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Discovery and designation
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| Discovered by | H. Debehogne |
| Discovery site | European Southern Observatory |
| Discovery date | September 5, 1985 |
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Designations
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| MPC designation | 3456 |
| Named after | Étienne-Jules Marey |
| Alternate name(s) | 1985 RS2 |
| Epoch May 14, 2008 | |
| Ap | 2.1969440 |
| Peri | 2.1306352 |
| Eccentricity | 0.0153224 |
| Orbital period | 1162.5749679 |
| Mean anomaly | 132.76952 |
| Inclination | 1.77954 |
| Longitude of ascending node | 78.37794 |
| Argument of peri | 163.84400 |
| Absolute magnitude (H) | 13.7 |
3456 Etiennemarey (1985 RS2) is a main-belt asteroid discovered on September 5, 1985 by H. Debehogne at the European Southern Observatory.
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