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Discovery and designation
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| Discovered by | Tsutomu Seki |
| Discovery site | Geisei |
| Discovery date | February 20, 1990 |
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Designations
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| MPC designation | 4505 |
| Alternate name(s) | 1990 DV1 |
| Epoch May 14, 2008 | |
| Ap | 3.1576135 |
| Peri | 2.8616057 |
| Eccentricity | 0.0491771 |
| Orbital period | 1907.0570328 |
| Mean anomaly | 189.81026 |
| Inclination | 11.84228 |
| Longitude of ascending node | 119.21382 |
| Argument of peri | 21.80928 |
| Geometric albedo | 0.1714 |
| Absolute magnitude (H) | 11.10 |
4505 Okamura (1990 DV1) is a main-belt asteroid discovered on February 20, 1990 by Tsutomu Seki at Geisei.
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