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Discovery and designation
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| Discovered by | H. Alikoski |
| Discovery site | Turku |
| Discovery date | September 8, 1940 |
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Designations
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| MPC designation | 2180 |
| Alternate name(s) | 1940 RJ |
| Epoch May 14, 2008 | |
| Ap | 3.2627021 |
| Peri | 2.7573761 |
| Eccentricity | 0.0839401 |
| Orbital period | 1907.4652574 |
| Mean anomaly | 9.90609 |
| Inclination | 9.23277 |
| Longitude of ascending node | 233.55455 |
| Argument of peri | 85.85201 |
| Absolute magnitude (H) | 11.0 |
2180 Marjaleena (1940 RJ) is a main-belt asteroid discovered on September 8, 1940 by H. Alikoski at Turku.
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