{"id":3195,"date":"2021-02-22T19:15:19","date_gmt":"2021-02-22T18:15:19","guid":{"rendered":"http:\/\/robinfo.oma.be\/?p=3195"},"modified":"2021-02-22T19:15:19","modified_gmt":"2021-02-22T18:15:19","slug":"mars-2021-dans-le-ciel-de","status":"publish","type":"post","link":"https:\/\/robinfo.oma.be\/fr\/mars-2021-dans-le-ciel-de\/","title":{"rendered":"Mars 2021 (Dans le ciel de)"},"content":{"rendered":"

AVIS IMPORTANT\u00a0: Pour obtenir l\u2019heure officielle, ajouter UNE heure (DEUX heures \u00e0 partir du 28 mars \u00e0 1 h UT) 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>\u00a0D\u00e9but du printemps <\/span><\/span><\/span>m\u00e9t\u00e9orologique <\/i><\/span><\/span><\/span><\/p>\n

2 <\/b><\/span><\/span><\/span>La Lune au p\u00e9rig\u00e9e (<\/span><\/span><\/span>\u00e0 365 422 km de la Terre \u2013 Diam\u00e8tre apparent\u00a0: 32\u201942\u2019\u2019<\/span><\/span><\/span>) \u00e0 5 h<\/span><\/span><\/span><\/p>\n

3<\/b><\/span><\/span><\/span> Mars (+0,9) \u00e0 3\u00b0 au sud de l\u2019amas stellaire ouvert des Pl\u00e9iades (M45) \u00e0 24 h<\/span><\/span><\/span><\/p>\n

4<\/b><\/span><\/span><\/span> <\/b><\/i>La petite plan\u00e8te (4) Vesta (+6,3) en opposition avec le Soleil dans la constellation du Lion \u00e0 18 h<\/span><\/span><\/span><\/p>\n

5<\/b><\/span><\/span><\/span> R\u00e9apparition de l\u2019\u00e9toile 9 \u03c9<\/span><\/span><\/span>1<\/span><\/span><\/span><\/sup> Sco (+3,9) au bord sombre de la Lune \u00e0 5 h 41,5m<\/span><\/span><\/span><\/p>\n

Jupiter (-2,0) en conjonction \u00e0 0,3\u00b0 au sud de Mercure (+0,2) \u00e0 7 h<\/span><\/span><\/span><\/p>\n

6 Dernier Quartier <\/b><\/span><\/span><\/span> de Lune \u00e0 1 h 30 m<\/span><\/span><\/span><\/p>\n

Mercure (+0,1) en plus grande \u00e9longation occidentale (27,3\u00b0) \u00e0 11 h <\/span><\/span><\/span>(dans des conditions d\u00e9favorables)<\/i><\/span><\/span><\/span><\/p>\n

9 <\/b><\/span><\/span><\/span>La Lune \u00e0 4\u00b0 au sud de Saturne (+0,7) \u00e0 23 h <\/span><\/span><\/span> <\/b><\/p>\n

11 <\/b><\/span><\/span><\/span>Neptune en conjonction avec le Soleil \u2013 d\u00e8s lors non observable \u2013 \u00e0 0 h <\/span><\/span><\/span><\/p>\n

La Lune \u00e0 4\u00b0 au sud de Mercure (+0,1) \u00e0 1 h<\/span><\/span><\/span><\/p>\n

13 Nouvelle Lune<\/b><\/span><\/span><\/span> \u00e0 10 h 21 m<\/span><\/span><\/span><\/p>\n

14 <\/b><\/span><\/span><\/span>Mince croissant de Lune au-dessus de l\u2019horizon ouest vers 18 h 15 m, 32 heures apr\u00e8s l\u2019instant de la Nouvelle Lune <\/span><\/span><\/span>(A rechercher \u00e0 l\u2019aide de jumelles \u2013 A Uccle, coucher du Soleil \u00e0 17 h 46 m et coucher de la Lune \u00e0 18 h 53 m \u2013 Fraction illumin\u00e9e\u00a0: 0,02)<\/i><\/span><\/span><\/span><\/p>\n

18 <\/b><\/span><\/span><\/span>La Lune \u00e0 l\u2019apog\u00e9e (<\/span><\/span><\/span>\u00e0 405 253 km de la Terre \u2013 Diam\u00e8tre apparent\u00a0: 29\u201930\u2019\u2019<\/span><\/span><\/span>) \u00e0 5 h<\/span><\/span><\/span><\/p>\n

19<\/b><\/span><\/span><\/span> La Lune \u00e0 2\u00b0 au sud de Mars (+1,1) vers 18 h et en alignement entre Mars et l\u2019\u00e9toile Ald\u00e9baran [Alpha Tau (+0,9)] vers 19 h <\/span><\/span><\/span>[A observer au-dessus de l\u2019horizon sud-ouest ou ouest les 18, 19 et 20 mars peu avant 19 h, parmi de nombreuses \u00e9toiles de la constellation du Taureau dont plus particuli\u00e8rement l\u2019amas stellaire ouvert des Pl\u00e9iades (M45)]<\/i><\/span><\/span><\/span><\/p>\n

