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Asteroid 9564 Jeffwynn is a Mars-crossing Phocaea-group asteroid that is 5-12 kilometers in diameter, depending on its albedo. It has an inherent magnitude of 13.8 and an orbital period of roughly 6 years. The asteroid name was chosen by Caroline Shoemaker, who wrote the following citation, reported in the Minor Planet Circulars, 1999 November:

(9564) Jeffwynn = 1987 SG3
Discovered 1987 Sept. 26 by Carolyn S. Shoemaker and Eugene M. Shoemaker at Palomar.
Jeffrey C. Wynn, a humorous, curious, inventive, adventurous geophysicist with the U.S. Geological Survey has studied the Wabar Craters of Saudi Arabia with Gene Shoemaker, mapped the seafloor, analyzed mineral resources on land, studied aquifers and archeological sites - and observed with the Shoemaker-Levy team.

Harvard University's Minor Planet Ephemeris Service will provide exact current location information for the Mars-crossing Phocaea-group asteroid 9564 Jeffwynn. Simply enter "09564" in object designation box and click on "Get ephemerides/HTML page."

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