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Discovery and designation
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| Discovered by | E. Bowell |
| Discovery site | Flagstaff (AM) |
| Discovery date | August 3, 1981 |
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Designations
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| MPC designation | 3690 |
| Alternate name(s) | 1981 PM |
| Epoch May 14, 2008 | |
| Ap | 2.6170997 |
| Peri | 1.8734891 |
| Eccentricity | 0.1655931 |
| Orbital period | 1228.8768864 |
| Mean anomaly | 19.39281 |
| Inclination | 5.03315 |
| Longitude of ascending node | 235.34800 |
| Argument of peri | 34.98317 |
| Absolute magnitude (H) | 13.8 |
3690 Larson (1981 PM) is a main-belt asteroid discovered on August 3, 1981 by E. Bowell at Flagstaff (AM).
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