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Discovery and designation
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| Discovered by | K. Watanabe |
| Discovery site | JCPM Sapporo |
| Discovery date | July 22, 1990 |
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Designations
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| MPC designation | 4613 |
| Named after | Mamoru Mohri |
| Alternate name(s) | 1990 OM |
| Epoch May 14, 2008 | |
| Ap | 3.4704946 |
| Peri | 1.8562670 |
| Eccentricity | 0.3030411 |
| Orbital period | 1587.6263927 |
| Mean anomaly | 352.29180 |
| Inclination | 6.65275 |
| Longitude of ascending node | 145.05485 |
| Argument of peri | 255.29893 |
| Absolute magnitude (H) | 11.8 |
4613 Mamoru (1990 OM) is a main-belt asteroid discovered on July 22, 1990 by K. Watanabe at JCPM Sapporo.
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