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Discovery and designation
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| Discovered by | Vaisala, Y. |
| Discovery site | Turku |
| Discovery date | September 19, 1939 |
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Designations
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| MPC designation | 2638 |
| Alternate name(s) | 1939 SG |
| Epoch May 14, 2008 | |
| Ap | 2.7644149 |
| Peri | 2.3472971 |
| Eccentricity | 0.0816004 |
| Orbital period | 1492.4610816 |
| Mean anomaly | 248.14809 |
| Inclination | 14.36139 |
| Longitude of ascending node | 245.97355 |
| Argument of peri | 171.74735 |
| Absolute magnitude (H) | 12.1 |
2638 Gadolin (1939 SG) is a main-belt asteroid discovered on September 19, 1939 by Vaisala, Y. at Turku.
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