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

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Table 4

Weighted standard deviation (wstd, Cols. 2–5) and weighted Allan deviation (wadev, Cols. 6–9) of position estimates in α* and δ, with the difference of weighted mean (Δw.mean, VGOS minus SX sessions) in α* and δ (Cols. 10–11).

	wstd_SX		wstd_VGOS		wadev_SX		wadev_VGOS		Δw.mean
Source	α*	δ	α*	δ	α*	δ	α*	δ	α*	δ
0119+115	221	560	366	757	198	404	221	506	185	25
0229+131	325	200	264	435	260	206	268	411	616	−18
NRAO150	285	593	96	716	499	489	101	572	−50	−648
0642+449	152	115	430	82	133	116	182	68	−249	−89

Notes. The wstd, wadev, and the weighted mean are computed for four outlier sources from available S/X and VGOS sessions (including more than 20 observations to the given source) between 2019.0 and 2024.0. The units are μas.

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