ESA's Hera mission set to launch gravimeter to Dimorphos asteroid.

The European Space Agency's Hera mission, which will complete the first post-impact survey of the asteroid that NASA's Double Asteroid Redirection Test collided with in September 2022, is closer to launch after the gravimeter for small solar system objects (GRASS) completed its ground tests. GRASS is a tiny instrument that can measure the gravity levels of an asteroid and will be carried by Hera to measure the minuscule gravity levels of Dimorphos, the orbiting moonlet of the 65803 Didymos binary system. GRASS is designed to measure the expected gravity levels and the precise mass of the Dimorphos asteroid.