Mickey Mouse universe instead; both in "Mickey Mouse Adventures" and in Disney's contemporary reprints of vintage stories in "Walt Disney's Comics and Stories" (1991–93). Later publisher Gemstone and the present Boom Studios have continued the use of Mouseton from 2003 onward. Strangely, in-between licensee Gladstone (1993–99) usually left Mickey's city unnamed, or—very rarely—referenced it as Duckburg, better known as Donald Duck's hometown. Mouseton's location in Calisota and its positioning with regard to Duckburg (the cities being next to one another) were the subject of speculation early on, but have generally been treated consistently in American publications from 2003 onward. In Disney comics published
1313 Berna rotational light-curve of "Berna". Light-curve analysis gave a rotation period of hours with a brightness variation of 0.28 magnitude (). In November 2007, photometric observations at Cerro Tololo, Chile, using its 0.9-meter Prompt5 telescope in combination with the Spitzer Space Telescope gave a concurring period of 25.46 hours with an amplitude of 0.5 magnitude (). Other light-curves were also obtained by several amateur astronomers giving a period of 6, 25.4 and 25.45 hours, respectively (). In February 2004, a satellite orbiting the asteroid was discovered. The moon, designated S/2004 (1313) 1, measures about 11 kilometers in diameter and orbits "Berna"