Ortrud (minor planet designation: 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.
Discovery | |
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Discovered by | Max Wolf |
Discovery site | Heidelberg |
Discovery date | 16 November 1904 |
Designations | |
MPC designation | (551) Ortrud |
Pronunciation | German: [ˈɔʁtʁʊt][1] |
Alternative designations | 1904 PM |
Orbital characteristics[2] | |
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° 11m 34.188s / 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 |
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