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Discovery and designation
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| Discovered by | Lincoln Laboratory Near-Earth Asteroid Research Team |
| Discovery site | Socorro |
| Discovery date | October 10, 1999 |
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Designations
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| MPC designation | 22940 |
| Alternate name(s) | 1999 TF178 |
| Epoch May 14, 2008 | |
| Ap | 2.7516715 |
| Peri | 2.0174867 |
| Eccentricity | 0.1539443 |
| Orbital period | 1344.9806667 |
| Mean anomaly | 225.19157 |
| Inclination | 3.64545 |
| Longitude of ascending node | 74.94145 |
| Argument of peri | 199.31204 |
| Absolute magnitude (H) | 15.1 |
22940 Chyan (1999 TF178) is a main-belt asteroid discovered on October 10, 1999 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
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