Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The asteroid 4769 Castalia 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. Castalia's orbit took it within eleven lunar distances of Earth, allowing it to be observed with radar from the Arecibo Observatory by Scott Hudson and Steven J. Ostro.
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