GomSpace and ESA have signed a contract to develop a 6U nanosatellite, named Juventas to join the HERA mission. The Juventas nanosatellite will perform scientific tasks and eventual land on the Didymoon asteroid. The contract value is EUR 400.000. The nanosatellite will be a so called 6U nanosatellite approximately the size of a shoebox and mass of approximately 12 kilograms. It will be part of ESA's HERA mission to a binary asteroid system, which is the first of its kind in Europe. Juventas will be the very first nanosatellite developed for deep space missions by GomSpace. In close orbit around Didymoon, Juventas will measure the gravity field as well as the internal structure of the asteroid. In collaboration with HERA, Juventas will perform satellite-to-satellite radio-science experiments and carry out low-frequency radar survey of the asteroid interior. This will be finalised with a landing using the dynamics of any likely bouncing impact events to capture details of the astroid's surface material properties. GomSpace is the project prime and will be responsible for delivering the spacecraft and the mission design. Collaborators include GMV Innovating Solutions from Romania leading the guidance, navigation and control subsystem, and, Brno University of Technology from the Czech Republic and Astronika from Poland delivering the radar instrument. Additionally, the Juventas science team includes collaborators from the Royal Observatory of Belgium and University of Grenoble Alpes.