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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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