On 21 September 2026, ESA and JAXA’s RAMSES planetary-defence spacecraft achieved its first integrated switch-on at OHB Italia in Milan. Engineers powered the onboard computer and connected subsystems together for the first time, beginning full-scale system testing. The spacecraft must launch by spring 2028 to rendezvous with the cruise-liner-sized asteroid Apophis during its close Earth passage on 13 April 2029, leaving less than three and a half years from contract signing to launch.[1][2]
The milestone demonstrates that time-critical planetary-defence missions can progress from subsystem testing to integrated spacecraft operations under severe schedule constraints. RAMSES will provide close-range observations of Apophis, improving understanding of asteroid structure, behaviour and hazard assessment. For the Lunar Ark, this reinforces that long-term survival requires both hardened off-world infrastructure and active detection, characterisation and mitigation of impact threats; lunar settlements cannot assume Earth-based civilisations will remain intact.[1]
The Ark team should track RAMSES integration, launch readiness, Apophis observations and the operational lessons from its compressed development schedule. These lessons should inform an Ark planetary-threat protocol covering asteroid catalogues, autonomous optical and radar monitoring, impact-probability thresholds, hardened archives and coordination with ESA, JAXA and other planetary-defence programmes. RAMSES mission data should be preserved as a reference dataset for asteroid composition, orbital dynamics and spacecraft reliability.[1]