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Discovery and designation
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| Discovered by | S. Sposetti |
| Discovery site | Gnosca |
| Discovery date | January 2, 2000 |
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Designations
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| MPC designation | 45261 |
| Alternate name(s) | 2000 AB2 |
| Epoch May 14, 2008 | |
| Ap | 2.9433976 |
| Peri | 2.0026308 |
| Eccentricity | 0.1902065 |
| Orbital period | 1420.4905846 |
| Mean anomaly | 127.05470 |
| Inclination | 7.30345 |
| Longitude of ascending node | 116.95810 |
| Argument of peri | 259.22772 |
| Absolute magnitude (H) | 14.4 |
45261 Decoen (2000 AB2) is a main-belt asteroid discovered on January 2, 2000 by S. Sposetti at Gnosca.
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