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Discovery and designation
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| Discovered by | C. S. Shoemaker |
| Discovery site | Palomar Observatory |
| Discovery date | May 13, 1985 |
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Designations
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| MPC designation | 4085 |
| Alternate name(s) | 1985 JR |
| Epoch May 14, 2008 | |
| Ap | 2.8898517 |
| Peri | 2.3198119 |
| Eccentricity | 0.1094197 |
| Orbital period | 1535.5641127 |
| Mean anomaly | 185.99086 |
| Inclination | 14.22905 |
| Longitude of ascending node | 68.74424 |
| Argument of peri | 135.59280 |
| Absolute magnitude (H) | 12.3 |
4085 Weir (1985 JR) is a main-belt asteroid discovered on May 13, 1985 by C. S. Shoemaker at Palomar Observatory.
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