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Designations
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| MPC designation | 2240 |
| Alternate name(s) | 1978 YA |
| Epoch May 14, 2008 | |
| Ap | 3.6400376 |
| Peri | 2.6496642 |
| Eccentricity | 0.1574595 |
| Orbital period | 2037.0351090 |
| Mean anomaly | 89.77902 |
| Inclination | 0.84544 |
| Longitude of ascending node | 60.74818 |
| Argument of peri | 26.16360 |
| Geometric albedo | 0.0544 |
| Absolute magnitude (H) | 11.80 |
2240 Tsai (1978 YA) is a main-belt asteroid. It is named after the Taiwanese astronomer Tsai Changhsien (Traditional Chinese:蔡章獻, 1924–2009).
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