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Discovery and designation
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| Discovered by | L. D. Schmadel |
| Discovery site | European Southern Observatory |
| Discovery date | September 5, 1977 |
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Designations
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| MPC designation | 52228 |
| Alternate name(s) | 1977 RN |
| Epoch May 14, 2008 | |
| Ap | 3.5896889 |
| Peri | 2.8312817 |
| Eccentricity | 0.1181141 |
| Orbital period | 2101.1374332 |
| Mean anomaly | 86.02689 |
| Inclination | 27.93324 |
| Longitude of ascending node | 48.40241 |
| Argument of peri | 332.49390 |
| Absolute magnitude (H) | 13.0 |
52228 Protos (1977 RN) is an outer main-belt asteroid discovered on September 5, 1977 by L. D. Schmadel at the European Southern Observatory.
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