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Solar absorptance degradation of optical solar reflector radiators on the Spacenet satellitesTelemetry data are presented for two communications hybrid satellites, Spacenet I and Spacenet II, collected to determine the long-term temperature trend and associated solar absorptance degradation of the optical solar reflectors (OSRs). A thermal model was used to calculate the thermal sensitivity of various OSR components to changes in the solar absorptance and to determine absolute values of solar absorptance. The separation of the data into sunlit and nonsunlit periods made it possible to confirm the hypothesis that degradation occurs under the catalytic activity of direct sunlight on the spacecraft contaminants. The differences found between the degradation rates for Spacenet-I and Spacenet-II satellites and between the present results and published reports on other satellites are considered to be related to variations in the volume of spacecraft contaminants.
Document ID
19930028022
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Naegeli, Charles R.
(GTE Spacenet Corp., McLean, VA; NASA, Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 15, 2013
Publication Date
October 1, 1992
Publication Information
Publication: Journal of Spacecraft and Rockets
Volume: 29
Issue: 5
ISSN: 0022-4650
Subject Category
Spacecraft Design, Testing And Performance
Accession Number
93A12019
Distribution Limits
Public
Copyright
Other

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