Helene is the thirteenth of Saturn's known satellites:　　orbit: 377,400 km　　diameter: 33 km (36 x 32 x 30)　　Helene is the name of an Amazon who battled with Achilles.　　Discovered by Laques and Lecacheux in 1980 from ground-based observations.　　Helene is in Dione's leading Lagrange point and hence was sometimes referred to as "Dione B".　　土卫十二是距土星第十三近卫星：　　公转轨道：377,400 千米　　卫星直径：33 千米 (36 x 32 x 30)　　Helene是与Achilles战斗的亚马逊人名。　　它是在1980年被地面天文台的Laques和Lecacheux发现的。　　土卫十二在Dione土卫四的拉格朗日前点上，因此有时它被称为“Dione B”。