Gaia Data Release 1
Free Access

Table A.2

Comparison between TGAS (or TGAS counterparts) and full catalogue error distributions.

Gaia

Position precision TGAS sources All Bright Bulk
RA error <= 17 ~100% 94.82% 99.77 % 95.79%

2MASS

Position precision TGAS counterparts All Bright Bulk
errMaj <= 400 99.99% 99.66% 99.97% 99.49%

UCAC4

Position precision TGAS counterparts All Bright Bulk
RAerror <= 450 ~100% 96.45% 99.47% 95.32%

GSC23

Position precision TGAS counterparts All
RAerror <= 225 99.48% 0.35%

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