To make it work you need to edit your sol.cfg and add an extra planet.For example, if your last planet is Planet9 = Neptune, just addlanet10 = Ceres
Works with both Orbiter 2010 and 2016
Original map credits:
Colorized Map of Ceres (Mercator Projection)
Dawn's mission is managed by the Jet Propulsion Laboratory for NASA's Science Mission Directorate in Washington. Dawn is a project of the directorate's Discovery Program, managed by NASA's Marshall Space Flight Center in Huntsville, Alabama. UCLA is responsible for overall Dawn mission science. Orbital ATK, Inc., in Dulles, Virginia, designed and built the spacecraft. The German Aerospace Center, the Max Planck Institute for Solar System Research, the Italian Space Agency and the Italian National Astrophysical Institute are international partners on the mission team.