20 <\/b><\/span><\/span><\/span>Equinoxe<\/i><\/span><\/span><\/span> de printemps\u00a0: <\/i><\/span><\/span><\/span>le centre du disque du Soleil traverse du sud au nord le plan de l\u2019\u00e9quateur : longitude \u00e9cliptique 0\u00b000\u201900\u2019\u2019 \u2013 par d\u00e9finition, le commencement du printemps <\/span><\/span><\/span>astronomique<\/i><\/span><\/span><\/span> \u2013 \u00e0 9 h 37 m. L<\/span><\/span><\/span>e <\/span><\/span><\/span>Soleil<\/b><\/span><\/span><\/span> entre \u00e0 cet instant dans le <\/span><\/span><\/span>signe<\/i><\/span><\/span><\/span> du B\u00e9lier alors qu\u2019il est pass\u00e9 de la <\/span><\/span><\/span>constellation<\/i><\/span><\/span><\/span> du Verseau dans laquelle il se trouvait depuis le 16 f\u00e9vrier dans la <\/span><\/span><\/span>constellation<\/i><\/span><\/span><\/span> des Poissons le 12 mars.<\/span><\/span><\/span><\/p>\n

Mars (+1,2) \u00e0 7\u00b0 au nord de l\u2019\u00e9toile Ald\u00e9baran [Alpha Tau (+0,9)] vers 19 h<\/span><\/span><\/span><\/p>\n

21<\/b><\/span><\/span><\/span> Premier Quartier <\/b><\/span><\/span><\/span>de Lune \u00e0 14 h 40 m<\/span><\/span><\/span><\/p>\n

La petite plan\u00e8te 231937 (2001 FO 32) du type Apollo, d\u2019un diam\u00e8tre de l\u2019ordre de 1 km et d\u2019une magnitude de 11,5 au moment de son passage au plus pr\u00e8s de la Terre \u00e0 0,013 unit\u00e9 astronomique (ua) soit 1,945 millions de kilom\u00e8tres ou 5 fois la distance Terre-Lune, vers 16 h<\/span><\/span><\/span><\/p>\n

23<\/b><\/span><\/span><\/span> Mars (+1,2) \u00e0 7\u00b0 au nord de <\/span><\/span><\/span>l\u2019\u00e9toile Ald\u00e9baran [Alpha Tau (+0,9)] \u00e0 0 h<\/span><\/span><\/span><\/p>\n

26<\/b><\/span><\/span><\/span> La Lune \u00e0 5\u00b0 au nord de l\u2019\u00e9toile R\u00e9gulus [Alpha Leo (+1,3)] \u00e0 1 h<\/span><\/span><\/span><\/p>\n

V\u00e9nus en conjonction sup\u00e9rieure avec le Soleil \u00e0 7 h <\/span><\/span><\/span>(d\u00e8s lors inobservable – dans des conditions favorables – pendant plusieurs mois) <\/i><\/span><\/span><\/span><\/p>\n

27<\/b><\/span><\/span><\/span> Disparition de l\u2019\u00e9toile 3 \u03bd Vir (+4,0) au bord sombre de la Lune \u00e0 18 h 31,3 m <\/span><\/span><\/span>(pendant le cr\u00e9puscule civil\u00a0!) <\/i><\/span><\/span><\/span><\/p>\n

28<\/b><\/span><\/span><\/span> Pleine Lune <\/b><\/span><\/span><\/span>\u00e0 18 h 48 m<\/span><\/span><\/span><\/p>\n

30 <\/b><\/span><\/span><\/span>La Lune au p\u00e9rig\u00e9e (<\/span><\/span><\/span>\u00e0 360 311 km de la Terre \u2013 Diam\u00e8tre apparent\u00a0: 33\u201910\u2019\u2019<\/span><\/span><\/span>) \u00e0 6 h<\/span><\/span><\/span><\/p>\n

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

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

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

Inobservables\u00a0: <\/b><\/span><\/span><\/span>V\u00e9nus,<\/span><\/span><\/span> <\/b>Neptune <\/span><\/span><\/span><\/p>\n

Mercure <\/b><\/span><\/span><\/span>(+0,3\/-0,4), dans le ciel du matin mais – \u00e0 nos latitudes \u2013 si basse au-dessus de l\u2019horizon sud-est que l\u2019on ne peut esp\u00e9rer la retrouver m\u00eame lors de sa plus grande \u00e9longation occidentale le 6, se l\u00e8ve le 1 \u00e0 5\u00a0h 31 m, le 15 \u00e0 5\u00a0h 21\u00a0m et le 31 \u00e0 5 h 06 m soit respectivement \u00e0 peine 0 h 56 m, 0 h 35\u00a0m et 0 h 15 m avant le Soleil, d\u00e8s lors pratiquement non observable (\u00e0 l\u2019\u0153il nu) <\/span><\/span><\/span><\/p>\n

