Named in honor of Vesto Melvin Slipher {1876–1969} and E. C. Slipher {1883–1964}, graduates of Indiana University in 1901 and 1906. V. M. Slipher was a pioneer investigator of the spectra of the planets, and was the first to measure the redshifts of galaxies. E. C. Slipher developed the art of direct photography of the planets to the highest level, and his photographs are the only continuous and systematic record of the appearance of the planets for a period of more than half a century. (M 3144) _ _.