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Discovery and designation
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| Discovered by | C. S. Shoemaker and E. M. Shoemaker |
| Discovery site | Palomar |
| Discovery date | September 28, 1984 |
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Designations
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| MPC designation | 24643 |
| Named after | Paul MacCready |
| Alternate name(s) | 1984 SS |
| Epoch May 14, 2008 | |
| Ap | 3.0069224 |
| Peri | 1.6359446 |
| Eccentricity | 0.2952869 |
| Orbital period | 1291.9115392 |
| Mean anomaly | 258.41075 |
| Inclination | 23.30778 |
| Longitude of ascending node | 220.01521 |
| Argument of peri | 114.25953 |
| Absolute magnitude (H) | 14.1 |
24643 MacCready (1984 SS) is a Mars-crossing asteroid discovered on September 28, 1984 by C. S. Shoemaker and E. M. Shoemaker at Palomar.
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