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Discovery and designation
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| Discovered by | J. Broughton |
| Discovery site | Reedy Creek Observatory |
| Discovery date | March 15, 1999 |
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Designations
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| MPC designation | 17024 |
| Alternate name(s) | 1999 EJ5 |
| Epoch May 14, 2008 | |
| Ap | 2.5934806 |
| Peri | 2.2702092 |
| Eccentricity | 0.0664663 |
| Orbital period | 1385.1673205 |
| Mean anomaly | 66.02044 |
| Inclination | 5.34252 |
| Longitude of ascending node | 327.45129 |
| Argument of peri | 313.35005 |
| Absolute magnitude (H) | 14.9 |
17024 Costello (1999 EJ5) is a main-belt asteroid discovered on March 15, 1999 by J. Broughton at Reedy Creek Observatory.
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