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Discovery and designation
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| Discovered by | L. V. Zhuravleva |
| Discovery site | Nauchnyj |
| Discovery date | September 25, 1973 |
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Designations
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| MPC designation | 4811 |
| Named after | Nikolai Semashko |
| Alternate name(s) | 1973 SO3 |
| Epoch May 14, 2008 | |
| Ap | 2.6575715 |
| Peri | 1.8361505 |
| Eccentricity | 0.1827930 |
| Orbital period | 1230.1631914 |
| Mean anomaly | 160.55816 |
| Inclination | 5.05915 |
| Longitude of ascending node | 9.07161 |
| Argument of peri | 275.32084 |
| Absolute magnitude (H) | 14.3 |
4811 Semashko (1973 SO3) is a main-belt asteroid discovered on September 25, 1973 by L. V. Zhuravleva at Nauchnyj.
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