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Discovery and designation
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| Discovered by | Purple Mountain Observatory |
| Discovery site | Nanking |
| Discovery date | November 26, 1975 |
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Designations
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| MPC designation | 3421 |
| Named after | Chen Ning Yang |
| Alternate name(s) | 1975 WK1 |
| Epoch May 14, 2008 | |
| Ap | 2.4398937 |
| Peri | 2.0271381 |
| Eccentricity | 0.0924004 |
| Orbital period | 1219.2197806 |
| Mean anomaly | 248.42997 |
| Inclination | 2.46321 |
| Longitude of ascending node | 243.76458 |
| Argument of peri | 205.19998 |
| Absolute magnitude (H) | 13.5 |
3421 Yangchenning (1975 WK1) is a main-belt asteroid discovered on November 26, 1975 by Purple Mountain Observatory at Nanking.
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