Table 1: Main properties of the proper motion catalogues used in this work. For each catalogue we list: the 99% magnitude completeness range ( $\Delta m$ ), the limiting magnitude ( $m_{\rm lim}$ ), the reference passband, the maximum time baseline ( $\Delta T$ ) in years, the reference epoch, the absolute average positional ( $\sigma _{\alpha }$ , $\sigma _{\delta }$ ) and proper motion accuracies ( $\sigma \mu _{\alpha }$ , $\sigma \mu _{\delta }$ ) in right ascension and declination, in mas and mas yr^-1, respectively.
Catalogue $\Delta m$ $m_{\rm lim}$ Band $\Delta T$ Epoch $\delta_{\alpha}$ $\delta_{\delta}$ $\sigma \mu _{\alpha }$ $\sigma \mu _{\delta }$ Reference

Hipparcos 7.3-9 12.4 H_p 1989.8-1993.2 1991.25 0.77 0.64 0.88 0.74 Perryman et al. (1997)

Tycho-2 1-11 15.2 V_T 1989.8-1993.2 2000.00 60 60 2.5 2.5 Høg et al. (2000)

UCAC-2¹ n/a 16.0 R 1998.1-2002.9 2000.00 15-70 15-70 1-7 1-7 Zacharias et al. (2004)

USNO-B 1-21 22.0 V_J 1950-1998 2000.00 200 200 <20 <20 Monet et al. (2003)

GSC-2² 1-20.5 22.5 F 1950-1998 1987-1998 250 250 <10 <10 in preparation

¹ In its present release, the UCAC-2 catalogue does not cover the declination strip $+40^\circ \le \delta \le +52^\circ$ and the magnitude completeness is not uniform.
² Version 2.3.2 (consortium release). Proper motion information is still incomplete and affected by a 10 mas yr^-1 systematic error in the southern hemisphere ( $\delta \le -25^\circ$ ). The positions reported in the GSC-2 catalogue have not been normalized to a given reference epoch but refer to the mean epoch of the most recent observations.

**Table 1:** Main properties of the proper motion catalogues used in this work. For each catalogue we list: the 99% magnitude completeness range ( $\Delta m$ ), the limiting magnitude ( $m_{\rm lim}$ ), the reference passband, the maximum time baseline ( $\Delta T$ ) in years, the reference epoch, the absolute average positional ( $\sigma _{\alpha }$ , $\sigma _{\delta }$ ) and proper motion accuracies ( $\sigma \mu _{\alpha }$ , $\sigma \mu _{\delta }$ ) in right ascension and declination, in mas and mas yr^-1, respectively.
Catalogue	$\Delta m$	$m_{\rm lim}$	Band	$\Delta T$	Epoch	$\delta_{\alpha}$	$\delta_{\delta}$	$\sigma \mu _{\alpha }$	$\sigma \mu _{\delta }$	Reference
Hipparcos	7.3-9	12.4	H_p	1989.8-1993.2	1991.25	0.77	0.64	0.88	0.74	Perryman et al. (1997)
Tycho-2	1-11	15.2	V_T	1989.8-1993.2	2000.00	60	60	2.5	2.5	Høg et al. (2000)
UCAC-2¹	n/a	16.0	R	1998.1-2002.9	2000.00	15-70	15-70	1-7	1-7	Zacharias et al. (2004)
USNO-B	1-21	22.0	V_J	1950-1998	2000.00	200	200	<20	<20	Monet et al. (2003)
GSC-2²	1-20.5	22.5	F	1950-1998	1987-1998	250	250	<10	<10	in preparation

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