Table 3: Basic data of our $\sigma $ Orionis cluster members and candidates.

Name		 $\alpha^{J2000}$ $\delta^{J2000}$ I (mag) J (mag) $\log{\frac{L}{L_\odot}}$ Mass ($M_\odot $) Sp.Type Remarksa

S Ori J054000.2-025159		 05 40 00.15 -02 51 59.4 16.19 $\pm$ 0.04 14.04 $\pm$ 0.08 -1.43 $\pm$ 0.18 $\rm0.11^{+0.10 }_{-0.05 }$   Y
S Ori J053848.1-024401 05 38 48.19 -02 44 00.8 16.15 $\pm$ 0.03 14.09 $\pm$ 0.08 -1.45 $\pm$ 0.18 $\rm0.10^{+0.09 }_{-0.05 }$   Y,D
S Ori J053833.9-024508 05 38 33.88 -02 45 07.8 16.15 $\pm$ 0.03 14.24 $\pm$ 0.07 -1.51 $\pm$ 0.18 $\rm0.09^{+0.09 }_{-0.04 }$   Y,D
S Ori J053911.4-023333 05 39 11.40 -02 33 32.8 16.35 $\pm$ 0.04 14.38 $\pm$ 0.11 -1.57 $\pm$ 0.18 $\rm0.078^{+0.08 }_{-0.03 }$ M5.0 $\pm$ 0.5 Y
S Ori 14 05 39 37.60 -02 44 30.5 16.41 $\pm$ 0.04 14.40 $\pm$ 0.08 -1.58 $\pm$ 0.18 $\rm0.076^{+0.08 }_{-0.03 }$   Y
S Ori 11 05 39 44.33 -02 33 02.8 16.29 $\pm$ 0.04 14.50 $\pm$ 0.12 -1.60 $\pm$ 0.18 $\rm0.071^{+0.08 }_{-0.02 }$ M6.0 $\pm$ 0.5  
S Ori J054014.0-023127 05 40 13.96 -02 31 27.4 17.12 $\pm$ 0.03 14.51 $\pm$ 0.10 -1.60 $\pm$ 0.18 $\rm0.071^{+0.08 }_{-0.02 }$   Y
S Ori J053847.2-025756 05 38 47.15 -02 57 55.7 16.74 $\pm$ 0.02 14.54 $\pm$ 0.08 -1.63 $\pm$ 0.18 $\rm0.066^{+0.07 }_{-0.02 }$   Y,D
S Ori J053838.6-024157 05 38 38.59 -02 41 55.9 16.38 $\pm$ 0.03 14.56 $\pm$ 0.07 -1.63 $\pm$ 0.18 $\rm0.067^{+0.08 }_{-0.02 }$ M5.5 $\pm$ 1.0 Y
S Ori 16 05 39 15.10 -02 40 47.6 16.63 $\pm$ 0.03 14.61 $\pm$ 0.10 -1.66 $\pm$ 0.18 $\rm0.062^{+0.07 }_{-0.018}$    
S Ori J053902.1-023501 05 39 01.94 -02 35 02.9 16.44 $\pm$ 0.03 14.69 $\pm$ 0.11 -1.67 $\pm$ 0.18 $\rm0.061^{+0.07 }_{-0.017}$   D
S Ori 25 05 39 08.95 -02 39 58.0 16.95 $\pm$ 0.03 14.70 $\pm$ 0.10 -1.70 $\pm$ 0.18 $\rm0.058^{+0.07 }_{-0.016}$ M6.5 $\pm$ 0.5 Y
S Ori J053954.3-023719 05 39 54.33 -02 37 18.9 16.79 $\pm$ 0.03 14.77 $\pm$ 0.07 -1.72 $\pm$ 0.18 $\rm0.056^{+0.06 }_{-0.015}$ M6.0 $\pm$ 1.0 (D)
S Ori J053844.4-024037 05 38 44.48 -02 40 37.6 17.17 $\pm$ 0.03 14.78 $\pm$ 0.08 -1.72 $\pm$ 0.18 $\rm0.056^{+0.06 }_{-0.015}$   D
S Ori J053826.1-024041 05 38 26.23 -02 40 41.4 16.95 $\pm$ 0.02 14.81 $\pm$ 0.07 -1.74 $\pm$ 0.18 $\rm0.054^{+0.06 }_{-0.014}$ M5.0 $\pm$ 2.0 Y
S Ori 20 05 39 07.58 -02 29 05.6 16.80 $\pm$ 0.03 14.83 $\pm$ 0.10 -1.75 $\pm$ 0.18 $\rm0.054^{+0.06 }_{-0.014}$ M5.5 $\pm$ 0.5  
