Orbits for Eight Binaries

Abstract

The subject of the present paper is the analysis of the orbital solutions for eight binaries: WDS 02402+0436 = HDS 347, WDS 02552+5950 = MLR 520, WDS 03119+6131 = HDS 407, WDS 04570+7350 = YSC 145, WDS 05202+4105 = HDS 701, WDS 06467+0822 = HDS 940AB, WDS 08259-1623 = HDS 1199, and WDS 22550+5132 = HU 785. Seven orbits are determined for the first time, and the remaining orbit is a revision. The five binaries are HDS, discovered during the Hipparcos mission, two binaries were discovered before, 1902 and 1974, and one binary was discovered afterwards, 2009. All measured separations are less than 1 arcsecond, and in most studied pairs they are less than 0.4 arcseconds. The number of measurements is relatively small, from 9 to 16, except for one pair which has only been measured six times so far. The median orbital period is 95.1 yr, the shortest period is 12.5 yr, and the longest period is 362.7 yr. In addition to the orbital elements, we also give absolute magnitudes, spectral types, estimates of the masses, dynamical parallaxes, and $(O-C)$ residuals in θ and ρ.