The impact of improved estimates of radio star astrometric models on the alignment of the Gaia bright reference frame to ICRF3

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Volume 689 (September 2024)

A&A, 689 (2024) A134

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Table 4

WM, WRMS, and ME of the rotation parameters for various scenarios.

Scenario		ϵ_X	ϵ_Y	ϵ_Z	ω_X	ω_Y	ω_Z
55,EDR3	WM_55,EDR3	0.294	0.340	0.077	0.034	0.055	−0.020
	WRMS_55,EDR3	0.049	0.074	0.084	0.016	0.014	0.012
	ME_55,EDR3	0.079	0.099	0.060	0.011	0.013	0.012

55,EDR3,GA	WM_55,EDR3,GA	0.289	0.343	0.078	0.031	0.053	−0.017
	WRMS_55,EDR3,GA	0.048	0.074	0.083	0.016	0.014	0.012
	ME_55,EDR3,GA	0.078	0.099	0.060	0.011	0.013	0.012

50,EDR3,GA	WM_50,EDR3,GA	0.315	0.327	0.069	0.037	0.037	−0.004
	WRMS_50,EDR3,GA	0.028	0.041	0.085	0.014	0.007	0.011
	ME_50,EDR3,GA	0.081	0.102	0.061	0.012	0.014	0.012

55,EDR3,GA,NM	WM_{55,EDR3,GA,NM}	0.305	0.376	0.065	0.029	0.064	−0.014
	WRMS_{55,EDR3,GA,NM}	0.062	0.081	0.082	0.010	0.013	0.014
	ME_{55,EDR3,GA,NM}	0.092	0.115	0.068	0.010	0.012	0.010

49,EDR3,GA,NM	WM_{49,EDR3,GA,NM}	0.267	0.479	0.080	0.025	0.043	0.005
	WRMS_{49,EDR3,GA,NM}	0.038	0.047	0.078	0.008	0.006	0.005
	ME_{49,EDR3,GA,NM}	0.099	0.123	0.072	0.011	0.014	0.011

60,EDR3,GA,NM	WM_{60,EDR3,GA,NM}	0.347	0.360	0.060	0.031	0.065	−0.016
	WRMS_{60,EDR3,GA,NM}	0.114	0.080	0.078	0.011	0.012	0.014
	ME_{60,EDR3,GA,NM}	0.090	0.112	0.067	0.010	0.011	0.010

53,EDR3,GA,NM	WM_{53,EDR3,GA,NM}	0.282	0.458	0.100	0.025	0.041	0.006
	WRMS_{53,EDR3,GA,NM}	0.046	0.054	0.100	0.009	0.009	0.008
	ME_{53,EDR3,GA,NM}	0.098	0.122	0.071	0.011	0.014	0.011

Notes. The order of the scenarios is according to their appearance in the main text. For the calculation of the statistics iterations 12 to 47 were used for all scenarios including 55 stars, while iterations 11 to 42 were used for the scenario “50,EDR3,GA”, 11 to 41 for the scenario “49,EDR3,GA,NM”, 11 to 52 for the scenario “60,EDR3,GA,NM”, and 11 to 45 for the scenario “53,EDR3,GA,NM”. For the derivation of the ME values the last 10 iterations were also rejected, as standard deviations of the rotation parameters increase substantially if only few stars are available for the calculation. Units are milliarcseconds for ϵ_X, ϵ_Y, and ϵ_Z and milliarcseconds per year for ω_X, ω_Y, and ω_Z.

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