S Ori J053829.0-024847 05 38 28.97 -02 48 47.3 16.81 $\pm$ 0.02 14.84 $\pm$ 0.09 -1.75 $\pm$ 0.18 $\rm0.053^{+0.06 }_{-0.014}$ M6.0 $\pm$ 0.5 D
S Ori 27 05 38 17.42 -02 40 24.3 17.05 $\pm$ 0.03 14.92 $\pm$ 0.08 -1.79 $\pm$ 0.18 $\rm0.050^{+0.06 }_{-0.013}$ M6.5 $\pm$ 0.5 Y
S Ori J053825.4-024241 05 38 25.44 -02 42 41.3 16.87 $\pm$ 0.02 14.95 $\pm$ 0.07 -1.79 $\pm$ 0.18 $\rm0.050^{+0.06 }_{-0.012}$ M6.0 $\pm$ 1.0 Y,D
S Ori 28 05 39 23.19 -02 46 55.8 17.14 $\pm$ 0.03 15.12 $\pm$ 0.16 -1.86 $\pm$ 0.18 $\rm0.046^{+0.05 }_{-0.012}$   Y
S Ori 31 05 38 20.88 -02 46 13.3 17.23 $\pm$ 0.02 15.18 $\pm$ 0.09 -1.89 $\pm$ 0.18 $\rm0.044^{+0.04 }_{-0.011}$ M7.0 $\pm$ 0.5  
S Ori J053922.2-024552 05 39 22.25 -02 45 52.4 17.04 $\pm$ 0.03 15.20 $\pm$ 0.15 -1.89 $\pm$ 0.18 $\rm0.044^{+0.04 }_{-0.011}$    
S Ori 30 05 39 13.08 -02 37 50.9 17.29 $\pm$ 0.03 15.20 $\pm$ 0.07 -1.90 $\pm$ 0.18 $\rm0.044^{+0.04 }_{-0.011}$ M6.0 $\pm$ 0.5 D
S Ori 32 05 39 43.59 -02 47 31.8 17.33 $\pm$ 0.03 15.34 $\pm$ 0.05 -1.95 $\pm$ 0.18 $\rm0.041^{+0.04 }_{-0.011}$   Y
S Ori J053855.4-024121 05 38 55.42 -02 41 20.8 18.59 $\pm$ 0.04 15.38 $\pm$ 0.10 -1.88 $\pm$ 0.18 $\rm0.045^{+0.05 }_{-0.011}$   D,New
S Ori J054004.5-023642 05 40 04.54 -02 36 42.1 17.50 $\pm$ 0.03 15.39 $\pm$ 0.07 -1.97 $\pm$ 0.18 $\rm0.039^{+0.04 }_{-0.010}$   Y,D
S Ori 36 05 39 26.85 -02 36 56.2 17.68 $\pm$ 0.03 15.40 $\pm$ 0.07 -1.97 $\pm$ 0.18 $\rm0.039^{+0.04 }_{-0.010}$   Y,D
S Ori J053854.9-024034 05 38 54.92 -02 40 33.8 18.71 $\pm$ 0.04 15.69 $\pm$ 0.10 -2.02 $\pm$ 0.18 $\rm0.037^{+0.03 }_{-0.009}$   D,New
S Ori J053918.1-025257 05 39 18.13 -02 52 56.3 18.64 $\pm$ 0.04 16.12 $\pm$ 0.08 -2.25 $\pm$ 0.18 $\rm0.028^{+0.012}_{-0.007}$   D
S Ori 42 05 39 23.41 -02 40 57.6 19.05 $\pm$ 0.03 16.49 $\pm$ 0.10 -2.39 $\pm$ 0.18 $\rm0.025^{+0.006}_{-0.010}$ M7.5 $\pm$ 0.5 Y,D
S Ori 45 05 38 25.58 -02 48 37.0 19.48 $\pm$ 0.02 16.73 $\pm$ 0.07 -2.47 $\pm$ 0.18 $\rm0.023^{+0.006}_{-0.010}$ M8.5 $\pm$ 0.5 Y
S Ori J053929.4-024636 05 39 29.38 -02 46 36.5 19.75 $\pm$ 0.03 16.96 $\pm$ 0.16 -2.56 $\pm$ 0.18 $\rm0.021^{+0.005}_{-0.010}$    
S Ori 51 05 39 03.22 -02 30 20.7 20.22 $\pm$ 0.03 17.06 $\pm$ 0.12 -2.55 $\pm$ 0.18 $\rm0.021^{+0.005}_{-0.010}$ M9.0 $\pm$ 0.5 Y
