Table 4: Photometry on GQ Lupi with VLT/NACO.
Epoch Diff. (a) $K_{\rm s}$ band magnitude [mag]
year HIP A-B GQ Lupi A GQ Lupi b cc2 (b)
2005.40 $1.56 \pm 0.07$ $7.07 \pm 0.07$ $13.46 \pm 0.12$ $14.80 \pm 0.24$
2005.60 $1.46 \pm 0.13$ $7.04 \pm 0.14$ $13.34 \pm 0.42$ $14.78 \pm 0.18$
2006.14 $1.57 \pm 0.08$ $7.09 \pm 0.08$ $13.38 \pm 0.10$ $14.88 \pm 0.16$
2006.38 $1.59 \pm 0.07$ $7.40 \pm 0.08$ $13.47 \pm 0.14$ $14.87 \pm 0.26$
2006.54 $1.66 \pm 0.12$ $7.02 \pm 0.13$ $13.45 \pm 0.38$ $15.07 \pm 0.34$
2007.13 $1.54 \pm 0.16$ $7.48 \pm 0.16$ $13.27 \pm 0.12$ $15.67 \pm 0.92$
mean $1.56 \pm 0.07$ $7.18 \pm 0.20$ $13.39 \pm 0.08$ $15.01 \pm 0.33$

Remarks: (a) difference in $K_{\rm s}$ between HIP 73357 A and B. (b) background object GQ Lupi/cc2.

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