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Discovery and designation
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| Discovered by | Robert H. McNaught |
| Discovery site | Siding Spring |
| Discovery date | February 22, 1988 |
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Designations
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| MPC designation | 4129 |
| Alternate name(s) | 1988 DM |
| Epoch May 14, 2008 | |
| Ap | 3.2107310 |
| Peri | 1.9199062 |
| Eccentricity | 0.2515915 |
| Orbital period | 1500.7570694 |
| Mean anomaly | 183.45869 |
| Inclination | 7.11475 |
| Longitude of ascending node | 245.47054 |
| Argument of peri | 71.10443 |
| Absolute magnitude (H) | 13.5 |
4129 Richelen (1988 DM) is a main-belt asteroid discovered on February 22, 1988 by Robert H. McNaught at Siding Spring.
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