S Ori 71 05 39 00.30 -02 37 06.7 20.03 $\pm$ 0.03 17.23 $\pm$ 0.07 -2.67 $\pm$ 0.18 $\rm0.019^{+0.005}_{-0.010}$ L0.0 $\pm$ 0.5 Y,D
S Ori J053849.5-024934 05 38 49.59 -02 49 33.3 20.08 $\pm$ 0.02 17.30 $\pm$ 0.08 -2.70 $\pm$ 0.18 $\rm0.018^{+0.005}_{-0.010}$   D
S Ori 47 05 38 14.62 -02 40 15.4 20.49 $\pm$ 0.02 17.37 $\pm$ 0.08 -2.68 $\pm$ 0.18 $\rm0.019^{+0.005}_{-0.010}$ L1.5 $\pm$ 0.5  
S Ori 50 05 39 10.81 -02 37 15.1 20.48 $\pm$ 0.03 17.50 $\pm$ 0.07 -2.75 $\pm$ 0.18 $\rm0.017^{+0.005}_{-0.009}$ M9.0 $\pm$ 0.5  
S Ori 53 05 38 25.12 -02 48 02.7 20.93 $\pm$ 0.02 17.92 $\pm$ 0.06 -2.92 $\pm$ 0.18 $\rm0.014^{+0.005}_{-0.008}$ M9.0 $\pm$ 0.5  
S Ori J053944.5-025959 05 39 44.55 -02 59 58.9 20.74 $\pm$ 0.04 18.04 $\pm$ 0.08 -3.00 $\pm$ 0.18 $\rm0.013^{+0.005}_{-0.007}$    
S Ori J054007.0-023604 05 40 06.95 -02 36 04.7 21.14 $\pm$ 0.03 18.22 $\pm$ 0.07 -3.05 $\pm$ 0.18 $\rm0.012^{+0.005}_{-0.007}$    
S Ori J053956.8-025315 05 39 56.83 -02 53 14.4 21.25 $\pm$ 0.04 18.27 $\pm$ 0.08 -3.06 $\pm$ 0.18 $\rm0.012^{+0.005}_{-0.007}$    
S Ori J053858.6-025228 05 38 58.55 -02 52 26.7 22.19 $\pm$ 0.05 18.61 $\pm$ 0.08 -3.12 $\pm$ 0.18 $\rm0.011^{+0.005}_{-0.006}$    
S Ori J053949.5-023130 05 39 49.52 -02 31 29.8 22.04 $\pm$ 0.04 18.89 $\pm$ 0.10 -3.29 $\pm$ 0.18 $\rm0.008^{+0.005}_{-0.004}$   New
S Ori 60 05 39 37.50 -02 30 41.9 22.52 $\pm$ 0.05 19.05 $\pm$ 0.10 -3.31 $\pm$ 0.18 $\rm0.008^{+0.005}_{-0.004}$ L2.0 $\pm$ 1.0  
S Ori 62 05 39 42.05 -02 30 32.3 22.52 $\pm$ 0.05 19.18 $\pm$ 0.10 -3.38 $\pm$ 0.18 $\rm0.008^{+0.005}_{-0.004}$ L2.0 $\pm$ 1.5  
S Ori J053844.5-025512 05 38 44.56 -02 55 12.4 22.77 $\pm$ 0.06 19.31 $\pm$ 0.08 -3.42 $\pm$ 0.18 $\rm0.007^{+0.005}_{-0.004}$    
S Ori J054008.5-024551 05 40 08.49 -02 45 50.3 22.80 $\pm$ 0.07 19.43 $\pm$ 0.16 -3.48 $\pm$ 0.18 $\rm0.007^{+0.005}_{-0.004}$    
S Ori J053932.4-025220 05 39 32.42 -02 52 20.3 22.83 $\pm$ 0.07 19.54 $\pm$ 0.08 -3.53 $\pm$ 0.18 $\rm0.007^{+0.004}_{-0.003}$    
S Ori J054011.6-025135 05 40 11.58 -02 51 34.6 22.95 $\pm$ 0.07 19.69 $\pm$ 0.09 -3.59 $\pm$ 0.18 $\rm0.006^{+0.004}_{-0.003}$   New
a Entries for which there is a clear spectroscopic youth indicator or evidence of disc, or are firstly identified in this work are marked by "Y'', "D'', and "New'', respectively.

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