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Table 2

RSE of the errors in the astrometric parameters and of the normalized errors (i.e., after division by the formal standard deviations) for different magnitude ranges. See text for further explanations.

Magnitude range No. stars RSE of error [μas and μas yr-1] ϱ =  RSE of normalized error [unitless]


α ∗  δ ϖ μα ∗  μδ α ∗  δ ϖ μα ∗  μδ

   G < 13 18 253 6.6 5.7 7.5 4.5 4.0 1.507 1.470 1.369 1.443 1.425
   13 ≤ G < 15 70 355 12.4 10.6 14.9 8.7 7.5 1.112 1.100 1.082 1.098 1.100
   15 ≤ G < 16 88 116 20.2 17.3 24.9 14.3 12.3 1.024 1.024 1.022 1.032 1.024
   16 ≤ G < 17 151 639 30.8 26.7 38.4 21.8 19.0 1.010 1.010 1.010 1.014 1.008
   17 ≤ G < 18 272 424 49.4 42.8 61.8 34.8 30.4 1.004 1.006 1.003 1.002 1.003
   18 ≤ G < 19 489 253 83.3 70.7 104.1 58.9 50.8 1.001 1.001 1.002 1.003 1.002
   19 ≤ G 1 166 182 167.9 140.0 207.6 118.5 100.2 1.001 1.000 1.000 1.001 1.000

   all G 2 256 222 116.8 98.7 145.6 82.4 70.6 1.009 1.009 1.007 1.009 1.008

Notes. The asterisk in α ∗  indicates that the errors are true arcs on the sky; cf. footnote 11.

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