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Discovery and designation
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| Discovered by | E. W. Elst |
| Discovery site | European Southern Observatory |
| Discovery date | July 20, 1993 |
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Designations
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| MPC designation | 12755 |
| Named after | Johann Jakob Balmer |
| Alternate name(s) | 1993 OS10 |
| Epoch May 14, 2008 | |
| Ap | 2.7852692 |
| Peri | 2.6644862 |
| Eccentricity | 0.0221630 |
| Orbital period | 1642.9296045 |
| Mean anomaly | 79.98771 |
| Inclination | 4.03151 |
| Longitude of ascending node | 273.94425 |
| Argument of peri | 50.13886 |
| Absolute magnitude (H) | 13.5 |
12755 Balmer (1993 OS10) is a main-belt asteroid discovered on July 20, 1993 by E. W. Elst at the European Southern Observatory.
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