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Table 2

Predicted uncertainties of the astrometric parameters of the Hipparcos stars.

Mag. Number Position [μas] Parallax [μas] Proper motion [μas yr-1]
Hip Hip2015 Gaia 12 HTPM Hip Gaia 12 HTPM Hip Gaia 12 HTPM
A B A B A B A B A B A B
6–7 9381 367 10 892 41 3388 36 312 501 82 – 43 250a 458 207 – 14 27
7–8 23 679 497 14 434 41 2692 35 318 684 81 – 43 261a 608 204 – 19 30
8–9 40 729 682 19 947 41 2369 35 330 939 77 – 43 271a 840 197 – 26 35
9–10 27 913 936 27 629 40 2663 35 333 1284 77 – 43 274a 1165 194 – 35 43
10–11 8563 1403 41 352 42 5240 36 343 1921 83 – 46 283a 1744 205 – 50 60
11–12 2501 2125 61 896 41 13 687 35 357 2882 78 – 47 291a 2607 195 – 70 85
≥12 630 3248 109 030 42 13 926 38 378 4291 80 – 51 295a 4578 209 – 94 134
all 113 396 753 22 148 41 2856 35 328 1033 79 – 44 271a 932 199 – 29 38

Notes. We compare the Hipparcos data alone (Hip) with a solution using only 12 months of Gaia data (Gaia 12), and a joint solution of Hipparcos and Gaia data (HTPM). Case A and B refer to the optimistic and conservative scenarios, respectively, described in the text. The two rightmost columns give the predicted HTPM proper motion uncertainties in the two cases.

(a)

Case B parallaxes are biased as shown in Fig. 2. This bias is not included in the RSE values given here.

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