Space Situational Awareness Programme

observatory in Zimmerwald in the canton of Bern, Switzerland

PROBA-2 is the second satellite in the European Space Agency's series of PROBA low-cost satellites that are being used to validate new spacecraft technologies while also carrying scientific instruments. PROBA-2 is a small satellite (130 kg) developed under an ESA General Support Technology Program (GSTP) contract by a Belgian consortium led by Verhaert (now QinetiQ Space) of Kruibeke, Belgium. The nominal mission duration was two years. As of 2022, the mission continues.

astronomical observatory in Costitx in Spain

right|thumb|EISCAT Kiruna Radar (diameter 32m)

european Space Agency observatory

Royal Air Force operated ballistic missile early warning and space surveillance station in North Yorkshire, England

French radar-based space surveillance system

facility for atmospheric and radio research

astronomical observatory near Bologna, Italy

observatory in Carinthia

European Space Agency program

The Tracking & Imaging Radar (TIRA) system serves as the central experimental facility for the development and investigation of radar techniques for the detection and reconnaissance of objects in space, and (to a certain degree) of air targets.