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Gaia Data Release 2
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Table B.2

Summary statistics for the 361 million sources in Gaia DR2 with a fall-back solution (position only).

Median value at magnitude G

Quantity ≤ 12 13 14 15 16 17 18 19 20 21 Unit
Fraction of sources with fall-back solution 0.9 1.0 1.0 1.0 1.1 1.4 2.4 5.5 17.1 84.1 %
Standard uncertainty in α (σα*) at J2015.5 0.905 0.968 0.972 0.970 0.989 1.018 1.036 1.518 2.204 3.623 mas
Standard uncertainty in δ (σδ) at J2015.5 0.876 0.924 0.931 0.921 0.936 0.956 0.971 1.399 1.897 3.387 mas
Number of visibility periods used 10 11 11 10 9 8 7 6 6 6
Number of field-of-view transits used 16 19 19 18 15 13 11 9 9 8
Number of good CCD observations AL 133 161 158 149 130 107 96 79 78 62
Fraction of bad CCD observations AL 2.7 0.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 %

Notes. The table gives the median quantities at the magnitudes indicated in the header.

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