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Discovery and designation
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| Discovered by | N. S. Chernykh |
| Discovery site | Crimean Astrophysical Observatory |
| Discovery date | September 14, 1974 |
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Designations
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| MPC designation | 10991 |
| Alternate name(s) | 1974 RY1 |
| Epoch May 14, 2008 | |
| Ap | 2.8914348 |
| Peri | 1.8166724 |
| Eccentricity | 0.2282791 |
| Orbital period | 1319.2373797 |
| Mean anomaly | 136.19895 |
| Inclination | 2.73404 |
| Longitude of ascending node | 183.58520 |
| Argument of peri | 134.90819 |
| Absolute magnitude (H) | 14.4 |
10991 Dulov (1974 RY1) is a main-belt asteroid discovered on September 14, 1974 by N. S. Chernykh at the Crimean Astrophysical Observatory.
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