土衛十五又稱為「亞特剌斯」(S/1980 S 28, Atlas),是環繞土星運行的一顆內衛星。
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這顆衛星半長軸約為137,670公里,繞土星公轉週期0.6016947883天,與黃道及土星赤道的軌道傾角為0.003°~0.004°,軌道離心率0.0012。
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