Table 3
Summary of the different simulations.
| Data set | Case | Characteristic | VLBI_ | GAIA_ |
| time | QUASAR | QUASAR | ||
| τcor [yr] | σvar [μas] | σvar [μas] | ||
|
|
||||
| Case A | GUMS | – | 0 | 0 |
| Case B | GUMS | 2 | 100 | 100 |
| Case C | GUMS | 10 | 100 | 100 |
| Case D | IGQL | – | 0 | 0 |
Notes. In all cases the nominal Gaia observation noise and a nominal attitude noise of 10 μas is used. Case A is an ideal reference simulation, while cases B and C introduce quasar variability with different timescales. In case D we use the IGQL data set to show the impact of a non-uniform sky distribution Fig. 4.
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