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Discovery and designation
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| Discovered by | Seiji Ueda and Hiroshi Kaneda |
| Discovery site | Kushiro |
| Discovery date | December 9, 1991 |
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Designations
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| MPC designation | 5070 |
| Named after | Arai Ikunosuke |
| Alternate name(s) | 1991 XT |
| Epoch May 14, 2008 | |
| Ap | 3.3291990 |
| Peri | 2.8817082 |
| Eccentricity | 0.0720492 |
| Orbital period | 1998.8766313 |
| Mean anomaly | 304.39931 |
| Inclination | 6.03383 |
| Longitude of ascending node | 340.25271 |
| Argument of peri | 189.38465 |
| Geometric albedo | 0.0792 |
| Absolute magnitude (H) | 11.10 |
5070 Arai (1991 XT) is a main-belt asteroid discovered on December 9, 1991 by Seiji Ueda and Hiroshi Kaneda at Kushiro.
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