Near Infrared Spectra of Two Asteroids with Low Tisserand Invariant

Authors

Julie Ziffer PhD, University of Southern MaineFollow
Humberto Campins PhD, University of Central FloridaFollow
Javier Licandro, Instituto de Astrofísica de CanariasFollow
Noemí Pinilla-Alonso PhD, University of Tennessee
Yanga R. Fernández PhD, University of Central FloridaFollow
Schelte J. Bus PhD, University of Hawaii

Document Type

Article

Publication Date

7-8-2006

Publication Title

Earth, Moon, and Planets

Keywords

asteroids, comets, infrared spectra, transition objects, surface composition, orbital dynamics

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.

Comments

© 2006 Springer

Recommended Citation

Ziffer, J., Campins, H., Licandro, J. et al. Near Infrared Spectra of two Asteroids with low Tisserand Invariant. Earth Moon Planet 97, 203–212 (2005). https://doi.org/10.1007/s11038-006-9083-9