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Discovery and designation
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| Discovered by | T. Seki |
| Discovery site | Geisei |
| Discovery date | January 3, 1989 |
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Designations
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| MPC designation | 5815 |
| Named after | Shinsengumi |
| Alternate name(s) | 1989 AH |
| Epoch May 14, 2008 | |
| Ap | 3.3235688 |
| Peri | 3.0520680 |
| Eccentricity | 0.0425841 |
| Orbital period | 2078.9247616 |
| Mean anomaly | 282.51910 |
| Inclination | 22.87188 |
| Longitude of ascending node | 98.47508 |
| Argument of peri | 232.79781 |
| Absolute magnitude (H) | 11.8 |
5815 Shinsengumi (1989 AH) is a main-belt asteroid discovered on January 3, 1989 by T. Seki at Geisei.
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