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1000 Piazzia : ウィキペディア英語版 | 1000 Piazzia
1000 Piazzia is a main-belt asteroid, discovered in 1923. It was the 1000th minor planet to be numbered, and was named in honour of Giuseppe Piazzi, who discovered the first asteroid, 1 Ceres. Its radius is estimated to be , and measurements of its light curve by Robert D. Stephens in 2001 showed it to be rotating with a period of 9.47 hours. The planet Piazzia comes closest to is Mars. It draws nearer than 1.33 AU eleven times in the 20th and 21st centuries. Rarely, the two are closer than one AU. This last happened in 1638, and won't happen again for another 14,000 years. ==See also==
* The first 1000 minor planets
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「1000 Piazzia」の詳細全文を読む
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