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Discovery and designation
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| Discovered by | Eric Walter Elst |
| Discovery site | La Silla |
| Discovery date | September 4, 1989 |
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Designations
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| MPC designation | 6129 |
| Named after | Democritus |
| Alternate name(s) | 1989 RB2 |
| Epoch May 14, 2008 | |
| Ap | 3.2662667 |
| Peri | 2.3184875 |
| Eccentricity | 0.1697083 |
| Orbital period | 1704.3529079 |
| Mean anomaly | 101.50428 |
| Inclination | 6.52895 |
| Longitude of ascending node | 294.14316 |
| Argument of peri | 295.39971 |
| Geometric albedo | 0.0863 |
| Absolute magnitude (H) | 12.30 |
6129 Demokritos (1989 RB2) is a main-belt asteroid discovered on September 4, 1989 by Eric Walter Elst at La Silla.
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