Arthur (crater)Arthur is a crater on Mimas, a moon of Saturn. The crater was named after the King Arthur, the eponymous king of Arthurian Legend. The name "Arthur" was officially approved by the International Astronomical Union in 1982.Geology and characteristicsArthur is located at Mimas's Trailing hemisphere, with the coordinates of ; and has a diameter of approximately across the surface of Mimas. It is the second largest crater, after Herschel.