The 3:1 mean-motion resonance of the planar elliptic restricted three body problem (Sun-Jupiter-asteroid) is considered. The double numeric averaging is used to obtain the evolutionary equations which describe the long-term behavior of the asteroid's argument of pericentre and eccentricity. The existence of the adiabatic chaos area in the system's phase space is shown. The 3:1 mean-motion reson...

Hayabusa spacecraft. Eizo Nakamura, A. Makishima, T. Moriguti, K. Kobayashi, R. Tanaka, T. Kunihiro, T. Tsujimori, C. Sakaguchi, H. Kitagawa, T. Ota, Y. Yachi, T. Yada, M. Abe, A. Fujimura, M. Ueno, T. Mukai, M. Yoshikawa, and J. Kawaguchi, The Pheasant Memorial Laboratory, Okayama University, Misasa, Tottori 682-0193, Japan ([email protected]), Japan Aerospace Exploration Agency I...

The chaotic dynamic of near earth objects and our limited knowledge on the asteroid population makes it impossible to predict the next impact of an asteroidwith our planet. The collision at Jupiter of the comet Shoemaker– Levy 9, the more recent discovery of the asteroid 99442 Apophis, and other similar events, have stimulated the discussion on our capabilities of deflecting an asteroid in coll...

1585. Lunar and Planetary Institute, Houston (CD-

There are currently only a few thousand asteroids with known classifications. Our aim is to increase this number to over 20,000 by classifying asteroids identified in the Sloan Digital Sky Suvey (SDSS) Moving Object Catalogue using an artificial neural network that has been developed using the Neural Network Toolbox in Matlab. With this neural network, we are able to provide classifications for...

Ureilites are ultramafic achondrites that exhibit heterogeneity in mg# and oxygen isotope ratios between different meteorites. Polymict ureilites represent near-surface material of the ureilite parent asteroid(s). Electron microprobe analyses of >500 olivine and pyroxene clasts in several polymict ureilites reveal a statistically identical range of compositions to that shown by unbrecciated ure...

Asteroids, because of the hazard they pose to Earth, are compelling targets for robotic and human space exploration. Yet because of their exotic low-gravity environment, simply landing on an asteroid appears to be much more challenging than we had appreciated 5 or 10 years ago. Thanks to a bold new mission from Japan that has made the first asteroid sample return attempt, this goal is now withi...

High-resolution multispectral images of main-belt asteroid 3 Juno were taken at visible and near-IR wavelengths with the 100-inch telescope at Mount Wilson Observatory equipped with an adaptive optics system. The images show spectral features that may represent a large relatively recent impact that deeply excavated the coarse-grained olivine–pyroxene-rich crust of the asteroid. © 2003 Elsevier ...