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Discovery and designation
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| Discovered by | Y. Vaisala |
| Discovery site | Turku |
| Discovery date | October 7, 1939 |
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Designations
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| MPC designation | 2972 |
| Alternate name(s) | 1939 TB |
| Epoch May 14, 2008 | |
| Ap | 2.5164233 |
| Peri | 1.7861873 |
| Eccentricity | 0.1697193 |
| Orbital period | 1152.5279869 |
| Mean anomaly | 291.55585 |
| Inclination | 1.09403 |
| Longitude of ascending node | 204.42779 |
| Argument of peri | 139.14640 |
| Absolute magnitude (H) | 13.9 |
2972 Niilo (1939 TB) is a main-belt asteroid discovered on October 7, 1939 by Y. Vaisala at Turku.
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