BULLETIN B 453 1 November 2025 Contents are described in https://hpiers.obspm.fr/iers/bul/bulb_new/bulletinb.pdf 1 - DAILY FINAL VALUES OF x, y, UT1-UTC, dX, dY Angular unit is milliarcsecond (mas), time unit is millisecond (ms). Upgraded solution from March 1 2017 - consistent with ITRF 2014. DATE MJD x y UT1-UTC dX dY x err y err UT1 err dX err dY err (0 h UTC) mas mas ms mas mas mas mas ms mas mas Final values Mean formal error 0.034 0.027 0.0809 0.306 0.058 2025 9 2 60920 234.395 389.247 85.6748 0.349 0.162 0.035 0.027 0.1872 2.106 0.092 2025 9 3 60921 234.752 388.348 86.6745 0.326 0.095 0.035 0.027 0.1690 1.791 0.084 2025 9 4 60922 234.475 387.155 87.5760 0.296 -0.010 0.035 0.028 0.1274 1.178 0.070 2025 9 5 60923 233.894 385.871 88.2826 0.267 -0.121 0.034 0.028 0.1043 0.635 0.058 2025 9 6 60924 233.459 384.364 88.7065 0.251 -0.199 0.034 0.028 0.0933 0.497 0.069 2025 9 7 60925 233.260 382.793 88.8232 0.245 -0.246 0.035 0.029 0.0922 0.439 0.100 2025 9 8 60926 233.736 381.181 88.6508 0.243 -0.271 0.036 0.029 0.1094 0.373 0.133 2025 9 9 60927 234.554 379.668 88.3071 0.242 -0.270 0.035 0.028 0.1409 0.326 0.158 2025 9 10 60928 235.299 378.468 87.9453 0.234 -0.222 0.034 0.028 0.1547 0.292 0.149 2025 9 11 60929 236.153 377.120 87.7056 0.226 -0.154 0.035 0.028 0.1598 0.247 0.129 2025 9 12 60930 236.459 375.635 87.6583 0.225 -0.085 0.036 0.027 0.1676 0.207 0.112 2025 9 13 60931 236.268 373.850 87.8620 0.249 -0.051 0.034 0.027 0.1307 0.180 0.098 2025 9 14 60932 235.856 371.918 88.3186 0.285 -0.040 0.033 0.027 0.0891 0.140 0.077 2025 9 15 60933 235.275 370.026 88.9293 0.324 -0.041 0.032 0.027 0.0729 0.096 0.053 2025 9 16 60934 234.755 368.087 89.5603 0.358 -0.048 0.032 0.027 0.0613 0.064 0.036 2025 9 17 60935 234.368 366.289 90.0845 0.368 -0.054 0.032 0.028 0.0559 0.063 0.035 2025 9 18 60936 233.698 364.510 90.4197 0.367 -0.059 0.032 0.028 0.0545 0.067 0.038 2025 9 19 60937 233.123 362.800 90.5323 0.360 -0.062 0.033 0.028 0.0550 0.070 0.040 2025 9 20 60938 232.755 360.949 90.4411 0.345 -0.046 0.034 0.028 0.0493 0.065 0.037 2025 9 21 60939 232.379 359.314 90.1830 0.327 -0.022 0.036 0.029 0.0402 0.052 0.029 2025 9 22 60940 231.874 357.700 89.9007 0.312 0.001 0.035 0.029 0.0333 0.037 0.021 2025 9 23 60941 231.570 356.046 89.7123 0.304 0.018 0.036 0.029 0.0286 0.027 0.015 2025 9 24 60942 231.195 354.846 89.6712 0.318 0.006 0.036 0.029 0.0273 0.027 0.015 2025 9 25 60943 230.597 353.388 89.7865 0.340 -0.016 0.036 0.029 0.0277 0.029 0.016 2025 9 26 60944 229.494 351.648 90.0199 0.365 -0.036 0.038 0.029 0.0294 0.030 0.016 2025 9 27 60945 228.025 349.564 90.4226 0.377 -0.020 0.037 0.029 0.0302 0.030 0.016 2025 9 28 60946 226.607 347.071 90.9921 0.382 0.013 0.037 0.029 0.0303 0.030 0.016 2025 9 29 60947 225.919 345.026 91.6715 0.383 0.042 0.038 0.028 0.0311 0.029 0.016 2025 9 30 60948 225.278 343.109 92.4092 0.384 0.058 0.037 0.027 0.0336 0.029 0.015 2025 10 1 60949 224.646 341.278 93.0425 0.394 0.015 0.035 0.027 0.0405 0.041 0.021 Preliminary extension 2025 10 2 60950 224.161 339.829 93.4700 0.402 -0.049 0.034 0.027 0.0518 0.061 0.031 2025 10 3 60951 223.112 338.270 93.6603 0.404 -0.110 0.031 0.025 0.0650 0.079 0.039 2025 10 4 60952 