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Discovery and designation
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| Discovered by | Lincoln Laboratory Near-Earth Asteroid Research Team |
| Discovery site | Socorro |
| Discovery date | September 26, 1998 |
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Designations
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| MPC designation | 15021 |
| Alternate name(s) | 1998 SX123 |
| Epoch May 14, 2008 | |
| Ap | 2.7790954 |
| Peri | 1.9292144 |
| Eccentricity | 0.1805066 |
| Orbital period | 1319.3225191 |
| Mean anomaly | 204.99318 |
| Inclination | 2.64628 |
| Longitude of ascending node | 38.95729 |
| Argument of peri | 25.21117 |
| Absolute magnitude (H) | 15.2 |
15021 Alexkardon (1998 SX123) is a main-belt asteroid discovered on September 26, 1998 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
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