William Lassell (18 yunyu 1799 - 5 tuber 1880) yella d amsenzu seg 1814 alammid 1821 deg Liverpool. Sin akin yuɣal d amesnallun, ilul deg Bolton, yeɣra deg Rothschild seld mi yemmut bab-as. Imahilen Deg 1846, Lassell isnarem-d ayyur n Triton igan d ayyur ameqran yakk n Niptun seld n 17 n wyssat seg mi i d-isnarem umesnallun analman Johann Gottfried Galle amtiweg n Niptun, Akken i yettekka deg usnirem n wayyur n Hyperion yettaṭṭafen amtiweg n yebter deg 1848. Ma deg useggas n 1851 isnarem-d Ariel d Umbriel itezzin ɣef Uṛanus. == Ẓeṛ daɣen ==