Role of contamination analysis in resolving concerns relating to the Hubble Space Telescope (HST) open-door deployment at the conclusion of the first servicing mission

Steve C. Kwan; Loren C. Zumwalt; Aleck L. Lee

doi:10.1117/12.190160

19 October 1994 Role of contamination analysis in resolving concerns relating to the Hubble Space Telescope (HST) open-door deployment at the conclusion of the first servicing mission

Steve C. Kwan, Loren C. Zumwalt, Aleck L. Lee

Author Affiliations +

Proceedings Volume 2261, Optical System Contamination: Effects, Measurements, and Control IV; (1994) https://doi.org/10.1117/12.190160
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

For the Hubble Space Telescope (HST) First Servicing MIssion (FSM) Project there was a high level requirement which stated that the Endeavour would not carry extra propellant for an extra EVA after the final regularly scheduled fifth EVA. Because of this the HST FSM Project needed to assess the feasibility of redeploying the HST with its Aperture Door (AD) open from the Endeavour in order to prevent the situation that the AD may not open by radio command after separation. Contamination was one of the major concerns of the HST scientific community. The prospect that the opened AD may allow unacceptable amount of Endeavour generated contaminant to enter the HST aperture and subsequently depositing onto the Primary Mirror seemed too big a risk. To assess this potential contamination threat and to put it into proper perspective, Lockheed performed a series of comprehensive contamination analyses to predict expected Endeavour generated molecular and particulate contaminant accretions on the HST primary mirror during open-AD re-deployment. This paper describes the analysis approach and some of the conclusions reached for the HST FSM redeployment phase.

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Steve C. Kwan, Loren C. Zumwalt, and Aleck L. Lee "Role of contamination analysis in resolving concerns relating to the Hubble Space Telescope (HST) open-door deployment at the conclusion of the first servicing mission", Proc. SPIE 2261, Optical System Contamination: Effects, Measurements, and Control IV, (19 October 1994); https://doi.org/10.1117/12.190160

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