The Attitude and Orbit Control of XMM
Publication date: 01 December 1999
Authors: Elfving, A.
Journal: ESA Bulletin
Attitude and orbit control of the XMM spacecraft relies on two subsystems on-board: the Attitude and Orbit Control Subsystem (AOCS) and the Reaction Control Subsystem (RCS). Together they must provide:
- stable Sun-pointing after the spacecraft's separation from the launcher and during solar-array deployment
- increase the spacecraft's perigee altitude by means of a chemical propulsion delta-V of about 210 ms-1
- provide undisturbed, high-accuracy, three-axis pointing during scientific observations lasting up to 40 h
- slew the spacecraft between observations, and before and after perigee ensure that the Sun remains more than 15 deg away from the telescope at all times.