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Discovery and designation
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| Discovered by | S. J. Bus |
| Discovery site | Siding Spring |
| Discovery date | March 2, 1981 |
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Designations
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| MPC designation | 2990 |
| Alternate name(s) | 1981 EN27 |
| Epoch May 14, 2008 | |
| Ap | 2.7349636 |
| Peri | 2.1440672 |
| Eccentricity | 0.1211094 |
| Orbital period | 1391.7261417 |
| Mean anomaly | 85.51632 |
| Inclination | 2.79218 |
| Longitude of ascending node | 171.96121 |
| Argument of peri | 318.12429 |
| Absolute magnitude (H) | 13.4 |
2990 Trimberger (1981 EN27) is a main-belt asteroid discovered on March 2, 1981 by S. J. Bus at Siding Spring.
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