**Table 3:** Astrometric calibration and astrometric results for Cha H $\alpha$ 2 AB.
JD - 2453400	Calibration	Pixel scale	Orientation	JD - 2 453 400	Target	Separation	PA (a)
$[{\rm days}]$	binary	[mas/pixel]	[ $\deg$ ]	[days]		[mas]	[ $\deg$ ]
54.76919	HIP 73111	13.22 $\pm$ 0.28	-0.17 $\pm$ 1.84	54.62360	Cha H $\alpha$ 2 AB	165.7 $\pm$ 3.7	40.16 $\pm$ 1.84
388.84537	HIP 73357	13.24 $\pm$ 0.07	0.18 $\pm$ 0.46	382.67884	Cha H $\alpha$ 2 AB	167.0 $\pm$ 1.4	41.01 $\pm$ 0.47
760.76369	HIP 73357	13.24 $\pm$ 0.07	0.34 $\pm$ 0.46	760.70760	Cha H $\alpha$ 2 AB	158.0 $\pm$ 1.8	39.73 $\pm$ 0.50

Remarks: All Ks-band images. (a) PA is measured from N over E to S. 180 $\deg$ to be added
to position angle (PA) if seen from fainter component.

Source LaTeX | All tables | In the text