Near Infrared Spectra of two Asteroids with low Tisserand Invariant |
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Authors: | Julie Ziffer Humberto Campins Javier Licandro Noemi Pinilla-Alonso Yanga Fernandez Schelte J. Bus |
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Affiliation: | (1) University of Central Florida, Orlando, Fl 32765, USA;(2) Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA;(3) Isaac Newton Group of Telescopes, P.O. Box 321, 38700 Santa Cruz de La Palma, La Palma, Spain;(4) Instituto de Astrofísica de Canarias, C/Vía Láctea s/n, 38200 La Laguna, Spain;(5) Fundación Galileo Galilei & Telescopio Nazionale Galileo, P.O. Box 565, 38700 S/C de La Palma, Tenerife, Spain;(6) Institute for Astronomy, University of Hawai’i, Honolulu, 96822, Hawai’i |
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Abstract: | We present near infrared reflectance spectra from 0.8 to 2.5 μm of two asteroids with low Tisserand invariant, 1373 Cincinnati and 2906 Caltech. We compare our spectra with cometary nuclei and other asteroids in their class. Asteroids Cincinnati and Caltech have Tisserand invariant values of 2.72 and 2.97, respectively, values less than 3 are considered suggestive of cometary origin. The observed spectral slopes in the near-infrared are consistent with both the spectra of cometary nuclei and of primitive asteroids. However, both asteroids have features in the near-infrared that are not seen in cometary nuclei, but are present in other X-type asteroids. 1373 Cincinnati has a sharp slope change between 0.75 and 1.0 μm and 2906 Caltech has a broad and shallow absorption between 1.35 and 2.2 μm. Our attempts to model the visible and near-infrared spectrum of these two objects, with the components successfully used by Emery and Brown (2004, Icarus 164, 104–121) to fit Trojan asteroids, did not yield acceptable fits.Visiting Astronomer at the Infrared Telescope Facility, which is operated by the University of Hawaii under contract to the National Aeronautics and Space Administration. |
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Keywords: | asteroids comets infrared spectra transition objects surface composition orbital dynamics |
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