RPC (Rosetta Plasma Consortium):
Five sensors measure the physical properties of the nucleus, examine the structure of the inner coma, monitor cometary activity, and study the comet’s interaction with the solar wind.

The Orbiter's scientific payload includes 11 experiments, in addition to the Lander. Scientific consortia from institutes across Europe and the United States have provided these state-of-the-art instruments. All of them are located on the side of the spacecraft that will permanently face the comet during the main scientific phase of the mission.