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Measurement of the Solar Absorptance and Thermal Emittance of Lunar SimulantsThe first comparative study of the reflectance spectra of lunar simulants is presented. All of the simulants except one had a wavelength-dependant reflectivity ( ( )) near 0.10 over the wavelength range of 8 to 25 m, so they are highly emitting at room temperature and lower. The 300 K emittance ( ) of all the lunar simulants except one ranged from 0.884 to 0.906. The 300 K of JSC Mars-1 simulant was 0.927. There was considerably more variation in the lunar simulant reflectance in the solar spectral range (250 to 2500 nm) than in the thermal infrared. Larger particle size simulants reflected much less than those with smaller particle size. As expected, the lunar highlands simulants were more reflective in this wavelength range than the lunar mare simulants. The integrated solar absorptance ( ) of the simulants ranged from 0.413 to 0.817 for those with smaller particles, and 0.669 to 0.906 for those with larger particles. Although spectral differences were observed, the for the simulants appears to be similar to that of lunar soils (0.65 to 0.88). These data are now available to be used in modeling the effects of dust on thermal control surfaces.
Document ID
20100033114
Document Type
Technical Memorandum (TM)
Authors
Gaier, James R. (NASA Glenn Research Center Cleveland, OH, United States)
Street, Kenneth W. (NASA Glenn Research Center Cleveland, OH, United States)
Gutafson, Robert J. (Orbital Technologies Corp. Madison, WI, United States)
Date Acquired
August 25, 2013
Publication Date
August 1, 2010
Subject Category
Lunar and Planetary Science and Exploration
Report/Patent Number
E-17366-1
NASA/TM-2010-216788
AIAA Paper 2010-6025
Meeting Information
40th International Conference on Environmental Systems(Barcelona)
Funding Number(s)
WBS: WBS WBS 119103.04.05.18
Distribution Limits
Public
Copyright
Public Use Permitted.

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