{"id":4151,"date":"2023-12-07T13:19:51","date_gmt":"2023-12-07T12:19:51","guid":{"rendered":"https:\/\/robinfo.oma.be\/?p=4151"},"modified":"2025-02-24T16:48:07","modified_gmt":"2025-02-24T15:48:07","slug":"decembre-2023-dans-le-ciel-de","status":"publish","type":"post","link":"https:\/\/robinfo.oma.be\/fr\/decembre-2023-dans-le-ciel-de\/","title":{"rendered":"D\u00e9cembre 2023 (Dans le ciel de)"},"content":{"rendered":"

AVIS IMPORTANT : Pour obtenir l\u2019heure officielle, ajouter UNE heure 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 <\/b><\/span><\/span><\/span>D\u00e9but de l\u2019hiver <\/span><\/span><\/span>m\u00e9t\u00e9orologique 2023 <\/i><\/span><\/span><\/span>et de l\u2019ann\u00e9e <\/span><\/span><\/span>climatologique<\/i><\/span><\/span><\/span> 2024<\/span><\/span><\/span><\/p>\n

2<\/b><\/span><\/span><\/span> La Lune \u00e0 4\u00b0 N de l\u2019amas stellaire ouvert M44 (<\/span><\/span><\/span>Praesepe<\/i><\/span><\/span><\/span> ou encore <\/span><\/span><\/span>Beehive<\/i><\/span><\/span><\/span> = <\/span><\/span><\/span>NGC2632<\/i><\/span><\/span><\/span>) dans la constellation du Cancer<\/span><\/span><\/span><\/p>\n

4<\/b><\/span><\/span><\/span> Mercure (-0,4) en plus grande \u00e9longation orientale (21\u00b0 E) \u00e0 14 h<\/span><\/span><\/span><\/p>\n

La Lune \u00e0 l\u2019apog\u00e9e (\u00e0 404\u00a0348 km de la Terre \u2013 Diam\u00e8tre apparent\u00a0: 29\u2019 36\u201d) \u00e0 19 h<\/span><\/span><\/span><\/p>\n

5 Dernier Quartier <\/b><\/span><\/span><\/span>de Lune \u00e0 5 h 49 m<\/span><\/span><\/span><\/p>\n

7<\/b><\/span><\/span><\/span> Neptune stationnaire \u00e0 0 h<\/span><\/span><\/span><\/p>\n

R\u00e9apparition au bord sombre de la Lune de l\u2019\u00e9toile<\/span><\/span><\/span> <\/b>15<\/span><\/span><\/span> <\/b>\u03b7 Vir (Zanich) (+3,9) \u00e0 1 h 46,5 m (h = + 6\u00b0\u00a0!)<\/span><\/span><\/span><\/p>\n

9 <\/b><\/span><\/span><\/span>La Lune 4\u00b0 S de V\u00e9nus (-4,2) dans le voisinage de l\u2019\u00e9toile Spica [Alpha Vir (+9,2)] au-dessus de l\u2019horizon SE \u00e0 6 h<\/span><\/span><\/span><\/p>\n

10 <\/b><\/span><\/span><\/span>Mince croissant de Lune au-dessous de V\u00e9nus (-4,2) au-dessus de l\u2019horizon sud-est vers 6 h<\/span><\/span><\/span><\/p>\n

12<\/b><\/span><\/span><\/span> Plus pr\u00e9coce coucher du Soleil (15 h 37 m) en 2023<\/span><\/span><\/span><\/p>\n

Nouvelle Lune<\/b><\/span><\/span><\/span> \u00e0 23 h 32 m<\/span><\/span><\/span><\/p>\n

13<\/b><\/span><\/span><\/span> Mercure stationnaire \u00e0 5 h<\/span><\/span><\/span><\/p>\n

Du <\/span><\/span><\/span>4<\/b><\/span><\/span><\/span> au <\/span><\/span><\/span>20<\/b><\/span><\/span><\/span> d\u00e9cembre, p\u00e9riode optimale pour l\u2019observation en seconde partie de nuit de l\u2019essaim de m\u00e9t\u00e9ores des <\/span><\/span><\/span>G\u00e9minides <\/b><\/span><\/span><\/span>(<\/span><\/span><\/span>\u00e9toiles filantes<\/i><\/span><\/span><\/span>) \u2013 dans des conditions tr\u00e8s favorables propices \u00e0 un \u00e9ventuel d\u00e9placement vers des r\u00e9gions de ciel plus noirs et mieux d\u00e9gag\u00e9s pour l\u2019observation en cas de conditions m\u00e9t\u00e9orologiques cl\u00e9mentes \u2013 avec un maximum th\u00e9orique d\u2019activit\u00e9 pr\u00e9vu approximativement le <\/span><\/span><\/span>14<\/b><\/span><\/span><\/span> d\u00e9cembre vers 19 h (<\/span><\/span><\/span>Fraction illumin\u00e9e de Lune\u00a0: 0,05 – Taux horaire z\u00e9nithal THZ = 150<\/i><\/span><\/span><\/span>)<\/span><\/span><\/span><\/p>\n

