| Discovery | |
|---|---|
| Discovered by | Max Wolf |
| Discovery site | Heidelberg |
| Discovery date | 16 November 1904 |
| Designations | |
| MPC designation | (551) Ortrud |
| Pronunciation | German: [ˈɔʁtʁʊt] |
| Alternative designations | 1904 PM |
| Orbital characteristics | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 111.06 yr (40565 d) |
| Aphelion | 3.3325 AU (498.53 Gm) |
| Perihelion | 2.6019 AU (389.24 Gm) |
| Semi-major axis | 2.9672 AU (443.89 Gm) |
| Eccentricity | 0.12311 |
| Orbital period (sidereal) | 5.11 yr (1866.9 d) |
| Mean anomaly | 306.688° |
| Mean motion | 0° 11 34.188 / day |
| Inclination | 0.39727° |
| Longitude of ascending node | 6.0272° |
| Argument of perihelion | 68.010° |
| Physical characteristics | |
| Mean radius | 39.23±2.05 km |
| Synodic rotation period | 13.05 h (0.544 d) |
| Geometric albedo | 0.0426±0.005 |
| Absolute magnitude (H) | 9.57 |
551 Ortrud is a minor planet orbiting the Sun. It is located in the Main Belt. In light of the practice of the discover c. 1904 to name his asteroids after female characters in opera, it is likely that Ortrud is named after a character in Richard Wagner's opera Lohengrin.
References
- (German Names)
- "551 Ortrud (1904 PM)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 5 May 2016.
External links
- 551 Ortrud at AstDyS-2, Asteroids—Dynamic Site
- 551 Ortrud at the JPL Small-Body Database
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