BULLETIN B 451 3 September 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 0.035 0.027 0.0450 0.080 0.013 2025 7 2 60858 163.726 439.709 43.8862 0.355 -0.031 0.032 0.027 0.0188 0.011 0.007 2025 7 3 60859 165.129 439.212 44.3592 0.381 -0.063 0.032 0.027 0.0191 0.012 0.007 2025 7 4 60860 166.750 439.040 44.9311 0.407 -0.106 0.032 0.027 0.0192 0.012 0.008 2025 7 5 60861 167.817 438.664 45.6628 0.415 -0.137 0.032 0.027 0.0171 0.012 0.007 2025 7 6 60862 169.272 437.908 46.6102 0.412 -0.160 0.033 0.027 0.0163 0.012 0.007 2025 7 7 60863 171.159 437.828 47.7786 0.402 -0.178 0.033 0.028 0.0169 0.011 0.007 2025 7 8 60864 173.388 438.077 49.0784 0.389 -0.190 0.033 0.027 0.0175 0.011 0.007 2025 7 9 60865 175.400 438.263 50.4334 0.373 -0.185 0.034 0.028 0.0178 0.011 0.007 2025 7 10 60866 176.474 437.976 51.7919 0.356 -0.177 0.035 0.028 0.0182 0.011 0.007 2025 7 11 60867 177.712 437.377 53.0803 0.341 -0.174 0.035 0.028 0.0182 0.011 0.007 2025 7 12 60868 178.633 437.065 54.2033 0.334 -0.210 0.036 0.028 0.0184 0.011 0.007 2025 7 13 60869 179.933 436.462 55.0441 0.333 -0.264 0.037 0.027 0.0189 0.011 0.007 2025 7 14 60870 181.817 436.225 55.5396 0.333 -0.313 0.038 0.027 0.0190 0.011 0.007 2025 7 15 60871 184.057 435.778 55.7868 0.331 -0.344 0.038 0.027 0.0187 0.011 0.007 2025 7 16 60872 186.761 435.550 55.8904 0.321 -0.306 0.036 0.028 0.0189 0.011 0.007 2025 7 17 60873 188.850 435.426 55.9596 0.309 -0.241 0.036 0.028 0.0193 0.012 0.007 2025 7 18 60874 190.673 435.068 56.0917 0.299 -0.175 0.037 0.029 0.0191 0.012 0.007 2025 7 19 60875 191.955 434.773 56.3697 0.304 -0.162 0.037 0.029 0.0185 0.013 0.007 2025 7 20 60876 192.901 433.988 56.8361 0.318 -0.180 0.037 0.029 0.0178 0.014 0.007 2025 7 21 60877 193.927 433.607 57.5139 0.332 -0.202 0.037 0.029 0.0175 0.015 0.007 2025 7 22 60878 194.948 433.233 58.3746 0.340 -0.217 0.037 0.028 0.0178 0.016 0.007 2025 7 23 60879 196.000 432.956 59.2753 0.327 -0.177 0.037 0.028 0.0230 0.021 0.008 2025 7 24 60880 197.179 432.624 60.0546 0.306 -0.121 0.037 0.028 0.0262 0.028 0.008 2025 7 25 60881 198.548 432.331 60.6568 0.284 -0.073 0.037 0.027 0.0298 0.035 0.009 2025 7 26 60882 199.690 431.711 61.0672 0.273 -0.081 0.037 0.027 0.0354 0.056 0.011 2025 7 27 60883 200.648 430.927 61.3030 0.269 -0.124 0.036 0.028 0.0458 0.099 0.015 2025 7 28 60884 202.046 430.286 61.4255 0.271 -0.176 0.036 0.028 0.0618 0.148 0.020 2025 7 29 60885 203.972 429.782 61.4726 0.276 -0.222 0.037 0.028 0.0918 0.182 0.023 2025 7 30 60886 206.161 429.032 61.5429 0.283 -0.226 0.036 0.028 0.1436 0.330 0.037 2025 7 31 60887 208.232 427.955 61.7487 0.293 -0.211 0.036 0.028 0.2268 0.569 0.060 2025 8 1 60888 210.247 427.160 62.1491 0.303 -0.188 0.036 0.027 0.3296 0.780 0.081 Preliminary extension 2025 8 2 60889 211.837 426.325 62.7846 0.315 -0.160 0.037 0.028 0.3103 