Author/Authors :
A.-M. Gontier، نويسنده , , C. Ma، نويسنده , , E.F. Arias، نويسنده , , T.M. Eubanks، نويسنده , , A.L. Fey، نويسنده , , C.S. Jacobs، نويسنده , , O.J. Sovers، نويسنده , , B.A. Archinal، نويسنده , , P. Charlot، نويسنده ,
Abstract :
The International Celestial Reference Frame, is the basis for measurements from space geodesy and astrometry. It is defined by the positions of compact extragalactic radio sources measured by Very Long Baseline Interferometry and became the fundamental celestial reference frame as of 1 Jan 1998 after a lengthy, carefully conceived process of the International Astronomical Union. The construction of the International Celestial Reference Frame is discussed as well as its first extension issued in 1999.
