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Discovery and designation
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| Discovered by | E. F. Helin |
| Discovery site | Palomar |
| Discovery date | June 19, 1988 |
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Designations
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| MPC designation | 5431 |
| Alternate name(s) | 1988 MB |
| Epoch May 14, 2008 | |
| Ap | 2.9194027 |
| Peri | 1.7350379 |
| Eccentricity | 0.2544591 |
| Orbital period | 1296.7452810 |
| Mean anomaly | 153.95782 |
| Inclination | 23.30587 |
| Longitude of ascending node | 287.73764 |
| Argument of peri | 100.86660 |
| Absolute magnitude (H) | 13.0 |
5431 Maxinehelin (1988 MB) is a main-belt asteroid discovered on June 19, 1988 by E. F. Helin at Palomar.
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