Abstract

The X-80 spacecraft represents a candidate for selection as the next project in ESA's scientific program. The three-axis stabilized satellite of 1050 kg includes an instrument payload of 500 kg for astrophysical observations throughout the X-ray spectrum. Pointing (measuring) accuracy of 5(1) arc min is required. Six solar panels provide 1 kW of electrical power over a three-year operational lifetime. Command and data transfer take place via one ground station. Up to 250 Mbits of scientific data can be stored on board and will be dumped during a pass of 10 min every orbit. An Ariane rocket will launch the satellite into a circular equatorial earth orbit at 600 km altitude. A phase A study was completed by Dornier System in 1981 on behalf of ESA, and work is being continued during a follow-on study concentrating on selected topics.

© 1982 AIAA