Pre-Phase A Report - Lisa - Nasa

158 Chapter 7 Spacecraft Design
7.4 Mass and power budgets
The spacecraft mass and power bugets are given in Table 7.1 below. Power budgets are
given for two cases: power in operational orbit, and power during transfer.
Subsystem Mass (kg) Operational Power in Transfer
Power (W) Orbit (W)
Payload 70.0 72.2
Payload Shield 14.2
Structure 41.1
Thermal 1.7 17.0
Attitude Measurement 6.0 2.1 12.7
Propulsion (FEEP) 22.0
Telecommunications 9.9 26.4 12.0
Data Handling 14.5 13.1 9.9
Power Subsystem 12.2 14.8 6.8
Cabling 15.1
Total 202.8 150.6 58.4
Table 7.1 Spacecraft mass and power budgets.
The mass and power budgets of the propulsion module are given in Table 7.2 .
Subsystem Mass (kg) Power (W)
Structure 52.0
Thermal 3.0 17.0
Propulsion SEP 44.2 490.0
Propulsion Hydra 7.6 0.8
Power 12.6 26.9
Solar Array 4.2 1.0
Cabling 8.0
Total 131.6 535.7
Table 7.2 Propulsion module budgets.
3-3-1999 9:33 Corrected version 2.08