Direct imaging of extra-solar planets in star forming regions - Lessons learned from a false positive around IM Lupi

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Table 4

Proper motions for IM Lup found in major astrometric catalogues.

Origin^a	μ _α ^b	μ _δ^b	\|μ\|^c
	(mas/yr)	(mas/yr)	(mas/yr)

Hipparcos	–56.66 ± 15.41	–49.97 ± 7.31	76 ± 17
Leeuwen	–35.5 ± 21.81	–22.93 ± 14.98	42 ± 26
PMS^*	–3 ± 2	–21 ± 2	21 ± 3
SPM4	–12.7 ± 3.9	–21.5 ± 4	25 ± 6
PPMXL	–2.03 ± 4	–21.53 ± 4	22 ± 6
UCAC3	–15.4 ± 4.7	–22.6 ± 5.1	27 ± 7

Notes.

^(a)

Column (1) gives the origin of the measurement: Leeuwen: re-reduction of Hipparcos data (van Leeuwen 2007), PMS (Ducourant et al. 2005), SPM4: the Yale/San Juan SPM4 Catalog (2009, http://www.astro.yale.edu/astrom/spm4cat/spm4.html), PPMXL (Roeser et al. 2010), UCAC3 (Zacharias et al. 2010).

^(b)

Columns (2) and (3) give proper motions together with uncertainties.

^(c)

Column (4) gives the modulus of proper motion.

^(*)

Adopted in this work.

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