|Discovery and designation|
|Discovered by||P. Pravec and P. Kušnirák|
|Discovery date||August 9, 1999|
|Epoch May 14, 2008|
21656 Knuth (1999 PX1) is a main-belt asteroid discovered on August 9, 1999 by P. Pravec and P. Kušnirák at the Ondřejov Observatory. It is named after Donald Knuth, a renowned computer scientist and mathematician, Professor Emeritus at Stanford University.
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