0.742 0.085 2025 8 3 60890 213.082 424.972 63.6806 0.328 -0.133 0.037 0.029 0.2347 0.571 0.085 2025 8 4 60891 213.731 423.820 64.7959 0.339 -0.113 0.037 0.029 0.1956 0.380 0.085 2025 8 5 60892 213.971 422.738 66.0502 0.348 -0.105 0.034 0.027 0.1704 0.245 0.085 2025 8 6 60893 214.417 421.474 67.3722 0.352 -0.133 0.031 0.025 0.1444 0.220 0.093 2025 8 7 60894 214.871 420.364 68.6573 0.352 -0.176 0.030 0.024 0.1272 0.210 0.107 2025 8 8 60895 215.245 419.016 69.8244 0.349 -0.220 0.029 0.024 0.1175 0.202 0.120 2025 8 9 60896 215.639 417.688 70.7671 0.342 -0.243 0.029 0.024 0.0925 0.184 0.115 2025 8 10 60897 216.146 416.428 71.4413 0.332 -0.250 0.029 0.024 0.0694 0.151 0.099 2025 8 11 60898 217.278 415.092 71.8324 0.324 -0.251 0.029 0.024 0.0592 0.117 0.082 2025 8 12 60899 218.421 414.070 72.0018 0.320 -0.246 0.029 0.024 0.0523 0.093 0.071 2025 8 13 60900 218.726 413.123 72.0655 0.326 -0.242 0.029 0.024 0.0411 0.093 0.078 2025 8 14 60901 218.956 412.187 72.1561 0.336 -0.235 0.029 0.024 0.0317 0.097 0.089 2025 8 15 60902 219.600 411.060 72.3939 0.429 -0.227 0.029 0.024 0.0278 0.105 0.101 2025 8 16 60903 220.591 409.970 72.8618 0.560 -0.214 0.030 0.025 0.0242 0.119 0.119 2025 8 17 60904 221.389 408.960 73.6110 0.650 -0.191 0.031 0.026 0.0223 0.135 0.139 2025 8 18 60905 222.277 407.509 74.5584 0.643 -0.154 0.033 0.028 0.0211 0.145 0.152 2025 8 19 60906 223.318 406.067 75.6411 0.481 -0.098 0.034 0.029 0.0203 0.150 0.159 2025 8 20 60907 224.514 404.434 76.7736 0.342 -0.181 0.034 0.030 0.0202 0.500 0.500 2025 8 21 60908 225.922 403.074 77.7857 0.349 -0.186 0.035 0.031 0.0203 0.500 0.500 2025 8 22 60909 226.896 401.876 78.6210 0.352 -0.181 0.035 0.031 0.0210 0.500 0.500 2025 8 23 60910 227.906 400.305 79.3277 0.348 -0.167 0.035 0.031 0.0223 0.500 0.500 2025 8 24 60911 229.149 398.960 79.8800 0.340 -0.149 0.036 0.031 0.0238 0.500 0.500 2025 8 25 60912 230.052 397.620 80.3189 0.328 -0.130 0.037 0.031 0.0258 0.500 0.500 2025 8 26 60913 230.708 396.542 80.6807 0.320 -0.113 0.038 0.032 0.0288 0.500 0.500 2025 8 27 60914 230.986 395.667 81.0478 0.317 -0.099 0.040 0.032 0.0337 0.500 0.500 2025 8 28 60915 231.162 394.514 81.4775 0.322 -0.087 0.042 0.034 0.0404 0.500 0.500 2025 8 29 60916 231.499 393.396 82.0266 0.331 -0.078 0.045 0.035 0.0468 0.500 0.500 2025 8 30 60917 232.132 392.187 82.7355 0.342 -0.075 0.050 0.038 0.0534 0.500 0.500 2025 8 31 60918 232.880 391.234 83.6067 0.351 -0.079 0.057 0.043 0.0591 0.500 0.500 2025 9 1 60919 233.579 390.298 84.6086 0.355 -0.093 0.069 0.051 0.0659 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 7 2 60858 -115.889 -10.404 0.028 0.007 2025 7 3 60859 -116.061 -10.566 0.029 0.007 2025 7 4 60860 -116.006 -10.701 0.030 0.008 2025 7 5 60861 -115.993 -10.734 0.029 0.007 2025 7 6 60862 -116.108 -10.767 0.029 0.007 2025 7 7 60863 -116.316 -10.914 0.028 0.007 2025 7 8 60864 -116.572 -11.134 0.028 0.007 2025 7 9 60865 -116.826 -11.253 0.028 0.007 2025 7 10 60866 -117.007 -11.168 0.028 0.007 2025 7 11 60867 -117.070 -10.939 0.029 0.007 2025 7 12 60868 -117.053 -10.760 0.029 0.007 2025 7 13 60869 -117.077 -10.727 0.028 0.007 2025 7 14 60870 -117.201 -10.811 0.028 0.007 2025 7 15 60871 -117.387 -10.909 0.028 0.007 2025 7 16 60872 -117.608 -10.891 0.029 0.007 2025 7 17 60873 -117.856 -10.790 0.029 0.007 2025 7 18 60874 -118.141 -10.670 0.030 0.007 2025 7 19 60875 -118.393 -10.642 0.032 0.007 2025 7 20 60876 -118.547 -10.720 0.035 0.007 2025 7 21 60877 -118.585 -10.869 0.038 0.007 2025 7 22 60878 -118.569 -11.013 0.040 0.007 2025 7 23 60879 -118.608 -11.039 0.052 0.008 2025 7 24 60880 -118.651 -10.958 0.070 0.008 2025 7 25 60881 -118.610 -10.804 0.087 0.009 2025 7 26 60882 -118.489 -10.641 0.141 0.011 2025 7 27 60883 -118.489 -10.482 0.250 0.015 2025 7 28 60884 -118.804 -10.390 0.371 0.020 2025 7 29 60885 -119.399 -10.442 0.457 0.023 2025 7 30 60886 -120.013 -10.600 0.830 0.037 2025 7 31 60887 -120.385 -10.762 1.429 0.060 2025 8 1 60888 -120.458 -10.804 1.961 0.081 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 7 2 60858 -0.4512 0.0108 15.04106725722 0.00000000188 2025 7 3 60859 -0.5089 0.0110 15.04106726726 0.00000000191 2025 7 4 60860 -0.6464 0.0116 15.04106729120 0.00000000202 2025 7 5 60861 -0.8349 0.0112 15.04106732402 0.00000000195 2025 7 6 60862 -1.0605 0.0114 15.04106736329 0.00000000198 2025 7 7 60863 -1.2520 0.0120 15.04106739663 0.00000000209 2025 7 8 60864 -1.3421 0.0119 15.04106741231 0.00000000207 2025 7 9 60865 -1.3684 0.0114 15.04106741689 0.00000000198 2025 7 10 60866 -1.3367 0.0125 15.04106741137 0.00000000218 2025 7 11 60867 -1.2211 0.0125 15.04106739125 0.00000000218 2025 7 12 60868 -0.9981 0.0118 15.04106735243 0.00000000205 2025 7 13 60869 -0.6733 0.0119 15.04106729588 0.00000000207 2025 7 14 60870 -0.3504 0.0119 15.04106723967 0.00000000207 2025 7 15 60871 -0.1574 0.0128 15.04106720607 0.00000000223 2025 7 16 60872 -0.0664 0.0122 15.04106719023 0.00000000212 2025 7 17 60873 -0.0847 0.0129 15.04106719342 0.00000000225 2025 7 18 60874 -0.1956 0.0158 15.04106721272 0.00000000275 2025 7 19 60875 -0.3700 0.0141 15.04106724308 0.00000000245 2025 7 20 60876 -0.5752 0.0143 15.04106727880 0.00000000249 2025 7 21 60877 -0.7804 0.0137 15.04106731453 0.00000000238 2025 7 22 60878 -0.9089 0.0132 15.04106733690 0.00000000230 2025 7 23 60879 -0.8661 0.0121 15.04106732945 0.00000000211 2025 7 24 60880 -0.6941 0.0119 15.04106729950 0.00000000207 2025 7 25 60881 -0.5020 0.0123 15.04106726606 0.00000000214 2025 7 26 60882 -0.3152 0.0117 15.04106723354 0.00000000204 2025 7 27 60883 -0.1657 0.0123 15.04106720752 0.00000000214 2025 7 28 60884 -0.0784 0.0126 15.04106719232 