V\u00e9nus<\/b><\/span><\/span><\/span> (-3,9\/-3,9), en conjonction sup\u00e9rieure avec le Soleil le 26, passe au m\u00e9ridien le 1 \u00e0 11\u00a0h 33 m, le 15 \u00e0 11\u00a0h 44\u00a0m et le 31 \u00e0 11 h 53 m, d\u00e8s lors non observable <\/span><\/span><\/span><\/p>\n

Mars <\/b><\/span><\/span><\/span>(+0,9\/+1,3), avant et apr\u00e8s minuit dans la constellation du Taureau et au voisinage de l\u2019amas stellaire ouvert des Pl\u00e9iades en d\u00e9but de mois (jusqu\u2019au 8), se couche le 1 \u00e0 0\u00a0h 47 m, le 15 \u00e0 0 h 37\u00a0m et le 31 \u00e0 0 h 24\u00a0m <\/span><\/span><\/span><\/p>\n

<\/a> Jupiter <\/b><\/span><\/span><\/span>(-2,0\/-2,0), le matin au-dessus de l\u2019horizon sud-est dans la constellation du Capricorne \u00e0 une dizaine de degr\u00e9s seulement (\u00e0 l\u2019est) de Saturne moins brillante pendant une bonne partie de l\u2019ann\u00e9e, se l\u00e8ve le 1 \u00e0 5 h 43\u00a0m, le 15 \u00e0 4 h 55\u00a0m et le 31 \u00e0 4 h 00 m <\/span><\/span><\/span><\/p>\n

Saturne<\/b><\/span><\/span><\/span> (+0,7\/+0,8), le matin au-dessus de l\u2019horizon sud-est dans la constellation du Capricorne \u00e0 une dizaine de degr\u00e9s seulement (\u00e0 l\u2019ouest) de Jupiter, se l\u00e8ve le 1 \u00e0 5\u00a0h 23\u00a0m, le 15 \u00e0 4 h 31 m et le 31 \u00e0 3\u00a0h 32 m <\/span><\/span><\/span><\/p>\n

Uranus <\/b><\/span><\/span><\/span>(+5,8\/+5,9), le soir au-dessus de l\u2019horizon sud-ouest dans la constellation du B\u00e9lier, se couche le 1 \u00e0 22 h 38\u00a0m, le 15 \u00e0 21 h 46 m et le 31 \u00e0 20 h 48 m <\/span><\/span><\/span><\/p>\n

Neptune <\/b><\/span><\/span><\/span>(+8,0\/+8,0), en conjonction avec le Soleil le 11 dans la constellation du Verseau, passe au m\u00e9ridien le 1 \u00e0 12 h 31\u00a0m, le 15 \u00e0 11 h 38 m et le 31 \u00e0 10 h 37\u00a0m, d\u00e8s lors non observable <\/span><\/span><\/span><\/p>\n

Pour ceux qui veulent en savoir plus\u00a0:<\/i><\/span><\/span><\/span><\/p>\n

Annuaire 2021 de l\u2019Observatoire Royal de Belgique<\/a> ORB <\/span><\/span><\/span>(En vente \u00e0 l\u2019Observatoire\u00a0: 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)<\/i><\/span><\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

AVIS IMPORTANT\u00a0: Pour obtenir l\u2019heure officielle, ajouter UNE heure (DEUX heures \u00e0 partir du 28 mars \u00e0 1 h UT) aux heures indiqu\u00e9es ci-dessous (en Temps Universel UT pour Uccle) Ph\u00e9nom\u00e8nes c\u00e9lestes int\u00e9ressants 1\u00a0D\u00e9but du printemps m\u00e9t\u00e9orologique 2 La Lune au p\u00e9rig\u00e9e (\u00e0 365 422 km de la Terre \u2013 Diam\u00e8tre apparent\u00a0: 32\u201942\u2019\u2019) \u00e0 5 […]<\/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\/3195"}],"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=3195"}],"version-history":[{"count":1,"href":"https:\/\/robinfo.oma.be\/fr\/wp-json\/wp\/v2\/posts\/3195\/revisions"}],"predecessor-version":[{"id":3196,"href":"https:\/\/robinfo.oma.be\/fr\/wp-json\/wp\/v2\/posts\/3195\/revisions\/3196"}],"wp:attachment":[{"href":"https:\/\/robinfo.oma.be\/fr\/wp-json\/wp\/v2\/media?parent=3195"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/robinfo.oma.be\/fr\/wp-json\/wp\/v2\/categories?post=3195"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/robinfo.oma.be\/fr\/wp-json\/wp\/v2\/tags?post=3195"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}