The Scout missions are an element of ESA’s Earth Observation programme that demonstrate innovative science concepts using agile small satellites, enabling fast deployment and validation of new technologies.

The UK is leading the development of the first Scout mission, HydroGNSS, leveraging national strengths in small satellite engineering and Earth Observation science. Scheduled for launch in late 2025 with SpaceX, HydroGNSS will support climate monitoring and environmental resilience by delivering vital data more quickly and cost-effectively.

HydroGNSS

HydroGNSS is the first ESA Scout mission, led by the UK and built by SSTL, launching November 2025. It will use small satellites and GNSS -Reflectometry to deliver rapid, affordable measurements of key hydrological climate variables su

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