(21647) Carlturner = 1999 NE54 Carl Anthony Turner (b. 1989) was awarded first place in the 2006 Intel International Science and Engineering Fair for his engineering project. He attends the New Prague Senior High School, New Prague, Minnesota, U.S.A.
A complete set of naming citations of the numbered minor planets is available in the Dictionary of Minor Planet Names, edited by Lutz Schmadel.