle Lune <\/span><\/span><\/span>(Difficile \u00e0 observer m\u00eame \u00e0 l\u2019aide de jumelles \u2013 Fraction illumin\u00e9e\u00a0: \u00e0 peine 1 %\u00a0!)<\/i><\/span><\/span><\/span><\/p>\n

Les quatre principaux satellites de Jupiter (-2,7) d\u2019un m\u00eame c\u00f4t\u00e9 \u2013 est \u2013 de la plan\u00e8te au soir<\/span><\/span><\/span><\/p>\n

10<\/b><\/span><\/span><\/span>\u00a0<\/span><\/span><\/span>Nouvelle Lune<\/b><\/span><\/span><\/span> \u00e0 1 h 17 m<\/span><\/span><\/span><\/p>\n

13<\/b><\/span><\/span><\/span> Mars \u00e0 l\u2019aph\u00e9lie \u2013 au plus loin du Soleil \u2013 \u00e0 une distance de 1,66596 ua soit 249,224 millions de kilom\u00e8tres<\/span><\/span><\/span><\/p>\n

17<\/b><\/span><\/span><\/span> La petite plan\u00e8te (6) Hebe (+8,6) en opposition avec le Soleil \u2013 d\u00e8s lors visible pendant toute la dur\u00e9e de la nuit \u2013 dans la partie sud de la constellation de l\u2019Aigle<\/span><\/span><\/span><\/p>\n

Premier Quartier<\/b><\/span><\/span><\/span> de Lune \u00e0 10 h 11 m<\/span><\/span><\/span><\/p>\n

La plan\u00e8te naine (134340) Pluton (+14,6) en opposition avec le Soleil \u00e0 23 h<\/span><\/span><\/span><\/p>\n

18<\/b><\/span><\/span><\/span> La petite plan\u00e8te (2) Pallas (+9,6) stationnaire dans la constellation des Poissons \u00e0 20 h<\/span><\/span><\/span><\/p>\n

19<\/b><\/span><\/span><\/span> Disparition de l\u2019\u00e9toile 45 <\/span><\/span><\/span>\u03bb <\/span><\/span><\/span>Lib (+5,0) au bord sombre de la Lune \u00e0 22 h 34,6 m<\/span><\/span><\/span><\/p>\n

Jusqu\u2019\u00e0 23 h 24,7 m, instant de la disparition pour cause d\u2019un d\u00e9but d\u2019\u00e9clipse du satellite J\u00a0II (Europa), les quatre principaux satellites de Jupiter (-2,7) visibles du m\u00eame c\u00f4t\u00e9 \u2013 ouest \u2013 de la plan\u00e8te<\/span><\/span><\/span><\/p>\n

21 <\/b><\/span><\/span><\/span>La Lune au p\u00e9rig\u00e9e <\/span><\/span><\/span>(\u00e0 364 520 km de la Terre \u2013 Diam\u00e8tre apparent\u00a0: 32\u201946\u2019\u2019) <\/span><\/span><\/span>\u00e0 10 h<\/span><\/span><\/span><\/p>\n

22 <\/b><\/span><\/span><\/span>L<\/span><\/span><\/span>e <\/span><\/span><\/span>Soleil<\/b><\/span><\/span><\/span> entre dans le <\/span><\/span><\/span>signe<\/i><\/span><\/span><\/span> du Lion \u00e0 14 h 26 m alors qu\u2019il est pass\u00e9 de la <\/span><\/span><\/span>constellation<\/i><\/span><\/span><\/span> des G\u00e9meaux dans laquelle il se trouvait depuis le 21 juin dans la <\/span><\/span><\/span>constellation<\/i><\/span><\/span><\/span> du Cancer le 21 juillet<\/span><\/span><\/span><\/p>\n

24 Pleine Lune <\/b><\/span><\/span><\/span>\u00e0 2 h 37 m<\/span><\/span><\/span><\/p>\n

26 <\/b><\/span><\/span><\/span>La Lune \u00e0 4\u00b0 au sud de Jupiter (-2,8) \u00e0 1 h<\/span><\/span><\/span><\/p>\n

