Table 2: Basic data of suspected NGC 1901 members (M in the last column, or not: NM).
ID Designation $\alpha$ $\delta$ U B V I $\mu_{\alpha}$ $\mu_{\delta}$ RV Dic02 RV Dic03 RV Oct05 Spectral Type Membership
    hh:mm:s $\circ$:$\prime$: $\prime\prime$ mag mag mag mag  mas/yr ms/yr  km s-1  km s-1  km s-1    
2 HD 35294 05:18:03.258 -68:27:56.69 9.63 9.15 8.38 7.55 1.0 $\pm$ 1.2 9.4 $\pm$ 0.9   4.3 $\pm$ 1.0 2.4 $\pm$ 1.4 G2IV M
3 HD 35183 05:17:23.034 -68:28:19.12 9.51 9.33 9.15 8.94 1.5 $\pm$ 1.2 9.5 $\pm$ 1.1 1.8 $\pm$ 0.8 29.0 $\pm$ 1.0 -2.5 $\pm$ 0.5 A3V M
4 HD 35293 05:18:02.089 -68:21:19.48 9.66 9.46 9.33 9.12 -0.8 $\pm$ 1.0 12.1 $\pm$ 1.1 27.9 $\pm$ 1.0 60.6 $\pm$ 1.0 48.9 $\pm$ 0.7 A1 M
5 HD 35462 05:19:10.754 -68:34:51.72 10.28 10.13 9.81 9.49 1.2 $\pm$ 1.3 10.2 $\pm$ 1.0   31.6 $\pm$ 1.0 18.3 $\pm$ 0.8 A2V M
6 HD 269338 05:18:52.918 -68:34:13.35 10.76 10.65 10.37 10.08 -0.4 $\pm$ 1.2 12.1 $\pm$ 1.2   21.0 $\pm$ 1.1 -5.8 $\pm$ 0.6 A5 M
7 HD 269319 05:18:22.479 -68:28:01.63 10.64 10.49 10.22 9.97 2.8 $\pm$ 1.3 11.0 $\pm$ 1.0 27.6 $\pm$ 1.0   -0.9 $\pm$ 0.4 A5 M
8 HD 269312 05:18:11.983 -68:25:36.34 10.82 10.68 10.40 10.11 2.3 $\pm$ 2.2 7.8 $\pm$ 1.3 -1.1 $\pm$ 0.7   -6.7 $\pm$ 0.4   M
9 HD 269310 05:17:59.168 -68:31:27.72 10.92 10.75 10.46 10.14 2.7 $\pm$ 2.3 8.3 $\pm$ 1.7 10.0 $\pm$ 0.4   -0.1 $\pm$ 0.4 A7V M
10 HD 269301 05:17:35.815 -68:21:47.16 11.31 11.26 10.87 10.56 5.0 $\pm$ 1.3 11.2 $\pm$ 1.3 -11.4 $\pm$ 0.6   2.0 $\pm$ 0.6 A9V M
12 HD 269315 05:18:16.683 -68:25:10.44 11.84 11.83 11.38 10.86 3.8 $\pm$ 1.3 6.9 $\pm$ 1.4 16.9 $\pm$ 0.7   17.7 $\pm$ 0.7 F5V NM
13 HD 269324 05:18:29.529 -68:27:13.81 12.11 12.07 11.55 10.95 2.9 $\pm$ 1.5 11.3 $\pm$ 2.0 0.6 $\pm$ 1.6   0.2 $\pm$ 1.4 F6V M
14 HD 269334 05:18:42.738 -68:27:32.76 12.04 12.03 11.58 11.09 1.9 $\pm$ 2.9 8.3 $\pm$ 1.3 -1.8 $\pm$ 1.1   0.3 $\pm$ 0.9 F3V M
17 GSC 916200464 05:18:27.560 -68:31:28.36 11.71 12.37 12.39 12.35 12.6 $\pm$ 5.0 -2.0 $\pm$ 2.4 268.6 $\pm$ 1.6     G5V NM
20 GSC 916200834 05:19:05.214 -68:30:45.75 12.74 12.80 12.27 11.67 -1.8 $\pm$ 2.7 11.7 $\pm$ 1.5 -0.9 $\pm$ 0.9   0.2 $\pm$ 1.3 F8V M
23 GSC 916200682 05:18:41.691 -68:22:29.24 14.07 13.36 12.31 11.38 1.1 $\pm$ 5.9 -2.8 $\pm$ 5.9 8.2 $\pm$ 1.6   8.7 $\pm$ 2.2 K0 NM
25 GSC 916201005 05:17:26.939 -68:25:41.23 13.32 13.16 12.53 11.79 1.6 $\pm$ 5.9 30.4 $\pm$ 5.9 24.9 $\pm$ 0.9   27.5 $\pm$ 1.0 F7 NM
27 GSC 916200626 05:18:19.173 -68:26:25.15 13.21 13.21 12.60 11.97 0.7 $\pm$ 2.4 9.9 $\pm$ 1.3 -3.4 $\pm$ 0.6   1.3 $\pm$ 1.3 F8V M
36 MACS 0517684015 05:17:40.773 -68:29:04.73 14.52 14.22 13.34 12.35 10.3 $\pm$ 5.9 32.6 $\pm$ 5.9 32.6 $\pm$ 1.1   35.5 $\pm$ 1.5   NM
40 UCAC 2-139 05:18:25.564 -68:17:19.25 14.48 14.37 13.74 12.96 -2.2 $\pm$ 5.9 3.8 $\pm$ 5.9 295.9 $\pm$ 2.4   298.8 $\pm$ 3.5   NM
41 GSC 0916200216 05:17:51.066 -68:24:34.62 17.43 15.54 13.76 12.15 5.7 $\pm$ 5.9 4.5 $\pm$ 5.9 30.1 $\pm$ 0.1   32.2 $\pm$ 0.2   NM

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