Table 1: Overview of all observations of Gliese 22 AC used for the visual orbit determination in this paper. Except for the first two data points all observations have been carried out at the 3.5-m telescope on Calar Alto.
No. Date Epoch Position Projected Weight Filter Flux ratio Instrument
      angle [$^{\circ}$] separation [mas]     $F_{{\rm C}}/F_{{\rm A}}$ (or reference)
1 12.10.1989 1989.7803 42.7 $\pm$ 2.5 451 $\pm$ 20 4 K 0.167 $\pm$ 0.009 McCarthy et al. (1991)
2 10.12.1989 1989.9418 43.9 $\pm$ 2.5 453 $\pm$ 20 4 H 0.143 $\pm$ 0.008 McCarthy et al. (1991)
3 11.09.1990 1990.6954 57.1 $\pm$ 6.3 405 $\pm$ 39 5 K   1D
4 20.09.1991 1991.7201 71.6 $\pm$ 1.6 443 $\pm$ 13 5 K   1D
5 30.09.1993 1993.7474 122.5 $\pm$ 0.5 464 $\pm$ 11 7 K 0.151 $\pm$ 0.004 MAGIC
6 28.01.1994 1994.0767 129.3 $\pm$ 4.3 478 $\pm$ 40 10 K   MAGIC
7 15.09.1994 1994.7064 141.1 $\pm$ 0.4 510 $\pm$ 5 9 K 0.141 $\pm$ 0.007 MAGIC
8 13.12.1994 1994.9501 145.2 $\pm$ 0.2 532 $\pm$ 5 9 K   MAGIC
9 08.10.1995 1995.7693 157.5 $\pm$ 1.7 526 $\pm$ 16 9 K 0.158 $\pm$ 0.004 MAGIC
10 28.09.1996 1996.7448 172.1 $\pm$ 0.2 533 $\pm$ 4 10 K 0.141 $\pm$ 0.004 MAGIC
11 17.11.1997 1997.8789 190.2 $\pm$ 0.3 460 $\pm$ 4 7 K 0.171 $\pm$ 0.008 MAGIC
12 09.02.2001 2001.1095 302.3 $\pm$ 0.3 334 $\pm$ 4 9 K 0.185 $\pm$ 0.005 OMEGA Cass
13 03.11.2001 2001.8406 325.5 $\pm$ 0.5 402 $\pm$ 6 8 K 0.151 $\pm$ 0.011 OMEGA Cass
14 19.10.2002 2002.7994 348.2 $\pm$ 0.4 463 $\pm$ 5 9 K 0.150 $\pm$ 0.005 OMEGA Cass


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