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Discovery and designation
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| Discovered by | Y. Vaisala |
| Discovery site | Turku |
| Discovery date | September 8, 1942 |
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Designations
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| MPC designation | 3897 |
| Alternate name(s) | 1942 RT |
| Epoch May 14, 2008 | |
| Ap | 3.1208309 |
| Peri | 2.2675789 |
| Eccentricity | 0.1583495 |
| Orbital period | 1615.2671461 |
| Mean anomaly | 314.32494 |
| Inclination | 7.07570 |
| Longitude of ascending node | 189.06038 |
| Argument of peri | 147.58033 |
| Absolute magnitude (H) | 12.7 |
3897 Louhi (1942 RT) is a main-belt asteroid discovered on September 8, 1942 by Y. Vaisala at Turku.
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