To take images of the solar corona, Proba-3 carries ASPIICS, short for Association of Spacecraft for Polarimetric and Imaging Investigation of the Corona of the Sun. This instrument, developed for ESA by Centre Spatial de Liège, Belgium, is made up of a large occulting disc mounted on the Occulter spacecraft and a solar coronagraph system carried by the Coronagraph spacecraft.
In their most precise formation, the Coronagraph and the Occulter will be flying 150 m apart, maintaining their relative position down to a single millimetre. The occulting disc will cover the bright body of the Sun, casting a shadow onto the optical instrument on the Coronagraph spacecraft and allowing it to study the solar corona.