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Discovery and designation
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| Discovered by | Iwamoto and Furuta |
| Discovery site | Tokushima |
| Discovery date | February 10, 1989 |
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Designations
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| MPC designation | 5581 |
| Alternate name(s) | 1989 CY1 |
| Epoch May 14, 2008 | |
| Ap | 2.7589084 |
| Peri | 2.0031062 |
| Eccentricity | 0.1587148 |
| Orbital period | 1341.9597988 |
| Mean anomaly | 41.19457 |
| Inclination | 2.48202 |
| Longitude of ascending node | 165.58165 |
| Argument of peri | 35.68060 |
| Absolute magnitude (H) | 13.9 |
5581 Mitsuko (1989 CY1) is a main-belt asteroid discovered on February 10, 1989 by Iwamoto and Furuta at Tokushima.
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