Orbits, distribution, and delivery

The orbits of asteroids in the main belt between Mars and Jupiter show gaps in both heliocentric distance and inclination (degrees from the ecliptic, the plane in which the planets 

Heliocentric distribution of asteroid spectral types in the main belt, (a) (modified from Gradie and Tedesco, 1982) and (b) (modified from Mothe-Diniz et al., 2003) show distributions using two different asteroid taxonomies, explained in the text. Petrologic interpretations of the various spectral classes are shown in (a). 

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