Open Access
Table 2
Statistical summary of the 1141 million sources in the secondary data set of Gaia DR1.
| Quantity | 10% | 50% | 90% | Unit | ||
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| Standard uncertainty in α (σα ∗ = σαcosδ) | 0.285 | 1.802 | 12.871 | mas | ||
| Standard uncertainty in δ (σδ) | 0.257 | 1.568 | 11.306 | mas | ||
| Semi-major axis of error ellipse in position (σpos, max): | ||||||
| G< 16 (7% of the secondary data set) | 0.106 | 0.255 | 4.118 | mas | ||
| G = 16−17 (7%) | 0.182 | 0.484 | 11.105 | mas | ||
| G = 17−18 (13%) | 0.284 | 0.761 | 11.534 | mas | ||
| G = 18−19 (22%) | 0.501 | 1.444 | 13.027 | mas | ||
| G = 19−20 (31%) | 0.986 | 2.816 | 16.314 | mas | ||
| G = 20−21 (20%) | 2.093 | 7.229 | 21.737 | mas | ||
| all magnitudes (100%) | 0.349 | 2.345 | 15.699 | mas | ||
| Excess source noise (ϵi) | 0.000 | 0.594 | 2.375 | mas | ||
| Number of field-of-view transits input to the solution (N) | 7 | 13 | 26 | |||
| Number of good CCD observations AL used in the solution (ngood) | 41 | 71 | 157 | |||
| Fraction of bad CCD observations AL (nbad/ (ngood + nbad)) | 0.0 | 0.0 | 2.0 | % | ||
| Magnitude in Gaia’s unfiltered band (G) | 16.49 | 19.02 | 20.32 | mag | ||
Notes. Columns headed 10%, 50%, and 90% give the lower decile, median, and upper decile of the quantities for the 1 140 662 719 secondary sources. See footnote 7 for the definition of good and bad CCD observations.
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