BULLETIN B 452 1 October 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 0.028 0.0888 0.185 0.056 2025 8 2 60889 211.837 426.325 62.7846 0.314 -0.160 0.037 0.028 0.3103 0.742 0.085 2025 8 3 60890 213.082 424.972 63.6806 0.327 -0.133 0.037 0.029 0.2347 0.571 0.084 2025 8 4 60891 213.731 423.820 64.7959 0.338 -0.113 0.037 0.029 0.1956 0.380 0.084 2025 8 5 60892 213.971 422.741 66.0502 0.348 -0.105 0.036 0.029 0.1704 0.244 0.084 2025 8 6 60893 214.417 421.479 67.3740 0.352 -0.133 0.035 0.029 0.1455 0.219 0.092 2025 8 7 60894 214.882 420.363 68.6597 0.352 -0.176 0.035 0.029 0.1288 0.208 0.105 2025 8 8 60895 215.248 419.025 69.8264 0.349 -0.220 0.035 0.029 0.1199 0.199 0.117 2025 8 9 60896 215.642 417.693 70.7694 0.345 -0.252 0.036 0.030 0.0956 0.179 0.108 2025 8 10 60897 216.153 416.428 71.4433 0.339 -0.269 0.037 0.030 0.0727 0.140 0.086 2025 8 11 60898 217.287 415.093 71.8343 0.332 -0.270 0.036 0.029 0.0636 0.100 0.063 2025 8 12 60899 218.428 414.074 72.0043 0.322 -0.251 0.037 0.030 0.0589 0.072 0.047 2025 8 13 60900 218.721 413.132 72.0690 0.310 -0.198 0.037 0.029 0.0485 0.056 0.036 2025 8 14 60901 218.956 412.193 72.1574 0.299 -0.135 0.038 0.029 0.0376 0.039 0.025 2025 8 15 60902 219.608 411.059 72.3897 0.302 -0.103 0.036 0.028 0.0311 0.035 0.022 2025 8 16 60903 220.594 409.971 72.8616 0.316 -0.101 0.035 0.028 0.0275 0.035 0.022 2025 8 17 60904 221.399 408.962 73.6133 0.334 -0.113 0.034 0.028 0.0267 0.035 0.022 2025 8 18 60905 222.286 407.525 74.5609 0.350 -0.135 0.034 0.028 0.0294 0.035 0.023 2025 8 19 60906 223.322 406.070 75.6406 0.360 -0.159 0.033 0.028 0.0320 0.035 0.023 2025 8 20 60907 224.527 404.436 76.7694 0.350 -0.170 0.033 0.028 0.0333 0.034 0.021 2025 8 21 60908 225.930 403.074 77.7787 0.330 -0.177 0.034 0.028 0.0315 0.033 0.019 2025 8 22 60909 226.910 401.873 78.6262 0.305 -0.181 0.035 0.029 0.0312 0.032 0.017 2025 8 23 60910 227.929 400.310 79.3335 0.269 -0.184 0.034 0.028 0.0330 0.041 0.021 2025 8 24 60911 229.180 398.964 79.8892 0.230 -0.183 0.035 0.029 0.0426 0.060 0.029 2025 8 25 60912 230.071 397.634 80.3242 0.200 -0.177 0.036 0.029 0.0534 0.081 0.039 2025 8 26 60913 230.731 396.533 80.6914 0.185 -0.162 0.038 0.029 0.0694 0.096 0.046 2025 8 27 60914 230.993 395.692 81.0566 0.212 -0.132 0.039 0.028 0.0792 0.129 0.052 2025 8 28 60915 231.173 394.510 81.4925 0.260 -0.094 0.039 0.028 0.0857 0.179 0.061 2025 8 29 60916 231.520 393.391 82.0466 0.317 -0.049 0.037 0.027 0.0984 0.224 0.070 2025 8 30 60917 232.139 392.168 82.7590 0.383 0.017 0.036 0.027 0.1066 0.319 0.074 2025 8 31 60918 232.921 391.237 83.6324 0.447 0.087 0.036 0.027 0.1151 0.501 0.081 2025 9 1 60919 233.548 390.316 84.6346 0.495 0.140 0.035 0.027 0.1433 0.704 0.087 Preliminary extension 2025 9 2 60920 234.386 389.252 85.6699 0.516 0.162 0.032 