Asteroids

accretion Acta albedo Apollo asteroid belt asteroid surfaces Astron Astrophys basaltic Bowell breccias C-type asteroids carbonaceous chondrites Ceres Chapman chapter collisional collisions cometary comets composition condensation cooling rates Cosmochim craters crossers Degewij Deimos density diameter distribution Earth Earth Planet Earth-crossing Earth-crossing asteroids eccentricity effects ejecta eucrites evolution formation fraction fragments Gaffey Gehrels Geochim Geophys gravitational groups heat Icarus impact infrared iron meteorites Jupiter Kirkwood gaps layer libration lightcurve Lunar Sci magnitude main-belt mass material melting metal mineral minor planets Morrison NASA nebula objects observations occultation olivine orbits ordinary chondrites origin Pallas parameters perturbations phase angle Phobos photometric planetary planetesimals polarimetric population pyroxene radiometric reflectance region regolith relative resonance rotation sample satellites semimajor semimajor axis silicate solar nebula solar system spectral spectrum studies Table Tedesco temperature thermal Trojans types values variations velocity Vesta Wasson wavelength Wetherill Zellner