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Discovery and designation
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| Discovered by | Kosai and Hurukawa |
| Discovery site | Kiso Observatory |
| Discovery date | October 30, 1981 |
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Designations
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| MPC designation | 4072 |
| Named after | Yayoi period |
| Alternate name(s) | 1981 UJ4 |
| Epoch May 14, 2008 | |
| Ap | 2.2819605 |
| Peri | 2.0076813 |
| Eccentricity | 0.0639399 |
| Orbital period | 1147.3210961 |
| Mean anomaly | 67.35184 |
| Inclination | 2.16321 |
| Longitude of ascending node | 21.41359 |
| Argument of peri | 125.98304 |
| Absolute magnitude (H) | 13.4 |
4072 Yayoi (1981 UJ4) is a main-belt asteroid discovered on October 30, 1981 by Kosai and Hurukawa at Kiso Observatory.
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