Near infrared spectra of two asteroids with low Tisserand invariant

    Authors

    J. Ziffer; H. Campins; Y. Fernandez; H. Campins; J. Licandro; N. Pinilla-Alonso; S. J. Bus;Y. Fernandez

    Comments

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    Abbreviated Journal Title

    Earth Moon Planets

    Keywords

    asteroids; comets; infrared spectra; transition objects; surface; composition; orbital dynamics; SURFACE-COMPOSITION; TROJAN ASTEROIDS; MAIN-BELT; SPECTROSCOPY; REFLECTANCE; SPECTROGRAPH; CONSTRAINTS; TAXONOMY; NUCLEUS; ALBEDO; Astronomy & Astrophysics; Geosciences, Multidisciplinary

    Abstract

    We present near infrared reflectance spectra from 0.8 to 2.5 mu m 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 mu m and 2906 Caltech has a broad and shallow absorption between 1.35 and 2.2 mu m. 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.

    Journal Title

    Earth Moon and Planets

    Volume

    97

    Issue/Number

    3-4

    Publication Date

    1-1-2005

    Document Type

    Article; Proceedings Paper

    Language

    English

    First Page

    203

    Last Page

    212

    WOS Identifier

    WOS:000241128100004

    ISSN

    0167-9295

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