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		| Paper: | 
		Errors in high precision source position determination | 
	 
	
		| Volume: | 
		19, Radio Interferometry: Theory, Techniques, and Applications, IAU Colloquium 131 | 
	 
	
		| Page: | 
		307 | 
	 
	
		| Authors: | 
		Elosegui, Pedro; Marcaide, Juan-Maria; Shapiro, Irwin I. | 
	 
	
	
		| Abstract: | 
		A detailed analysis is made of the systematic errors in the determination, from two sets of VLBI observations, of the position of the QSO 1038 + 528 A relative to the QSO 1038 + 528 B. The analysis confirms an apparent proper motion at 3.6 cm of 26 +/- 8 micro-as/yr of the core of the QSO 1038 + 528 A relative to QSO 1038 + 528 B. | 
	 
	
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