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The asteroid 4769 Castalia (ka-stay'-lee-ə; previously known by the provisional designation 1989 PB) was the first asteroid to be modeled by radar imaging. It is an Apollo, Mars- and Venus-crosser asteroid. It was discovered on August 9, 1989 by Eleanor F. Helin on photographic plates taken at Palomar Observatory. It is named after Castalia, a nymph in Greek mythology. More information...
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