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Home > Art, Film & Photography > Asteroide: Designation Des Asteroides, Dawn, Echelle de Turin, Exploitation Miniere Des Asteroides, Classification Spectrale Des Asteroides, Systeme Asteroidal
Asteroide: Designation Des Asteroides, Dawn, Echelle de Turin, Exploitation Miniere Des Asteroides, Classification Spectrale Des Asteroides, Systeme Asteroidal

Asteroide: Designation Des Asteroides, Dawn, Echelle de Turin, Exploitation Miniere Des Asteroides, Classification Spectrale Des Asteroides, Systeme Asteroidal


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About the Book

Ce contenu est une compilation d'articles de l'encyclopedie libre Wikipedia. Pages: 23. Non illustre. Chapitres: Designation des asteroides, Dawn, Echelle de Turin, Exploitation miniere des asteroides, Classification spectrale des asteroides, Systeme asteroidal, Colonisation des asteroides, Spaceguard, Lacune de Kirkwood, Strategies de deviation des asteroides, Trou de serrure gravitationnel, (5020) Asimov, Fondation B612, Asteroide cometaire, Asteroide de type D. Extrait: Dawn ( aube en anglais) est une sonde spatiale de la NASA dont la mission consiste a explorer la ceinture d'asteroides entre 2011 a 2015. Apres avoir echappee de peu a une annulation en 2006, Dawn est lancee le 27 septembre 2007. La sonde s'est mise en orbite autour de Vesta le 16 juillet 2011. Elle devrait la quitter en juillet 2012 pour aller se mettre en orbite autour Ceres qu'elle atteindra en fevrier 2015. Ceres et Vesta sont deux plus grands corps de la ceinture d'asteroides. Il est prevu que la mission s'acheve en juillet 2015. Les deux objets qui doivent etre explores par Dawn sont des temoins des debuts de la formation du systeme solaire. La sonde, a l'aide de ses trois instruments scientifiques, doit photographier et cartographier Ceres et Vesta, analyser leur champ de gravite et effectuer des mesures spectrales de l'abondance et la distribution des roches de surface ainsi que des elements chimiques significatifs. Les donnees recueillies permettront d'affiner les theories relatives au processus de formation des planetes. Pour parvenir jusqu'a la ceinture d'asteroides, Dawn a realise deux orbites en decrivant une spirale autour du Soleil tout en faisant fonctionner durant 70% du temps sa propulsion ionique, caracterisee par une poussee tres faible. Elle a egalement recours en fevrier 2009 a l'assistance gravitationnelle de la planete Mars. Sur le plan technique Dawn, qui pese environ dont 425 kg d'ergols, ...


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Product Details
  • ISBN-13: 9781159389710
  • Publisher: Books LLC, Wiki Series
  • Publisher Imprint: Books LLC, Wiki Series
  • Height: 246 mm
  • No of Pages: 24
  • Spine Width: 1 mm
  • Weight: 64 gr
  • ISBN-10: 1159389713
  • Publisher Date: 12 Oct 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Sub Title: Designation Des Asteroides, Dawn, Echelle de Turin, Exploitation Miniere Des Asteroides, Classification Spectrale Des Asteroides, Systeme Asteroidal
  • Width: 189 mm


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