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Discovery and designation
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| Discovery site | Purple Mountain Observatory |
| Discovery date | 26 September 1979 |
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Designations
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| MPC designation | 3443 |
| Named after | Tsung-Dao Lee |
| Alternate name(s) | 1979 SB1 |
| Epoch May 14, 2008 | |
| Ap | 3.1264803 |
| Peri | 1.6569081 |
| Eccentricity | 0.3072241 |
| Orbital period | 1351.0048267 |
| Mean anomaly | 306.68382 |
| Inclination | 12.68656 |
| Longitude of ascending node | 184.92232 |
| Argument of peri | 111.69633 |
| Absolute magnitude (H) | 13.3 |
3443 Leetsungdao (1979 SB1) is a Mars-crossing asteroid discovered on 26 September 1979 at the Purple Mountain Observatory.
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