30<\/b><\/span><\/span><\/span> La petite plan\u00e8te (12) Victoria (+8,8) en opposition avec le Soleil dans la constellation de l\u2019Aigle <\/span><\/span><\/span>(visible au-dessus de l\u2019horizon entre le sud-est et le sud)<\/i><\/span><\/span><\/span><\/p>\n

31 Dernier Quartier<\/b><\/span><\/span><\/span> de Lune \u00e0 13 h 16 m<\/span><\/span><\/span><\/p>\n

Visibilit\u00e9 des plan\u00e8tes<\/h3>\n

Visibles \u00e0 l\u2019\u0153il nu\u00a0: <\/b><\/span><\/span><\/span>Jupiter, Saturne<\/span><\/span><\/span><\/p>\n

Difficiles \u00e0 observer\u00a0: <\/b><\/span><\/span><\/span>Mercure,<\/span><\/span><\/span> <\/b>V\u00e9nus,<\/span><\/span><\/span> <\/b>Uranus, Neptune<\/span><\/span><\/span><\/p>\n

Inobservable\u00a0: <\/b><\/span><\/span><\/span>Mars<\/span><\/span><\/span><\/p>\n

Mercure <\/b><\/span><\/span><\/span>(+1,0\/-1,9), peu de chance de pouvoir \u00eatre observ\u00e9e le matin pendant \u00e0 peine quelques jours en d\u00e9but de mois malgr\u00e9 son passage en plus grande \u00e9longation le 4, se l\u00e8ve le 1 \u00e0 2 h 33\u00a0m, le 15 \u00e0 2 h 25 m et le 31 \u00e0 3 h 53 m <\/span><\/span><\/span><\/p>\n

V\u00e9nus<\/b><\/span><\/span><\/span> (-3,9\/-3,9), encore difficile \u00e0 observer le soir <\/span><\/span><\/span>(voir mois pr\u00e9c\u00e9dents)<\/i><\/span><\/span><\/span> au coucher bas au-dessus de l\u2019horizon ouest d\u2019abord dans la constellation du Cancer et, \u00e0 partir du 12 environ, dans la constellation du Lion, se couche le 1 \u00e0 21 h 29 m, le 15 \u00e0 21\u00a0h 12\u00a0m et le 31 \u00e0 20\u00a0h 44 \u00a0m <\/span><\/span><\/span>(heures auxquelles il convient d\u2019ajouter la valeur de la dur\u00e9e du cr\u00e9puscule civil, \u00e0 savoir 46 min \u2013 en d\u00e9but de mois \u2013 et 40 min en fin de mois) <\/i><\/span><\/span><\/span>soit respectivement 1 h 30\u00a0m, 1 h 22 m et 1 h 15 m <\/span><\/span><\/span> <\/i>apr\u00e8s le Soleil <\/span><\/span><\/span><\/p>\n

Mars <\/b><\/span><\/span><\/span>(+1,8<\/span><\/span><\/span>\/+1,8) passe au m\u00e9ridien le 1 \u00e0 14 h 04 m, le 15 \u00e0 13 h 43 m et le 31 \u00e0 13\u00a0h 19\u00a0m, d\u00e8s lors pratiquement non observable <\/span><\/span><\/span><\/p>\n

Jupiter <\/b><\/span><\/span><\/span>(-2,7\/-2,8), une grande partie de la nuit au-dessus de l\u2019horizon pendant tout le mois et m\u00eame d\u00e8s durant le cr\u00e9puscule du soir \u00e0 partir du milieu du mois, dans la constellation du Verseau, se l\u00e8ve le 1 \u00e0 22 h 14 m, le 15 \u00e0 21\u00a0h 18 m et le 31 \u00e0 20\u00a0h 12\u00a0m <\/span><\/span><\/span><\/p>\n

