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Discovery and designation
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| Discovered by | G. W. Billings |
| Discovery site | Calgary |
| Discovery date | September 21, 1999 |
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Designations
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| MPC designation | 13405 |
| Alternate name(s) | 1999 ST1 |
| Epoch May 14, 2008 | |
| Ap | 2.5189685 |
| Peri | 2.0700513 |
| Eccentricity | 0.0978242 |
| Orbital period | 1269.5018404 |
| Mean anomaly | 24.06221 |
| Inclination | 4.83479 |
| Longitude of ascending node | 328.03213 |
| Argument of peri | 189.88978 |
| Absolute magnitude (H) | 13.8 |
13405 Dorisbillings (1999 ST1) is a main-belt asteroid discovered on September 21, 1999 by G. W. Billings at Calgary.
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