1.2.4.5 Attitude and Orbit Control System For the AOCS high, performance electric thrusters (ion-bombardment) were selected with a specific impulse between 7000 s and 13000 s, diameters between 100 cm and 120 cm, and a weight of 120 kg to 150 kg each. As propellant argon was selected (see fig. 2.4.2). The dominant stationkeeping propellant requirement is the correction of the solar pressure perturbation. This requirement, however, could be reduced by higher than 0.5° longitude drifts allowed. Fig.2.4.2: ION PROPELLANT SELECTION CRITERIA [Source: 78/35 ] 1.2.5 Space Transportation (References: 76/2,76/7,77/5,77/8,77/11,77/13,77/24,78/35, 78/36,78/55,78/63.) 1.2.5.1 General This category implies all space-transportation activities. The objectives of a total SPS transportation fleet are:
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