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Discovery and designation
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| Discovered by | B. A. Skiff, and N. G. Thomas |
| Discovery site | Flagstaff (AM) |
| Discovery date | September 26, 1981 |
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Designations
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| MPC designation | 2557 |
| Alternate name(s) | 1981 SL1 |
| Epoch May 14, 2008 | |
| Ap | 2.7153803 |
| Peri | 1.9841319 |
| Eccentricity | 0.1556009 |
| Orbital period | 1315.6264629 |
| Mean anomaly | 136.32181 |
| Inclination | 6.05917 |
| Longitude of ascending node | 188.33390 |
| Argument of peri | 189.64739 |
| Absolute magnitude (H) | 12.5 |
2557 Putnam (1981 SL1) is a main-belt asteroid discovered on September 26, 1981 by B. A. Skiff and N. G. Thomas http://ssd.jpl.nasa.gov/sbdb.cgi at Flagstaff (AM).
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