|
Discovery and designation
|
|
|---|---|
| Discovered by | Lincoln Laboratory Near-Earth Asteroid Research Team |
| Discovery site | Socorro |
| Discovery date | May 20, 1999 |
|
Designations
|
|
| MPC designation | 21621 |
| Alternate name(s) | 1999 KR4 |
| Epoch May 14, 2008 | |
| Ap | 3.0177482 |
| Peri | 1.7734850 |
| Eccentricity | 0.2596958 |
| Orbital period | 1354.3297074 |
| Mean anomaly | 131.26305 |
| Inclination | 8.69722 |
| Longitude of ascending node | 209.45792 |
| Argument of peri | 114.63589 |
| Absolute magnitude (H) | 14.5 |
21621 Sherman (1999 KR4) is a main-belt asteroid discovered on May 20, 1999 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.