14<\/b><\/span><\/span><\/span> La Lune \u00e0 4\u00b0 S de Mercure (+0,6) \u00e0 5 h<\/span><\/span><\/span><\/p>\n

16 <\/b><\/span><\/span><\/span>La Lune au p\u00e9rig\u00e9e (\u00e0 367\u00a0900 km de la Terre \u2013 Diam\u00e8tre apparent\u00a0: 32\u2019 28\u201d) \u00e0 19 h<\/span><\/span><\/span><\/p>\n

17 <\/b><\/span><\/span><\/span>Le plan\u00e9to\u00efde (704) Interamnia (+10,3) en opposition avec le Soleil par 30\u00b0 de d\u00e9clinaison dans une int\u00e9ressante r\u00e9gion riche en \u00e9toiles de la constellation du Cocher (Aur) <\/span><\/span><\/span><\/p>\n

La Lune \u00e0 2\u00b0 S de Saturne (+0,9) au-dessus de l\u2019horizon sud-ouest vers 20 h<\/span><\/span><\/span><\/p>\n

19 Premier Quartier<\/b><\/span><\/span><\/span> de Lune \u00e0 18 h 39 m<\/span><\/span><\/span><\/p>\n

20<\/b><\/span><\/span><\/span> Mercure<\/b><\/span><\/span><\/span> au p\u00e9rih\u00e9lie<\/span><\/span><\/span><\/p>\n

21<\/b><\/span><\/span><\/span> La Lune et Jupiter<\/b><\/span><\/span><\/span> (-2,7) \u00e0 10\u00b0 l\u2019une de l\u2019autre au-dessus de l\u2019horizon sud-est d\u00e8s la fin du cr\u00e9puscule civil vers 17 h<\/span><\/span><\/span><\/p>\n

La petite plan\u00e8te (4) Vesta (+6,7) en opposition avec le Soleil dans la partie nord de la constellation d\u2019Orion \u00e0 la limite de la constellation des G\u00e9meaux \u00e0 19 h<\/span><\/span><\/span><\/p>\n

22 <\/b><\/span><\/span><\/span>S<\/i><\/span><\/span><\/span>olstice d\u2019hiver\u00a0<\/i><\/span><\/span><\/span>: le centre du disque solaire atteint la longitude 270\u00b000\u201900\u2019\u2019 et sa plus grande d\u00e9clinaison australe (-23\u00b016\u201918\u2019\u2019), par d\u00e9finition le d\u00e9but de l\u2019hiver <\/span><\/span><\/span>astronomique<\/i><\/span><\/span><\/span> \u2013 jours les plus courts dans l\u2019h\u00e9misph\u00e8re bor\u00e9al de la Terre \u2013 \u00e0 03 h 27\u00a0m. A cet instant, le <\/span><\/span><\/span>Soleil<\/b><\/span><\/span><\/span> entre dans le <\/span><\/span><\/span>signe<\/i><\/span><\/span><\/span> du Capricorne alors qu\u2019il est pass\u00e9 de la <\/span><\/span><\/span>constellation<\/i><\/span><\/span><\/span> d\u2019Ophiuchus dans laquelle il se trouvait depuis le 30 novembre dans la <\/span><\/span><\/span>constellation<\/i><\/span><\/span><\/span> du Sagittaire le 18 d\u00e9cembre.<\/span><\/span><\/span><\/p>\n

Mercure en conjonction inf\u00e9rieure avec le Soleil \u00e0 19 h<\/span><\/span><\/span><\/p>\n

Le plan\u00e9to\u00efde (9) Metis (+8,5) en opposition avec le Soleil dans la constellation des G\u00e9meaux<\/span><\/span><\/span><\/p>\n

27 Pleine Lune <\/b><\/span><\/span><\/span>\u00e0 0 h 33 m<\/span><\/span><\/span><\/p>\n

31<\/b><\/span><\/span><\/span> Plus tardif lever de Soleil (7 h 45 m) de l\u2019ann\u00e9e 2023<\/span><\/span><\/span><\/p>\n

Jupiter stationnaire \u00e0 15 h<\/span><\/span><\/span><\/p>\n

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

Visibles \u00e0 l\u2019\u0153il nu\u00a0: <\/b><\/span><\/span><\/span>V\u00e9nus,<\/span><\/span><\/span> <\/b>Jupiter, Saturne<\/span><\/span><\/span><\/p>\n

