Abstract
One of the main objects of fundamental astronomy is the determination of the celestial reference frames. The reference frames must approximate the inertial system with great accuracy. Positions of the celestial bodies can not be obtained directly from the reference system so it is necesary to built star catalogues, which materialize the reference system. The positions of the celestial bodies can be obtained from them by comparisson of the body position with the stars coorditates taken from the cataloges. The reference frame in use nowadays was adopted in Kyoto by International Astronomical Union and their main caracteristics are: a.-From the first of Jaunary 1998 the Celestial Reference System adopted by I.A.U. will be The International Celestial Reference system (ICRS) defined by the International Earth Rotation Service. b.-The corresponding Reference Frame will be the International Celestial Reference Frame (ICFR) build for the corresponding workgroup of the I.A.U. c.- The Hipparcos Catalogue is the materialization of this reference frame for visible wavelenghts. d.-The IERS , and the IAU working group will take the apropiated measures for their maitenance of the ICRF and the relations with the other reference frames.
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