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Discovery and designation
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| Discovered by | N. S. Chernykh |
| Discovery site | Nauchnyj |
| Discovery date | September 13, 1978 |
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Designations
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| MPC designation | 4561 |
| Named after | Sergei Lemeshev |
| Alternate name(s) | 1978 RY5 |
| Epoch May 14, 2008 | |
| Ap | 2.9771897 |
| Peri | 2.1716671 |
| Eccentricity | 0.1564469 |
| Orbital period | 1508.7582157 |
| Mean anomaly | 26.24515 |
| Inclination | 9.50724 |
| Longitude of ascending node | 10.29171 |
| Argument of peri | 54.60387 |
| Absolute magnitude (H) | 13.4 |
4561 Lemeshev (1978 RY5) is a main-belt asteroid discovered on September 13, 1978 by N. S. Chernykh at Nauchnyj. It was named for Soviet tenor Sergei Lemeshev.
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