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 1

Absolute positions in ICRF3 for 14 stars based on observations conducted in January 2020 and analysis including the modeling of the phase calibrator structure.

Star	Calibrator	∆_c	Epoch t	α (t)	σ_α*,random	δ (t)	σ_δ,random
		[º]	(Julian year)	[º]	(mas)	[°]	(mas)
HD 283572	J0429+2724	2.0	2020.01547	65.495256413	0.033	28.301662253	0.072
V410 Tau	J0429+2724	2.7	2020.01546	64.629671673	0.059	28.454348213	0.126
SS Cyg	J2136+4301	1.3	2020.01451	325.679208442	0.071	43.586257890	0.112
Brun 334	J0529-0519	1.2	2020.01560	83.665661454	0.055	−5.407113858	0.134
TYC 5346-538-1	J0542-0913	1.1	2020.01561	85.640320721	0.101	−8.120884576	0.248
Haro 1-6	J1633-2557	2.3	2020.01429	246.512495679	0.055	−24.393536459	0.148
CoKu HP Tau G2	J0438+2153	1.2	2020.01549	68.975719883	0.061	22.903662815	0.134
BH CVn	J1324+3622	2.1	2020.01370	203.699807328	0.020	37.18235859	0.050
BH CVn	J1340+3754	1.3	2020.01370	203.699807118	0.019	37.18235822	0.046
σ² CrB	J1613+3412	0.4	2020.01416	243.668436110	0.018	33.85812083	0.031
HD 199178	J2102+4702	3.0	2020.01452	313.473754649	0.019	44.38640432	0.037
AR Lac	J2153+4322	3.5	2020.01460	332.169653348	0.029	45.74250851	0.046
IM Peg	J2253+1608	0.7	2020.01469	343.259318422	0.019	16.84104056	0.041
HD 22468	J0339-0146	2.5	2020.01545	54.196857495	0.016	0.58685785	0.038
del Lib	J1456-0617	2.1	2020.01405	225.242763738	0.037	−8.51898195	0.082

Notes. Star coordinates at epoch t are denoted α(t) and δ(t), and their uncertainties σ_α*,random and σ_δ,random. The spatial distance between star and phase calibrator is ∆_c.

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