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74503 Madola (1999 DN4) is a main-belt asteroid discovered on February 23, 1999, by Denis Bergeron at Val-des-Bois(Quebec). In mid-2009, it was officially named Madola by the International Astronomical Union, in honor of Christian Marois (b. 1974), René Doyon (b. 1963) and David Lafrenière (b. 1978), who developed instruments and techniques that allowed the first direct photograph of an extrasolar planetary system, consisting of three planets orbiting the star HR 8799 in Pegasus. Doyon was director of the Mont-Mégantic Observatory in Quebec; Marois and Lafrenière were postdoctoral fellows at the Herzberg Institute of Astrophysics and the University of Toronto. ==External links== * http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=madola;orb=0;cov=0;log=0;cad=0 * http://www.astrosurf.com/d_bergeron/astronomie/Bibliotheque/Decouvertes_asteroides/decouvertes_asteroides.htm (in French) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「74503 Madola」の詳細全文を読む スポンサード リンク
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