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| | Space Studies Board |
 | | There are other classes of asteroids, including small objects (V- and J-class) that may be fragments of Vesta's crust (Binzel and Xu, 1993), the monominerallic (olivine-rich) A-type asteroids, and the E-type asteroids (iron-poor enstatite) that probably represent mantles or crusts of such differentiated bodies. |
 | | Generally, the asteroids considered are those that are relic planetesimals formed in and beyond the asteroid belt (which is located between 2.2 and 3.2 AU from the Sun), as far away from the Sun as the Trojans, which orbit at Jupiter's distance. |
 | | The type 1 and 2 carbonaceous chondrites are the aqueously altered meteorites as represented by the CM2 Murchison and CI1 Orgueil. |
| www7.nationalacademies.org /ssb/sssbch4.html (6530 words) |
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