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Discovery and designation
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| Discovered by | S. J. Bus |
| Discovery site | Siding Spring Observatory |
| Discovery date | March 2, 1981 |
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Designations
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| MPC designation | 7861 |
| Alternate name(s) | 1981 EK25 |
| Epoch May 14, 2008 | |
| Ap | 2.8631041 |
| Peri | 2.0112527 |
| Eccentricity | 0.1747618 |
| Orbital period | 1389.7266925 |
| Mean anomaly | 314.86007 |
| Inclination | 1.95699 |
| Longitude of ascending node | 309.18841 |
| Argument of peri | 345.06129 |
| Absolute magnitude (H) | 14.6 |
7861 Messenger (1981 EK25) is a main-belt asteroid discovered on March 2, 1981 by S. J. Bus at Siding Spring Observatory in the course of the U.K. Schmidt-Caltech Asteroid Survey.
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