All Figures

	Figure 1: Narrow-band image of HIP 28442 at 2.12 m. The components are marked by capital letters.
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In the text

	Figure 2: The visual orbit of the A,B sub-system. The A-component is marked by the star at the coordinate origin, the measured positions of the B-component are joined to ephemeris' locations.
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In the text

	Figure 3: The apparent motion of AB,CE. The relative positions of the centers-of mass CE are plotted as squares, the center of mass AB is marked by a large star at coordinate origin, the small ellipse shows the motion of A around AB. The dotted line is the orbit of Baize (1980), the full line is the quadraric ephemeris (1).
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In the text

	Figure 4: Deviations of the relative positions of AB,C from the ephemeride (1) in x ( upper) and y ( lower). The full line depicts the proposed astrometric orbit, the observations are plotted by pluses,the last observation is marked by a rectangle. A typical error bar of 70 mas is shown.
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In the text

	Figure 5: Four components on the (K,J-K) color-magnitude diagram. The error bars of all components except E are smaller than the symbol size. The standard Main Sequence from Lang (1992) is shown by a line, the crosses mark dwarf stars from Henry & McCarthy (1993).
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In the text