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

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

Mercure <\/b><\/span><\/span><\/span>(-0,4\/+2,2), dans les tout premiers jours du mois seulement, le soir bas au-dessus de l\u2019horizon sud-ouest dans la constellation du Sagittaire, se couche le 1 \u00e0 16\u00a0h 41 m, le 15 \u00e0 16\u00a0h 36 m et le 31 \u00e0 14 h 49 m soit respectivement 01 h 01 m et 0 h 59 m apr\u00e8s, et 0 h 57 avant le Soleil <\/span><\/span><\/span><\/p>\n

V\u00e9nus<\/b><\/span><\/span><\/span> (-4,2\/-4,1), le matin successivement dans les constellations de la Vierge puis de la Balance, se l\u00e8ve le 1 \u00e0 3 h 17\u00a0m, le 15 \u00e0 3\u00a0h 53\u00a0m et le 31 \u00e0 4\u00a0h 38 m, soir respectivement 4 h 05 m, 3 h 45 m et 3 h 07 m avant le Soleil <\/span><\/span><\/span><\/p>\n

Mars <\/b><\/span><\/span><\/span>(+1,4\/+1,4) passe au m\u00e9ridien le 1 \u00e0 11\u00a0h 14 m, le 15 \u00e0 11 h 02\u00a0m et le 31 \u00e0 10 h 51 m, d\u00e8s lors non observable<\/span><\/span><\/span> <\/i><\/p>\n

Jupiter <\/b><\/span><\/span><\/span>(-2,8\/-2,6), pendant une grande partie de la nuit dans la constellation du B\u00e9lier, passe au m\u00e9ridien le 1 \u00e0 21 h 21 m, le 15 \u00e0 20\u00a0h 23\u00a0m et le 31 \u00e0 19 h 18\u00a0m <\/span><\/span><\/span><\/p>\n

<\/a> Saturne<\/b><\/span><\/span><\/span> (+0,9\/+1,0), pendant une grande partie de la nuit dans la constellation du Verseau, passe au m\u00e9ridien le 1 \u00e0 17\u00a0h 17 m, le 15 \u00e0 16 h 24\u00a0m et le 31 \u00e0 15 h 29\u00a0m <\/span><\/span><\/span><\/p>\n

Uranus <\/b><\/span><\/span><\/span>(+5,6\/+5,7), avant et apr\u00e8s minuit dans la constellation du B\u00e9lier, passe au m\u00e9ridien le 1 \u00e0 22 h 12 m, le 15 \u00e0 21 h 16 m et le 31 \u00e0 20 h 11 m <\/span><\/span><\/span><\/p>\n

Neptune <\/b><\/span><\/span><\/span>(+7,9\/+7,9), avant et apr\u00e8s minuit successivement dans les constellations du Verseau puis des Poissons, passe au m\u00e9ridien le 1 \u00e0 18 h 44\u00a0m, le 15 \u00e0 17 h 48\u00a0m et le 31 \u00e0 16 h 46 m<\/span><\/span><\/span><\/p>\n

Pour en savoir plus :<\/i><\/strong>
\nAnnuaire 2023 de l\u2019Observatoire royal de Belgique<\/a> (En vente \u00e0 l\u2019Observatoire : EUR 13,00)<\/i>
\n\u00c9ph\u00e9m\u00e9rides du mois dans la revue Ciel et Terre<\/i> de la Soci\u00e9t\u00e9 Royale belge d\u2019Astronomie, de M\u00e9t\u00e9orologie et de Physique du Globe SRBA (www.srba.be<\/a>)<\/i><\/p>\n","protected":false},"excerpt":{"rendered":"

AVIS IMPORTANT : Pour obtenir l\u2019heure officielle, ajouter UNE heure aux heures indiqu\u00e9es ci-dessous (en Temps Universel UT pour Uccle) Ph\u00e9nom\u00e8nes c\u00e9lestes int\u00e9ressants 1 D\u00e9but de l\u2019hiver m\u00e9t\u00e9orologique 2023 et de l\u2019ann\u00e9e climatologique 2024 2 La Lune \u00e0 4\u00b0 N de l\u2019amas stellaire ouvert M44 (Praesepe ou encore Beehive = NGC2632) dans la constellation du […]<\/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\/4151"}],"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=4151"}],"version-history":[{"count":1,"href":"https:\/\/robinfo.oma.be\/fr\/wp-json\/wp\/v2\/posts\/4151\/revisions"}],"predecessor-version":[{"id":4152,"href":"https:\/\/robinfo.oma.be\/fr\/wp-json\/wp\/v2\/posts\/4151\/revisions\/4152"}],"wp:attachment":[{"href":"https:\/\/robinfo.oma.be\/fr\/wp-json\/wp\/v2\/media?parent=4151"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/robinfo.oma.be\/fr\/wp-json\/wp\/v2\/categories?post=4151"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/robinfo.oma.be\/fr\/wp-json\/wp\/v2\/tags?post=4151"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}