On matching the spectrum of Io - Variations in the photometric properties of sulfur-containing mixtures

Details On matching the spectrum of Io - Variations in the photometric properties of sulfur-containing mixtures On matching the spectrum of Io - Variations in the photometric properties of sulfur-containing mixtures

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979icar...37..249v&link_type=abstract

Icarus, vol. 37, Jan. 1979, p. 249-255.

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Astronomical Photometry, Io, Planetary Composition, Sulfur, Binary Mixtures, Dilution, Galilean Satellites, Goniometers, Magnesium Oxides, Particle Size Distribution, Quantitative Analysis, Reflectance, Room Temperature, Surface Properties, Io, Satellites, Jupiter, Spectrum, Photometry, Sulfur, Albedo, Surface, Contamination, Mixing, Optical Properties, Spectral Reflectivity, Magnesium Oxide

Scientific paper

The problem of comparing laboratory spectra of sulfur-containing binary mixtures with the spectrum of Io is discussed. For the satellite, the observable is the geometric albedo as a function of wavelength, whereas in the laboratory one often measures some other type of albedo. A previous paper demonstrated that for pure sulfur the multiplicative factor which converts the laboratory albedos to geometric albedos can be strongly wavelength dependent. The present paper demonstrates that this is also true for binary sulfur-containing mixtures. Furthermore, there is no universal conversion factor applicable to all binary mixtures, nor can the factor be interpolated for a particular mixture from the conversion factors of the two end members. The conversion factor is a function not only of the specific composition of a binary mixture but also of the relative particle size distributions of the two components, and must be measured specifically for each individual sample if a quantitative comparison between a laboratory sample and Io's surface is desired.

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