T-matrix and Hapke Modeling of the Thermal Infrared Spectra of Trojan Asteroids and (944) Hidalgo: Implications for Their Regolith Particle Size and Porosity

Abstract Trojan asteroids (911) Agamemnon, (1172) Aneas, and (624) Hektor primitive asteroid (944) Hidalgo share a common thermal infrared spectral feature: prominent 10 μ m plateau that is also present in cometary comae spectra. To fit these spectra, we modeled individual minerals using the light-scattering multiple sphere T-matrix (MSTM) Hapke reflectance models. Modeled mineral spectra were then combined weighted least-squares (WLS) model included library of varied particle sizes porosities. We later refined our method by abundances, sizes, porosities computed WLS as an input to rerun MSTM able features mixture olivine components, fine particles, lunar-like The are comparable composition size spectrally similar bodies such comet Hale-Bopp CO3 CY chondrite meteorites. While required for modeling like those on lunar surface, they lower than meteorites higher comets.