Table 3: Relative astrometry and photometry for the $\theta ^1$Ori C binary system.
              (O-C) Orbit #1   (O-C) Orbit #2
Telescope Date Filter Flux ratio $\Theta^a$ $\rho$ Ref. $\Theta$ $\rho$   $\Theta$ $\rho$
      $F_{\rm C2}/F_{\rm C1}$ [$^\circ $] [mas]   [$^\circ $] [mas]   [$^\circ $] [mas]
BTA 6 m/Speckle 1997.784 H $0.26 \pm 0.02$ $226.0 \pm 3$ $33 \pm 2$ b +3.0 +0.0   +3.0 +0.5
BTA 6 m/Speckle 1998.838 K' $0.32 \pm 0.03$ $222.0 \pm 5$ $37 \pm 4$ b +3.8 -2.6   +3.8 -2.5
BTA 6 m/Speckle 1999.737 J $0.31 \pm 0.02$ $214.0 \pm 2$ $43 \pm 1$ c -0.9 +1.5   -0.9 +1.5
BTA 6 m/Speckle 1999.8189 G' $0.35 \pm 0.04$ $213.5 \pm 2$ $42 \pm 1$ - -1.1 +0.5   -1.1 +0.5
BTA 6 m/Speckle 2000.8734 V' $0.35 \pm 0.03$ $210.0 \pm 2$ $40 \pm 1$ - -0.8 -0.8   -0.9 -0.8
BTA 6 m/Speckle 2001.184 J $0.29 \pm 0.02$ $208.0 \pm 2$ $38 \pm 1$ c -1.6 -2.1   -1.7 -2.1
BTA 6 m/Speckle 2003.8 J $0.30 \pm 0.02$ $199.3 \pm 2$ $29 \pm 2$ - +3.9 +0.5   +2.8 +0.5
BTA 6 m/Speckle 2003.9254 V' - $199.0 \pm 2$ $29 \pm 2$ - +3.6 +1.3   +3.4 +1.3
BTA 6 m/Speckle 2003.928 V' - $199.1 \pm 2$ $29 \pm 2$ - +3.8 +1.3   +3.6 +1.3
BTA 6 m/Speckle 2004.8216 V' $0.34 \pm 0.04$ $190.5 \pm 4$ $24 \pm 4$ - +4.2 +2.4   +4.0 +2.4
IOTA 2005.92055 H $0.28 \pm 0.03$ $162.74 \pm 2$ $13.55 \pm 0.5$ - -0.5 +0.0   -1.0 +0.0
BTA 6 m/Speckle 2006.8 V', R - - <15 - - -   - -
a Following the convention, we measure the position angle (PA) from north to east.
References - b Weigelt et al. (1999), c Schertl et al. (2003).


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