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Discovery and designation
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| Discovered by | L. G. Karachkina |
| Discovery site | Crimean Astrophysical Observatory |
| Discovery date | September 1, 1987 |
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Designations
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| MPC designation | 4258 |
| Alternate name(s) | 1987 RZ2 |
| Epoch May 14, 2008 | |
| Ap | 3.1570379 |
| Peri | 2.7599799 |
| Eccentricity | 0.0671044 |
| Orbital period | 1858.6933541 |
| Mean anomaly | 34.02680 |
| Inclination | 3.95723 |
| Longitude of ascending node | 62.46861 |
| Argument of peri | 272.19318 |
| Absolute magnitude (H) | 12.0 |
4258 Ryazanov (1987 RZ2) is a main-belt asteroid discovered on September 1, 1987 by L. G. Karachkina at Crimean Astrophysical Observatory.
The asteroid is named after the Russian film director Eldar Ryazanov.
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