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Table C.1

Proxima’s measurements used in our work.

ID Epoch [Julian Date] xc [pixel] σxc${\sigma _{{x_{\rm{c}}}}}$ [pixel] yc [pixel] σyc${\sigma _{{y_{\rm{c}}}}}$ [pixel] m Filter QFIT α [deg] σα [mas] δ [deg] σdelta [mas]
01 2459804.75467 1926.2235 0.0338 3286.1748 0.0352 −13.057 F467M 0.022 217.376747371 1.351 −62.674587667 1.407
02 2459632.39110 2264.7612 0.0332 1247.9268 0.0320 −13.059 F467M 0.028 217.378668158 1.327 −62.674865292 1.282
03 2459632.47387 2486.6214 0.0352 1438.5702 0.0340 −13.067 F467M 0.028 217.378667999 1.409 −62.674865318 1.361
04 2460024.85196 2385.5600 0.0314 1421.2092 0.0319 −13.065 F467M 0.021 217.376087566 1.255 −62.674683086 1.277
05 2460172.73301 1800.7917 0.0318 3118.5070 0.0321 −13.114 F467M 0.031 217.374444829 1.272 −62.674365571 1.283
06 2460172.7675 3 2022.4289 0.0319 3309.6327 0.0314 −13.115 F467M 0.027 217.374444218 1.275 −62.674365520 1.257
07 2460358.36622 2062.9079 0.0326 1234.5178 0.0345 −13.040 F467M 0.019 217.374128875 1.304 −62.674429629 1.378
08 2460358.40075 2284.9303 0.0315 1425.4628 0.0300 −13.039 F467M 0.029 217.374128667 1.261 −62.674429719 1.200
09 2460504.43855 1947.3915 0.0293 3111.0133 0.0299 −13.093 F467M 0.024 217.372376013 1.171 −62.674260916 1.196
10 2460504.47009 2168.2866 0.0308 3302.0919 0.0316 −13.086 F467M 0.033 217.372376032 1.231 −62.674260733 1.263
11 2460725.51673 1970.8004 0.0332 1189.9705 0.0330 −13.111 F467M 0.031 217.371822580 1.327 −62.674218487 1.322
12 2460725.54827 2191.9636 0.0323 1380.8853 0.0326 −13.123 F467M 0.021 217.371821662 1.291 −62.674218800 1.303
13 2456948.47274 1050.4672 0.0271 1190.2116 0.0269 −13.557 F555W 0.056 217.394963223 1.085 −62.676168291 1.075
14 2456948.48598 949.4063 0.0289 1089.8855 0.0292 −13.536 F555W 0.053 217.394962603 1.157 −62.676168495 1.166
15 2456948.49706 788.7839 0.0341 1191.0784 0.0346 −13.551 F555W 0.056 217.394963344 1.364 −62.676168466 1.385
16 2456948.50370 788.8014 0.0335 1191.0997 0.0342 −13.547 F555W 0.054 217.394963371 1.341 −62.676168476 1.369
17 2456749.02448 1162.0323 0.0335 1258.4659 0.0324 −13.589 F555W 0.054 217.396538553 1.340 −62.676610051 1.297
18 2456749.03111 1161.1490 0.0315 1057.3359 0.0312 −13.556 F555W 0.059 217.396539275 1.261 −62.676610395 1.247
19 2456749.04218 1035.8800 0.0264 1158.2595 0.0256 −13.582 F555W 0.066 217.396539564 1.057 −62.676610018 1.023
20 2457128.81620 971.4732 0.0398 1203.8484 0.0370 −13.614 F555W 0.051 217.394057801 1.594 −62.676392068 1.480
21 2457128.82282 971.1185 0.0276 1088.1644 0.0273 −13.622 F555W 0.044 217.394057503 1.105 −62.676392077 1.094
22 2457128.82890 1081.6568 0.0278 1052.5601 0.0289 −13.582 F555W 0.061 217.394057900 1.113 −62.676392205 1.155
23 2457238.36896 1031.7854 0.0311 1154.1121 0.0307 −13.581 F555W 0.053 217.392817136 1.244 −62.676113427 1.226
