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Discovery and designation
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| Discovered by | L. G. Karachkina |
| Discovery site | Nauchnyj |
| Discovery date | September 7, 1981 |
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Designations
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| MPC designation | 3620 |
| Named after | Andrei Platonov |
| Alternate name(s) | 1981 RU2 |
| Epoch May 14, 2008 | |
| Ap | 3.3170466 |
| Peri | 2.6686470 |
| Eccentricity | 0.1083249 |
| Orbital period | 1891.1464508 |
| Mean anomaly | 30.40775 |
| Inclination | 8.96832 |
| Longitude of ascending node | 272.45280 |
| Argument of peri | 126.40379 |
| Absolute magnitude (H) | 12.2 |
3620 Platonov (1981 RU2) is a main-belt asteroid discovered on September 7, 1981 by L. G. Karachkina at Nauchnyj and named for Soviet writer Andrei Platonov.
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