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Table 1

Reference stars used for the relative photometry.

Star No. Identifier (2MASS) K magnitude

1 J23161168+3121302 9.743
2 J23152988+3124545 10.242
3 J23153263+3125204 11.277
4 J23154185+3125453 11.351
5 J23160820+3123526 11.311
6 J23161623+3125394 11.374
7 J23161550+3124310 10.182
8 J23162393+3126136 10.822
9 J23153719+3129053 11.059
10 J23155269+3127250 11.439
11 J23161392+3129131 10.611
12 J23162371+3128547 10.468
13 J23162211+3131385 8.295

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