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Discovery and designation
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| Discovered by | M. Koishikawa |
| Discovery site | Ayashi Station of the Sendai Astronomical Observatory |
| Discovery date | February 13, 1991 |
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Designations
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| MPC designation | 6859 |
| Named after | Date Masamune |
| Alternate name(s) | 1991 CZ |
| Epoch May 14, 2008 | |
| Ap | 1.8588585 |
| Peri | 1.8084865 |
| Eccentricity | 0.0137353 |
| Orbital period | 906.9452735 |
| Mean anomaly | 201.41183 |
| Inclination | 23.19828 |
| Longitude of ascending node | 154.09627 |
| Argument of peri | 129.61441 |
| Absolute magnitude (H) | 13.3 |
6859 Datemasamune (1991 CZ) is an inner main-belt asteroid discovered on February 13, 1991 by M. Koishikawa at the Ayashi Station of the Sendai Astronomical Observatory.
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