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Table 2

Median standard deviations of the uncertainty distributions of the observables with which we convolve the ideal GUMS selected data to create more realistic catalogues.

Observable σTGAS σDR2 (G = 17) unit
RA 0.23 0.10 (mas)
Dec 0.21 0.09 (mas)
parallax 0.32 0.12 (mas)
μRA 0.99 0.19 (mas yr−1)
μDec 0.83 0.17 (mas yr−1)
vlos 1.08 2.50 (km s−1)
G 3 × 10−2 9 × 10−3 (mag)
GBP 3 × 10−2 8 × 10−2 (mag)
GRP 3 × 10−2 7 × 10−2 (mag)
[Fe/H] 0.25 0.25 (dex)

Notes. In the case of Gaia DR2, the uncertainties are those for a star with G = 17.

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