Joint astrometric solution of HIPPARCOS and Gaia - A recipe for the Hundred Thousand Proper Motions project

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Volume 571 (November 2014)

A&A, 571 (2014) A85

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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	250^a	458	207	–	14	27
7–8	23 679	497	14 434	41	2692	35	318	684	81	–	43	261^a	608	204	–	19	30
8–9	40 729	682	19 947	41	2369	35	330	939	77	–	43	271^a	840	197	–	26	35
9–10	27 913	936	27 629	40	2663	35	333	1284	77	–	43	274^a	1165	194	–	35	43
10–11	8563	1403	41 352	42	5240	36	343	1921	83	–	46	283^a	1744	205	–	50	60
11–12	2501	2125	61 896	41	13 687	35	357	2882	78	–	47	291^a	2607	195	–	70	85
≥12	630	3248	109 030	42	13 926	38	378	4291	80	–	51	295^a	4578	209	–	94	134

all	113 396	753	22 148	41	2856	35	328	1033	79	–	44	271^a	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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