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Discovery and designation
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| Discovered by | M. Mukai and M. Takeishi |
| Discovery site | Kagoshima |
| Discovery date | October 21, 1989 |
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Designations
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| MPC designation | 5640 |
| Alternate name(s) | 1989 UR3 |
| Epoch May 14, 2008 | |
| Ap | 3.3173739 |
| Peri | 1.9763997 |
| Eccentricity | 0.2533116 |
| Orbital period | 1572.9012876 |
| Mean anomaly | 143.67279 |
| Inclination | 3.12648 |
| Longitude of ascending node | 166.78408 |
| Argument of peri | 173.65555 |
| Absolute magnitude (H) | 13.4 |
5640 Yoshino (1989 UR3) is a main-belt asteroid discovered on October 21, 1989 by M. Mukai and M. Takeishi at Kagoshima.
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