| Minorplanet: | yes |
| Background: |
|
| 211 Isolda | |
| Discovered: | 10 December 1879 |
| Mpc Name: | (211) Isolda |
| Pronounced: | [1] |
| Adjective: | Isoldian [2] |
| Alt Names: | A879 XA, 1912 AB 1912 BA, 1950 FM |
| Epoch: | 31 July 2016 (JD 2457600.5) |
| Semimajor: | 3.04205AU |
| Perihelion: | 2.5514AU |
| Aphelion: | 3.5327abbr=onNaNabbr=on |
| Eccentricity: | 0.16129 |
| Period: | 5.31 yr (1938.0 d) |
| Inclination: | 3.8856° |
| Asc Node: | 263.644° |
| Arg Peri: | 173.522° |
| Avg Speed: | 17.08 km/s |
| Dimensions: | 149.81 ± 6.10 km |
| Density: | 2.54 ± 1.41 g/cm3 |
| Rotation: | 18.365abbr=onNaNabbr=on |
| Spectral Type: | C (Tholen) |
| Abs Magnitude: | 7.89, 7.90 |
| Albedo: | 0.0598 ± 0.0218 |
| Mean Motion: | / day |
| Orbit Ref: | [3] |
| Observation Arc: | 136.19 yr (49742 d) |
| Uncertainty: | 0 |
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. The spectra of the asteroid displays evidence of aqueous alteration.
It was discovered by Austrian astronomer Johann Palisa on 10 December 1879, in Pola, and is possibly named after Isolde, heroine of the legend of Tristan and Iseult.[4]
In 2001, the asteroid was detected by radar from the Arecibo Observatory at a distance of 1.78 AU. The resulting data yielded an effective diameter of .
Between 2009 and 2022, 211 Isolda has been observed to occult seven stars.