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Discovery and designation
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| Discovered by | Kin Endate and Kazuro Watanabe |
| Discovery site | Kitami |
| Discovery date | May 16, 1990 |
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Designations
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| MPC designation | 4585 |
| Alternate name(s) | 1990 KQ |
| Epoch May 14, 2008 | |
| Ap | 3.3841052 |
| Peri | 2.0824204 |
| Eccentricity | 0.2381192 |
| Orbital period | 1650.5190126 |
| Mean anomaly | 340.90147 |
| Inclination | 10.55816 |
| Longitude of ascending node | 83.09253 |
| Argument of peri | 184.72555 |
| Absolute magnitude (H) | 12.8 |
4585 Ainonai (1990 KQ) is a main belt asteroid discovered on May 16, 1990 by Kin Endate and Kazuro Watanabe at Kitami Observatory.
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