Determining the mass of Didymos' secondary by visual imaging

A critical requirement for the Asteroid Impact Mission (AIM) is the ability to determine the mass of Didymos’ secondary with an accuracy of about 10 %. On one hand, this is necessary in order to plan the delivery of the lander MASCOT-2 with sufficient precision, on the other hand, it is needed to estimate the momentum transfer by the impact of the DART spacecraft and hence to verify the concept of asteroid deflection.