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1338 Duponta : ウィキペディア英語版 | 1338 Duponta
1338 Duponta (1934 XA) is a main-belt asteroid discovered on December 4, 1934, by Boyer, L. at Algiers. Since the albedo of this asteroid is unknown, the size can only be estimated as between about 8 km - 19 km,〔 based on the absolute magnitude (H) of 12.3.〔 ==Binary system== Photometric observations in 2007 revealed a ~3 km satellite (diameter ratio of 0.23) with an orbital period of 17.57 hours. Due to the similar size of the primary and secondary the Minor Planet Center lists this as a binary companion.〔(【引用サイトリンク】publisher=IAU / Central Bureau for Astronomical Telegrams )〕
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