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Discovery and designation
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| Discovered by | Claes-Ingvar Lagerkvist |
| Discovery site | European Southern Observatory |
| Discovery date | August 22, 1979 |
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Designations
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| MPC designation | 10021 |
| Alternate name(s) | 1979 QC1 |
| Epoch May 14, 2008 | |
| Ap | 2.7529120 |
| Peri | 1.9412784 |
| Eccentricity | 0.1729017 |
| Orbital period | 1313.3923886 |
| Mean anomaly | 312.79210 |
| Inclination | 11.69165 |
| Longitude of ascending node | 326.31706 |
| Argument of peri | 60.71328 |
| Absolute magnitude (H) | 14.4 |
10021 Henja (1979 QC1) is a main-belt asteroid discovered on August 22, 1979 by Claes-Ingvar Lagerkvist at the European Southern Observatory. It was named after Karin Henja, a famous Swedish crossword compiler.
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