<\/a> Saturne<\/b><\/span><\/span><\/span> (+0,4\/+0,2), une grande partie de la nuit au-dessus de l\u2019horizon pendant tout le mois et m\u00eame d\u00e8s durant le cr\u00e9puscule du soir \u00e0 partir du milieu du mois, dans la constellation du Capricorne, se l\u00e8ve le 1 \u00e0 21 h 30 m, le 15 \u00e0 20 h 34\u00a0m et le 31 \u00e0 19\u00a0h 28 m <\/span><\/span><\/span><\/p>\n

Uranus <\/b><\/span><\/span><\/span>(+5,8\/+5,8), une grande partie de la nuit au-dessus de l\u2019horizon est-sud-est dans la constellation du B\u00e9lier, se l\u00e8ve le 1 \u00e0 0 h 27 m, le 15 \u00e0 23 h 32 m et le 31 \u00e0 22\u00a0h 28\u00a0m <\/span><\/span><\/span><\/p>\n

Neptune <\/b><\/span><\/span><\/span>(+7,9\/+7,8), une grande partie de la nuit au-dessus de l\u2019horizon sud-est dans la constellation du Verseau, se l\u00e8ve le 1 \u00e0 22 h 54 m, le 15 \u00e0 21 h 59 m et le 31 \u00e0 20\u00a0h 55 m <\/span><\/span><\/span><\/p>\n

Pour en savoir plus :<\/i><\/span><\/span><\/span><\/p>\n

Annuaire 2021 de l\u2019Observatoire Royal de Belgique<\/a> ORB <\/span><\/span><\/span>(En vente \u00e0 l\u2019Observatoire : EUR 13,00)<\/i><\/span><\/span><\/span><\/p>\n

Eph\u00e9m\u00e9rides du mois dans la revue <\/span><\/span><\/span>Ciel et Terre<\/i><\/span><\/span><\/span> de la Soci\u00e9t\u00e9 Royale belge d\u2019Astronomie, de M\u00e9t\u00e9orologie et de Physique du Globe SRBA <\/span><\/span><\/span>(www.srba.be<\/a>)<\/i><\/span><\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

AVIS IMPORTANT\u00a0: Pour obtenir l\u2019heure officielle, ajouter DEUX heures aux heures indiqu\u00e9es ci-dessous (en Temps Universel UT pour Uccle) Ph\u00e9nom\u00e8nes c\u00e9lestes int\u00e9ressants 1 Dernier Quartier de Lune \u00e0 21 h 11 m 4 Mercure (+0,5) en plus grande \u00e9longation occidentale (22\u00b0W) \u00e0 20 h 5 La Lune \u00e0 l\u2019apog\u00e9e (\u00e0 405 342 km de la […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[51],"tags":[],"featured_image_src":{"landsacpe":false,"list":false,"medium":false,"full":false},"_links":{"self":[{"href":"https:\/\/robinfo.oma.be\/fr\/wp-json\/wp\/v2\/posts\/3597"}],"collection":[{"href":"https:\/\/robinfo.oma.be\/fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/robinfo.oma.be\/fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/robinfo.oma.be\/fr\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/robinfo.oma.be\/fr\/wp-json\/wp\/v2\/comments?post=3597"}],"version-history":[{"count":1,"href":"https:\/\/robinfo.oma.be\/fr\/wp-json\/wp\/v2\/posts\/3597\/revisions"}],"predecessor-version":[{"id":3598,"href":"https:\/\/robinfo.oma.be\/fr\/wp-json\/wp\/v2\/posts\/3597\/revisions\/3598"}],"wp:attachment":[{"href":"https:\/\/robinfo.oma.be\/fr\/wp-json\/wp\/v2\/media?parent=3597"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/robinfo.oma.be\/fr\/wp-json\/wp\/v2\/categories?post=3597"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/robinfo.oma.be\/fr\/wp-json\/wp\/v2\/tags?post=3597"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}