土卫二十八又称为（S/2000 S 10, Erriapus），是环绕土星运行的一颗卫星。

这颗卫星半长轴约为17,236,900公里，绕土星公转周期844.89天，与黄道及土星赤道的轨道倾角为38.109°，轨道离心率0.4724。

Erriapus (/ˌɛriˈæpəs/ ERR-ee-AP-əs; Latin: Erriapus, Erriappus), also Saturn XXVIII (28), is a prograde irregular satellite of Saturn. It was discovered by Brett Gladman, John J. Kavelaars and colleagues in 2000, and given the temporary designation S/2000 S 10. It was named Erriapo in August 2003 after Erriapus, a giant in Gaulish mythology; the name was changed from dative Erriapo to nominative Erriapus per IAU conventions in late 2007.