221.985 336.953 93.5828 0.380 -0.131 0.029 0.024 0.0622 0.077 0.039 2025 10 5 60953 220.938 335.787 93.2479 0.340 -0.123 0.029 0.023 0.0499 0.064 0.033 2025 10 6 60954 219.928 334.609 92.7492 0.298 -0.102 0.028 0.023 0.0417 0.050 0.028 2025 10 7 60955 218.433 333.137 92.2118 0.260 -0.070 0.028 0.023 0.0380 0.040 0.024 2025 10 8 60956 217.059 331.539 91.7598 0.246 -0.035 0.028 0.023 0.0394 0.051 0.032 2025 10 9 60957 215.410 330.504 91.5449 0.244 0.000 0.028 0.022 0.0442 0.071 0.047 2025 10 10 60958 213.332 329.292 91.6319 0.244 0.029 0.028 0.022 0.0501 0.089 0.060 2025 10 11 60959 211.530 328.140 92.0203 0.229 0.032 0.028 0.022 0.0493 0.108 0.082 2025 10 12 60960 210.178 327.123 92.6383 0.209 0.018 0.028 0.022 0.0438 0.138 0.120 2025 10 13 60961 208.831 326.406 93.3492 0.196 -0.004 0.028 0.022 0.0399 0.169 0.159 2025 10 14 60962 207.183 325.844 93.9964 0.197 -0.032 0.029 0.022 0.0349 0.189 0.184 2025 10 15 60963 205.343 325.099 94.4792 0.347 -0.088 0.029 0.022 0.0332 0.241 0.248 2025 10 16 60964 203.385 324.325 94.7472 0.463 -0.129 0.029 0.022 0.0330 0.302 0.322 2025 10 17 60965 201.560 323.752 94.7596 0.420 -0.120 0.030 0.023 0.0338 0.340 0.369 2025 10 18 60966 199.497 322.932 94.5882 0.354 -0.086 0.031 0.024 0.0354 0.500 0.500 2025 10 19 60967 197.967 322.343 94.3056 0.354 -0.083 0.033 0.025 0.0371 0.500 0.500 2025 10 20 60968 196.488 322.076 93.9807 0.352 -0.081 0.035 0.027 0.0403 0.500 0.500 2025 10 21 60969 194.972 322.036 93.6816 0.351 -0.081 0.036 0.029 0.0454 0.500 0.500 2025 10 22 60970 193.286 322.413 93.4802 0.350 -0.079 0.038 0.031 0.0442 0.500 0.500 2025 10 23 60971 191.613 322.580 93.3671 0.352 -0.074 0.039 0.032 0.0388 0.500 0.500 2025 10 24 60972 189.705 322.848 93.3699 0.358 -0.063 0.040 0.033 0.0342 0.500 0.500 2025 10 25 60973 187.868 322.763 93.5175 0.369 -0.051 0.042 0.034 0.0319 0.500 0.500 2025 10 26 60974 186.058 322.792 93.7680 0.382 -0.045 0.044 0.036 0.0319 0.500 0.500 2025 10 27 60975 184.447 322.418 94.0898 0.395 -0.050 0.048 0.040 0.0335 0.500 0.500 2025 10 28 60976 183.310 321.963 94.3736 0.406 -0.069 0.053 0.046 0.0359 0.500 0.500 2025 10 29 60977 182.086 321.710 94.4716 0.410 -0.096 0.062 0.056 0.0398 0.500 0.500 2025 10 30 60978 180.827 321.516 94.3231 0.407 -0.120 0.075 0.070 0.0445 0.500 0.500 2025 10 31 60979 179.204 320.932 93.8771 0.396 -0.134 0.094 0.091 0.0508 0.500 0.500 2025 11 1 60980 177.342 320.096 93.1248 0.380 -0.132 0.127 0.125 0.0620 0.500 0.500 2 - DAILY FINAL VALUES OF CELESTIAL POLE OFFSETS dPsi1980 & dEps1980 dPsi1980 dEps1980 ....dPsi,dEps / IAU 1980 precession-nutation model Description : ftp://hpiers.obspm.fr/iers/bul/bulb_new/bulletinb.pdf The Reference Systems are described in the 2006 IERS Annual Report. DATE MJD dPsi1980 dEps1980 sig dPsi sig dEps (0 h UTC) mas mas mas mas 2025 9 2 60920 -121.869 -10.515 5.293 0.092 2025 9 3 60921 -121.811 -10.652 4.503 0.084 2025 9 4 60922 -121.800 -10.706 2.962 0.070 2025 9 5 60923 -121.909 -10.714 1.596 0.058 2025 9 6 60924 -122.084 -10.694 1.250 0.069 2025 9 7 60925 -122.227 -10.635 1.103 0.100 2025 9 8 60926 -122.330 -10.531 0.937 0.133 2025 9 9 60927 -122.487 -10.453 0.820 0.158 2025 9 10 60928 -122.761 -10.454 0.735 