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__NOTOC__ 944 Hidalgo ( ) is a small Solar System body with a semi-major axis beyond Jupiter's and an orbital period of 13.77 years. This makes it a centaur, the first to be discovered, but it was discovered in 1920 and has hence traditionally been called an asteroid. Hidalgo is estimated to be 38 km in diameter.〔 == Discovery and subsequent studies == 944 Hidalgo was discovered by Walter Baade on October 31, 1920 at Bergedorf Observatory near Hamburg, Germany. It is named for Miguel Hidalgo y Costilla, who was responsible for declaring Mexico's independence in 1810 and the ensuing Mexican War of Independence. German astronomers who were in Mexico to observe a total eclipse on September 10, 1923, had an audience with President Álvaro Obregón. During this meeting, they asked his permission to name the asteroid after Hidalgo.〔Schmadel Lutz D. ''Dictionary of Minor Planet Names'' (fifth edition), Springer, 2003. ISBN 3-540-00238-3.〕 It was one of five minor planets included in the 1993 study, Transition Comets—UV Search for OH Emissions in Asteroids, which was research involving amateur astronomers who were permitted to make use of the Hubble Space Telescope. In the late 1990s, a network of astronomers worldwide gathered light curve data that was ultimately used to derive the spin states and shape models of 10 new asteroids, including 944 Hidalgo. The authors describe the shape model as having 'very large flat areas and a "rectangular" pole-on silhouette, which are strong indications of a highly nonconvex shape'. Some of the light curves show sharp minima, which indicates the object shape may have two lobes.〔〔Durech, J.; Kaasalainen, M.; Marciniak, A.; Allen, W. H. et al. “Asteroid brightness and geometry,” ''Astronomy and Astrophysics'', Volume 465, Issue 1, April I 2007, pp. 331-337.〕 Lightcurve data has also been recorded by observers at the Antelope Hills Observatory, which has been designated as an official observatory by the Minor Planet Center.〔http://www.antelopehillsobservatory.org/Lightcurves/944.gif〕 When Pluto was discovered Hidalgo was the furthest known minor planet from the Sun.〔 (characteristic:a>5.7)〕 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「944 Hidalgo」の詳細全文を読む スポンサード リンク
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