Interferometric Orbits of New Hipparcos Binaries by I.I.Balega, Y.Y.Balega, R.-H.Hofmann, E.V.Malogolovets, E.A.Pluzhnik, D.Schertl, Z.U.Shkhagosheva and G.Weigelt Starting from 1998 the precise relative positions and magnitude differences have been measured by speckle interferometry for almost 200 new nearby (pi > 10 mas) binaries discovered by Hipparcos astrometric satellite. The main volume of the measurements was collected by our team at the Zelenchuk 6 m telescope and by E.P.Horch et al. at the WIYN 3.5 m telescope in USA. Today the orbital parameters can be estimated for approximately 20 new Hipparcos pairs. We present new orbits for 12 systems from the list. Five pairs belong to nearby K and M dwarfs, while seven others are late F to late G type stars. One of the systems, HIP 4809, has evolved G8IV components. The periods of the orbiting systems are distributed in the range from 5 to 29 years. Due to high accuracy of speckle measurements, typically 1 - 3 mas, most of the orbits can be considered as definitive despite the small number of measurements. However, the mass sums error rate is relatively high, between 10 and 30 percent. The main source of the total mass error remains the Hipparcos parallax error. In the near future the physical properties of of the components under study will be specified using the high-resolution spectroscopy data from the 6 m telescope.