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Discovery and designation
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| Discovered by | Shoemaker, C. and Shoemaker, E. |
| Discovery site | Palomar |
| Discovery date | April 23, 1985 |
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Designations
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| MPC designation | 3581 |
| Alternate name(s) | 1985 HC |
| Epoch May 14, 2008 | |
| Ap | 3.9051266 |
| Peri | 1.6362094 |
| Eccentricity | 0.4094531 |
| Orbital period | 1684.5160640 |
| Mean anomaly | 305.98422 |
| Inclination | 28.81275 |
| Longitude of ascending node | 217.76120 |
| Argument of peri | 107.20702 |
| Absolute magnitude (H) | 12.1 |
3581 Alvarez (1985 HC) is a Mars-crossing asteroid discovered on April 23, 1985 by Shoemaker, C. and Shoemaker, E. at Palomar.
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