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Discovery and designation
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| Discovered by | S. J. Bus |
| Discovery site | Siding Spring Observatory |
| Discovery date | March 1, 1981 |
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Designations
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| MPC designation | 7157 |
| Alternate name(s) | 1981 EC8 |
| Epoch May 14, 2008 | |
| Ap | 2.6995467 |
| Peri | 1.7008143 |
| Eccentricity | 0.2269660 |
| Orbital period | 1192.0264556 |
| Mean anomaly | 324.46353 |
| Inclination | 4.13801 |
| Longitude of ascending node | 237.69335 |
| Argument of peri | 100.00292 |
| Absolute magnitude (H) | 14.6 |
7157 Lofgren (1981 EC8) is a main-belt asteroid discovered on March 1, 1981 by S. J. Bus at Siding Spring Observatory in the course of the U.K. Schmidt-Caltech Asteroid Survey.
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