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Discovery and designation
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| Discovered by | Eric Walter Elst |
| Discovery site | La Silla, Chile |
| Discovery date | July 20, 1993 |
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Designations
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| MPC designation | 8191 |
| Named after | Marin Mersenne |
| Alternate name(s) | 1993 OX9 |
| Epoch May 14, 2008 | |
| Ap | 2.5120864 |
| Peri | 2.0149410 |
| Eccentricity | 0.1098172 |
| Orbital period | 1243.8646377 |
| Mean anomaly | 20.91285 |
| Inclination | 2.82986 |
| Longitude of ascending node | 302.71526 |
| Argument of peri | 110.22582 |
| Absolute magnitude (H) | 14.4 |
8191 Mersenne (1993 OX9) is an asteroid discovered 1993 July 20 by Eric Walter Elst at La Silla Observatory, according to http://www.angelfire.com/id/ericelst/Citapla.html. It was named after Marin Mersenne because 8191, the number of the object discovered, is sequentially the fifth Mersenne prime.
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