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TPF-I SWG Report - Exoplanet Exploration Program - NASA

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F L I G H T S YSTEM C ONFIGURATION<br />

Table B-5. <strong>TPF</strong>-I Collector Spacecraft Design Summary<br />

Parameter<br />

Design Team Allocation<br />

Architecture<br />

Modular, process-driven, fully redundant<br />

Attitude control<br />

3-axis, zero-net-momentum<br />

Attitude determination<br />

Star trackers, inertial reference unit<br />

Attitude control actuators<br />

4 reaction wheels, 16 RCS thrusters<br />

Formation acquisition sensors S-band and sensors<br />

Propulsion / RCS<br />

Ion thrusters, Isp = 2500–3500 s<br />

Delta-V capability<br />

750 m/s<br />

Solar array type / size Rigid panel, 5.4 m 2<br />

Solar cell type<br />

Cascade multi-junction, 28% efficiency (BOL)<br />

Array power (EOL)<br />

862 W (45° off-point)<br />

Battery type / Capacity<br />

Li-ion, 19.8 A-h<br />

Thermal shield<br />

5-layer, deployable sunshade<br />

Telecommunications<br />

X-band up/down (contingency mode)<br />

Data rates up/down<br />

2 kbps / 16 kbps<br />

Inter-spacecraft telecommunications UHF full-duplex, 2.0 Mbps<br />

173

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