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Discovery and designation
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| Discovered by | Chernykh, N. |
| Discovery site | Nauchnyj |
| Discovery date | September 6, 1978 |
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Designations
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| MPC designation | 2786 |
| Named after | Alexander Grin |
| Alternate name(s) | 1978 RR5 |
| Epoch May 14, 2008 | |
| Ap | 3.0623120 |
| Peri | 2.1505110 |
| Eccentricity | 0.1749150 |
| Orbital period | 1536.9612278 |
| Mean anomaly | 0.54250 |
| Inclination | 13.24052 |
| Longitude of ascending node | 9.34111 |
| Argument of peri | 20.31372 |
| Absolute magnitude (H) | 12.0 |
2786 Grinevia (1978 RR5) is a main-belt asteroid discovered on September 6, 1978 by Chernykh, N. at Nauchnyj.
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