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Discovery and designation
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| Discovered by | Kin Endate and Kazuro Watanabe |
| Discovery site | Kitami |
| Discovery date | September 7, 1988 |
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Designations
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| MPC designation | 4491 |
| Alternate name(s) | 1988 RP |
| Epoch May 14, 2008 | |
| Ap | 2.2356879 |
| Peri | 2.1111213 |
| Eccentricity | 0.0286570 |
| Orbital period | 1170.3326144 |
| Mean anomaly | 17.52372 |
| Inclination | 3.67505 |
| Longitude of ascending node | 313.71902 |
| Argument of peri | 72.57807 |
| Absolute magnitude (H) | 13.1 |
4491 Otaru (1988 RP) is a main-belt asteroid discovered on September 7, 1988 by Kin Endate and Kazuro Watanabe at Kitami.
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