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Discovery and designation
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| Discovered by | E. W. Elst |
| Discovery site | European Southern Observatory |
| Discovery date | August 6, 1991 |
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Designations
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| MPC designation | 8857 |
| Named after | Cercidiphyllum |
| Alternate name(s) | 1991 PA7 |
| Epoch May 14, 2008 | |
| Ap | 2.8357176 |
| Peri | 2.0055290 |
| Eccentricity | 0.1714824 |
| Orbital period | 1375.5907159 |
| Mean anomaly | 179.25854 |
| Inclination | 2.26110 |
| Longitude of ascending node | 346.58406 |
| Argument of peri | 311.07610 |
| Absolute magnitude (H) | 14.7 |
8857 Cercidiphyllum (1991 PA7) is a main-belt asteroid discovered on August 6, 1991 by E. W. Elst at the European Southern Observatory.
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