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The ESA tracking station network – Estrack – is a worldwide system of ground stations providing links between satellites in orbit and our operations centre ESOC. ESA tracking station The core Estrack network comprises 10 stations in seven countries. The essential task of all ESA tracking stations is to communicate with our missions, up-linking commands and down-linking scientific data and spacecraft status information. Estrack stations also gather radiometric data to help mission controllers know the location, trajectory and velocity of their spacecraft.