It was superseded by the quasar - based International Celestial Reference Frame ( ICRF ) .
The Fifth Fundamental Catalogue ( FK5 ) was a 1988 update of FK4 with new positions for the 1,535 stars .
Fifth Fundamental Catalogue was superseded by the quasar - based International Celestial Reference Frame ( ICRF ) .
The Fifth Fundamental Catalogue ( FK5 ) was a 1988 update of FK4 with new positions for the 1,535 stars .