VERA observations of SiO maser emission from R Aquarii

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Table 1:

Summary of VERA observations in R Aqr. We give the relative positions of the central star with respect to the J2000 Hipparcos coordinates (and their uncertainties at 2 $\sigma$ -level).
Date	Star's relative coordinates (mas)		Number of spots			Comments
	$\Delta$ (AR)	$\Delta$ (Dec)	v=1 J = 1-0	v=2 J = 1-0	coincident v=1,2
23 Dec. 2004	135.3 (4.2)	-133.1 (1.4)	7	41	1 (1)
27 Sep. 2005	161.4 (0.5)	-154.9 (0.8)	4	76	0 (0)
23 Nov. 2005	164.5 (0.3)	-160.7 (0.5)	79	77	3 (11)
24 Dec. 2005	166.4 (0.3)	-162.4 (0.6)	66	75	11 (16)
14 Feb. 2006	172.7 (0.3)	-165.2 (0.5)	116	157	0 (1)
04 Mar. 2006	175.1 (0.3)	-165.7 (0.5)	56	196	0 (5)
08 May 2006	-	-			-	no absolute astrometry
11 Jul. 2006	-	-			-	no absolute astrometry
26 Jul. 2006	-	-			-	no absolute astrometry
30 Aug. 2006	195.7 (1.0)	-181.5 (0.8)	24	31	0 (0)
13 Oct. 2006	196.6 (2.4)	-188.4 (1.0)	41	73	4 (6)	poor fitting

Notes. The spot coincidences have been estimated for spatial distances less than 1/3 (and than 2/3) of the beam.

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