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Table A.1:

USNO-B1 stars towards $\sigma $ Orionis with $\mu _{\rm USNO-B1} > 40$ mas a-1, $J_{\rm 2MASS} < 15.5$ mag, and $N_{\rm USNO-B1} > 3$: coordinates, magnitudes, and proper motions.
  2MASS   USNO-B1   This work

No. 		$\alpha^{J2000}$ $\delta^{J2000}$ J   $\mu_\alpha \cos{\delta}$ $\mu_\delta$ N   $\mu_\alpha \cos{\delta}$ $\mu_\delta$ N
      [mag]   [mas a-1] [mas a-1]     [mas a-1] [mas a-1]  
01 084.595001 -03.064613 14.59 $\pm$ 0.03   +18 -40 5   +19.2 $\pm$ 1.0 -36.3 $\pm$ 1.7 9
02 084.425714 -03.025405 14.53 $\pm$ 0.03   -82 -62 5   -54.0 $\pm$ 1.9 -62.7 $\pm$ 1.2 8
03 084.826136 -03.013852 13.07 $\pm$ 0.02   +10 -50 5   +11.4 $\pm$ 1.1 -46.1 $\pm$ 0.9 8
04 084.539224 -03.003337 14.26 $\pm$ 0.03   +30 +28 5   +11.0 $\pm$ 1.2 +3.9 $\pm$ 1.3 8
05 084.948355 -02.983131 10.36 $\pm$ 0.03   +42 -14 5   +47.6 $\pm$ 1.1 -17.5 $\pm$ 0.9 9
06 084.850070 -02.963510 11.26 $\pm$ 0.03   +32 +80 5   +34.3 $\pm$ 0.5 +82.8 $\pm$ 1.0 9
07 084.850866 -02.924599 11.79 $\pm$ 0.03   +14 -54 5   +14.0 $\pm$ 0.7 -59.5 $\pm$ 0.5 9
08 084.642299 -02.859457 15.18 $\pm$ 0.04   +54 -52 4   +44.3 $\pm$ 1.5 -61.9 $\pm$ 0.7 7
09 084.244956 -02.819184 13.62 $\pm$ 0.04   +6 +70 4   -9.4 $\pm$ 1.6 -22.9 $\pm$ 1.6 9
10 084.369333 -02.779688 14.81 $\pm$ 0.03   -28 -36 5   -29.9 $\pm$ 0.7 -37.9 $\pm$ 1.2 7
11 084.706846 -02.757468 13.15 $\pm$ 0.03   -54 -24 5   -55.3 $\pm$ 0.9 -23.1 $\pm$ 1.8 8
12 084.533024 -02.752464 15.33 $\pm$ 0.05   +20 -36 4   -7.5 $\pm$ 1.8 -72.0 $\pm$ 1.6 7
13 084.485297 -02.732624 13.04 $\pm$ 0.03   +20 -40 5   +20.2 $\pm$ 1.1 -41.5 $\pm$ 0.9 8
14 085.152776 -02.729698 11.54 $\pm$ 0.03   +50 +10 4   +43.9 $\pm$ 0.9 +0.3 $\pm$ 1.0 9
15 085.098384 -02.718792 11.37 $\pm$ 0.03   +62 -96 5   +63.8 $\pm$ 1.2 -89.4 $\pm$ 1.5 10
16 084.730988 -02.691593 12.17 $\pm$ 0.03   +96 +8 5   +96.6 $\pm$ 0.9 +11.8 $\pm$ 0.7 9
17 084.270844 -02.684343 14.37 $\pm$ 0.03   +6 -42 5   +3.5 $\pm$ 1.0 -43.3 $\pm$ 1.0 7
18 084.523630 -02.672057 12.77 $\pm$ 0.03   -20 -40 4   +24.3 $\pm$ 1.2 -74.4 $\pm$ 1.3 8
19 085.122689 -02.651908 13.98 $\pm$ 0.03   -12 -46 5   -8.9 $\pm$ 1.2 -43.5 $\pm$ 0.5 8
20 084.472224 -02.602508 14.94 $\pm$ 0.05   +38 +30 5   -2.6 $\pm$ 1.3 -20.2 $\pm$ 0.9 8
21 085.032746 -02.598684 14.65 $\pm$ 0.04   +6 -40 5   -9.1 $\pm$ 0.7 -30.0 $\pm$ 1.9 8