0.00000000219 2025 7 29 60885 -0.0434 0.0127 15.04106718623 0.00000000221 2025 7 30 60886 -0.1232 0.0117 15.04106720012 0.00000000204 2025 7 31 60887 -0.2948 0.0117 15.04106722999 0.00000000204 2025 8 1 60888 -0.5134 0.0119 15.04106726805 0.00000000207 4 - INFORMATION ON TIME SCALES TAI - UTC = 37 s. during period [60858-60888] No leap second introduced during period [60858-60888] 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 42 49 2 - 28 31 11 60860.27 to 60885.21 88 100 15 - 51 34 GSFC gsf2023a.eoxy 50 52 3 7 31 34 11 60860.27 to 60885.21 163 127 20 10 35 53 IAA iaa2021a.eops 71 74 4 - 64 64 11 60860.27 to 60885.21 86 231 21 - 77 59 USNO usn2025a.eoxy 34 39 2 - 35 39 8 60860.27 to 60885.21 103 103 17 - 21 24 OPA opa2025a.eops 104 108 8 - 83 172 3 60873.25 to 60885.21 3051 4877 123 - 44 180 IVS * ivs2023a.eoxy 38 65 3 - 23 25 8 60860.27 to 60885.21 89 106 18 - 2 9 VIE vie2023a.eopxy 172 221 14 - - - 16 60858.00 to 60888.00 244 469 13 - - - VIE vie2023a.eoxy - - - - 39 37 8 60860.27 to 60885.21 - - - - 50 75 VLBI Intensive GSI * gsiint2d.eopi - - 15 - - - 9 60861.33 to 60884.25 - - 37 - - - BKG * bkg2025a.eopi - - 9 - - - 62 60858.75 to 60887.75 - - 37 - - - GSFC * gsf2023a.eopi - - 11 - - - 97 60858.75 to 60887.75 - - 44 - - - IAA * iaa2021a.eopi - - 8 - - - 98 60858.75 to 60887.75 - - 36 - - - USNO * usn2025a.eopi - - 12 - - - 89 60858.75 to 60887.75 - - 39 - - - VIE vie2023a.eopi - - 8 - - - 83 60858.75 to 60887.75 - - 48 - - - DGFI dgf2024a.eopi - - 10 - - - 42 60858.75 to 60887.75 - - 36 - - - GPS CODE COD0OPSFIN 3 3 - 0 - - 30 60858.50 to 60887.50 34 24 - 11 - - JPL JPL0OPSFIN 4 4 - 3 - - 30 60858.50 to 60887.50 51 32 - 22 - - GFZ GFZ0OPSFIN 6 6 - 1 - - 30 60858.50 to 60887.50 37 29 - 12 - - ESA ESA0OPSFIN 4 5 - 1 - - 30 60858.50 to 60887.50 39 28 - 11 - - SIO SIO0OPSFIN 23 22 - 9 - - 30 60858.50 to 60887.50 46 38 - 14 - - EMR EMR0OPSRAP 3 2 - 0 - - 30 60858.50 to 60887.50 56 36 - 12 - - IAA gnss.res 0 0 - 0 - - 30 60858.50 to 60887.50 42 53 - 29 - - GRGS GRG0OPSFIN 269 269 - 0 - - 30 60858.50 to 60887.50 31 25 - 14 - - ASI asi*.erp 10 10 - 0 - - 15 60869.50 to 60885.50 18 19 - 83 - - MIT MIT0OPSFIN 10 10 - 1 - - 30 60858.50 to 60887.50 48 37 - 13 - - IGS * IGS0OPSRAP 8 7 - 2 - - 30 60858.50 to 60887.50 40 25 - 10 - - IGS * IGS0OPSFIN 7 6 - 2 - - 30 60858.50 to 60887.50 33 24 - 11 - - SLR MCC tg*.02 191 255 - 35 - - 31 60858.00 to 60888.00 125 212 - 258 - - IAA slr_v.dat 94 119 - 6 - - 29 60858.00 to 60887.00 312 460 - 46 - - ASI asi.*.eop 62 82 - 16 - - 30 60858.50 to 60887.50 192 204 - 47 - - ILRS * ilrsa.eop 44 55 - 10 - - 30 60858.50 to 60887.50 161 172 - 29 - - BULLETIN A NEOS mark3.out 19 20 13 - - - 31 60858.00 to 60888.00 34 41 25 - - - To unsubscribe : http://hpiers.obspm.fr/eop-pc/products/bulletins/bulletin_registration.html