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Discovery and designation
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| Discovered by | H. Alikoski |
| Discovery site | Turku |
| Discovery date | August 18, 1939 |
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Designations
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| MPC designation | 2257 |
| Alternate name(s) | 1939 QB |
| Epoch May 14, 2008 | |
| Ap | 3.0817825 |
| Peri | 1.8932971 |
| Eccentricity | 0.2388877 |
| Orbital period | 1433.0240960 |
| Mean anomaly | 167.26475 |
| Inclination | 5.05727 |
| Longitude of ascending node | 234.04396 |
| Argument of peri | 128.41204 |
| Absolute magnitude (H) | 12.9 |
2257 Kaarina (1939 QB) is a main-belt asteroid discovered on August 18, 1939 by H. Alikoski at Turku.
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