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Aigle Aquila, Aquilae, Aql

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Aigle Aquila, Aquilae, Aql Club Astronomie des Moulins Aigle Aquila, Aquilae, Aql La constellation de l'Aigle se situe, à peu près sur l'équateur céleste, à la frontière de la Voie lactée. Facilement reconnaissable par ses étoiles assez brillantes, elle fut répertoriée par Ptolémée dès le IIe siècle. Elle est le plus visible les soirs d'août et de septembre. L'étoile la plus brillante de cette constellation est « Altaïr », la douzième étoile la plus brillante du ciel nocturne. Cette étoile fait partie des trois étoiles repères du ciel d'été dans l'hémisphère Nord, le « Triangle de l'été » (Véga de la Lyre, Deneb du Cygne et Altaïr de l'Aigle) Histoire Vraisemblablement identifié à un oiseau dès le XIIe siècle avant l'ère chrétienne, elle représentait pour les Grecs, l'aigle de Zeus. Eudoxe de Cnide (IVe siècle av. J.-C.) et Aratos de Soles (IIIe siècle av. J.-C.) en ont fait mention. Visible depuis les latitudes du bassin méditerranéen, elle a été répertorié par Ptolémée dans sont Almageste. Mythologie Dans la mythologie Hindoue, les trois étoiles les plus évidentes de la constellation, soit Altaïr, Alshain et Tarazed représentaient le pied de Vishnou. Dans l'antiquité européenne, les étoiles de la partie sud de l'Aigle étaient nommées « Ganymède », du nom de l'échanson des dieux grecs qui aurait été enlevé, justement, par l'aigle de Zeus. Dans l'histoire chinoise de Qi Qiao Jie, Niu Lang (Altaïr) et ses deux enfants (Alshain et Tarazed) sont séparés de leur mère Zhi Nu (Véga) qui est située de l'autre côté de la Voie lactée. - 1 - Club Astronomie des Moulins LES ÉTOILES Alpha Aql « Altaïr » Bêta Aql « Alshain » Étoile dans l'Aigle de type spectral : A7IV-V Étoile dans l'Aigle de type spectral : G8IVvar Ascension droite : 19h50'47,01" Ascension droite : 19h55'18,80" Déclinaison : +08°52'6,0" Déclinaison : +06°24'24,4" Magnitude : 0,760 Magnitude : 3,710 Distance : 16,774 années-lumière Distance : 44,717 années-lumière Gamma Aql « Tarazed » Delta Aql Étoile dans l'Aigle de type spectral : K3II Étoile dans l'Aigle de type spectral : FOIV Ascension droite : 19h46'15,59" Ascension droite : 19h25'29,91" Déclinaison : +10°36'47,8" Déclinaison : +03°6,58,9" Magnitude : 2,72 Magnitude : 3,36 Distance : 460,68 années-lumière Distance : 50,140 années-lumière Eta Aql Thêta Aql Étoile variable dans l'Aigle de type spectral : F6Ibv SB Étoile dans l'Aigle de type spectral : B9,5III Ascension droite : 19h52'28,38" Ascension droite : 20h11'18,29" Déclinaison : +01°00'25,6" Déclinaison : -00°49'17,3" Magnitude : 3,48 max. 4,39 min. Magnitude : 3,24 Distance : 1173,2 années-lumière Distance : 287,12 années-lumière Iota Aql Lambda Aql Étoile dans l'Aigle de type spectral : B5III Étoile dans l'Aigle de type spectral : B9Bn Ascension droite : 19h36'43,29" Ascension droite : 19h6'14,95" Déclinaison : -01°17'11,8" Déclinaison : -04°52'57,2" Magnitude : 4,360 Magnitude : 3,430 Distance : 307,41 années-lumière Distance : 125,21 années-lumière Zêta Aql Epsilon Aql Étoile dans l'Aigle de type spectral : AOVn Étoile dans l'Aigle de type spectral : K2III Ascension droite : 19h5'24,6" Ascension droite : 18h59'35,05" Déclinaison : +13°51'48,6" Déclinaison : +15°4'11,9" Magnitude : 2,990 Magnitude : 4,020 Distance :83,247 années-lumière Distance : 153,71 années-lumière - 2 - Club Astronomie des Moulins OBJETS CÉLESTES NGC 6755 – Un amas ouvert NGC 6756 – Un amas ouvert d'une centaine d'étoiles avec concentré. De magnitude un petit télescope. Distant de 10,6, il est situé à 4 900 5 000 années-lumière. années-lumières. ——————————— ——————————— A. D. : 19h07’8” A. D. : 19h07’8” Déclinaison : +04°14’ Déclinaison : +04°14’ Magnitude : 7,5 Magnitude : 10,6 Diamètre : 15’ Diamètre : 4’ NGC 6760 – Un amas NGC 6781 – Une nébuleuse globulaire dont la distance est planétaire de forme arrondi estimée à 70 000 années- distante de 2 600 année- lumière. lumière. ——————————— ——————————— A. D. : 19h11’2” A, D. : 19h18’4” Déclinaison : +01°02’ Déclinaison : +06°33’ Magnitude : 9,1 Magnitude : 12 p Diamètre : 6,6’ Diamètre : 1,8’ NGC 6709 – Un amas ouvert NGC 6738 – Un amas ouvert d'une quarantaine d'étoiles, (modeste). distant de nous de 3000 années-lumière. ——————————— A. D. : 19h04’1” ——————————— Déclinaison : +11°36’ A. D. : 15h51’5” Magnitude : 8,3 Déclinaison : +10°21’ Diamètre : 15’ Magnitude : 6,7 Diamètre : 13’ NGC 6741 – Une nébuleuse NGC 6751 – Une nébuleuse planétaire , l'é- toile centrale planétaire situé à 6 500 est de magnitude 16. années-lumière de nous., son diamètre est moins d'une ——————————— année-lumière. A. D. : 19h02’6” Déclinaison : -00°27’ ——————————— Magnitude : 10,8 A. D. : 19h07’8” Diamètre : 0,1 Déclinaison : +04°14’ Magnitude : 10,6 Diamètre : 4’ - 3 - Club Astronomie des Moulins NGC 6790 – Une nébuleuse NGC 6803 – Une nébuleuse planétaire dont l'étoile centrale planétaire distante de 5 200 est de magnitude 10,5. année-lumière. ——————————— ——————————— A. D. : 19h23’2” A. D. : 19h31’3” Déclinaison : +01°31’ Déclinaison : +10°03’ Magnitude : 10,2 Magnitude : 11 p Diamètre : 0,1’ Diamètre : 0,1’ NGC 6804 – Une petite nébuleuse planétaire de magnitude 11,3. L'étoile centrale des de magnitude 14. ——————————— A. D. : 19h31’6” Déclinaison : +09°13’ Magnitude : 11,3 Diamètre : 1,1’ Source : Imago Mundi – Wikipedia Constellation – Catalogue NGC interactif en ligne — Coelix Photos : Catalogue digital Sky survey – Nasa Cartes : logiciel Coelix avec adaptation sur Corel Draw Mise en ligne : GA - 4 -.
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