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Discovery and designation
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| Discovered by | T. Kojima |
| Discovery site | Chiyoda |
| Discovery date | January 1, 1989 |
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Designations
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| MPC designation | 3998 |
| Named after | Osamu Tezuka |
| Alternate name(s) | 1989 AB |
| Epoch May 14, 2008 | |
| Ap | 2.7250701 |
| Peri | 1.8361847 |
| Eccentricity | 0.1948774 |
| Orbital period | 1257.9979843 |
| Mean anomaly | 236.50540 |
| Inclination | 6.49329 |
| Longitude of ascending node | 5.61718 |
| Argument of peri | 75.85701 |
| Absolute magnitude (H) | 12.9 |
3998 Tezuka (1989 AB) is a main-belt asteroid discovered on January 1, 1989 by T. Kojima at Chiyoda.
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