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Discovery and designation
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| Discovered by | Y. Oshima |
| Discovery site | Gekko |
| Discovery date | October 23, 1989 |
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Designations
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| MPC designation | 4840 |
| Alternate name(s) | 1989 UY |
| Epoch May 14, 2008 | |
| Ap | 3.5047358 |
| Peri | 2.8603100 |
| Eccentricity | 0.1012445 |
| Orbital period | 2073.7468146 |
| Mean anomaly | 64.72411 |
| Inclination | 15.16121 |
| Longitude of ascending node | 247.55352 |
| Argument of peri | 197.04563 |
| Geometric albedo | 0.0398 |
| Absolute magnitude (H) | 11.90 |
4840 Otaynang (1989 UY) is a main-belt asteroid discovered on October 23, 1989 by Y. Oshima at Gekko.
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