ESA’s Hera mission launched on 7 October 2024 as Europe’s contribution to the international AIDA campaign. NASA’s DART spacecraft struck Dimorphos, the smaller body in the Didymos binary asteroid system, on 26 September 2022 and measurably changed its orbit. Hera is designed to rendezvous with the system, survey the impact aftermath, and determine Dimorphos’s mass, internal structure, surface properties, and the consequences of the collision. Binary asteroids represent approximately 15% of known asteroids.[3]
The mission addresses the main uncertainty in kinetic deflection: asteroid response depends on composition, porosity, mass distribution, and ejecta production. Hera’s visual, laser, and radio-science mapping, supported by the Milani and Juventas CubeSats, can improve models for selecting impact energy and predicting residual trajectories. For lunar habitation, this supports hazard forecasting for Earth, the Moon, and cislunar infrastructure, while demonstrating compact autonomous spacecraft and deep-space communications architectures.[3][10]
The Ark team should track Hera’s released measurements and incorporate asteroid-structure uncertainty into civilisational risk models. It should also monitor ESA’s Ramses mission, planned for a 2028 launch to rendezvous with Apophis, because Ramses reuses Hera-derived technology and demonstrates rapid reconnaissance before selecting a deflection method. Ark planning should preserve protocols for independent optical and radar tracking, impactor deployment, orbital prediction, and sheltering against debris or atmospheric effects.[6][9]