Thermal Infrared Spectrophotometry of the Near-Earth Asteroids 2100 Ra-Shalom and 1991 EE

Details Thermal Infrared Spectrophotometry of the Near-Earth Asteroids 2100 Ra-Shalom and 1991 EE Thermal Infrared Spectrophotometry of the Near-Earth Asteroids 2100 Ra-Shalom and 1991 EE

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998icar..135..441h&link_type=abstract

Icarus, Volume 135, Issue 2, pp. 441-450.

Physics

34

Scientific paper

Thermal infrared observations of the near-Earth asteroids 2100 Ra-Shalom and 1991 EE are presented and interpreted with the aid of published asteroid thermal models. The broad wavelength range covered allows the best fitting of a family of model spectra to be selected, eliminating the ambiguity associated with deriving model parameters from observations at just one or two thermal wavelengths. Neither the ``standard'' thermal model nor the ``fast rotating'' model provide good fits to the thermal spectra. Much improved fits are obtained with a modified standard thermal model with values of the model ``beaming'' parameter, epsilon, significantly higher than normally assumed in the standard thermal model. The results for the Aten asteroid 2100 Ra-Shalom provide convincing confirmation that this object has an unusually high surface thermal inertia. The resulting optical albedos (on the H, G magnitude system) and effective diameters are 0.13 +/- 0.04 and 2.48 +/- 0.35 km for 2100 Ra-Shalom (near lightcurve maximum) and 0.30 +/- 0.10 and 1.01 +/- 0.15 km for 1991 EE (referred to the lightcurve mean magnitude). The derived size for 2100 Ra-Shalom is consistent with previous estimates but the moderate albedo, coupled with infrared colors more typical of S-types, leads us to question its classification as C-type. These are the first size and albedo determinations for the Apollo asteroid 1991 EE. The near infrared colors and albedo of 1991 EE suggest an S-type classification.

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