The Global Thermal Infrared Spectrum of Bennu: Comparison with Spitzer IRS Asteroid Spectra

The OSIRIS-REx Thermal Emission Spectrometer (OTES) will measure thermal emission from (101955) Bennu over the wavelength range from 5.5 μm to more than 50 μm [Christensen et al., this meeting]. During the Approach mission phase, disk-integrated OTES spectra of Bennu will be collected [Hamilton et al., this meeting]. We will place these rotationally resolved spectra in the context of emissivity spectra of other asteroids and small bodies observed with the Spitzer IRS (5-35 μm; e.g. Emery et al. 2006, Barucci et al. 2008, Lim et al. 2011, Licandro et al. 2011, 2012, Hargrove et al. 2015, Kelley et al. 2017) representing a range of sizes, VNIR spectral classes, and dynamical classes.

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