0.025 0.1856 0.848 0.092 2025 9 3 60921 234.751 388.344 86.6630 0.461 0.095 0.030 0.024 0.1656 0.737 0.084 2025 9 4 60922 234.473 387.160 87.5632 0.376 -0.010 0.029 0.024 0.1226 0.521 0.070 2025 9 5 60923 233.908 385.869 88.2652 0.284 -0.121 0.029 0.024 0.0975 0.329 0.058 2025 9 6 60924 233.450 384.368 88.6895 0.226 -0.200 0.028 0.023 0.0836 0.334 0.070 2025 9 7 60925 233.265 382.788 88.8038 0.195 -0.250 0.028 0.023 0.0787 0.425 0.100 2025 9 8 60926 233.725 381.184 88.6291 0.178 -0.275 0.028 0.023 0.0877 0.525 0.134 2025 9 9 60927 234.554 379.665 88.2855 0.173 -0.271 0.028 0.023 0.0982 0.596 0.157 2025 9 10 60928 235.293 378.464 87.9228 0.180 -0.209 0.028 0.023 0.0764 0.510 0.149 2025 9 11 60929 236.154 377.115 87.6805 0.194 -0.126 0.028 0.023 0.0510 0.360 0.130 2025 9 12 60930 236.454 375.631 87.6306 0.213 -0.045 0.029 0.023 0.0403 0.234 0.115 2025 9 13 60931 236.268 373.848 87.8305 0.288 -0.046 0.029 0.023 0.0317 0.205 0.115 2025 9 14 60932 235.845 371.915 88.2950 0.363 -0.086 0.030 0.024 0.0278 0.198 0.120 2025 9 15 60933 235.270 370.030 88.9017 0.379 -0.114 0.031 0.026 0.0262 0.192 0.124 2025 9 16 60934 234.745 368.094 89.5422 0.295 -0.103 0.032 0.027 0.0246 0.188 0.127 2025 9 17 60935 234.348 366.289 90.0652 0.338 -0.118 0.033 0.028 0.0252 0.500 0.500 2025 9 18 60936 233.694 364.497 90.4060 0.343 -0.124 0.034 0.029 0.0269 0.500 0.500 2025 9 19 60937 233.094 362.804 90.5134 0.346 -0.123 0.035 0.029 0.0272 0.500 0.500 2025 9 20 60938 232.765 360.948 90.4384 0.344 -0.118 0.035 0.030 0.0273 0.500 0.500 2025 9 21 60939 232.353 359.310 90.1834 0.338 -0.110 0.036 0.030 0.0276 0.500 0.500 2025 9 22 60940 231.874 357.702 89.8950 0.331 -0.103 0.037 0.030 0.0278 0.500 0.500 2025 9 23 60941 231.557 356.037 89.7053 0.325 -0.096 0.039 0.031 0.0283 0.500 0.500 2025 9 24 60942 231.175 354.841 89.6615 0.323 -0.089 0.041 0.032 0.0292 0.500 0.500 2025 9 25 60943 230.580 353.374 89.7763 0.327 -0.079 0.044 0.034 0.0293 0.500 0.500 2025 9 26 60944 229.500 351.666 89.9998 0.336 -0.068 0.048 0.037 0.0310 0.500 0.500 2025 9 27 60945 228.004 349.548 90.3988 0.348 -0.059 0.054 0.041 0.0345 0.500 0.500 2025 9 28 60946 226.617 347.084 90.9776 0.360 -0.058 0.063 0.048 0.0387 0.500 0.500 2025 9 29 60947 225.910 345.005 91.6636 0.370 -0.069 0.077 0.059 0.0445 0.500 0.500 2025 9 30 60948 225.203 343.121 92.3826 0.377 -0.091 0.097 0.073 0.0526 0.500 0.500 2025 10 1 60949 224.561 341.164 93.0333 0.379 -0.119 0.130 0.096 0.0627 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 8 2 60889 -120.370 -10.721 1.866 0.085 2025 8 3 60890 -120.281 -10.640 1.435 0.084 2025 8 4 60891 -120.265 -10.676 0.955 0.084 2025 8 5 60892 -120.301 -10.813 0.614 0.084 2025 8 6 60893 -120.361 -10.955 0.550 0.092 2025 8 7 60894 -120.425 -10.986 0.524 0.105 2025 8 8 60895 -120.482 -10.911 0.502 0.117 2025 8 9 60896 -120.520 -10.803 0.450 0.108 2025 8 10 60897 -120.563 -10.725 0.353 0.086 2025 8 11 60898 -120.679 -10.695 0.251 0.063 2025 8 12 60899 -120.936 -10.698 0.181 0.047 2025 8 13 60900 -121.318 -10.705 0.141 0.036 2025 8 14 60901 -121.683 -10.716 0.098 0.025 2025 8 15 60902 -121.850 -10.740 0.088 0.022 2025 8 16 60903 -121.785 -10.756 0.088 0.022 2025 8 17 60904 -121.598 -10.760 0.088 0.022 2025 8 18 60905 -121.437 -10.775 0.088 0.023 2025 8 19 60906 -121.363 -10.824 0.088 0.023 2025 8 20 60907 -121.357 -10.883 0.086 0.021 2025 8 21 60908 -121.303 -10.905 0.083 0.019 2025 8 22 60909 -121.183 -10.814 0.080 0.017 2025 8 23 60910 -121.093 -10.577 0.103 0.021 2025 8 24 60911 -121.130 -10.268 0.151 0.029 2025 8 25 60912 -121.371 -10.051 0.204 0.039 2025 8 26 60913 -121.817 -10.051 0.242 0.046 2025 8 27 60914 -122.283 -10.230 0.324 0.052 2025 8 28 60915 -122.589 -10.421 0.451 0.061 2025 8 29 60916 -122.579 -10.477 0.563 0.070 2025 8 30 60917 -122.272 -10.395 0.802 0.074 2025 8 31 60918 -121.888 -10.328 1.259 0.081 2025 9 1 60919 -121.609 -10.384 1.769 0.087 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 8 2 60889 -0.7620 0.0117 15.04106731132 0.00000000204 2025 8 3 60890 -1.0157 0.0126 15.04106735549 0.00000000219 2025 8 4 60891 -1.2006 0.0135 15.04106738768 0.00000000235 2025 8 5 60892 -1.3015 0.0129 15.04106740524 0.00000000225 2025 8 6 60893 -1.3238 0.0122 15.04106740913 0.00000000212 2025 8 7 60894 -1.2401 0.0120 15.04106739455 0.00000000209 2025 8 8 60895 -1.0690 0.0119 15.04106736477 0.00000000207 2025 8 9 60896 -0.8130 0.0115 15.04106732020 0.00000000200 2025 8 10 60897 -0.5280 0.0117 15.04106727059 0.00000000204 2025 8 11 60898 -0.2675 0.0121 15.04106722524 0.00000000211 2025 8 12 60899 -0.0958 0.0121 15.04106719535 0.00000000211 2025 8 13 60900 -0.0553 0.0115 15.04106718830 0.00000000200 2025 8 14 60901 -0.1434 0.0116 15.04106720363 0.00000000202 2025 8 15 60902 -0.3413 0.0111 15.04106723809 0.00000000193 2025 8 16 60903 -0.6121 0.0113 15.04106728523 0.00000000197 2025 8 17 60904 -0.8701 0.0114 15.04106733014 0.00000000198 2025 8 18 60905 -1.0274 0.0115 15.04106735753 0.00000000200 2025 8 19 60906 -1.1174 0.0115 15.04106737319 0.00000000200 2025 8 20 60907 -1.0948 0.0113 15.04106736926 0.00000000197 2025 8 21 60908 -0.9304 0.0115 15.04106734064 0.00000000200 2025 8 22 60909 -0.7691 0.0116 15.04106731256 0.00000000202 2025 8 23 60910 -0.6280 0.0111 15.04106728800 0.00000000193 2025 8 24 60911 -0.4848 0.0112 15.04106726307 0.00000000195 2025 8 25 60912 -0.3926 0.0112 15.04106724702 0.00000000195 2025 8 26 60913 -0.3565 0.0115 15.04106724073 0.00000000200 2025 8 27 60914 -0.3903 0.0113 15.04106724662 0.00000000197 2025 8 28 60915 -0.4888 0.0117 15.04106726376 0.00000000204 2025 8 29 60916 -0.6295 0.0122 15.04106728826 0.00000000212 2025 8 30 60917 -0.7953 0.0120 15.04106731712 0.00000000209 2025 8 31 60918 -0.9454 0.0126 15.04106734325 0.00000000219 2025 9 1 60919 -1.0356 0.0128 15.04106735895 0.00000000223 4 - INFORMATION ON TIME SCALES TAI - UTC = 37 s. during period [60889-60919] No leap second introduced during period [60889-60919] 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 49 2 - 29 30 11 60892.21 to 60916.27 67 108 24 - 34 53 GSFC gsf2023a.eoxy 49 53 3 8 32 32 11 60892.21 to 60916.27 138 203 29 7 32 31 IAA iaa2021a.eops 60 73 4 - 60 57 7 60892.21 to 60916.27 108 115 26 - 84 33 USNO usn2025a.eoxy 35 45 2 - 40 41 8 60892.21 to 60916.27 51 68 24 - 24 85 OPA opa2025a.eops 465 274 12 - 66 103 10 60892.21 to 60916.27 2467 3243 343 - 229 246 IVS * ivs2023a.eoxy 542 873 52 - 376 399 8 60892.21 to 60916.27 106 100 23 - 2 4 VIE vie2023a.eopxy 341 512 38 - - - 20 60889.00 to 60917.00 683 2069 21 - - - VIE vie2023a.eoxy - - - - 40 34 11 60892.21 to 60916.27 - - - - 34 58 VLBI Intensive GSI * gsiint2d.eopi - - 16 - - - 8 60889.33 to 60918.33 - - 33 - - - BKG * bkg2025a.eopi - - 9 - - - 57 60889.33 to 60918.50 - - 36 - - - GSFC * gsf2023a.eopi - - 11 - - - 90 60889.33 to 60918.50 - - 67 - - - IAA * iaa2021a.eopi - - 8 - - - 71 60889.33 to 60912.75 - - 329 - - - USNO * usn2025a.eopi - - 14 - - - 82 60889.33 to 60918.50 - - 41 - - - VIE vie2023a.eopi - - 7 - - - 76 60889.33 to 60918.50 - - 92 - - - DGFI dgf2024a.eopi - - 9 - - - 38 60889.00 to 60918.33 - - 82 - - - GPS CODE COD0OPSFIN 3 3 - 0 - - 30 60889.50 to 60918.50 34 15 - 12 - - JPL JPL0OPSFIN 4 4 - 3 - - 30 60889.50 to 60918.50 41 21 - 16 - - GFZ GFZ0OPSFIN 7 6 - 1 - - 30 60889.50 to 60918.50 38 24 - 11 - - ESA ESA0OPSFIN 5 5 - 1 - - 30 60889.50 to 60918.50 31 24 - 9 - - SIO SIO0OPSFIN 24 22 - 10 - - 30 60889.50 to 60918.50 46 28 - 15 - - EMR EMR0OPSRAP 3 2 - 0 - - 30 60889.50 to 60918.50 41 35 - 13 - - IAA gnss.res 0 0 - 0 - - 28 60889.50 to 60918.50 68 60 - 18 - - GRGS GRG0OPSFIN 266 266 - 0 - - 30 60889.50 to 60918.50 27 20 - 11 - - ASI asi*.erp 10 10 - 0 - - 21 60890.50 to 60917.50 20 22 - 58 - - MIT MIT0OPSFIN 10 10 - 1 - - 30 60889.50 to 60918.50 47 26 - 12 - - IGS * IGS0OPSRAP 8 9 - 2 - - 30 60889.50 to 60918.50 30 22 - 10 - - IGS * IGS0OPSFIN 7 6 - 1 - - 30 60889.50 to 60918.50 27 17 - 11 - - SLR MCC tg*.02 178 222 - 33 - - 31 60889.00 to 60919.00 132 221 - 250 - - IAA slr_v.dat 88 140 - 6 - - 25 60890.00 to 60919.00 274 265 - 32 - - ASI asi.*.eop 54 72 - 15 - - 30 60889.50 to 60918.50 228 266 - 52 - - ILRS * ilrsa.eop 35 46 - 8 - - 30 60889.50 to 60918.50 119 175 - 29 - - BULLETIN A NEOS mark3.out 13 14 12 - - - 31 60889.00 to 60919.00 25 31 15 - - - To unsubscribe : http://hpiers.obspm.fr/eop-pc/products/bulletins/bulletin_registration.html