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Proceedings Paper

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
Author(s): Steve C. Kwan; Loren C. Zumwalt; Aleck L. Lee
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Paper 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.

Paper Details

Date Published: 19 October 1994
PDF: 10 pages
Proc. SPIE 2261, Optical System Contamination: Effects, Measurements, and Control IV, (19 October 1994); doi: 10.1117/12.190160
Show Author Affiliations
Steve C. Kwan, Lockheed Technical Operations Co., Inc. (United States)
Loren C. Zumwalt, Lockheed Missiles & Space Co., Inc. (United States)
Aleck L. Lee, Lockheed Missiles & Space Co., Inc. (United States)


Published in SPIE Proceedings Vol. 2261:
Optical System Contamination: Effects, Measurements, and Control IV
A. Peter M. Glassford, Editor(s)

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