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Table C.1:

Near-infrared photometry and its associated errors from the fourth data release of the GCS for previously known members of $\sigma $ Orionis.
RAa Dec.a Z Y J H K $\mu_{\alpha}\cos{\delta}$ $\mu_{\delta}$ Commentsb
h:m:s d:$^\prime$: $^{\prime\prime}$ mag mag mag mag mas/yr mas/yr    
05:36:46.91 -02:33:28.3 14.636 $\pm$ 0.003 14.086 $\pm$ 0.002 13.474 $\pm$ 0.002 12.927 $\pm$ 0.002 12.644 $\pm$ 0.002 8.1 -5.5 M1773275
05:36:58.07 -02:35:19.4 16.457 $\pm$ 0.009 15.691 $\pm$ 0.006 15.043 $\pm$ 0.006 14.540 $\pm$ 0.005 14.174 $\pm$ 0.006 -7.3 -3.0 M1599271
... ... ... ... ... ... ... ... ... ...
05:40:09.32 -02:26:32.6 19.484 $\pm$ 0.085 18.304 $\pm$ 0.039 17.392 $\pm$ 0.027 16.878 $\pm$ 0.039 16.209 $\pm$ 0.032 - - SOri 52
05:40:13.96 -02:31:27.4 16.295 $\pm$ 0.008 15.272 $\pm$ 0.005 14.492 $\pm$ 0.004 14.034 $\pm$ 0.004 13.560 $\pm$ 0.003 5.9 -4.1 KJN63
05:40:34.40 -02:44:09.5 14.951 $\pm$ 0.004 14.291 $\pm$ 0.003 13.681 $\pm$ 0.003 13.155 $\pm$ 0.002 12.777$\pm$0.002 -5.9 8.3 BNLJ63
a Coordinates in J2000 from the UKIDSS GCS DR4. b Names in the last column are as follows: M stands for the Mayrit catalogue (Caballero 2008c), KJN for members in Kenyon et al. (2005), BNLJ for objects in Table 3 of Burningham et al. (2005), and SOri nomenclature comes from the work by Béjar et al. (1999), Zapatero Osorio et al. (2000), and Béjar et al. (2001a). Four sources are spectroscopic binaries (M258337, M459224, M873229, M1493050; Maxted et al. 2008) and three (S36, S42, S97) are classified as non-members by Sacco et al. (2008).

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