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Phase angle-induced spectral effects are important to characterize since theyaffect spectral band parameters such as band depth and band center, andtherefore skew mineralogical interpretations of planetary bodies viareflectance spectroscopy. Dwarf planet (1) Ceres is the next target of NASA'sDawn mission, which is expected to arrive in March 2015. The visible andnear-infrared mapping spectrometer (VIR) onboard Dawn has the spatial andspectral range to characterize the surface between 0.25-5.0 microns. Ceres hasan absorption feature at 3.0 microns due to hydroxyl- and/or water-bearingminerals (e.g. Lebofsky et al. 1981, Rivkin et al. 2003). We analyzed phaseangle-induced spectral effects on the 3-micron absorption band on Ceres usingspectra measured with the long-wavelength cross-dispersed (LXD: 1.9-4.2microns) mode of the SpeX spectrograph/imager at the NASA Infrared TelescopeFacility (IRTF). Ceres LXD spectra were measured at different phase anglesranging from 0.7o to 22o. We found that the band center slightly increases from3.06 microns at lower phase angles (0.7o and 6o) to 3.07 microns at higherphase angles (11 o and 22o), the band depth decreases by ~20% from lower phaseangles to higher phase angles, and the band area decreases by ~25% from lowerphase angles to higher phase angles. Our results will have implications forconstraining the abundance of OH on the surface of Ceres from VIR spectraldata, which will be acquired by Dawn starting spring 2015.

Phase Angle Effects on 3-micron Absorption Band on Ceres: Implications for Dawn Mission