ESA and JAXA’s RAMSES planetary defence spacecraft was switched on for the first time on 23 September 2026, marking a major milestone in its time-critical development schedule. The mission is targeting the near-Earth asteroid (99942) Apophis, with launch currently planned for 2028 and arrival at Apophis in February 2029, ahead of its exceptionally close Earth flyby in April 2029. JAXA’s participation includes key spacecraft technologies and science instruments, including the Thermal Infrared Imager (TIRI) and lightweight Solar Array Wings.
For the Lunar Ark, RAMSES matters because it is a real-world rehearsal for rapid planetary-defense execution under a fixed deadline. The mission will measure how Earth’s gravity alters Apophis, improving understanding of asteroid structure, surface dynamics, and response to external forces; those data improve models for impact-risk assessment, autonomous rendezvous, and contingency planning for lunar assets exposed to debris, micro-impactors, or future deflection operations. The mission also demonstrates multinational coordination, launch integration, and instrument miniaturization under schedule pressure — all directly relevant to sustaining a long-duration lunar archive and habitat.
Ark action: monitor RAMSES system integration milestones, the 2028 launch campaign, and any published results from Apophis pre-encounter and post-encounter observations. Integrate the mission’s lessons into lunar hazard models, deep-space autonomy requirements, and planetary-defense playbooks, especially any findings on rubble-pile mechanics, spin-state changes, and tidal-response behavior. Prioritize technical digestion of JAXA’s TIRI and lightweight power-system contributions for future low-mass, high-reliability Ark spacecraft and surface systems.