This pages provide data of successive realizations of the International Celestial Reference Frame (ICRF) by VLBI. Please, refer to the article (link to ADS) or to the ReadMe files for more informations on each realization.
ICRF3The ICRF3 was adopted as the new fundamental celestial reference frame by the IAU during its XXXth General Assembly in Vienna, 30 August 2018, replacing the ICRF2 as of 1 January 2019. | ||||
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Data at S/X Data at K Data at X/Ka |
Charlot et al. (2020) |
  
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4,536 objects at S/X 824 objects at K 678 objects at X/Ka | |
ICRF2 | ||||
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Data |
Fey et al. (2015) |
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3,414 objects | |
ICRF1 Extension 2 | ||||
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Data |
Fey et al. (2004) |
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717 objects | |
ICRF1 Extension 1 | ||||
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Data |
Gontier et al. (2002) |
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667 objects | |
ICRF1 | ||||
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Data |
Ma et al. (1998) |
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608 objects | |