Named in honor of Edwin S. Barker (b. 1940), a research scientist at the McDonald Observatory of the University of Texas at Austin. Barker is well known for his work on physical observations of both major and minor planets. He served as McDonald Observatory superintendent for several years in the 1980s, simultaneously continuing his planetary studies and vastly improving seeing conditions at the observatory. He also conducted an extensive atmospheric-monitoring and data-reduction program that resulted in the recommendation of locating the Hobby-Eberly Telescope on Mt. Fowlkes. In the early 1990s he very successfully served as discipline scientist at NASA headquarters, and in 1997-1998 was chair of the Division for Planetary Sciences of the American Astronomical Society. Citation written by P. J. Shelus.