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Discovery and designation
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| Discovered by | E. F. Helin |
| Discovery site | Palomar |
| Discovery date | July 19, 1987 |
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Designations
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| MPC designation | 10501 |
| Named after | Armagh |
| Alternate name(s) | 1987 OT |
| Epoch May 14, 2008 | |
| Ap | 3.4337324 |
| Peri | 2.0060872 |
| Eccentricity | 0.2624435 |
| Orbital period | 1638.4385699 |
| Mean anomaly | 242.59161 |
| Inclination | 8.69040 |
| Longitude of ascending node | 172.88074 |
| Argument of peri | 121.78892 |
| Absolute magnitude (H) | 13.5 |
10501 Ardmacha (1987 OT) is a main-belt asteroid discovered on July 19, 1987 by E. F. Helin at Palomar.
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