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Discovery and designation
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| Discovered by | Spacewatch |
| Discovery site | Kitt Peak |
| Discovery date | February 9, 1999 |
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Designations
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| MPC designation | 15091 |
| Alternate name(s) | 1999 CM136 |
| Epoch May 14, 2008 | |
| Ap | 3.4827089 |
| Peri | 2.9665849 |
| Eccentricity | 0.0800280 |
| Orbital period | 2115.0549967 |
| Mean anomaly | 88.61778 |
| Inclination | 7.27900 |
| Longitude of ascending node | 305.36108 |
| Argument of peri | 315.29795 |
| Absolute magnitude (H) | 13.3 |
15091 Howell (1999 CM136) is an outer main-belt asteroid discovered on February 9, 1999 by Spacewatch at Kitt Peak.
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