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Table B.1
Summary statistics for the 1332 million sources in Gaia DR2 with a full astrometric solution (five astrometric parameters).
Median value at magnitude G | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Quantity | ≤ 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | Unit |
Fraction of sources with 5-param. solution | 99.1 | 99.0 | 99.0 | 99.0 | 98.9 | 98.6 | 97.6 | 94.5 | 82.9 | 15.9 | % |
Standard uncertainty in α (σα*) at J2015.5 | 0.033 | 0.023 | 0.023 | 0.031 | 0.047 | 0.077 | 0.137 | 0.268 | 0.548 | 1.457 | mas |
Standard uncertainty in δ (σδ) at J2015.5 | 0.030 | 0.022 | 0.020 | 0.027 | 0.041 | 0.069 | 0.123 | 0.242 | 0.490 | 1.559 | mas |
Standard uncertainty in ϖ (σϖ) | 0.041 | 0.029 | 0.028 | 0.038 | 0.057 | 0.094 | 0.165 | 0.317 | 0.651 | 2.104 | mas |
Standard uncertainty in μα* (σμα*) | 0.068 | 0.047 | 0.047 | 0.063 | 0.096 | 0.158 | 0.280 | 0.550 | 1.164 | 3.114 | mas yr−1 |
Standard uncertainty in μδ (σμδ) | 0.059 | 0.042 | 0.040 | 0.054 | 0.082 | 0.137 | 0.243 | 0.479 | 1.011 | 3.374 | mas yr−1 |
Fraction with significant excess noise | 20.6 | 21.0 | 17.8 | 17.9 | 18.4 | 19.2 | 20.6 | 21.2 | 18.2 | 10.6 | % |
Excess source noise (when significant) | 0.183 | 0.249 | 0.311 | 0.331 | 0.367 | 0.474 | 0.701 | 1.226 | 2.235 | 4.563 | mas |
Number of visibility periods used | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 9 | |
Number of field-of-view transits used | 26 | 26 | 26 | 26 | 25 | 25 | 24 | 23 | 22 | 12 | |
Number of good CCD observations AL | 220 | 227 | 226 | 223 | 218 | 215 | 212 | 199 | 194 | 102 | |
Fraction of bad CCD observations AL | 2.7 | 0.8 | 0.0 | 0.4 | 0.4 | 0.4 | 0.4 | 0.5 | 0.4 | 0.5 | % |
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