21656 Knuth
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| Discovery and designation | |
|---|---|
| Discovered by | P. Pravec and P. Kušnirák |
| Discovery site | Ondřejov |
| Discovery date | August 9, 1999 |
| Designations | |
| MPC designation | 21656 |
| Named after | Donald Knuth |
| Alternative names | 1999 PX1 |
| Orbital characteristics | |
| Epoch May 14, 2008 | |
| Aphelion | 3.3200848 |
| Perihelion | 2.1000056 |
| Eccentricity | 0.2251031 |
| Orbital period | 1629.5332994 |
| Mean anomaly | 348.73309 |
| Inclination | 9.25301 |
| Longitude of ascending node | 130.32996 |
| Argument of perihelion | 204.04123 |
| Physical characteristics | |
| Absolute magnitude (H) | 14.7 |
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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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