The Allende meteorite is the largest carbonaceous chondrite ever found on Earth. The bolide was witnessed on February 8, 1969; falling over the state of Chihuahua, Mexico. The Allende meteorite is notable for possessing many, large calcium-aluminium rich inclusions (CAIs), which are among the oldest objects formed in our solar system.
Some portion of the carbonaceous chondrites are thought to originate from 1 Ceres. While no meteorites have conclusively come from Ceres, it is possible that the reflectance spectrum of the surface of Ceres is not indicative of its crustal rocks.
The present models assume instantaneous cold accretion of Ceres from approximately 1-km-sized objects. These may have accreted earlier from solar nebula during a duration period of about 2.4 million years from nebula cooling and formation of CAIs. This means that Ceres may have evolved further from the simple aqueous thermal evolution found in CC meteorites.
Allende
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