J, H, K photometry of 433 Eros and other asteroids |
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| Authors: | Clark R Chapman David Morrison |
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| Institution: | Planetary Science Institute, 2030 E. Speedway, Tucson, Arizona 85719, USA;Lunar and Planetary Laboratory, University of Arizona, Tucson, Arizona 85721, USA |
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| Abstract: | We report photometry for nine asteroids at wavelengths of 1.25, 1.65, and 2.22 μm. Three C-type objects (88, 129, and 511) seem slightly redder in H?K and J?H color indices than four S-type objects (5, 6, 7, and 116) and an E-type object (64). Eros has an unusually red J?H color index; its infrared spectral reflectance is consistent with an appreciable quantity of metallic iron plus some pyroxene and olivine on its surface. JHK photometry is less diagnostic of composition than either higher resolution spectrophotometry in the infrared or spectrophotometry at shorter wavelengths. |
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