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Discovery and designation
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| Discovered by | Marguerite Laugier |
| Discovery site | Nice |
| Discovery date | September 28, 1949 |
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Designations
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| MPC designation | 4909 |
| Alternate name(s) | 1949 SA1 |
| Epoch May 14, 2008 | |
| Ap | 2.8335019 |
| Peri | 1.7132441 |
| Eccentricity | 0.2463867 |
| Orbital period | 1252.0004184 |
| Mean anomaly | 52.38308 |
| Inclination | 2.40917 |
| Longitude of ascending node | 114.18558 |
| Argument of peri | 234.76934 |
| Absolute magnitude (H) | 13.7 |
4909 Couteau (1949 SA1) is a main-belt asteroid discovered on September 28, 1949 by Marguerite Laugier at Nice.
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