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Mid-Infrared Thermophysical Models of Near-Earth Asteroid 2100 Ra-Shalom

Presentation #523.03 in the session Observing and Modeling NEO Properties (iPosters).

Published onOct 20, 2022
Mid-Infrared Thermophysical Models of Near-Earth Asteroid 2100 Ra-Shalom

To better understand near-Earth asteroid 2100 Ra-Shalom’s thermophysical properties, we utilized the shape-based thermophysical model, SHERMAN [1]. This thermophysical model allows the user to derive the thermal properties in the near-infrared and thermal wavelength regions while self-consistently treating the reflected spectrum at optical wavelengths. In a previous study [2], we constrained this model with spectra (0.7- 5.1 μm) obtained at NASA’s Infrared Telescope Facility (IRTF) from August 2019-September 2019 along with delay-Doppler images and continuous wave (CW) spectra from Arecibo Observatory. We found a consistent set of parameters for all five nights of near-IR observations. They include a thermal inertia range of 500-800 J m-2 s-0.5 K-1, an albedo range of 0.13 ± 0.03, and a crater fraction of 0.30. For the current study, we test whether this thermophysical model can reproduce the observed flux in the mid-infrared. Mid-infrared data covering 8-13 μm were obtained from [3] and [4]. Preliminary results show an offset within the parameter space between the best-fitting mid-infrared models and those for the near-IR spectra. We will discuss possible explanations for this offset and explore the implications.


[1] Magri C., et al. 2018. Icarus, 303

[2] McFadden K., et al. 2021. AAS/Division for Planetary Sciences Meeting Abstracts, 53:207.06.

[3] Lim, L. F., et al. 2005. AAS/Division for Planetary Sciences Meeting Abstracts #37,37,07.10

[4] Shepard M.K., et al. 2008. Icarus, 193(1).

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