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Table 2

Positions and proper motions of all features.

First Number of RA offset at Dec offset at Proper motion in Proper motion in LSR
epoch of detected first epoch first epoch RA Dec velocity
ID detection epochs (mas) (mas) (mas yr−1) (mas yr−1) (km s−1)
1 Feb. 23, 2017 7 −7.56 ± 0.17 −20.73 ± 0.19 −1.36 ± 0.38 −0.88 ± 0.58 1.62
2 Feb. 23, 2017 7 −3.84 ± 0.04 −1.15 ± 0.01 −0.09 ± 0.32 0.47 ± 0.21 2.41
3 Mar. 25, 2017 5 −10.03 ± 0.16 −23.96 ± 0.06 0.16 ± 0.49 −0.79 ± 0.29 3.04
4 Feb. 23, 2017 7 −10.85 ± 0.02 −30.90 ± 0.01 −3.23 ± 0.34 −1.61 ± 0.20 3.22
5 Feb. 25, 2017 3 −11.39 ± 0.02 −29.05 ± 0.03 −3.46 ± 1.54 −2.20 ± 1.03 3.67
6 May. 14, 2017 2 −11.71 ± 0.05 −27.08 ± 0.01 – – 3.90
7 Feb. 23, 2017 7 19.63 ± 0.03 −39.59 ± 0.01 2.61 ± 0.50 −0.67 ± 0.46 3.96
8 Mar. 25, 2017 2 230.30 ± 0.14 299.38 ± 0.08 – – 5.04
9 Feb. 23, 2017 4 14.06 ± 0.18 −45.21 ± 0.08 0.45 ± 0.37 −4.01 ± 0.33 5.08
10 Feb. 25, 2017 5 230.41 ± 0.02 284.59 ± 0.01 2.12 ± 0.25 −2.06 ± 0.15 5.37
11 Feb. 23, 2017 1 223.22 ± 0.08 281.29 ± 0.21 – – 6.42
12 Feb. 23, 2017 1 230.05 ± 0.22 314.61 ± 0.18 – – 6.41
13 Feb. 23, 2017 7 226.79 ± 0.06 299.80 ± 0.02 0.89 ± 0.16 0.04 ± 0.14 6.40
14 Apr. 19, 2017 1 223.56 ± 0.15 310.13 ± 0.24 – – 7.48
15 Feb. 23, 2017 7 222.00 ± 0.06 301.14 ± 0.03 −0.57 ± 0.52 0.40 ± 0.56 7.59
16 May. 14, 2017 2 182.18 ± 0.16 281.35 ± 0.19 – – 11.57
17 Apr. 21, 2017 3 71.39 ± 0.16 127.44 ± 0.53 0.20 ± 0.55 1.33 ± 2.37 12.45
18 Feb. 25, 2017 5 185.55 ± 0.28 280.16 ± 0.16 −0.15 ± 0.62 3.66 ± 0.66 13.62
19 Feb. 23, 2017 7 78.37 ± 0.17 143.48 ± 0.11 −1.06 ± 0.38 −0.13 ± 0.27 13.84
20 Apr. 19, 2017 3 186.66 ± 0.35 281.58 ± 0.35 0.22 ± 0.58 1.89 ± 0.86 14.33
21 Feb. 23, 2017 2 179.20 ± 0.07 279.93 ± 0.09 – – 14.88
22 Feb. 23, 2017 7 188.62 ± 0.06 281.72 ± 0.05 1.71 ± 0.21 4.37 ± 0.21 15.96
23 May. 14, 2017 1 46.76 ± 0.02 66.49 ± 0.04 – – 17.79
24 May. 14, 2017 1 48.43 ± 0.02 62.95 ± 0.03 – – 17.90
25 May. 14, 2017 1 103.95 ± 0.10 124.09 ± 0.13 – – 18.66

Notes. Feature 13 is the reference feature for fringe fitting and proper motion measurements. The absolute position is measured by phase-referencing analysis for feature 19. Proper motion is measured with respect to that of the barycenter. A proper motion of 1 mas yr−1 corresponds to 8.44 km s−1.

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