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The IERS extragalactic Celestial Reference Frame and its tie with HIPPARCOS.

Lestrade, J. -F.; Arias, E. F.; Feissel, M.

This Technical Note gives a presentation of analyses of VLBI extragalactic reference frames performed in the framework of IERS, in the course of the maintenance of its conventional celestial frame. In section 1 the definition of the IERS celestial reference system and its relationship with the 1991 IAU Resolution A4 on Reference Systems are descri…