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Table 3

Astrometric calibration results using the binary HIP 73357.

JD−2 453 700 Epoch Pixel scale Orientation Filter
 [days]  [mas/pixel] [°]

88.84779 Feb. 2006 13.24  ±  0.18 0.18  ±  1.24 Ks
460.84330 Mar. 2007 13.24  ±  0.19 0.33  ±  1.32 Ks
815.91117 Feb. 2008 13.22  ±  0.20 0.73  ±  1.40 J
815.91907 Feb. 2008 13.25  ±  0.20 0.68  ±  1.40 Ks
1181.89936 Feb. 2009 13.25  ±  0.21 0.76  ±  1.48 Ks
1550.82276 Feb. 2010 13.24  ±  0.22 0.72  ±  1.56 Ks
1854.54334 Dec. 2010a 13.23  ±  0.23 0.95  ±  1.63 Ks
1945.86023 Mar. 2011 13.24  ±  0.24 1.00  ±  1.65 Ks

Notes. The values of Hipparcos (Perryman et al. 1997) were used as reference values. Measurement errors of Hipparcos as well as maximum possible orbital motion since the epoch of the Hipparcos observation are taken into account.

(a)

Although HIP 73357 was not observed in Dec. 2010, HIP 6445, observed in Feb. 2010 and Dec. 2010, could be used to transfer the HIP 73357 calibration to Dec. 2010.

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