2 Pallas is the second asteroid to have been discovered, by astronomer Heinrich Wilhelm Matthäus Olbers on March 28, 1802. Pallas was at first considered a planet, as were the other early asteroids 1 Ceres, 3 Juno, and 4 Vesta, until the discovery of many additional asteroids led to their re-classification. It appears to be the largest irregularly shaped body in the Solar System, not completely rounded under its own gravity.
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