variations over the sky of the astrometric performance

Numerical factor to be applied to the sky-averaged astrometric errors for the different astrometric parameters as function of ecliptic latitude β, including the effect of the variation of the number of transits over the sky.

 

  |sin(β)|   α* δ π μα* μδ
0.025   1.026     0.756     1.180     0.725     0.542  
0.075 1.021 0.757 1.180 0.722 0.542
0.125 1.002 0.751 1.169 0.710 0.537
0.175 0.993 0.752 1.167 0.703 0.539
0.225 0.973 0.751 1.158 0.689 0.538
0.275 0.952 0.742 1.143 0.673 0.533
0.325 0.934 0.740 1.136 0.662 0.533
0.375 0.901 0.730 1.119 0.640 0.525
0.425 0.861 0.718 1.098 0.614 0.515
0.475 0.819 0.705 1.072 0.584 0.506
0.525 0.765 0.691 1.043 0.548 0.493
0.575 0.701 0.673 1.009 0.500 0.477
0.625 0.631 0.650 0.970 0.541 0.461
0.675 0.535 0.621 0.922 0.381 0.437
0.725 0.469 0.607 0.850 0.327 0.423
0.775 0.554 0.636 0.808 0.386 0.443
0.825 0.603 0.654 0.779 0.422 0.456
0.875 0.641 0.669 0.755 0.447 0.467
0.925 0.668 0.680 0.731 0.466 0.473
0.975 0.688 0.706 0.713 0.481 0.490
Mean 0.787 0.699 1.000 0.556 0.496

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