22 084.346086 -02.546276 14.18 $\pm$ 0.04   -42 +0 5   -20.0 $\pm$ 0.7 -22.2 $\pm$ 0.6 8
23 084.257197 -02.544301 15.29 $\pm$ 0.07   +40 -18 4   +40.0 $\pm$ 0.7 -40.2 $\pm$ 1.1 8
24 084.379406 -02.528789 10.46 $\pm$ 0.03   +50 -282 5   +49.9 $\pm$ 0.4 -282.0 $\pm$ 0.8 9
25 085.175498 -02.516978 14.17 $\pm$ 0.03   -30 -34 5   -28.8 $\pm$ 1.0 -32.9 $\pm$ 1.0 8
26 084.815180 -02.499121 9.81 $\pm$ 0.03   +0 -42 5   -0.6 $\pm$ 1.1 -39.9 $\pm$ 0.6 9
27 084.622984 -02.479908 14.87 $\pm$ 0.03   +32 +46 5   +33.9 $\pm$ 1.4 +36.9 $\pm$ 1.0 8
28 084.353969 -02.476976 12.75 $\pm$ 0.02   -10 -40 5   -9.9 $\pm$ 0.4 -38.5 $\pm$ 0.8 8
29 085.159839 -02.451720 14.02 $\pm$ 0.03   +78 -104 4   +70.7 $\pm$ 1.1 -115.3 $\pm$ 1.2 7
30 084.665077 -02.447131 11.22 $\pm$ 0.03   +46 -18 5   +48.4 $\pm$ 0.9 -25.8 $\pm$ 0.6 10
31 084.774245 -02.437633 14.34 $\pm$ 0.03   -6 -40 5   -5.0 $\pm$ 0.3 -43.4 $\pm$ 0.6 7
32 084.462951 -02.435409 14.92 $\pm$ 0.04   +240 -210 4   -5.8 $\pm$ 0.5 -13.0 $\pm$ 1.3 7
33 084.806169 -02.397745 13.95 $\pm$ 0.03   +50 +22 5   +54.1 $\pm$ 0.5 +25.1 $\pm$ 0.4 8
34a 084.362205 -02.365031 11.41 $\pm$ 0.02   -18 +44 5   -23.9 $\pm$ 1.1 +44.6 $\pm$ 1.5 10
35 084.999408 -02.339369 14.59 $\pm$ 0.03   +44 +12 5   +44.3 $\pm$ 0.5 +11.6 $\pm$ 0.6 8
36 085.004221 -02.333267 13.10 $\pm$ 0.03   -12 +48 4   -7.0 $\pm$ 0.6 -5.9 $\pm$ 0.3 7
37 084.923889 -02.329536 14.22 $\pm$ 0.03   +20 -36 5   +25.5 $\pm$ 0.8 -32.8 $\pm$ 0.8 8
38 084.720246 -02.324637 14.23 $\pm$ 0.03   +70 -108 5   +8.9 $\pm$ 0.7 -1.4 $\pm$ 0.8 8
39 084.355084 -02.267993 13.80 $\pm$ 0.04   -34 -54 5   -34.1 $\pm$ 0.2 -56.0 $\pm$ 0.3 7
40 084.543043 -02.233226 13.47 $\pm$ 0.03   +104 -6 5   +96.4 $\pm$ 0.4 -6.3 $\pm$ 0.6 8
41b 084.969042 -02.192280 14.85 $\pm$ 0.04   +54 -82 4   +59.8 $\pm$ 1.2 -80.7 $\pm$ 1.1 8
42c 084.560575 -02.170903 12.48 $\pm$ 0.03   -52 -32 4   +2.4 $\pm$ 0.5 +6.3 $\pm$ 0.5 8

Notes. (a) Star No. 34 is a close binary, only resolved by UKIDSS ( $\rho \sim 2.8$ arcsec, $\theta \sim 128$ deg, $\Delta Z \sim \Delta K \sim 3$ mag).
(b) Star No. 41 is a close binary, only resolved by UKIDSS ( $\rho \sim 2.4$ arcsec, $\theta \sim 177$ deg, $\Delta Z \sim \Delta K \sim 3$ mag).
(c) The USNO-B1 proper motion values of star No. 42 actually correspond to a faint source at 4.5 arcsec to the southwest of the tabulated coordinates (see Sect. 3.1.1).


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