A celestial reference frame derived from observations with the Very Long Baseline Interferometry Global Observing System

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Table 2

Basic characteristics of VIE2023-VG CRF provided for different groups of sources.

Parameter	All sources	ICRF3 defining	VIE2023-VG CRF defining
No. of sources	418	178	71
Raw formal error α*	30 μas	23 μas	7 μas
Raw formal error δ	47 μas	41 μas	17 μas
Correlation coeff. between α and δ	0.34	0.39	0.35
Semi-major axis of error ellipse	50 μas	44 μas	18 μas
Semi-minor axis of error ellipse	27 μas	21 μas	6 μas

Notes. Statistics are computed for the entire catalog of all 418 sources, for all observed ICRF3 defining sources, and for ICRF3 defining sources with more than 1000 observations in VIE2023-VG CRF which were used for datum definition. The reported stochastic characteristics are median values.

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