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Discovery and designation
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| Discovered by | Lincoln Laboratory Near-Earth Asteroid Research Team |
| Discovery site | Socorro |
| Discovery date | September 9, 1999 |
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Designations
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| MPC designation | 22856 |
| Alternate name(s) | 1999 RX142 |
| Epoch May 14, 2008 | |
| Ap | 2.6999683 |
| Peri | 2.3951805 |
| Eccentricity | 0.0598192 |
| Orbital period | 1485.2129721 |
| Mean anomaly | 342.46381 |
| Inclination | 4.00032 |
| Longitude of ascending node | 2.17226 |
| Argument of peri | 68.41061 |
| Absolute magnitude (H) | 16.1 |
22856 Stevenzeiher (1999 RX142) is a main-belt asteroid discovered on September 9, 1999 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
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