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The International Celestial Reference Frame (ICRF)

The International Celestial Reference Frame (ICRF) realizes an ideal reference system, the International Celestial Reference System (ICRS), by precise equatorial coordinates of extragalactic radio sources observed in Very Long Baseline Interferometry (VLBI) programmes.

ContentsEquatorial coordinates of 608 extragalactic radio sources in J2000.0 observed with VLBI.
Accuracy

Uncertainties are given in the file.

R.A. [s]0.000017 - 0.092072
Dec. ["]0.00026 - 0.9467
Updates
  • First maintenance and extension of the ICRF (ICRF-Ext.1)
  • Second maintenance and extension of the ICRF (ICRF-Ext.2)
  • 2nd realization of the ICRF (ICRF2)
  • 3rd realization of the ICRF (ICRF3)
Public accesshttp://hpiers.obspm.fr/icrs-pc/newwww/index.php
FormatFor format description see contents of the data file.
Documentation
Product CentreIERS ICRS Centre

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