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Discovery
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| Discovered by | Johann Palisa |
| Discovery date | December 10, 1879 |
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Designations
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| Named after | Iseult |
| Alternate name(s) | A912 AB, A912 BA, 1950 FM |
| Minor planet category |
Main belt |
| Epoch 30 January 2005 (JD 2453400.5) | |
| Aphelion | 528.554 Gm (3.533 AU) |
| Perihelion | 380.83 Gm (2.546 AU) |
| Semi-major axis | 454.692 Gm (3.039 AU) |
| Eccentricity | 0.162 |
| Orbital period | 1935.434 d (5.3 a) |
| Average orbital speed | 17.08 km/s |
| Mean anomaly | 197.831° |
| Inclination | 3.883° |
| Longitude of ascending node | 263.771° |
| Argument of perihelion | 174.924° |
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Physical characteristics
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| Dimensions | 143.0 km |
| Mass | unknown |
| Mean density | unknown |
| Equatorial surface gravity | unknown |
| Escape velocity | unknown |
| Rotation period | 18.365 h |
| Albedo | 0.060 |
| Temperature | unknown |
| Spectral type | C |
| Absolute magnitude (H) | 7.89 |
211 Isolda is a very large, dark main-belt asteroid. It is classified as a C-type asteroid and is probably composed of primitive carbonaceous material.
It was discovered by Johann Palisa on December 10, 1879, in Pola, and named after Isolde, heroine of the legend of Tristan and Iseult.
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