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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-dependent reflectivity, rho(lambda), near 0.10 over the wavelength range of 8 to 25 microns, so they are highly emitting at room temperature and lower. The 300 K emittance, epsilon, of all the lunar simulants except one ranged from 0.884 to 0.906. The 300 K epsilon 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 alpha of the simulants ranged from 0.413 to 0.817 for those with smaller particles and 0.669 to 0.906 for large particles. Although spectral differences were observed, the total integrated alpha 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
Document Type
Conference Paper
Gaier, James R.
(NASA Glenn Research Center Cleveland, OH, United States)
Street, Kenneth W.
(NASA Glenn Research Center Cleveland, OH, United States)
Gustafson, Robert J.
(Orbital Technologies Corp. Madison, WI, United States)
Date Acquired
August 24, 2013
Publication Date
July 11, 2010
Subject Category
Solar Physics
Report/Patent Number
Meeting Information
40th International Conference on Environmental Systems(Barcelona)
Funding Number(s)
WBS: WBS 119103.04.05.18
Distribution Limits
Public Use Permitted.

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