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Discovery and designation
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| Discovered by | Kosai and Hurukawa |
| Discovery site | Kiso Observatory |
| Discovery date | February 19, 1977 |
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Designations
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| MPC designation | 5018 |
| Named after | Emperor Temmu |
| Alternate name(s) | 1977 DY8 |
| Epoch May 14, 2008 | |
| Ap | 2.2866203 |
| Peri | 2.0305919 |
| Eccentricity | 0.0593041 |
| Orbital period | 1158.3998906 |
| Mean anomaly | 69.13107 |
| Inclination | 3.40855 |
| Longitude of ascending node | 30.75515 |
| Argument of peri | 352.89468 |
| Absolute magnitude (H) | 14.3 |
5018 Tenmu (1977 DY8) is a main-belt asteroid discovered on February 19, 1977 by Kosai and Hurukawa at Kiso Observatory.
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