# # Program information file # PROGRAM_ID 2021A087 PROGRAM_TITLE Near-Infrared Spectroscopy of Outer Main Belt Asteroids PROGRAM_INV1 Driss Takir PROGRAM_INV2 Joshua Emery PROGRAM_INV3 PROGRAM_INV4 PROGRAM_INV5 PROGRAM_SCICAT solar system PROGRAM_ABSTRACT_BEG This is continuing investigation to search for signatures of H2O, hydrated silicates, anhydrous silicates, and/or organics on the surface of additional outer Main Belt [OMB] asteroids [2.0 < a < 4.0 AU] to further analyze the distribution of these objects and to further test thermal and dynamical models for the origin and evolution of these bodies [Grimm and McSween 1993, Walsh et al. 2011]. In general, the 0.7-2.5 um region includes overtones and combinations of vibrational modes of H2O, hydrated silicates, and organics, as well as electronic transitions in anhydrous minerals, including olivine and pyroxene. The 1.4 and 1.9 um cannot be observed from the ground due to atmospheric absorptions. The 1.9-4.1 um region includes the 3-um feature, which is attributed to hydrated minerals or H2O ice. We are including the 0.7-2.5 um region, for a deeper understanding of the phyllosilicates, any anhydrous silicates, and the opaque/carbonaceous component of the surface of these asteroids. PROGRAM_ABSTRACT_END