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Discovery and designation
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| Discovered by | Niijima, T. and Urata, T. |
| Discovery site | Ojima |
| Discovery date | March 3, 1987 |
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Designations
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| MPC designation | 3686 |
| Named after | Emperor Antoku |
| Alternate name(s) | 1987 EB |
| Epoch May 14, 2008 | |
| Ap | 3.1484618 |
| Peri | 2.3285060 |
| Eccentricity | 0.1497098 |
| Orbital period | 1655.2504198 |
| Mean anomaly | 192.22454 |
| Inclination | 5.71315 |
| Longitude of ascending node | 134.77407 |
| Argument of peri | 78.65619 |
| Geometric albedo | 0.0680 |
| Absolute magnitude (H) | 12.40 |
3686 Antoku (1987 EB) is a main-belt asteroid discovered on March 3, 1987 by Niijima, T. and Urata, T. at Ojima.
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