| Name | |
|---|---|
| Name | Ortrud |
| Designation | 1904 PM |
| Discovery | |
| Discoverer | Max Wolf |
| Discovery date | November 16, 1904 |
| Discovery site | Heidelberg |
| Orbital elements | |
| Epoch August 18, 2005 (JDCT 2453600.5) | |
| Eccentricity (e) | 0.126 |
| Semimajor axis (a) | 2.964 AU |
| Perihelion (q) | 2.591 AU |
| Aphelion (Q) | 3.338 AU |
| Orbital period (P) | 5.104 a |
| Inclination (i) | 0.403° |
| Longitude of the ascending node (Ω) | 6.189° |
| Argument of Perihelion (ω) | 69.597° |
| Mean anomaly (M) | 253.005° |
551 Ortrud is a minor planet orbiting the Sun. It is located in the Main Belt.