Deborah Domingue LorinNASA Planetary Mission Data AnalysisWhat Shapes a Spectrum? Looking Beyond the MineralogyReflectance spectra (brightness variations as a function of wavelength) contain information pertaining to composition (identification of minerals), chemistry (alteration due to processes such as space weathering), and texture (absorption band characteristics indicative of particle size). Photometric phase curves (brightness variations as a function of viewing geometry) also contain information pertaining to surface regolith textural properties (particle size, porosity, roughness). For small-bodies, such as asteroids, composition, chemistry, and textural properties of the surface regolith are deduced from the study of reflectance spectra (sometimes in the form of broad-band color imaging) and photometric phase curves. However, reflectance spectra can vary as a function of viewing geometry, especially geometries invoked by an irregularly shaped surface. It is plausible that some of the variation in spectral properties currently observed in the asteroid population could simply be do to photometric effects induced by irregularly shaped surfaces. This could potentially affect many interpretations of our vast library of asteroid reflectance data. It is important to determine the magnitude of this affect and to have a method for photometrically calibrating (removing the photometric signature) reflectance spectra of asteroids. Analysis of photometrically calibrated spectra will provide a more robust study of compositional, chemical, and textural similarities and differences across an asteroid and between asteroids.