| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
| Pallas, in astronomy |
(p l´ s) (KEY) , in astronomy, 2d asteroid to be discovered. It was found in 1802 by H. Olbers. The second largest asteroid, it has a diameter of c.300 mi (480 km). Its orbit has a semimajor axis of 2.78 astronomical units and a period of 1,684 days. |
| The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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