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Discovery and designation
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| Discovered by | L. I. Chernykh |
| Discovery site | Nauchnyj |
| Discovery date | September 3, 1987 |
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Designations
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| MPC designation | 4449 |
| Named after | Leonid Sobinov |
| Alternate name(s) | 1987 RX3 |
| Epoch May 14, 2008 | |
| Ap | 3.4326689 |
| Peri | 2.8562769 |
| Eccentricity | 0.0916516 |
| Orbital period | 2036.6679434 |
| Mean anomaly | 0.41235 |
| Inclination | 4.90443 |
| Longitude of ascending node | 299.27990 |
| Argument of peri | 314.24363 |
| Geometric albedo | 0.0649 |
| Absolute magnitude (H) | 11.20 |
4449 Sobinov (1987 RX3) is a main-belt asteroid discovered on September 3, 1987 by L. I. Chernykh at Nauchnyj.
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