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What is SST?
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How does it work?
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What are the EU SST services?
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EUSPA, the EU SST Front Desk
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Facts and figures
What is SST?
The EU Space Surveillance and Tracking (EU SST) protects satellites and space infrastructure from collision risks, monitors in-orbit fragmentations, and uncontrolled re-entries, protecting EU missions like Galileo, EGNOS, Copernicus and GOVSATCOM, as well as national and commercial spacecraft. As part of the EU Space Programme’s Space Situational Awareness component, it safeguards the European economies, societies and citizens who rely on space-based services.
The EU SST Front Desk, managed by EUSPA, is the central access point for SST services and information, providing satellite operators with timely warnings and expert guidance to prevent collisions and protect space assets.
Launch
EU SST was initially established in 2014, and since 2021 it has been part of the EU Space Programme.
Implementation
The EU SST Partnership, together with EUSPA acting as the EU SST Front Desk, work together to develop a European SST capability.
Purpose
To contribute to the safety and sustainability of space operations by providing a set of Space Surveillance and Tracking services.
How does it work?
SST works by three functions:
EU SST relies on a network of ground-based sensors owned by EU Member States that survey and track artificial objects orbiting Earth.
Advanced data processing and analysis capabilities turn thousands of daily measurements from the sensors into meaningful information for satellite owners and operators.
Services are provided to users through the SST Portal, managed by EUSPA. The EU SST Front Desk coordinates alerts, performance monitoring, and user support, acting as the interface between the EU SST Partnership and satellite operators.
What are the EU SST services?
EU SST provides three services:
Collision Avoidance
Risk assessment of collision between spacecraft or between spacecraft and space debris, and collision avoidance alerts
Re-entry Analysis
Risk assessment of uncontrolled re-entry of man-made space objects into the Earth’s atmosphere and related information
Fragmentation Analysis
Detection and characterisation of in-orbit fragmentations, break-ups or collisions
EUSPA, the EU SST Front Desk
- EUSPA manages and operates the EU SST Front Desk.
- The Front Desk is the main interface for the delivery of SST information and services, including activities related to user support, performance monitoring, engagement and promotion.
- The SST Front Desk is hosted at EUSPA’s Galileo Security Monitoring Centre (GSMC) in Madrid.
- EUSPA also contributes to EU SST’s security activities, including the definition of the programme’s security requirements and the implementation of security monitoring tasks.
Facts and figures
Slides - CASSINI Challenges Info Webinar
Q & A - Clarification Notes #1 #2 #3
Deadline for the submission of applications
Evaluations
Award ceremony at CASSINI Entrepreneurship Days in Prague
CASSINI Challenges 2026
CASSINI Challenges is the ultimate launchpad for space entrepreneurs. Whether you are building upstream infrastructure or downstream applications, we help you turn EU Space data and assets (Galileo, Copernicus, SSA/SST, or GOVSATCOM) into commercial successes.
Across several successful editions, we’ve already fueled 149 winners. Now, it’s your turn. Solve real-world challenges, secure strategic funding, and lead the next wave of European space innovation.
CASSINI CHALLENGES - Turn Space Technology into Opportunity
Use EU Space data or technology to solve global challenges. Leverage Galileo, Copernicus, SSA/SST, or GOVSATCOM to enhance the EU Space Programme and prove commercial potential. Learn more.
12 winners get a €100,000 prize award to accelerate their growth. We reward technological excellence and proven commercial readiness. The MVP requires a minimum Technology Readiness Level (TRL) ≥ 5 and a minimum Commercial Readiness Level (CRL) ≥ 4. Learn more.
Turn your idea into a successful space business with CASSINI. Join a community that helps entrepreneurs connect with investors, events, and real opportunities across the space sector. Learn more.
Timeline
Past winners
Rules of contest
Please carefully read the competition's Rules. The document includes the competition’s objective, eligibility, exclusion, and award criteria among other key details.