0.149 2025 9 11 60929 -123.021 -10.516 0.621 0.129 2025 9 12 60930 -123.114 -10.533 0.521 0.112 2025 9 13 60931 -122.960 -10.488 0.453 0.098 2025 9 14 60932 -122.666 -10.424 0.353 0.077 2025 9 15 60933 -122.366 -10.399 0.241 0.053 2025 9 16 60934 -122.108 -10.423 0.162 0.036 2025 9 17 60935 -121.876 -10.457 0.157 0.035 2025 9 18 60936 -121.589 -10.450 0.168 0.038 2025 9 19 60937 -121.284 -10.336 0.177 0.040 2025 9 20 60938 -121.080 -10.057 0.163 0.037 2025 9 21 60939 -121.031 -9.675 0.130 0.029 2025 9 22 60940 -121.122 -9.369 0.094 0.021 2025 9 23 60941 -121.335 -9.320 0.068 0.015 2025 9 24 60942 -121.601 -9.569 0.067 0.015 2025 9 25 60943 -121.822 -9.922 0.072 0.016 2025 9 26 60944 -121.828 -10.164 0.076 0.016 2025 9 27 60945 -121.595 -10.232 0.076 0.016 2025 9 28 60946 -121.266 -10.270 0.075 0.016 2025 9 29 60947 -121.012 -10.383 0.074 0.016 2025 9 30 60948 -120.832 -10.498 0.073 0.015 2025 10 1 60949 -120.604 -10.516 0.103 0.021 3 - EARTH ANGULAR VELOCITY : DAILY FINAL VALUES OF LOD, OMEGA AT 0hUTC LOD : Excess of the Length of day - 86400 s TAI OMEGA : Earth angular velocity Description: ftp://hpiers.obspm.fr/iers/bul/bulb_new/bulletinb.pdf DATE MJD LOD sigma OMEGA sigma (0 h UTC) ms ms mas/ms mas/ms 2025 9 2 60920 -1.0302 0.0129 15.04106735801 0.00000000225 2025 9 3 60921 -0.9614 0.0124 15.04106734604 0.00000000216 2025 9 4 60922 -0.8184 0.0124 15.04106732114 0.00000000216 2025 9 5 60923 -0.5782 0.0124 15.04106727933 0.00000000216 2025 9 6 60924 -0.2693 0.0122 15.04106722555 0.00000000212 2025 9 7 60925 0.0352 0.0129 15.04106717254 0.00000000225 2025 9 8 60926 0.2845 0.0129 15.04106712914 0.00000000225 2025 9 9 60927 0.3796 0.0129 15.04106711259 0.00000000225 2025 9 10 60928 0.3221 0.0124 15.04106712260 0.00000000216 2025 9 11 60929 0.1478 0.0122 15.04106715294 0.00000000212 2025 9 12 60930 -0.0777 0.0132 15.04106719220 0.00000000230 2025 9 13 60931 -0.3383 0.0128 15.04106723756 0.00000000223 2025 9 14 60932 -0.5560 0.0135 15.04106727546 0.00000000235 2025 9 15 60933 -0.6455 0.0135 15.04106729104 0.00000000235 2025 9 16 60934 -0.5969 0.0130 15.04106728258 0.00000000226 2025 9 17 60935 -0.4394 0.0120 15.04106725516 0.00000000209 2025 9 18 60936 -0.2261 0.0124 15.04106721803 0.00000000216 2025 9 19 60937 -0.0024 0.0129 15.04106717909 0.00000000225 2025 9 20 60938 0.1841 0.0125 15.04106714662 0.00000000218 2025 9 21 60939 0.2944 0.0135 15.04106712742 0.00000000235 2025 9 22 60940 0.2537 0.0136 15.04106713450 0.00000000237 2025 9 23 60941 0.1216 0.0131 15.04106715750 0.00000000228 2025 9 24 60942 -0.0375 0.0122 15.04106718520 0.00000000212 2025 9 25 60943 -0.1840 0.0121 15.04106721070 0.00000000211 2025 9 26 60944 -0.3123 0.0120 15.04106723304 0.00000000209 2025 9 27 60945 -0.4892 0.0115 15.04106726383 0.00000000200 2025 9 28 60946 -0.6362 0.0119 15.04106728942 0.00000000207 2025 9 29 60947 -0.7171 0.0119 15.04106730351 0.00000000207 2025 9 30 60948 -0.7128 0.0121 15.04106730276 0.00000000211 2025 10 1 60949 -0.5456 0.0117 15.04106727365 0.00000000204 4 - INFORMATION ON TIME SCALES TAI - UTC = 37 s. during period [60920-60949] No leap second introduced during period [60920-60949] All information concerning time scales : - leap seconds announcements : Bulletin C - DUT1 announcements (UT1-UTC with 0.1 s accuracy) : Bulletin D can be found at : - web site : http://hpiers.obspm.fr/eop-pc/ - anonymous ftp://hpiers.obspm.fr/iers/ 5 - SUMMARY OF CONTRIBUTED EARTH ORIENTATION PARAMETERS SERIES This section gives the average precision of the individual series, some of them contributing to the combination (*) and their average agreement with it. The period covered is that one of Bulletin B. Units : micro-arc-seconds for x/y/dX/dY micro-seconds for UT1/LOD ----------------------------------------------------------------------------- EOP series first line : Mean formal uncertainty Periods covered second line : Weighted RMS agreement with Bulletin B ----------------------------------------------------------------------------- x y UT1 LOD dX dY Data Number VLBI Standards BKG bkg2025a.eoxy 41 48 2 - 31 30 10 60920.21 to 60948.21 116 175 30 - 126 56 GSFC gsf2023a.eoxy 48 51 3 7 32 32 11 60920.21 to 60948.21 203 159 31 9 79 36 IAA iaa2021a.eops 47 56 3 - 46 46 10 60920.21 to 60948.21 152 172 25 - 115 49 USNO usn2025a.eoxy 38 42 2 - 41 41 9 60920.21 to 60948.21 95 103 21 - 112 42 OPA opa2025a.eops 77 105 11 - 103 145 10 60920.21 to 60948.21 2314 3365 393 - 128 156 IVS * ivs2023a.eoxy 763 1150 82 - 442 447 9 60920.21 to 60948.21 164 162 11 - 8 7 VIE vie2023a.eopxy 170 236 9 - - - 19 60920.00 to 60949.00 307 571 29 - - - VIE vie2023a.eoxy - - - - 38 38 10 60920.21 to 60948.21 - - - - 94 83 VLBI Intensive GSI * gsiint2d.eopi - - 5 - - - 7 60924.33 to 60946.33 - - 27 - - - BKG * bkg2025a.eopi - - 9 - - - 65 60920.60 to 60948.75 - - 102 - - - GSFC * gsf2023a.eopi - - 10 - - - 84 60920.60 to 60948.75 - - 37 - - - USNO * usn2025a.eopi - - 13 - - - 77 60920.60 to 60948.75 - - 29 - - - VIE vie2023a.eopi - - 8 - - - 87 60920.60 to 60948.75 - - 54 - - - DGFI dgf2024a.eopi - - 10 - - - 31 60920.75 to 60948.75 - - 35 - - - GPS CODE COD0OPSFIN 3 3 - 0 - - 29 60920.50 to 60948.50 43 16 - 13 - - JPL JPL0OPSFIN 4 5 - 4 - - 29 60920.50 to 60948.50 47 27 - 15 - - GFZ GFZ0OPSFIN 5 5 - 1 - - 29 60920.50 to 60948.50 38 26 - 10 - - ESA ESA0OPSFIN 5 5 - 1 - - 29 60920.50 to 60948.50 39 27 - 9 - - SIO SIO0OPSFIN 24 22 - 11 - - 29 60920.50 to 60948.50 46 24 - 14 - - EMR EMR0OPSRAP 3 3 - 1 - - 29 60920.50 to 60948.50 45 29 - 13 - - IAA gnss.res 0 0 - 0 - - 28 60920.50 to 60948.50 75 60 - 18 - - GRGS GRG0OPSFIN 266 266 - 0 - - 29 60920.50 to 60948.50 33 21 - 12 - - ASI asi*.erp 11 10 - 0 - - 3 60946.50 to 60948.50 20 16 - 11 - - MIT MIT0OPSFIN 10 10 - 1 - - 29 60920.50 to 60948.50 49 29 - 15 - - IGS * IGS0OPSRAP 8 8 - 3 - - 29 60920.50 to 60948.50 40 21 - 10 - - IGS * IGS0OPSFIN 6 6 - 2 - - 29 60920.50 to 60948.50 30 17 - 11 - - SLR MCC tg*.02 208 235 - 40 - - 30 60920.00 to 60949.00 124 172 - 241 - - IAA slr_v.dat 112 151 - 8 - - 15 60920.00 to 60949.00 204 514 - 85 - - ASI asi.*.eop 62 86 - 18 - - 29 60920.50 to 60948.50 182 226 - 59 - - ILRS * ilrsa.eop 42 53 - 9 - - 29 60920.50 to 60948.50 138 222 - 34 - - BULLETIN A NEOS mark3.out 17 17 12 - - - 30 60920.00 to 60949.00 28 25 24 - - - To unsubscribe : http://hpiers.obspm.fr/eop-pc/products/bulletins/bulletin_registration.html