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Discovery and designation
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| Discovered by | F. Borngen |
| Discovery site | Tautenburg |
| Discovery date | April 6, 1989 |
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Designations
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| MPC designation | 19139 |
| Named after | Petrus Apianus |
| Alternate name(s) | 1989 GJ8, 1999 XP18 |
| Epoch May 14, 2008 | |
| Ap | 2.7799081 |
| Peri | 2.3880239 |
| Eccentricity | 0.0758300 |
| Orbital period | 1517.1503096 |
| Mean anomaly | 17.10851 |
| Inclination | 8.02821 |
| Longitude of ascending node | 48.27748 |
| Argument of peri | 337.81636 |
| Absolute magnitude (H) | 13.3 |
19139 Apian is a main-belt asteroid discovered on April 6, 1989 by F. Borngen at the astronomical observatory of the Thuringian State Observatory Tautenburg, Germany.
Apian is named after the German humanist Peter Apian. The name applies as official international standard and is registered at the International Astronomical Union (IAU).
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