Pedro E. Zadunaisky
Pedro Elías Zadunaisky (December 10, 1917 – October 7, 2009) was an Argentine astronomer and mathematician who plotted the orbit of Saturn's most-distant moon, Phoebe, as well as several comets including Halley's Comet, and various satellites including Explorer I.
Zadunaisky was born in Rosario, Santa Fe. He was once a senior astronomer and a mathematician at the Smithsonian Astrophysical Observatory and at NASA's Goddard Space Flight Center. 4617 Zadunaisky is an asteroid named in his honor. He died on October 7, 2009 at the age of 91. He wrote the book "A Guide to Celestial Mechanics" in 1961.
- "Astronomy pioneer Pedro Elias Zadunaisky dies". The San Francisco Chronicle. 9 October 2009.
- Orellana, Vanessa Hand (9 October 2009). "Pedro Elias Zadunaisky, 1917-2009: Mathematician and astronomer aided U.S. in space race with Russians". Chicago Tribune. Associated Press. Archived from the original on 24 October 2012. Retrieved 12 October 2009.
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