Table 3
Global differences between the Gaia-CRF2 positions of ICRF sources and their positions in the ICRF3-prototype, expressed by the orientation and glide parameters.
| Orientation (μas) | Glide (μas) | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fit | Source selection | W | lmax | N | x | y | z | x | y | z | ||||||||
| 1 | all | y | 1 | 2820 | − 9 ± | 29 | 4 ± | 27 | 3 ± | 28 | – | – | – | |||||
| 2 | all | y | 1 | 2820 | − 28 ± | 31 | − 8 ± | 29 | 10 ± | 28 | 47 ± | 29 | − 69 ± | 28 | − 72 ± | 29 | ||
| 3 | ρ < 10 mas | y | 1 | 2773 | − 17 ± | 16 | 22 ± | 15 | − 23 ± | 16 | – | – | – | |||||
| 4 | ρ < 2 mas | y | 1 | 2423 | − 35 ± | 9 | 21 ± | 8 | − 24 ± | 9 | – | – | – | |||||
| 5 | ρ < 2 mas | n | 1 | 2423 | − 13 ± | 14 | 5 ± | 14 | − 5 ± | 13 | – | – | – | |||||
| 6 | ρ < 2 mas | y | 5 | 2423 | − 47 ± | 12 | 30 ± | 10 | 0 ± | 11 | 2 ± | 12 | − 40 ± | 10 | − 25 ± | 11 | ||
| 7 | ρ < 1 mas | y | 5 | 1932 | − 47 ± | 10 | 12 ± | 9 | − 10 ± | 9 | − 2 ± | 10 | − 42 ± | 9 | − 18 ± | 9 | ||
| 8 | ρ < 1 mas | n | 5 | 1932 | − 15 ± | 12 | 2 ± | 12 | − 14 ± | 11 | − 6 ± | 12 | 1 ± | 12 | 11 ± | 11 | ||
| 9 | ρ < 2 mas, G < 19 | y | 5 | 1382 | − 57 ± | 16 | 33 ± | 13 | 9 ± | 14 | 3 ± | 15 | − 48 ± | 13 | − 24 ± | 14 | ||
| 10 | ρ < 2 mas, G < 19 | n | 5 | 1382 | − 65 ± | 20 | 0 ± | 18 | 22 ± | 17 | 5 ± | 20 | − 30 ± | 18 | 24 ± | 17 | ||
| 11a | ρ < 2 mas, ⌊105α⌋ mod 2 = 0 | y | 5 | 1255 | − 19 ± | 18 | 34 ± | 15 | − 10 ± | 16 | 28 ± | 17 | − 10 ± | 15 | − 22 ± | 16 | ||
| 11b | ρ < 2 mas, ⌊105α⌋ mod 2 = 1 | y | 5 | 1168 | − 61 ± | 17 | 33 ± | 15 | 17 ± | 15 | − 31 ± | 17 | − 64 ± | 15 | − 18 ± | 15 | ||
Notes. ρ is the angular separation between the optical and radio positions. N is the number of sources used in the fit. W = “y” or “n”for weighted or unweighted solution. The weighted solutions use a non-diagonal weight matrix resulting from the combination of Gaia covariances and the covariances from the ICRF3-prototype. lmax is the highest degree of the fit from which orientation and glide are extracted for l = 1. The columns headed x, y, z give the components of the orientation and glide along the principal axes of the ICRS.
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