24 2457238.37558 1132.2106 0.0344 1153.7219 0.0350 −13.615 F555W 0.049 217.392816996 1.374 −62.676113579 1.400
25 2457238.38220 1062.2426 0.0210 1249.5657 0.0208 −13.591 F555W 0.059 217.392816489 0.841 −62.676113617 0.831
26 2457238.38883 951.6326 0.0287 1212.2432 0.0291 −13.568 F555W 0.059 217.392816007 1.147 −62.676113547 1.164
27 2457238.39545 951.1152 0.0316 1096.5853 0.0323 −13.567 F555W 0.055 217.392815855 1.264 −62.676113501 1.290
28 2457238.40153 1061.5841 0.0341 1061.0509 0.0326 −13.561 F555W 0.052 217.392817084 1.365 −62.676113205 1.303
29 2458120.16967 950.3832 0.0291 968.7748 0.0293 −13.580 F555W 0.049 217.388121548 1.163 −62.675610140 1.173
30 2458120.17629 1050.0150 0.0291 968.5612 0.0282 −13.579 F555W 0.053 217.388121423 1.162 −62.675610305 1.129
31 2458120.18291 981.1098 0.0295 1063.1812 0.0300 −13.576 F555W 0.054 217.388121310 1.178 −62.675610317 1.198
32 2458120.18953 870.2524 0.0290 1027.2180 0.0308 −13.567 F555W 0.065 217.388121609 1.162 −62.675610342 1.231
33 2458120.19616 869.8791 0.0306 911.4132 0.0304 −13.573 F555W 0.063 217.388121165 1.223 −62.675610106 1.217
34 2458120.20278 980.3003 0.0315 873.1229 0.0307 −13.566 F555W 0.064 217.388121330 1.259 −62.675610364 1.227
35 2457439.17114 1090.4346 0.0324 1156.1086 0.0309 −13.535 F555W 0.058 217.392412415 1.297 −62.676143506 1.235
36 2457439.19546 829.0430 0.0290 1157.1928 0.0291 −13.531 F555W 0.070 217.392412132 1.162 −62.676144078 1.162
37 2457439.20211 829.0055 0.0289 1157.3093 0.0291 −13.554 F555W 0.064 217.392412291 1.156 −62.676144024 1.163
38 2457546.97462 1032.8918 0.0302 1135.9872 0.0301 −13.543 F555W 0.048 217.391061298 1.209 −62.676082565 1.203
39 2457546.98570 872.2630 0.0291 1237.2087 0.0286 −13.686 F555W 0.062 217.391061082 1.162 −62.676082535 1.145
40 2457651.62777 1138.9173 0.0307 1185.5691 0.0308 −13.560 F555W 0.062 217.390377397 1.228 −62.675772426 1.233
41 2457651.64101 1169.7973 0.0295 1279.9915 0.0289 −13.575 F555W 0.062 217.390376915 1.181 −62.675772452 1.156
42 2457651.64763 1058.8164 0.0305 1243.8295 0.0312 −13.551 F555W 0.063 217.390376895 1.219 −62.675772244 1.247
43 2457651.65425 1058.3481 0.0296 1127.9507 0.0306 −13.537 F555W 0.065 217.390376776 1.185 −62.675772600 1.224
44 2457754.71986 909.7572 0.0290 1000.7889 0.0291 −13.552 F555W 0.042 217.390409935 1.159 −62.675823525 1.164
45 2458014.98180 1231.9042 0.0312 1198.2049 0.0303 −13.543 F555W 0.049 217.388091362 1.250 −62.675562392 1.214
46 2458015.00166 1151.7625 0.0333 1256.6533 0.0318 −13.533 F555W 0.056 217.388090579 1.331 −62.675562181 1.270
47 2458015.01490 1261.7607 0.0323 1102.7590 0.0322 −13.563 F555W 0.050 217.388090559 1.290 −62.675562552 1.287

Notes. ID is an arbitrary row index. Positions and corresponding errors are in WFC3/UVIS pixels. m is the instrumental magnitude (−2.5 log10 Flux).QFITis the quality of the PSF fit.

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