Jose Carrasco notes: “The Royal Observatory of Belgium contributed the mechanical design, including the two blades, cradles and rotating motors, while EMXYS had to put together sufficiently compact electronics to operate the instrument, including copious use of commercial off the shelf parts.”

GRASS will be turned on as Juventas gradually falls to the surface of Dimorphos following the conclusion of its subsurface radar imaging campaign. The gravimeter will record the impact on the asteroid, any subsequent bounces and then any shifts in surface gravity over time, due to the influence of its parent Didymos asteroid.