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Discovery
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| Discovered by | E. L. Johnson |
| Discovery site | Johannesburg (UO) |
| Discovery date | September 7, 1947 |
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Designations
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| MPC designation | 1585 |
| Alternate name(s) | 1947 RG |
| Epoch May 14, 2008 | |
| Ap | 3.8320867 |
| Peri | 2.0298129 |
| Eccentricity | 0.3074556 |
| Orbital period | 1832.7828027 |
| Mean anomaly | 355.68143 |
| Inclination | 26.16824 |
| Longitude of ascending node | 150.14968 |
| Argument of peri | 264.71524 |
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Physical characteristics
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| Albedo | 0.0378 |
| Absolute magnitude (H) | 10.66 |
1585 Union (1947 RG) is a main-belt asteroid discovered on September 7, 1947 by E. L. Johnson at Johannesburg (UO).
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