Herschel is the largest crater relative to its parent body of any equilibrium planetary moon in the Solar System .
It is named after the eighteenth century astronomer William Herschel , who discovered Mimas in 1789 .
William Herschel is the largest crater relative to its parent body of any equilibrium planetary moon in the Solar System .
It is named after the eighteenth century astronomer William Herschel , who discovered Mimas in 1789 .