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Discovery and designation
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| Discovered by | Roman, B. |
| Discovery site | Palomar |
| Discovery date | September 22, 1990 |
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Designations
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| MPC designation | 5186 |
| Alternate name(s) | 1990 SB4 |
| Epoch May 14, 2008 | |
| Ap | 2.7961094 |
| Peri | 2.3615850 |
| Eccentricity | 0.0842478 |
| Orbital period | 1512.6444470 |
| Mean anomaly | 61.30080 |
| Inclination | 14.90297 |
| Longitude of ascending node | 333.93142 |
| Argument of peri | 75.78763 |
| Absolute magnitude (H) | 11.8 |
5186 Donalu (1990 SB4) is a main-belt asteroid discovered on September 22, 1990 by Roman, B. at Palomar.
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