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Table 13.

Parameters of the transformations between ICRF3 (S/X band catalog) and other frames, including rotation, glide (dipole terms), and quadrupole terms (all in microarcseconds), plus the number of sources involved in the calculations.

Reference frame
ICRF3 catalog
Parameters ICRF2 ICRF2GA Gaia-CRF2 K band X/Ka band
Nb sources
  common 3414 3414 2983 793 638
  outliers 496 382 371 25 82
  used 2918 3032 2612 768 556
Rotation
  R1 8 ± 4 16 ± 4 −22 ± 8 3 ± 8 −22 ± 8
  R2 15 ± 4 19 ± 4 23 ± 8 −10 ± 8 3 ± 8
  R3 0 ± 3 −5 ± 3 −5 ± 7 −6 ± 4 4 ± 5
Glide (dipole)
  D1 −22 ± 4 −18 ± 3 −13 ± 8 8 ± 7 1 ± 7
  D2 −63 ± 4 4 ± 3 −4 ± 8 −36 ± 7 −32 ± 7
  D3 −90 ± 4 −39 ± 4 12 ± 8 −19 ± 8 314 ± 8
Quadrupole
  E20 43 ± 4 39 ± 4 35 ± 9 16 ± 9 −75 ± 10
  M20 5 ± 4 3 ± 3 1 ± 8 31 ± 6 −207 ± 7
   −11 ± 5 −13 ± 4 9 ± 10 20 ± 8 34 ± 9
   3 ± 5 −2 ± 4 13 ± 10 51 ± 9 −35 ± 9
   −1 ± 4 −1 ± 4 −3 ± 10 −16 ± 8 −2 ± 8
   −5 ± 4 −6 ± 4 6 ± 10 25 ± 9 8 ± 9
   1 ± 2 −1 ± 2 1 ± 5 8 ± 3 6 ± 3
   3 ± 2 2 ± 2 2 ± 5 7 ± 3 −3 ± 4
   −3 ± 2 −1 ± 2 3 ± 5 −12 ± 4 7 ± 5
   2 ± 2 1 ± 2 −5 ± 5 5 ± 4 −7 ± 5

Notes. ICRF2GA denotes the equivalent of ICRF2 that was reproduced after incorporating Galactic acceleration in the modeling.

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