EMXYS and the Royal Observatory of Belgium have been selected by the European Space Agency to provide a gravimeter for the Juventas spacecraft that will land on asteroid Dimorphos as part of the European Space Agency's planetary defence programme.

EMXYS and the Royal Observatory of Belgium will provide the GRASS instrument that will make measurements on the gravity field of the asteroid Dimorphos. The gravimeter is part of the Juventas Cubesat, manufactured by GomSpace Luxemburg, that will land on the asteroid in 2027, after travelling onboard the ESA's Hera spacecraft to its vicinity. The GRASS will be the first dedicated extraterrestrial gravimeter since the Apollo era and the first ever on an asteroid.

The gravimeter is an instrument proposed, designed and developed by the Royal Observatory of Belgium in cooperation with EMXYS, which will provide the final space version of the instrument for the mission.

The gravimeter is expected to send to Earth precious data on the mass distribution, internal structure and dynamics of Dimorphos. This information will improve the knowledge for setting up future diversion strategies on asteroids that may have a threat of colliding with Earth.

The exploration of solar system bodies to better understand their evolution and origin has been one of the main research areas of the Royal Observatory of Belgium who also has a strong heritage on gravimetry and geophysics.

After its participation in three space missions in orbit around Earth and one suborbital mission, this is the first time EMXYS participates in a deep space endeavor far away from Earth orbital environment.

Due to launch in 2024, Hera is the European contribution to an international double-spacecraft collaboration to a binary asteroid system: The 780 m-diameter main body, Didymos is orbited by a 160 m moon Dimorphos. NASA's DART mission will first perform a kinetic impact on Dimorphos, then Hera will follow-up with a detailed post-impact survey that will turn this grand- scale experiment into a well-understood and repeatable planetary defence technique.

Ozgur Karatekin, Senior Research Scientist at the Royal Observatory of Belgium, stated that "Hera will be the first mission to perform a detailed characterization of a binary asteroid system. GRASS will monitor surface accelerations to reveal the subsurface structure and to better constrain the spin-orbit dynamics of the binary system.

"The gravitational forces on such a small body, likely composed of loosely held-together mounds of debris are very small (~ 6 order of magnitude smaller than the gravity on Earth). The GRASS is designed specifically to operate in such microgravity environment and in harsh surface conditions."

Jose A. Carrasco, EMXYS CEO, stated that "this mission ensures EMXYS position within the space sector, either within Earth orbit or in Deep Space, and makes the company's technology highly reliable to become a leading producer of high-performance satellite platforms and payloads within the New Space market".

Ian Carnelli, Hera project manager at the European Space Agency, stated that "GRASS will allow us to gather additional information on the internal structure of Dimorphos which is crucial to calibrate the numerical impact codes for planetary defence. We are thrilled to continue this excellent collaboration with the Royal Observatory of Belgium and EMXYS, the Juventas CubeSat will now have an incredible suite of instruments".

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