Table 6
Statistics of the average gaps and the relative angles between chips.
| Date | Item | <mean> | σ | <mean> | σ | <mean> | σ | <mean> | σ |
|---|---|---|---|---|---|---|---|---|---|
| CCD1(CCD2) | CCD4(CCD3) | CCD4(CCD2) | CCD1(CCD3) | ||||||
| 2016 | GD1gap | 142.853 | 0.019 | 138.590 | 0.018 | 373.893 | 0.023 | 364.373 | 0.014 |
| GD1angle | -0.003 | 0.001 | 0.167 | 0.001 | 89.877 | 0.000 | 89.960 | 0.000 | |
| GD2gap | 142.935 | 0.017 | 138.649 | 0.022 | 373.925 | 0.016 | 364.385 | 0.015 | |
| GD2angle | -0.002 | 0.001 | 0.169 | 0.001 | 89.877 | 0.001 | 89.960 | 0.000 | |
| 2017 | GD1gap | 142.079 | 0.029 | 137.686 | 0.028 | 369.456 | 0.021 | 363.432 | 0.023 |
| GD1angle | 0.023 | 0.001 | 0.104 | 0.001 | 89.904 | 0.001 | 89.968 | 0.001 | |
| GD2gap | 142.091 | 0.034 | 137.682 | 0.035 | 369.460 | 0.028 | 363.417 | 0.028 | |
| GD2angle | 0.022 | 0.001 | 0.104 | 0.001 | 89.903 | 0.001 | 89.968 | 0.001 | |
Notes. GD1 means the result of photographic astrometry and GD2 means the result of differential astrometry. Columns 3 to 10 show the average and the precision for the gaps and the angles. The reference chips are in parentheses. The results of the gaps are in pixels and the results of relative angles are in degrees.
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