Dawn

Dawn used solar-electric ion propulsion to orbit Vesta and then Ceres, comparing two differentiated bodies in the asteroid belt rather than conducting a single flyby.

dawn is a planetary orbiter focused on Vesta and Ceres; its mission record separates planned measurements from the results actually documented.

For dawn, the defining design choice was to use a planetary orbiter for orbiting two separate worlds. That choice determines what the spacecraft can observe, how it moves or operates, and what risks the team must manage.

For dawn, the cited record places the spacecraft at Vesta and Ceres; the engineering profile keeps its instrument, power, communications, and navigation details separate from the mission narrative.

Documented result: Orbiting two separate worlds. For dawn, that result is the evidence users can compare with the original objective and source record.

The connected engineering entry for dawn explains which hardware produced or supported these measurements.