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Color differences on the lunar surface
[摘要] Both a detailed literature survey and a newobservational study were performed to determine andextend the knowledge of spectral reflectivity differences(color differences) on the lunar surface in the extendedvisible wavelength region. A survey of the extensiveand disorganized literature revealed few positivelyknown facts and indicated the need for an accurate, multi-passband observational study of a number of lunar areasof differing morphology. A 21-filter (0.4µ- 0.8µ),double beam photoelectric photometer was designed andconstructed to observe differentially 83 lunar areas,some many times, to an accuracy of 0.1% to 0.3%. Someresults were the discovery of: (1) many color variationsup to 10% with some to about 60%, (2) a dependence ofrelative color on phase angle but no temporally varyingluminescence, (3) broadband absorption features onspectral reflectivity curves and possibly some less broad,low amplitude (0.2%- 0.5%) humps, (4) a dependence ofspectral curve shape on lunar morphology and, (5) nouniversal dependence of color on brightness, althoughsome mare areas show this tendency. These results indicatethat color differences are caused mainly by compositional differences and that the shapes of the spectral reflectivity curves give some indications of the rock and mineral composition of the lunar surface.
[发布日期]  [发布机构] University:California Institute of Technology;Department:Geological and Planetary Sciences
[效力级别]  [学科分类] 
[关键词] Geology [时效性] 
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