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Discovery and designation
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| Discovered by | Elst, E. W. |
| Discovery site | La Silla |
| Discovery date | September 4, 1991 |
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Designations
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| MPC designation | 7420 |
| Named after | Georges-Louis Leclerc, Comte de Buffon |
| Alternate name(s) | 1991 RP11 |
| Epoch May 14, 2008 | |
| Ap | 2.8127461 |
| Peri | 2.0663219 |
| Eccentricity | 0.1529850 |
| Orbital period | 1391.7420137 |
| Mean anomaly | 134.98505 |
| Inclination | 1.41363 |
| Longitude of ascending node | 118.39952 |
| Argument of peri | 208.11846 |
| Absolute magnitude (H) | 14.6 |
7420 Buffon (1991 RP11) is a main-belt asteroid discovered on September 4, 1991 by Elst, E. W. at La Silla.
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