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Discovery and designation
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| Discovered by | Spacewatch |
| Discovery site | Kitt Peak |
| Discovery date | December 22, 1998 |
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Designations
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| MPC designation | 15058 |
| Alternate name(s) | 1998 YL16 |
| Epoch May 14, 2008 | |
| Ap | 3.6104337 |
| Peri | 2.5604873 |
| Eccentricity | 0.1701442 |
| Orbital period | 1979.6044651 |
| Mean anomaly | 316.02207 |
| Inclination | 5.83415 |
| Longitude of ascending node | 124.07460 |
| Argument of peri | 282.48229 |
| Absolute magnitude (H) | 13.1 |
15058 Billcooke (1998 YL16) is a main-belt asteroid discovered on December 22, 1998 by Spacewatch at Kitt Peak.
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