Outgassing of ISS payload pointing devices

Computer Science

Scientific paper

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Space Environment, Materials, Iss

Scientific paper

Hexapod and the Coarse Pointing Device (CPD) are specific devices currently planned for utilization on the International Space Station (ISS) external payload facilities, with the scope of pointing scientific payload instrumentation. During the design and development phases, the devices have been extensively analyzed for their outgassing characteristics, as relevant for the potential adverse contamination effects on sensitive instrumentation surfaces. Outgassing kinetics characteristics of selected materials in dedicated test facilities have been determined as per guidelines established in ASTM-E-1559, and ESTEC VBQC method. An analysis of molecular emissions and depositions from the integrated devices has been conducted. Outgassing rates (OGRs) on representative targets enveloping the complete payloads have been calculated. Generally, the outgassing emissions comply with the imposed requirements. In case of potential requirement violations, and for the protection of sensitive surfaces, countermeasures have been devised, such as vacuum bake-out and directional venting.

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