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The recently launched Lucy mission aims to understand the dynamical historyof the Solar System by examining the Jupiter Trojans, a population of primitiveasteroids co-orbital with Jupiter. Using the G280 grism on the Hubble SpaceTelescope's Wide Field Camera 3 we obtained near ultraviolet spectra of four ofthe five Lucy mission targets -- (617) Patroclus-Menoetius, (11351) Leucus,(3548) Eurybates, and (21900) Orus -- to search for novel spectral features. Weobserve a local reflectance minimum at 0.4 $\mu$m accompanied by an increase inreflectance from 0.35-0.3 $\mu$m in the spectra of Patroclus and Orus. We usethe principles of Rayleigh scattering and geometric optics to develop a Hapkeoptical model to investigate whether this feature can be explained by thepresence of submicroscopic grains on Trojan surfaces. The near ultraviolet"bump" feature can be explained by scattering due to fine-grained opaques(iron, amorphous carbon, or graphite) with grain sizes ranging from 20 - 80 nm.

Ultraviolet Spectroscopy of Lucy Mission Targets with the Hubble Space Telescope