Relation between a Function of the Right Ascension and the Angular Distance to the Vertex for Hyades Stars

Abstract. In this paper, relation was developed for Hyades stars between a function of the right ascensions and the angular distances from the vertex. The precision criteria of this relation are very satisfactory and a correlation coefficient value of 1 was found which proves that the attributes are completely related linearly. The importance of this relation was illustrated through its usages as: • a criterion for membership of the cluster, • a generating function for evaluating some parameters of the cluster, • a generating function for the initial values of the vertex equatorial coor-dinates which could then be improved iteratively using the procedure of differential corrections. Key words. Moving clusters—Hyades cluster—open clusters—Hyades astrometric and kinematic. 1