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Discovery and designation
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| Discovered by | R. M. West |
| Discovery site | La Silla |
| Discovery date | March 12, 1986 |
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Designations
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| MPC designation | 3933 |
| Named after | Portugal |
| Alternate name(s) | 1986 EN4 |
| Epoch May 14, 2008 | |
| Ap | 3.5625474 |
| Peri | 2.9338198 |
| Eccentricity | 0.0967814 |
| Orbital period | 2138.2539149 |
| Mean anomaly | 184.80898 |
| Inclination | 1.70393 |
| Longitude of ascending node | 43.38782 |
| Argument of peri | 242.74515 |
| Absolute magnitude (H) | 12.4 |
3933 Portugal (1986 EN4) is an outer main-belt asteroid discovered on March 12, 1986 by R. M. West at La Silla.
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